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Cheap flights from Seattle to Ontario from C$ 108

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 13/6. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
SEA — ONT
11 May — 18 May1
1 adult
Sat 11/5
Sat 18/5

The best prices from Seattle/Tacoma Intl to Ontario are usually found in September or October, booked 87 days in advance, depart on a Tuesday or Saturday and return on a Tuesday

Cheap flight deals from Seattle to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 6 May 2024.

Popular in

December

Cheapest in

September

Round-trip from

C$ 341

One-way from

C$ 239
High demand for flights, 21% potential price rise
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Best time to find cheap flights, 22% potential price drop
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From Seattle/Tacoma Intl to Ontario
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One-way flight from Seattle/Tacoma Intl to Ontario
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What is the cheapest day to fly round-trip from Seattle to Ontario?

Thursday flights are generally found to be more expensive for flights from Seattle to Ontario. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Ontario.

How far in advance should I book a flight from Seattle to Ontario?

To save on the cost of your flight from Seattle to Ontario, book at least 31 days before your planned departure. Booking around this time can save you about 82% on the cost of this flight compared to booking a flight leaving this week. We have found prices from C$ 375 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as C$ 528.

What is the cheapest month to fly from Seattle to Ontario?

September can be a great time to fly to Ontario from Seattle with a flight ticket averaging about C$ 310. Cheapflights users have found deals in the month of September for as cheap as C$ 94. The most expensive prices can be found in the month of March.

When is the cheapest time to fly from Seattle to Ontario (SEA - ONT)?

One of the essential ways to save on airfare from Seattle to Ontario is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight at noon could potentially save you up to 66% on airfare.

Cheap Alaska Airlines flights from Seattle to Ontario

Explore cheap flight options specifically provided by Alaska Airlines for the route between Seattle and Ontario. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 446,632 searches. Data last updated 6 May 2024.
Peruse some of the lowest-priced Alaska Airlines flights we've found from Seattle to Ontario. Come back soon if you're not finding the exact deal you're looking for.
Wed 12/66:32 a.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Wed 12/68:09 p.m.ONT - SEA
Nonstop2h 41mAlaska Airlines
Deal found 6/5C$ 215
Tue 4/69:26 p.m.SEA - ONT
Nonstop2h 32mAlaska Airlines
Tue 11/68:09 p.m.ONT - SEA
Nonstop2h 41mAlaska Airlines
Deal found 6/5C$ 229
Sat 25/56:32 a.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Sat 25/58:09 p.m.ONT - SEA
Nonstop2h 41mAlaska Airlines
Deal found 4/5C$ 242
Mon 1/79:26 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Tue 9/78:20 p.m.ONT - SEA
Nonstop2h 35mAlaska Airlines
Deal found 5/5C$ 256
Sat 1/66:32 a.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Sat 1/64:20 p.m.ONT - SEA
Nonstop2h 39mAlaska Airlines
Deal found 6/5C$ 263
Sat 22/66:30 a.m.SEA - ONT
Nonstop2h 35mAlaska Airlines
Wed 3/78:20 p.m.ONT - SEA
Nonstop2h 35mAlaska Airlines
Deal found 5/5C$ 276
Fri 14/66:30 a.m.SEA - ONT
Nonstop2h 35mAlaska Airlines
Mon 17/64:24 p.m.ONT - SEA
Nonstop2h 35mAlaska Airlines
Deal found 4/5C$ 297
Tue 18/66:30 a.m.SEA - ONT
Nonstop2h 35mAlaska Airlines
Thu 20/68:20 p.m.ONT - SEA
Nonstop2h 35mAlaska Airlines
Deal found 5/5C$ 339
Thu 27/66:30 a.m.SEA - ONT
Nonstop2h 35mAlaska Airlines
Thu 27/68:20 p.m.ONT - SEA
Nonstop2h 35mAlaska Airlines
Deal found 5/5C$ 365

