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Cheap flights from Washington to Ontario from C$ 163
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 27/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
5 Aug — 12 Aug1
Round-trip
1 adult
Economy
Cheap flight deals from Washington to Ontario
Keep the following information in mind while searching for Washington to Ontario flight deals. Data was last updated 31 July 2025.
Find flight deals from Washington to Ontario
Cheapest flights from Washington to OntarioExplore the most affordable flight options available from Washington to Ontario. 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 Washington to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 July 2025.
Fri 12/91:15 p.m.SEA - YYZ
1 stop8h 16mWestJet
Fri 19/912:00 p.m.YYZ - SEA
2 stops11h 29mWestJet
Deal found 29/7C$ 336
Sun 21/97:15 a.m.SEA - YTZ
1 stop9h 34mAir Canada
Tue 23/912:25 p.m.YTZ - SEA
1 stop10h 06mAir Canada
Deal found 29/7C$ 352
Sun 7/912:00 p.m.SEA - YYZ
Nonstop4h 44mAir Canada
Sat 20/98:40 a.m.YYZ - SEA
Nonstop5h 19mAir Canada
Deal found 29/7C$ 357
Tue 9/97:16 a.m.SEA - YYZ
Nonstop4h 44mAlaska Airlines
Tue 16/94:45 p.m.YYZ - SEA
Nonstop5h 23mAlaska Airlines
Deal found 30/7C$ 372
Fri 26/97:40 p.m.PDX - YYZ
1 stop9h 19mAir Canada
Mon 29/98:30 a.m.YYZ - PDX
1 stop9h 16mAir Canada
Deal found 29/7C$ 383
Fri 12/97:40 p.m.PDX - YTZ
2 stops13h 05mAir Canada
Fri 19/94:10 p.m.YTZ - PDX
2 stops9h 51mAir Canada
Deal found 29/7C$ 389
Tue 26/81:45 p.m.PDX - YYZ
1 stop7h 39mWestJet
Tue 2/98:00 a.m.YYZ - PDX
1 stop7h 48mWestJet
Deal found 28/7C$ 400
Tue 26/82:05 p.m.SEA - YHM
1 stop7h 36mWestJet
Tue 2/96:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Deal found 29/7C$ 407
Wed 27/81:50 p.m.SEA - YKF
1 stop7h 56mWestJet
Thu 28/86:00 a.m.YKF - SEA
1 stop9h 58mWestJet
Deal found 30/7C$ 418
Tue 7/108:04 p.m.PDX - YYZ
1 stop20h 54mMultiple Airlines
Wed 22/109:30 a.m.YYZ - PDX
1 stop12h 34mMultiple Airlines
Deal found 28/7C$ 423
Sat 20/91:50 p.m.SEA - YKF
2 stops12h 40mMultiple Airlines
Wed 24/96:30 a.m.YKF - SEA
2 stops16h 59mMultiple Airlines
Deal found 28/7C$ 439
Wed 3/97:39 a.m.PDX - YYZ
2 stops11h 50mAmerican Airlines
Sun 7/96:30 a.m.YYZ - PDX
1 stop11h 03mAmerican Airlines
Deal found 29/7C$ 458
Cheapflights Fare Finder
Customize your flight search to find flights from Washington 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 31 July 2025.
Use the filters below to find and compare flights from Washington to Ontario that are best for you.
Fly from
Washington
Fly to
Ontario
Route
Depart
Return
Price
SeattleToronto
SEA - YYZ
SEAYYZ
Seattle/Tacoma Intl
Fri 12/9
1:15 p.m.-12:31 a.m.
1 stop8h 16m
Toronto Pearson Intl
Fri 19/9
12:00 p.m.-8:29 p.m.
2 stops11h 29m
C$ 336
SeattleToronto
SEA - YTZ
SEAYTZ
Seattle/Tacoma Intl
Sun 21/9
7:15 a.m.-7:49 p.m.
1 stop9h 34m
Toronto Island
Tue 23/9
12:25 p.m.-7:31 p.m.
1 stop10h 06m
C$ 352
SeattleToronto
SEA - YYZ
SEAYYZ
Seattle/Tacoma Intl
Sun 7/9
12:00 p.m.-7:44 p.m.
Nonstop4h 44m
Toronto Pearson Intl
Sat 20/9
8:40 a.m.-10:59 a.m.
Nonstop5h 19m
C$ 357
SeattleToronto
SEA - YYZ
SEAYYZ
Seattle/Tacoma Intl
Tue 9/9
7:16 a.m.-3:00 p.m.
