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Cheap flights from Seattle to Ontario from C$ 55

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ONT
19 Nov — 26 Nov1
1 adult

The best prices from Seattle/Tacoma Intl to Ontario are usually found in September or August, booked 71 days in advance, depart on a Monday or Friday and return on a Monday

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 625,151 searches. Data last updated 14 November 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 31/12

7:01 p.m.-9:39 p.m.

Nonstop2h 38m

Ontario

Sun 5/1

4:26 p.m.-7:26 p.m.

Nonstop3h 00m

C$ 167

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 10/12

5:28 p.m.-8:00 p.m.

Nonstop2h 32m

Ontario

Tue 17/12

6:00 a.m.-8:53 a.m.

Nonstop2h 53m

C$ 192

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 10/12

6:50 a.m.-3:20 p.m.

1 stop8h 30m

Ontario

Tue 17/12

6:30 a.m.-11:20 a.m.

1 stop4h 50m

C$ 219

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Thu 5/12

7:45 a.m.-10:38 a.m.

Nonstop2h 53m

Ontario

Sun 8/12

5:50 a.m.-8:55 a.m.

Nonstop3h 05m

C$ 220

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 7/12

5:15 a.m.-9:53 a.m.

1 stop4h 38m

Ontario

Tue 10/12

3:20 p.m.-9:09 p.m.

1 stop5h 49m

C$ 282

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Mon 6/1

9:36 p.m.-11:44 p.m.

1 stop26h 08m

C$ 87

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 11/12

5:28 p.m.-8:00 p.m.

Nonstop2h 32m

C$ 97

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 10/12

6:00 a.m.-12:50 p.m.

1 stop6h 50m

C$ 109

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 11/12

4:23 p.m.-11:58 p.m.

1 stop7h 35m

C$ 116

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 18/12

7:35 a.m.-10:25 a.m.

Nonstop2h 50m

C$ 153

Flights are sorted by cheapest first

Deals found on 13/11

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 14 November 2024.

Round-trip from

C$ 153

One-way from

C$ 55

Popular in

December

Cheapest in

September
Frontier
  • Frontier
  • 13/2-18/2
  • Nonstop
  • 5h 24m total
  • Seattle to Ontario
Search Deals
Frontier
  • Frontier
  • 4/12
  • Nonstop
  • 2h 40m total
  • Seattle to Ontario
Search Deals
High demand for flights, 23% potential price rise
Search Deals
Best time to find cheap flights, 34% potential price drop
Search Deals

Find flight deals from Seattle to Ontario

Cheapest flights from Seattle to Ontario
Explore the most affordable flight options available from Seattle to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 14 November 2024.

Tue 31/127:01 p.m.SEA - ONT
Nonstop2h 38mFrontier
Sun 5/14:26 p.m.ONT - SEA
Nonstop3h 00mFrontier
Deal found 12/11C$ 167
Tue 10/1210:25 a.m.SEA - ONT
Nonstop2h 33mAlaska Airlines
Tue 17/126:00 a.m.ONT - SEA
Nonstop2h 53mAlaska Airlines
Deal found 14/11C$ 192
Fri 6/127:55 p.m.SEA - ONT
Nonstop2h 47mDelta
Wed 11/125:50 a.m.ONT - SEA
Nonstop3h 05mDelta
Deal found 13/11C$ 206
Tue 10/126:50 a.m.SEA - ONT
1 stop8h 30mSouthwest
Tue 17/126:30 a.m.ONT - SEA
1 stop4h 50mSouthwest
Deal found 13/11C$ 219
Tue 10/125:15 a.m.SEA - ONT
1 stop4h 38mUnited Airlines
Fri 13/126:00 a.m.ONT - SEA
1 stop4h 46mUnited Airlines
Deal found 13/11C$ 247

Best time to book a flight from Seattle to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Seattle to Ontario

Get recent, data-driven insights about flights from Seattle to Ontario including ideal travel times, pricing trends, and more.

How far ahead should I 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 8 November 2024.

Booking 71 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.

What is the cheapest month to book a flight from Seattle to Ontario?

Currently, December is the cheapest month in which you can book a flight from Seattle to Ontario (average of C$ 273). Flying from Seattle to Ontario in May is currently the most expensive (average of C$ 569). 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.

What is the cheapest time of day to fly from SEA to ONT?

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 14 November 2024.

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 61% on airfare.

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 14 November 2024.

The most flights from SEA to ONT are scheduled on a Thursday (23 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 on average).

Rainfall in Ontario by month

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

In terms of precipitation, rainfall in Ontario ranges from 3.0 - 86.0 mm per month. February is typically the wettest month, when rainfall can reach 86.0 mm. June is typically the driest time to visit Ontario when rainfall is around 3.0 mm.

Temperature in Ontario by month

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

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 26.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 12.0 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 14 November 2024.
Read reviews from past customers who have flown Southwest, Alaska Airlines and Frontier 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
8.1
Very good
5,045 reviews
Check prices

Entertainment

7.7

Boarding

8.3

Crew

8.7

Overall

8.1

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Southwest
8.1
Very good
5,045 reviews
Southwest
8.1
Very good
5,045 reviews
Check prices

Entertainment

7.7

Boarding

8.3

Crew

8.7

Overall

8.1

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Alaska Airlines
8.0
Very good
9,439 reviews
Southwest
8.1
Very good
5,045 reviews
Check prices

Entertainment

7.7

Boarding

8.3

Crew

8.7

Overall

8.1

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Delta
8.0
Very good
8,788 reviews
Southwest
8.1
Very good
5,045 reviews
Check prices

Entertainment

7.7

Boarding

8.3

Crew

8.7

Overall

8.1

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

United Airlines
7.4
Good
9,194 reviews
Southwest
8.1
Very good
5,045 reviews
Check prices

Entertainment

7.7

Boarding

8.3

Crew

8.7

Overall

8.1

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Frontier
6.1
Okay
3,551 reviews
Southwest
8.1
Very good
5,045 reviews
Check prices

Entertainment

7.7

Boarding

8.3

Crew

8.7

Overall

8.1

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

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 37m 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 3 different airlines.

  • How popular is this Seattle to Ontario flight route?

    Within the past month, 43 users have taken a look at flights from Seattle/Tacoma Intl to Ontario.

  • What are the cheapest airlines flying from Seattle to Ontario round-trip?

    Cheapflights users have booked flights from Seattle to Ontario round-trip from C$ 153. Other airlines that can offer you cheap pricing are Alaska Airlines, from C$ 192, and Delta, from C$ 220. Frontier is currently priced 46% below the average price you’ll pay for this route.

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

    C$ 55 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Alaska Airlines and Southwest, with prices starting from C$ 97 and C$ 109, 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: Air France (100%), Aeromexico (100%), Virgin Atlantic (99%).

  • 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$ 260, our data indicates the cheapest price to be C$ 143. The most popular route (Seattle/Tacoma Intl - Ontario), is priced around C$ 149.

  • 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.

  • What is the cheapest month to book a flight from Seattle to Ontario?

    Currently, December is the cheapest month in which you can book a flight from Seattle to Ontario (average of C$ 273). Flying from Seattle to Ontario in May is currently the most expensive (average of C$ 569). 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.

See more FAQs

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Alternative routes for Seattle to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Seattle to Ontario

Discover the top 3 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 625,151 searches. Data last updated 14 November 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapestC$ 80AverageC$ 152FlexibilityNo cancel feeOn-time62%
Search Frontier flights
DeltaCheapestC$ 191AverageC$ 304FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapestC$ 197AverageC$ 309FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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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