Cheap Frontier flights from Seattle to Ontario

Explore cheap flight options specifically provided by Frontier for the route between Seattle and Ontario. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 446,632 searches. Data last updated 6 May 2024.
Some of the lowest-priced Frontier flights we've found at this time heading from Seattle to Ontario. Ensure the flight price, dates, time, and airline match your criteria before you book.
Thu 13/63:19 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 17/66:20 p.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 108
Mon 10/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 17/66:20 p.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 120
Thu 13/63:19 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 17/66:20 p.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 122
Mon 10/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Tue 18/69:54 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 130
Tue 28/51:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Sun 2/610:34 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 133
Mon 10/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 17/66:20 p.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 134
Thu 13/63:19 p.m.SEA - ONT
Nonstop2h 44mFrontier
Tue 18/69:54 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 135
Tue 11/61:47 p.m.SEA - ONT
Nonstop2h 44mFrontier
Wed 19/610:04 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 144
Mon 10/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Tue 18/69:54 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 148

Cheap Seattle to Ontario flights in May & June 2024

Find cheap flight options from Seattle to Ontario specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 446,632 searches. Prices were last updated on 6 May 2024.
Scroll through some of the best deals on flights from Seattle to Ontario in 2024. For more flight deals, be sure to check back very soon.
Thu 13/63:19 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 17/66:20 p.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 108
Mon 10/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 17/66:20 p.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 120
Thu 13/63:19 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 17/66:20 p.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 122
Mon 10/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Tue 18/69:54 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 130
Tue 28/51:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Sun 2/610:34 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 133
Mon 10/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 17/66:20 p.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 134
Thu 13/63:19 p.m.SEA - ONT
Nonstop2h 44mFrontier
Tue 18/69:54 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 135
Tue 11/61:47 p.m.SEA - ONT
Nonstop2h 44mFrontier
Wed 19/610:04 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 144
Mon 10/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Tue 18/69:54 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 148

Seattle to Ontario 2024 flight deals

Discover exclusive flight deals for travel between Seattle and Ontario in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 446,632 searches. Data last updated 6 May 2024.
Scroll through some of the best deals on flights from Seattle to Ontario in 2024. For more flight deals, be sure to check back very soon.
Thu 13/63:19 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 17/66:20 p.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 108
Mon 10/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 17/66:20 p.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 120
Thu 13/63:19 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 17/66:20 p.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 122
Mon 10/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Tue 18/69:54 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 130
Tue 28/51:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Sun 2/610:34 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 133
Mon 10/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 17/66:20 p.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 134
Thu 13/63:19 p.m.SEA - ONT
Nonstop2h 44mFrontier
Tue 18/69:54 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 135
Tue 11/61:47 p.m.SEA - ONT
Nonstop2h 44mFrontier
Wed 19/610:04 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 144
Mon 10/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Tue 18/69:54 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 148

Direct flights to Ontario from Seattle

Discover non-stop flight options from Seattle to Ontario. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 446,632 searches. Data last updated 6 May 2024.
Take a look at some of the direct flights travelling from Seattle to Ontario in the near future. Search for alternative flights from Seattle to Ontario by utilizing the search form above.
Thu 13/63:19 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 17/66:20 p.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 108
Mon 10/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 17/66:20 p.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 120
Thu 13/63:19 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 17/66:20 p.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 122
Mon 10/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Tue 18/69:54 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 130
Tue 28/51:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Sun 2/610:34 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 133
Mon 10/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 17/66:20 p.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 134
Thu 13/63:19 p.m.SEA - ONT
Nonstop2h 44mFrontier
Tue 18/69:54 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 135
Tue 11/61:47 p.m.SEA - ONT
Nonstop2h 44mFrontier
Wed 19/610:04 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 144
Mon 10/61:57 p.m.SEA - ONT
Nonstop2h 44mFrontier
Tue 18/69:54 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 148

