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Cheap flights from Ontario to Washington from C$ 206
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 8/10. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SEA
5 Aug — 12 Aug1
Round-trip
1 adult
Economy
Cheap flight deals from Ontario to Washington
Keep the following information in mind while searching for Ontario to Washington flight deals. Data was last updated 31 July 2025.
Find flight deals from Ontario to Washington
Cheapest flights from Ontario to WashingtonExplore the most affordable flight options available from Ontario to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 July 2025.
Explore the most affordable flight options available from Ontario to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 July 2025.
Fri 5/92:00 p.m.YYZ - SEA
1 stop7h 36mAir Canada
Sun 14/97:15 p.m.SEA - YYZ
1 stop8h 45mAir Canada
Deal found 29/7C$ 314
Wed 17/91:30 p.m.YYZ - SEA
1 stop9h 59mWestJet
Tue 23/92:05 p.m.SEA - YYZ
1 stop7h 17mWestJet
Deal found 30/7C$ 316
Sat 13/94:00 p.m.YYZ - PDX
1 stop10h 01mAir Canada
Sun 28/97:40 p.m.PDX - YYZ
1 stop7h 21mAir Canada
Deal found 29/7C$ 324
Tue 19/83:25 p.m.YTZ - SEA
1 stop8h 20mAir Canada
Tue 9/97:15 a.m.SEA - YTZ
1 stop9h 34mAir Canada
Deal found 29/7C$ 328
Wed 1/104:45 p.m.YYZ - SEA
Nonstop5h 23mAlaska Airlines
Wed 8/107:18 a.m.SEA - YYZ
Nonstop4h 42mAlaska Airlines
Deal found 31/7C$ 338
Fri 22/86:00 a.m.YKF - SEA
1 stop9h 58mWestJet
Thu 28/81:50 p.m.SEA - YKF
1 stop7h 56mWestJet
Deal found 29/7C$ 367
Tue 19/86:00 a.m.YHM - SEA
1 stop9h 58mWestJet
Wed 27/81:50 p.m.SEA - YHM
1 stop7h 51mWestJet
Deal found 29/7C$ 375
Sat 4/1011:36 a.m.YYZ - SEA
1 stop10h 15mDelta
Wed 8/106:00 a.m.SEA - YYZ
1 stop9h 30mDelta
Deal found 30/7C$ 378
Tue 19/81:16 p.m.YYZ - PDX
1 stop13h 04mAmerican Airlines
Tue 26/85:34 a.m.PDX - YYZ
1 stop7h 50mAmerican Airlines
Deal found 29/7C$ 381
Wed 20/87:00 a.m.YYZ - PDX
1 stop7h 49mUnited Airlines
Fri 29/85:40 p.m.PDX - YYZ
1 stop10h 20mUnited Airlines
Deal found 31/7C$ 405
Wed 17/93:45 p.m.YOW - SEA
1 stop7h 44mWestJet
Thu 23/101:50 p.m.SEA - YOW
1 stop7h 50mWestJet
Deal found 30/7C$ 408
Sun 21/96:15 a.m.YKF - SEA
2 stops15h 21mMultiple Airlines
Tue 30/95:30 a.m.SEA - YKF
3 stops21h 00mMultiple Airlines
Deal found 30/7C$ 419
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Washington 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 31 July 2025.
Use the filters below to find and compare flights from Ontario to Washington that are best for you.
Fly from
Ontario
Fly to
Washington
Route
Depart
Return
Price
TorontoSeattle
YYZ - SEA
YYZSEA
Toronto Pearson Intl
Fri 5/9
2:00 p.m.-6:36 p.m.
1 stop7h 36m
Seattle/Tacoma Intl
Sun 14/9
7:15 p.m.-7:00 a.m.
1 stop8h 45m
C$ 314
TorontoSeattle
YYZ - SEA
YYZSEA
Toronto Pearson Intl
Wed 17/9
1:30 p.m.-8:29 p.m.
1 stop9h 59m
Seattle/Tacoma Intl
Tue 23/9
2:05 p.m.-12:22 a.m.
1 stop7h 17m
C$ 316
TorontoPortland
YYZ - PDX
YYZPDX
Toronto Pearson Intl
Sat 13/9
4:00 p.m.-11:01 p.m.
1 stop10h 01m
Portland
Sun 28/9
7:40 p.m.-6:01 a.m.
1 stop7h 21m
C$ 324
TorontoSeattle
YTZ - SEA
YTZSEA
Toronto Island
Tue 19/8
3:25 p.m.-8:45 p.m.
1 stop8h 20m
Seattle/Tacoma Intl
Tue 9/9
7:15 a.m.-7:49 p.m.
