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Cheap flights from Ontario to Washington from C$ 172

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Washington departing on 22/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

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WestJet Logo
7:45 a.m. - 2:19 p.m.
YYZ
-
SEA
9h 34m1 stop
WestJet Logo
3:10 p.m. - 12:28 p.m.
SEA
-
YYZ
18h 18m1 stop
C$ 255WestJet
Tue, 3 Feb - Tue, 10 Feb
Alaska Airlines Logo
4:45 p.m. - 7:18 p.m.
YYZ
-
SEA
5h 33mdirect
Alaska Airlines Logo
7:55 a.m. - 3:35 p.m.
SEA
-
YYZ
4h 40mdirect
C$ 256Alaska Airlines
Fri, 13 Feb - Sat, 28 Feb
WestJet Logo
7:45 a.m. - 2:20 p.m.
YYZ
-
SEA
9h 35m1 stop
WestJet Logo
3:10 p.m. - 6:58 a.m.
SEA
-
YYZ
12h 48m2 stops
C$ 260WestJet
Wed, 28 Jan - Fri, 30 Jan
Multiple Airlines Logo
7:45 a.m. - 2:20 p.m.
YYZ
-
SEA
9h 35m1 stop
Multiple Airlines Logo
7:55 a.m. - 3:35 p.m.
SEA
-
YYZ
4h 40mdirect
C$ 262Multiple Airlines
Wed, 28 Jan - Fri, 30 Jan
Air Canada Logo
7:50 p.m. - 10:16 p.m.
YYZ
-
SEA
5h 26mdirect
Air Canada Logo
8:00 p.m. - 6:19 a.m.
SEA
-
YYZ
7h 19m1 stop
C$ 263Air Canada
Tue, 3 Feb - Tue, 10 Feb
WestJet Logo
7:45 a.m. - 2:19 p.m.
YYZ
-
SEA
9h 34m1 stop
WestJet Logo
3:10 p.m. - 12:23 p.m.
SEA
-
YYZ
18h 13m2 stops
C$ 264WestJet
Tue, 3 Feb - Tue, 10 Feb
Air Canada Logo
9:00 a.m. - 2:31 p.m.
YYZ
-
SEA
8h 31m1 stop
Air Canada Logo
8:00 p.m. - 6:19 a.m.
SEA
-
YYZ
7h 19m1 stop
C$ 270Air Canada
Tue, 3 Feb - Sun, 8 Feb
United Airlines Logo
3:00 p.m. - 9:49 p.m.
YUL
-
PDX
9h 49m1 stop
United Airlines Logo
11:59 p.m. - 2:00 p.m.
PDX
-
YUL
11h 01m1 stop
C$ 435United Airlines
Fri, 23 Jan - Fri, 23 Jan
Delta Logo
2:40 p.m. - 8:30 p.m.
YUL
-
PDX
8h 50m1 stop
Delta Logo
6:00 a.m. - 11:45 p.m.
PDX
-
YUL
14h 45m2 stops
C$ 441Delta
Fri, 20 Feb - Mon, 23 Feb
United Airlines Logo
7:00 a.m. - 11:06 p.m.
YUL
-
PDX
19h 06m2 stops
United Airlines Logo
7:00 a.m. - 9:17 p.m.
PDX
-
YUL
11h 17m1 stop
C$ 442United Airlines
Sun, 18 Jan - Tue, 20 Jan

Alaska Airlines flights from Region of Ontario to State of Washington

Our best Alaska Airlines deals on Region of Ontario to State of Washington flight tickets
Alaska Airlines
13 Feb
YYZ4:45 p.m.Toronto Pearson Intl
5h 33m
SEA7:18 p.m.Seattle/Tacoma Intl
28 Feb
SEA7:55 a.m.Seattle/Tacoma Intl
4h 40m
YYZ3:35 p.m.Toronto Pearson Intl
C$ 256
Find similar
Alaska Airlines
7 Mar
YYZ4:45 p.m.Toronto Pearson Intl
5h 33m
SEA7:18 p.m.Seattle/Tacoma Intl
11 Mar
SEA7:55 a.m.Seattle/Tacoma Intl
4h 40m
YYZ3:35 p.m.Toronto Pearson Intl
C$ 279
Find similar
Alaska Airlines
5 Mar
YYZ4:45 p.m.Toronto Pearson Intl
5h 33m
SEA7:18 p.m.Seattle/Tacoma Intl
11 Mar
SEA7:55 a.m.Seattle/Tacoma Intl
4h 40m
YYZ3:35 p.m.Toronto Pearson Intl
C$ 288
Find similar