Seattle to Ontario flights leaving soon

Find last-minute flight options from Seattle to Ontario for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 446,632 searches. Data last updated 6 May 2024.
Users seeking a last-minute flight from Seattle to Ontario should consider booking one of these fares. Users should be sure to double check the price, date, and time of their last-minute flight.
Thu 16/52:32 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 20/510:14 a.m.ONT - SEA
Nonstop2h 53mFrontier
Deal found 5/5C$ 346
Tue 14/56:55 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Tue 21/58:09 p.m.ONT - SEA
Nonstop2h 41mAlaska Airlines
Deal found 4/5C$ 427
Tue 14/57:20 a.m.SEA - ONT
1 stop4h 53mDelta
Tue 21/56:50 a.m.ONT - SEA
Nonstop3h 00mDelta
Deal found 5/5C$ 439
Tue 14/59:51 a.m.SEA - ONT
1 stop6h 45mDelta
Tue 21/51:20 p.m.ONT - SEA
1 stop5h 06mDelta
Deal found 5/5C$ 453
Tue 14/51:32 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Sun 19/56:00 a.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 5/5C$ 454
Thu 16/52:32 p.m.SEA - ONT
Nonstop2h 44mFrontier
Mon 20/59:05 a.m.ONT - SEA
1 stop8h 24mFrontier
Deal found 5/5C$ 456
Sun 12/59:26 p.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Mon 27/56:00 a.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 5/5C$ 461
Tue 14/54:18 p.m.SEA - ONT
1 stop5h 35mAlaska Airlines
Sun 19/56:00 a.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 5/5C$ 467
Sun 12/52:50 p.m.SEA - ONT
1 stop7h 03mAlaska Airlines
Mon 27/56:00 a.m.ONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 5/5C$ 473

One-way flights to Ontario from Seattle

Search for one-way flight options from Seattle to Ontario. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 446,632 searches. Data last updated 6 May 2024.
Take a look at some of the best available options we've come across on one-way flights from Seattle to Ontario. Users needing a return flight from Seattle to Ontario should utilize the search form above.
Tue 6/86:30 a.m.SEA - ONT
Nonstop2h 35mAlaska Airlines
Deal found 6/5C$ 108
Wed 5/65:30 a.m.SEA - ONT
1 stop6h 43mDelta
Deal found 6/5C$ 120
Sat 13/76:30 a.m.SEA - ONT
Nonstop2h 35mAlaska Airlines
Deal found 6/5C$ 142
Fri 7/67:13 p.m.SEA - ONT
1 stop4h 29mDelta
Deal found 6/5C$ 148
Mon 27/56:32 a.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Deal found 6/5C$ 149
Tue 28/55:30 a.m.SEA - ONT
1 stop6h 43mDelta
Deal found 4/5C$ 155
Wed 3/77:16 a.m.SEA - ONT
1 stop4h 59mUnited Airlines
Deal found 6/5C$ 168
Sat 6/78:15 a.m.SEA - ONT
Nonstop2h 48mDelta
Deal found 6/5C$ 177
Wed 22/55:09 p.m.SEA - ONT
1 stop6h 34mDelta
Deal found 5/5C$ 189

Find flights from Seattle to Ontario within your budget

Customize your flight search to find flights from Seattle to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 446,632 searches. Data last updated 6 May 2024.

Fly from

Any airport

Fly to

Any airport

Budget

C$ 108 - C$ 420

Route

Depart

Return

Price

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Thu 13/6

Nonstop2h 44m

Ontario

Mon 17/6

Nonstop2h 53m

C$ 108

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Mon 10/6

Nonstop2h 44m

Ontario

Mon 17/6

Nonstop2h 53m

C$ 120

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Thu 13/6

Nonstop2h 44m

Ontario

Mon 17/6

Nonstop2h 53m

C$ 122

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Mon 10/6

Nonstop2h 44m

Ontario

Tue 18/6

Nonstop2h 53m

C$ 130

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 28/5

Nonstop2h 44m

Ontario

Sun 2/6

Nonstop2h 53m

C$ 133

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Mon 10/6

Nonstop2h 44m

Ontario

Mon 17/6

Nonstop2h 53m

C$ 134

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 12/6

Nonstop2h 33m

Ontario

Wed 12/6

Nonstop2h 41m

C$ 215

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 25/6

1 stop6h 47m

Ontario

Wed 10/7

Nonstop2h 49m

C$ 227

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 28/5

1 stop6h 15m

Ontario

Sun 2/6

1 stop4h 50m

C$ 420

Flights are sorted by cheapest first

Deals found on 5/5

When is the best time to book a flight from Seattle to Ontario?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Ontario. Price data was last updated on 3 May 2024.
Booking 65 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Search Deals