1 stop9h 34m
C$ 328
TorontoSeattle
YYZ - SEA
YYZSEA
Toronto Pearson Intl
Wed 1/10
4:45 p.m.-7:08 p.m.
Nonstop5h 23m
Seattle/Tacoma Intl
Wed 8/10
7:18 a.m.-3:00 p.m.
Nonstop4h 42m
C$ 338
TorontoSeattle
YKF - SEA
YKFSEA
Toronto Region of Waterloo Intl
Fri 22/8
6:00 a.m.-12:58 p.m.
1 stop9h 58m
Seattle/Tacoma Intl
Thu 28/8
1:50 p.m.-12:46 a.m.
1 stop7h 56m
C$ 367
HamiltonSeattle
YHM - SEA
YHMSEA
Hamilton
Tue 19/8
6:00 a.m.-12:58 p.m.
1 stop9h 58m
Seattle/Tacoma Intl
Wed 27/8
1:50 p.m.-12:41 a.m.
1 stop7h 51m
C$ 375
TorontoSeattle
YYZ - SEA
YYZSEA
Toronto Pearson Intl
Sat 4/10
11:36 a.m.-6:51 p.m.
1 stop10h 15m
Seattle/Tacoma Intl
Tue 7/10
6:00 a.m.-6:30 p.m.
1 stop9h 30m
C$ 378
TorontoPortland
YYZ - PDX
YYZPDX
Toronto Pearson Intl
Tue 19/8
1:16 p.m.-11:20 p.m.
1 stop13h 04m
Portland
Tue 26/8
5:34 a.m.-4:24 p.m.
1 stop7h 50m
C$ 381
TorontoPortland
YYZ - PDX
YYZPDX
Toronto Pearson Intl
Wed 20/8
7:00 a.m.-11:49 a.m.
1 stop7h 49m
Portland
Fri 29/8
5:40 p.m.-7:00 a.m.
1 stop10h 20m
C$ 405
Showing 1-10 of 58 results
Best time to book a flight from Ontario to Washington
Have a flexible travel schedule? Discover the best time to fly to Washington from Ontario 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.
Cheapflights Insights
Everything you need to know about your flight from Ontario to Washington
What is the cheapest month to book a flight from Region of Ontario to State of Washington?
Currently, January is the cheapest month in which you can book a flight from Region of Ontario to State of Washington (average of C$ 262). Flying from Region of Ontario to State of Washington in December is currently the most expensive (average of C$ 353). 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 ON to WA?
Find hourly flight availability from Ontario to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 31 July 2025.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Region of Ontario to State of Washington as you normally would.
Weekly flight availability from Region of Ontario to State of Washington
Explore weekly flight availability from Ontario to Washington. 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 31 July 2025.
The most flights from CAON to USWA are scheduled on a Wednesday (6 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (3 on average).
How much does it cost to fly round-trip from Region of Ontario to State of Washington?
Reviews of airlines servicing Washington
Get insights into the airlines that provide service to Washington. 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 Washington. Reviews last updated 31 July 2025.
Check out reviews from past customers who have flown with Alaska Airlines,Delta, andUnited Airlines from Ontario to Washington to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
7.8
Crew
8.5
Food
7.1
Overall
8.0
Boarding
8.1
Entertainment
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jul 2025
YEG - SEA
Comfort
7.8
Crew
8.5
Food
7.1
Overall
8.0
Boarding
8.1
Entertainment
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jul 2025
YEG - SEA
Comfort
7.8
Crew
8.5
Food
7.1
Overall
8.0
Boarding
8.1
Entertainment
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jul 2025
YEG - SEA
Comfort
7.8
Crew
8.5
Food
7.1
Overall
8.0
Boarding
8.1
Entertainment
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jul 2025
YEG - SEA
Comfort
7.8
Crew
8.5
Food
7.1
Overall
8.0
Boarding
8.1
Entertainment
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jul 2025
YEG - SEA
Comfort
7.8
Crew
8.5
Food
7.1
Overall
8.0
Boarding
8.1
Entertainment
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jul 2025
YEG - SEA
Related info for your journey
Find useful and relevant information for your journey from Ontario to Washington. 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 Ontario to Washington
See prices for flight routes from nearby airports that may be better suited for you.
Top 6 airlines flying from Ontario to Washington
Discover the top 6 airlines that operate flights from Ontario to Washington. 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 31 July 2025.
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 Ontario to Washington?
Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario to Washington. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.
Why should you use Cheapflights to find cheap flight tickets from Ontario to Washington?
By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Washington from Ontario.
Can Cheapflights find flights from Ontario to Washington with no change fees?
Need flexible booking options for your flight to Washington from Ontario? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.
Can Cheapflights notify me if prices for flights from Ontario to Washington become cheaper?
Of course! You can now track prices for flights from Ontario to Washington and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.