Air Canada flights from Region of Ontario to State of Washington

Our best Air Canada deals on Region of Ontario to State of Washington flight tickets
Air Canada
3 Feb
YYZ7:50 p.m.Toronto Pearson Intl
5h 26m
SEA10:16 p.m.Seattle/Tacoma Intl
10 Feb
SEA8:00 p.m.Seattle/Tacoma Intl
7h 19m
1 stop
YYZ6:19 a.m.Toronto Pearson Intl
C$ 263
Find similar
Air Canada
3 Feb
YYZ9:00 a.m.Toronto Pearson Intl
8h 31m
1 stop
SEA2:31 p.m.Seattle/Tacoma Intl
8 Feb
SEA8:00 p.m.Seattle/Tacoma Intl
7h 19m
1 stop
YYZ6:19 a.m.Toronto Pearson Intl
C$ 270
Find similar
Air Canada
27 Jan
YYZ2:10 p.m.Toronto Pearson Intl
8h 06m
1 stop
SEA7:16 p.m.Seattle/Tacoma Intl
3 Feb
SEA5:50 a.m.Seattle/Tacoma Intl
10h 36m
2 stops
YYZ7:26 p.m.Toronto Pearson Intl
C$ 278
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Region of Ontario to State of 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, momondo users made 96,600 searches. Data last updated 6 January 2026.
Use the filters below to find and compare flights from Ontario to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 3/2

7:45 a.m.-2:19 p.m.

1 stop9h 34m

Seattle/Tacoma Intl

Tue 10/2

3:10 p.m.-12:28 p.m.

1 stop18h 18m

C$ 255

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 13/2

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

Seattle/Tacoma Intl

Sat 28/2

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

C$ 256

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 28/1

7:45 a.m.-2:20 p.m.

1 stop9h 35m

Seattle/Tacoma Intl

Fri 30/1

3:10 p.m.-6:58 a.m.

2 stops12h 48m

C$ 260

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 28/1

7:45 a.m.-2:20 p.m.

1 stop9h 35m

Seattle/Tacoma Intl

Fri 30/1

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

C$ 262

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 3/2

7:50 p.m.-10:16 p.m.

Nonstop5h 26m

Seattle/Tacoma Intl

Tue 10/2

8:00 p.m.-6:19 a.m.

1 stop7h 19m

C$ 263

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 3/2

7:45 a.m.-2:19 p.m.

1 stop9h 34m

Seattle/Tacoma Intl

Tue 10/2

3:10 p.m.-12:23 p.m.

2 stops18h 13m

C$ 264

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 3/2

9:00 a.m.-2:31 p.m.

1 stop8h 31m

Seattle/Tacoma Intl

Sun 8/2

8:00 p.m.-6:19 a.m.

1 stop7h 19m

C$ 270

MontrealPortland

YUL - PDX

YULPDX

Montreal Pierre Elliott Trudeau Intl

Fri 23/1

3:00 p.m.-9:49 p.m.

1 stop9h 49m

Portland

Fri 23/1

11:59 p.m.-2:00 p.m.

1 stop11h 01m

C$ 435

MontrealPortland

YUL - PDX

YULPDX

Montreal Pierre Elliott Trudeau Intl

Fri 20/2

2:40 p.m.-8:30 p.m.

1 stop8h 50m

Portland

Mon 23/2

6:00 a.m.-11:45 p.m.

2 stops14h 45m

C$ 441

MontrealPortland

YUL - PDX

YULPDX

Montreal Pierre Elliott Trudeau Intl

Sun 18/1

7:00 a.m.-11:06 p.m.