When is the cheapest time to fly from Seattle to Ontario?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Ontario. Price data was last updated on 5 May 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Seattle to Ontario flight should consider departing on Saturday mornings when fares are most often at their lowest. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Average price of flights to Ontario by month

Plan your trip from Seattle to Ontario by taking into account the cheapest months to travel. The average price of a one-way flight from Seattle to Ontario is currently C$ 151 while a round-trip flight costs C$ 179. Price data was last updated on 5 May 2024.

Currently, September is the cheapest month in which you can book a flight from Seattle to Ontario (average of C$ 243). Flying from Seattle to Ontario in August is currently the most expensive (average of C$ 539). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

January

C$ 415

February

C$ 469

March

C$ 568

April

C$ 437

May

C$ 560

June

C$ 549

July

C$ 620

August

C$ 738

September

C$ 333

October

C$ 519

November

C$ 655

December

C$ 523

Temperature and rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average temperature and rainfall totals by month.

LAX

Temperature

14 - 23 °C

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated 6 May 2024.
Read reviews from past customers who have flown Alaska Airlines, Frontier and Delta from Seattle to Ontario. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.2
Very good
6,084 reviews
Check prices

Boarding

8.3

Comfort

8.1

Overall

8.2

Crew

8.7

Food

7.3

Entertainment

7.8

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Southwest
8.2
Very good
6,084 reviews
Southwest
8.2
Very good
6,084 reviews
Check prices

Boarding

8.3

Comfort

8.1

Overall

8.2

Crew

8.7

Food

7.3

Entertainment

7.8

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Alaska Airlines
8.1
Very good
9,137 reviews
Southwest
8.2
Very good
6,084 reviews
Check prices

Boarding

8.3

Comfort

8.1

Overall

8.2

Crew

8.7

Food

7.3

Entertainment

7.8

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Delta
8.1
Very good
10,818 reviews
Southwest
8.2
Very good
6,084 reviews
Check prices

Boarding

8.3

Comfort

8.1

Overall

8.2

Crew

8.7

Food

7.3

Entertainment

7.8

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

United Airlines
7.4
Good
11,090 reviews
Southwest
8.2
Very good
6,084 reviews
Check prices

Boarding

8.3

Comfort

8.1

Overall

8.2

Crew

8.7

Food

7.3

Entertainment

7.8

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Frontier
6.3
Okay
4,090 reviews
Southwest
8.2
Very good
6,084 reviews
Check prices

Boarding

8.3

Comfort

8.1

Overall

8.2

Crew

8.7

Food

7.3

Entertainment

7.8

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from Seattle to Ontario?

    To fly from Seattle to Ontario, you need to book a flight from Seattle/Tacoma Intl (SEA) to Ontario (ONT). Nonstop flights to Ontario from Seattle/Tacoma Intl take 2h 32m on average. When it comes time to book airfare, you have a few options: there are 13 outbound flights from Seattle/Tacoma Intl to Ontario offered by 2 different airlines.

  • Can I find flights from Seattle to Ontario for under C$ 200 on Cheapflights?

    Yes, there are multiple flights from Seattle to Ontario for under C$ 200. The cheapest flight booked recently is on Frontier for just C$ 108, but on average you can expect to pay C$ 151.

  • Are there direct flights from Seattle to Ontario for under C$ 200 on Cheapflights?

    Cheapflights has 20 direct flights from Seattle to Ontario under C$ 200. A good price for a direct flight from Seattle to Ontario is less than C$ 151.

  • Are there last-minute flights available from Seattle to Ontario for under C$ 400?

    There are currently 20+ open flights from Seattle to Ontario within the next 7 days for less than C$ 400.