Nonstop4h 44m
Toronto Pearson Intl
Tue 16/9
4:45 p.m.-7:08 p.m.
Nonstop5h 23m
C$ 372
PortlandToronto
PDX - YYZ
PDXYYZ
Portland
Fri 17/10
6:15 a.m.-5:46 p.m.
1 stop8h 31m
Toronto Pearson Intl
Thu 23/10
8:30 a.m.-2:46 p.m.
1 stop9h 16m
C$ 383
SeattleHamilton
SEA - YHM
SEAYHM
Seattle/Tacoma Intl
Tue 26/8
2:05 p.m.-12:41 a.m.
1 stop7h 36m
Hamilton
Tue 2/9
6:00 a.m.-12:59 p.m.
1 stop9h 59m
C$ 407
SeattleToronto
SEA - YKF
SEAYKF
Seattle/Tacoma Intl
Wed 27/8
1:50 p.m.-12:46 a.m.
1 stop7h 56m
Toronto Region of Waterloo Intl
Thu 28/8
6:00 a.m.-12:58 p.m.
1 stop9h 58m
C$ 418
PortlandToronto
PDX - YYZ
PDXYYZ
Portland
Tue 16/9
8:18 p.m.-7:58 p.m.
1 stop20h 40m
Toronto Pearson Intl
Wed 1/10
9:30 a.m.-7:23 p.m.
1 stop12h 53m
C$ 425
PortlandToronto
PDX - YYZ
PDXYYZ
Portland
Tue 2/9
1:45 p.m.-12:22 a.m.
1 stop7h 37m
Toronto Pearson Intl
Sat 6/9
8:00 a.m.-1:05 p.m.
1 stop8h 05m
C$ 436
SeattleToronto
SEA - YKF
SEAYKF
Seattle/Tacoma Intl
Sat 20/9
1:50 p.m.-5:30 a.m.
2 stops12h 40m
Toronto Region of Waterloo Intl
Wed 24/9
6:30 a.m.-8:29 p.m.
2 stops16h 59m
C$ 439
Showing 1-10 of 60 results
Best time to book a flight from Washington to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Washington 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 Washington to Ontario
What is the cheapest month to book a flight from State of Washington to Region of Ontario?
Currently, January is the cheapest month in which you can book a flight from State of Washington to Region of Ontario (average of C$ 167). Flying from State of Washington to Region of Ontario in July is currently the most expensive (average of C$ 258). 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 WA to ON?
Find hourly flight availability from Washington 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 31 July 2025.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from State of Washington to Region of Ontario as you normally would.
Weekly flight availability from State of Washington to Region of Ontario
Explore weekly flight availability from Washington 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 31 July 2025.
The most flights from USWA to CAON are scheduled on a Thursday (8 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (4 on average).
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 31 July 2025.
Get a feel of what it's like to fly with Alaska Airlines,Delta, andUnited Airlines from Washington to Ontario by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.0
Boarding
8.1
Food
7.1
Entertainment
7.1
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJonathan,Jul 2025
SEA - BOS
Overall
8.0
Boarding
8.1
Food
7.1
Entertainment
7.1
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJonathan,Jul 2025
SEA - BOS
Overall
8.0
Boarding
8.1
Food
7.1
Entertainment
7.1
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJonathan,Jul 2025
SEA - BOS
Overall
8.0
Boarding
8.1
Food
7.1
Entertainment
7.1
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJonathan,Jul 2025
SEA - BOS
Overall
8.0
Boarding
8.1
Food
7.1
Entertainment
7.1
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJonathan,Jul 2025
SEA - BOS
Overall
8.0
Boarding
8.1
Food
7.1
Entertainment
7.1
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJonathan,Jul 2025
SEA - BOS
Related info for your journey
Find useful and relevant information for your journey from Washington 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 Washington to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
Top 4 airlines flying from Washington to Ontario
Discover the top 4 airlines that operate flights from Washington 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 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 Washington to Ontario?
900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Ontario from Washington today with Cheapflights!
Why should you use Cheapflights to find cheap flight tickets from Washington to Ontario?
Cheapflights simply makes it quick and affordable to book flights from Washington to Ontario by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.
Can Cheapflights find flights from Washington to Ontario with no change fees?
Certainly. Search results for flights to Ontario from Washington shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.
Can Cheapflights notify me if prices for flights from Washington to Ontario become cheaper?
Of course! You can now track prices for flights from Washington to Ontario 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.