2 stops19h 06m

Portland

Tue 20/1

7:00 a.m.-9:17 p.m.

1 stop11h 17m

C$ 442

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Washington from

How to get the cheapest flight ticket from Region of Ontario to State of Washington

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to State of Washington?

In general, February is the cheapest month to fly from Region of Ontario to State of Washington. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 359. If you’re not able to fly to State of Washington in February, then November is your next best option. Flight prices from Region of Ontario to State of Washington during November average around C$ 423.

What is the cheapest day to depart on your flight to State of Washington?

On average, the least expensive day to fly to State of Washington from Region of Ontario is on a Thursday. momondo users have found tickets for Thursday departures for as low as C$ 539. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Monday as prices are generally higher than usual. According to our data, the average ticket price to State of Washington on Monday is C$ 792.

What is the cheapest time of day to depart on your flight to State of Washington?

According to our data, the cheapest time of day to fly to State of Washington is in the evening. momondo users have found flights departing from Region of Ontario to State of Washington in the evening for as low as C$ 438. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are C$ 852 on average. Flights to State of Washington from Region of Ontario in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Ontario to Washington flight route?

Fly from Toronto Pearson Intl to Seattle/Tacoma Intl for the best Ontario - Washington flight prices

How far in advance should I book a flight to State of Washington?

You are more likely to see cheaper flights to State of Washington from Region of Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to State of Washington for around C$ 485 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to State of Washington from Region of Ontario for as low as C$ 406 on momondo.

What cabin class options are available on Ontario to Washington flights?

There are 4 cabin classes available to choose from on Ontario to Washington flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Region of Ontario to State of Washington flights?

You could potentially save up to 2% on your flight if you consider stops on a Region of Ontario to State of Washington flight.

Cheap Region of Ontario to State of Washington flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Region of Ontario to State of Washington

Best price found

C$ 249

Fastest flight time

5h 20m

Direct flights

Every day

Airports in State of Washington

96 airports
The best one-way flight to State of Washington from Region of Ontario in the past 72 hours is C$ 249. The best round-trip flight deal from Region of Ontario to State of Washington found on momondo in the last 72 hours is C$ 311.
The fastest flight from Region of Ontario to State of Washington takes 5h 20m
Direct flights go from Region of Ontario to State of Washington every day.
There are 96 airports in State of Washington. From Region of Ontario there are direct flights to Seattle/Tacoma Intl (SEA).
Search flight deals

  • When did momondo last update prices for flights from Ontario to Washington?

    Prices for flights from Ontario to Washington are updated daily.

  • How many operators does momondo search for flights from Ontario to Washington?

  • How old do you have to be to fly from Ontario to Washington?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario to Washington.

  • What documentation or ID do you need to fly to Washington?

    The necessary travel and health documents for your Washington trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Region of Ontario to State of Washington?

Best airlines flying from Region of Ontario to State of Washington

Compare and see reviews for airlines that fly from Region of Ontario to State of Washington with momondo
Airline
Rating
Free Cancellation
Price
WestJetPriceFrom C$ 182Free CancellationRating
7.2
3,235 reviews
Search WestJet flights
United AirlinesPriceFrom C$ 277Free CancellationRating
7.4
9,132 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom C$ 277Free CancellationRating
8.0
11,648 reviews
Search Alaska Airlines flights
Air CanadaPriceFrom C$ 336Free CancellationRating
7.1
10,597 reviews
Search Air Canada flights
DeltaPriceFrom C$ 341Free CancellationRating
7.9
8,017 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom C$ 409Free CancellationRating
7.8
2,824 reviews
Search Hawaiian Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Washington?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to Washington. momondo saves you time and could save you money on your trip.

Can I find flights from Ontario to Washington with flexible booking policies on momondo?

Yes. All flights to Washington from Ontario on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Ontario to Washington?

momondo provides multiple filters to help you find the best flight to Washington from Ontario. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Ontario to Washington right now. Can momondo alert me if prices change?

Price alerts on flights to Washington from Ontario are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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