  • What days are direct flights available from Seattle to Ontario?

    Direct flights can be found on the following days: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday.

  • How popular is this Seattle to Ontario flight route?

    Within the past month, 10 users have taken a look at flights from Seattle/Tacoma Intl to Ontario.

  • How many flights depart from Seattle to Ontario on average per day?

    Per day, 23 flights depart from Seattle to Ontario on average.
    Morning (6am - Midday) - 4% of flight departures
    Afternoon (Noon - 6pm) - 78% of flight departures
    Evening (6pm - Midnight) - 17% of flight departures

  • How long is the flight from Seattle to Ontario?

    For as low as C$ 108, Frontier can have you in Ontario from Seattle in 2h 44m. Seattle and Ontario are separated by a distance of 1548 km. All flights are typically direct.

  • What is the cheapest airline to fly from Seattle to Ontario round-trip?

    Cheapflights users have booked flights from Seattle to Ontario round-trip from C$ 108. Frontier is currently priced 63% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Seattle to Ontario one-way?

    C$ 108 is the cheapest one-way deal found within the past few days, from Alaska Airlines. You may also be able to find cheap deals on Delta and United Airlines, with prices starting from C$ 120 and C$ 168, respectively.

  • What are the most reliable airlines from Seattle to Ontario?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to Ontario on time: WestJet (100%), Korean Air (88%), KLM (88%).

  • What are the cheapest flights from Seattle to Ontario?

    Looking for the cheapest flight from Seattle to Ontario? While on average our users pay C$ 103, our data indicates the cheapest price to be C$ 79. The most popular route (Seattle/Tacoma Intl - Ontario), is priced around C$ 187.

  • What does SEA to ONT mean?

    This is defined as Seattle/Tacoma Intl Airport (SEA) and Ontario Airport (ONT). Codes like Ontario Airport are often used to just call airports uniquely.

  • Can I find deals for flights from Seattle to Ontario that include extra baggage allowance?

    The amount of baggage you can bring on your Seattle to Ontario flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Seattle to Ontario with specific airlines?

    Yes, Cheapflights allows you to browse and filter Seattle to Ontario flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Seattle to Ontario that include hotel bookings?

    Yes. In addition to deals on Seattle to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Ontario.

  • Can I find deals for business class flights from Seattle to Ontario?

    Yes. Cheapflights offers flight deals from Seattle to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Seattle to Ontario that allow pets onboard?

    Many airlines flying from Seattle to Ontario offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Seattle to Ontario?

    Yes, you can often find last-minute deals on Seattle to Ontario flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Seattle to Ontario flight deals updated?

    The Seattle to Ontario flight deals you see on this page were last updated on 5/5.

See more FAQs

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Top 2 airlines flying from Seattle to Ontario

Discover the top 2 airlines that operate flights from Seattle to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 446,632 searches. Data last updated 6 May 2024.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 161AverageC$ 273FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
DeltaCheapestC$ 176AverageC$ 286FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
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Search flights from Seattle to Ontario by cabin class

Find flights from Seattle to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
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Hourly flight availability from Seattle to Ontario

Find hourly flight availability from Seattle to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 6 May 2024.
1%of flight departuresEarly morningMidnight to 6 am
12%of flight departuresMorning6 am to noon
51%of flight departuresAfternoonNoon to 6 pm
36%of flight departuresEvening6 pm to midnight
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Weekly flight availability from Seattle to Ontario

Explore weekly flight availability from Seattle to Ontario. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 6 May 2024.
Sunday15daily flights
Monday16daily flights
Tuesday11daily flights
Wednesday10daily flights
Thursday14daily flights
Friday16daily flights
Saturday13daily flights

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How does Cheapflights help users find flights from Seattle to Ontario?

When you search for this flight from Seattle to Ontario, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Ontario?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Seattle to Ontario.

Can Cheapflights find flights from Seattle to Ontario with no change fees?

Yes! Cheapflights helps users easily find flights from Seattle to Ontario with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Ontario become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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