Cheap flights from Seattle to Ontario from C$ 116
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 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Ontario are usually found in September or August, booked 72 days in advance, depart on a Saturday or Tuesday and return on a Saturday
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 25 marzo 2025.
Round-trip from | C$ 232 |
---|---|
One-way from | C$ 116 |
Popular in | December |
Cheapest in | September |
Average price | C$ 295 |
Good round-trip deal | C$ 176 or less |
Good one-way deal | C$ 89 or less |
Find flight deals from Seattle to Ontario
Cheapest flights from Seattle to OntarioExplore 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 25 marzo 2025.
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 25 marzo 2025.
Cheapflights Fare Finder
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 629,999 searches. Data last updated 25 marzo 2025.
Use the filters below to find and compare flights from Seattle to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
SeattleOntario
SEA - ONT
SEAONT
Seattle/Tacoma Intl
sáb. 10/5
5:05 a.m.-12:24 p.m.
1 stop7h 19m
Ontario
mié. 14/5
6:00 a.m.-11:49 a.m.
1 stop5h 49m
SeattleOntario
SEA - ONT
SEAONT
Seattle/Tacoma Intl
dom. 4/5
6:50 p.m.-9:25 p.m.
Nonstop2h 35m
Ontario
lun. 5/5
4:29 p.m.-7:32 p.m.
Nonstop3h 03m
SeattleOntario
SEA - ONT
SEAONT
Seattle/Tacoma Intl
mar. 15/4
11:15 a.m.-1:55 p.m.
Nonstop2h 40m
Ontario
mar. 22/4
5:45 a.m.-8:42 a.m.
Nonstop2h 57m
SeattleOntario
SEA - ONT
SEAONT
Seattle/Tacoma Intl
mar. 15/4
8:01 a.m.-10:39 a.m.
Nonstop2h 38m
Ontario
sáb. 19/4
6:00 a.m.-8:50 a.m.
Nonstop2h 50m
SeattleOntario
SEA - ONT
SEAONT
Seattle/Tacoma Intl
mar. 15/4
11:30 a.m.-7:30 p.m.
2 stops8h 00m
Ontario
mié. 16/4
4:10 p.m.-10:20 p.m.
1 stop6h 10m
SeattleOntario
SEA - ONT
SEAONT
Seattle/Tacoma Intl
sáb. 12/4
9:23 p.m.-11:59 p.m.
Nonstop2h 36m
Ontario
vie. 18/4
7:17 p.m.-10:00 p.m.
Nonstop2h 43m
SeattleOntario
SEA - ONT
SEAONT
Seattle/Tacoma Intl
jue. 8/5
6:50 p.m.-9:25 p.m.
Nonstop2h 35m
SeattleOntario
SEA - ONT
SEAONT
Seattle/Tacoma Intl
mar. 15/4
8:01 a.m.-10:39 a.m.
Nonstop2h 38m
SeattleOntario
SEA - ONT
SEAONT
Seattle/Tacoma Intl
vie. 18/4
2:55 p.m.-11:00 p.m.
1 stop8h 05m
SeattleOntario
SEA - ONT
SEAONT
Seattle/Tacoma Intl
sáb. 17/5
5:05 a.m.-12:24 p.m.
1 stop7h 19m
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.
Cheapflights Insights
Everything you need to know about your flight from Seattle to Ontario
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 21 March 2025.
Booking 72 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, September is the cheapest month in which you can book a flight from Seattle to Ontario (average of C$ 290). Flying from Seattle to Ontario in May is currently the most expensive (average of C$ 574). 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 25 marzo 2025.
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 morning tend to be the most expensive. A flight at noon could potentially save you up to 38% on airfare.
What is the cheapest day 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 23 March 2025.
Travelers seeking maximum savings on their Seattle to Ontario flight should consider departing on Saturday at noon 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.
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 25 marzo 2025.
The most flights from SEA to ONT are scheduled on a Friday (17 on average). You will have fewer flight options on Sunday, 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 25 marzo 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest 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.
Comfort
Boarding
Crew
Overall
Food
Entertainment
Reviews
Anonymous,Aug 2024
SEA - LAS
Comfort
Boarding
Crew
Overall
Food
Entertainment
Reviews
Anonymous,Aug 2024
SEA - LAS
Comfort
Boarding
Crew
Overall
Food
Entertainment
Reviews
Anonymous,Aug 2024
SEA - LAS
Comfort
Boarding
Crew
Overall
Food
Entertainment
Reviews
Anonymous,Aug 2024
SEA - LAS
Comfort
Boarding
Crew
Overall
Food
Entertainment
Reviews
Anonymous,Aug 2024
SEA - LAS
Comfort
Boarding
Crew
Overall
Food
Entertainment
Reviews
Anonymous,Aug 2024
SEA - LAS
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.
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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.
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 629,999 searches. Data last updated 25 marzo 2025.
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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?
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