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Cheap flights from Washington to Ontario from C$ 229

SEA — YYZ
29 Nov — 6 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Washington to Ontario

Enter your travel dates to find the best prices.

Cheapest flights from Washington to Ontario

Tue 1/122:30 p.m. -
2 stops12h 15m
Tue 8/127:30 a.m. -
1 stop9h 10m
Deal found 25/10C$ 549
Sat 21/112:20 p.m. -
2 stops12h 25m
Tue 1/126:10 a.m. -
1 stop10h 30m
Deal found 25/10C$ 554
Tue 17/112:30 p.m. -
2 stops12h 15m
Mon 23/117:30 a.m. -
1 stop9h 10m
Deal found 27/10C$ 560
Fri 11/122:30 p.m. -
2 stops12h 15m
Sun 13/127:30 a.m. -
1 stop9h 10m
Deal found 30/10C$ 564
Tue 24/112:30 p.m. -
2 stops12h 15m
Tue 1/127:30 a.m. -
1 stop9h 10m
Deal found 27/10C$ 570
Tue 17/112:30 p.m. -
2 stops12h 15m
Tue 24/117:30 a.m. -
1 stop9h 10m
Deal found 27/10C$ 571
Mon 14/128:33 a.m. -
1 stop10h 18m
Mon 21/126:10 a.m. -
1 stop10h 30m
Deal found 30/10C$ 574
Wed 25/112:30 p.m. -
2 stops12h 15m
Tue 1/126:10 a.m. -
1 stop10h 30m
Deal found 26/10C$ 580
Wed 16/124:58 p.m. -
2 stops25h 57m
Tue 5/17:30 a.m. -
1 stop9h 10m
Deal found 30/10C$ 581
Wed 9/127:00 a.m. -
1 stop11h 15m
Sat 12/1210:53 a.m. -
1 stop14h 22m
Deal found 27/10C$ 600
Sun 22/116:06 a.m. -
1 stop6h 59m
Sun 24/13:25 p.m. -
1 stop11h 31m
Deal found 28/10C$ 617
Fri 4/121:16 p.m. -
1 stop7h 42m
Sun 6/126:20 a.m. -
1 stop8h 53m
Deal found 29/10C$ 630

Find flight deals from Washington to Ontario

Round-trip from

C$ 549

One-way from

C$ 229

Popular in

July

Cheapest in

January

Average price

C$ 824

Good round-trip deal

C$ 322 or less

Good one-way deal

C$ 333 or less
WestJet
  • WestJet
  • 1/12-8/12
  • 3 total stops
  • 21h 25m total
  • Washington to Ontario
Search Deals
14/12-31/12
  • 14/12-31/12
  • 3 total stops
  • 39h 24m total
  • Washington to Ontario
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (C$ 239 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 41 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2026
Search Deals
Price to beat on a round-trip flight from Washington to Ontario.
Search Deals
Price to beat on a one-way flight from Washington to Ontario.
Search Deals

Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Washington to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Fri 8/1

2:30 p.m.-5:45 a.m.

2 stops12h 15m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 286

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Wed 16/12

7:15 a.m.-9:56 p.m.

2 stops11h 41m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 289

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Sat 9/1

8:43 a.m.-10:59 p.m.

2 stops11h 16m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 295

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Wed 3/2

9:15 a.m.-10:59 p.m.

2 stops10h 44m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 295

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Sat 9/1

10:29 a.m.-6:50 a.m.

1 stop17h 21m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 296
Quickest round-trip

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Sat 12/12

8:33 a.m.-4:05 p.m.

Nonstop4h 32m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 300

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Sat 26/12

8:33 a.m.-4:05 p.m.

Nonstop4h 32m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 300

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Sat 28/11

8:31 a.m.-4:05 p.m.

Nonstop4h 34m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 300

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Mon 14/12

8:33 a.m.-4:05 p.m.

Nonstop4h 32m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 316

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Mon 30/11

8:31 a.m.-4:05 p.m.

Nonstop4h 34m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 316

Flights are sorted by cheapest round-trip flights first.

Deals found on 25/10

Showing 1-10 of 43 resultsSorted by cheapest first
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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

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$ 399). Flying from State of Washington to Region of Ontario in December is currently the most expensive (average of C$ 901). 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?

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.

How much does it cost to fly round-trip from State of Washington to Region of Ontario?

Airfare is typical for this route at the moment.
State of Washington to Region of Ontario flights typically cost between C$ 364 and C$ 965 in December.
The cheapest round-trip price found within the last 5 days was C$ 549 on WestJet (1 Dec-8 Dec).

How far ahead should I book a flight from State of Washington to Region of Ontario?

The best time to book flights from State of Washington to Region of Ontario is 64 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

Reviews of airlines servicing Ontario

Get a feel of what it's like to fly with Alaska Airlines,WestJet, andAir Canada 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.
Alaska Airlines
7.9
Good
13,138 reviews
Check prices

Overall

7.9

Food

7.0

Comfort

7.8

Entertainment

7.0

Crew

8.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.
Alaska Airlines
7.9
Good
13,138 reviews
Alaska Airlines
7.9
Good
13,138 reviews
Check prices

Overall

7.9

Food

7.0

Comfort

7.8

Entertainment

7.0

Crew

8.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.
WestJet
7.2
Good
3,442 reviews
Alaska Airlines
7.9
Good
13,138 reviews
Check prices

Overall

7.9

Food

7.0

Comfort

7.8

Entertainment

7.0

Crew

8.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.
Air Canada
7.1
Good
11,834 reviews
Alaska Airlines
7.9
Good
13,138 reviews
Check prices

Overall

7.9

Food

7.0

Comfort

7.8

Entertainment

7.0

Crew

8.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.

Related info for your journey

  • How long is the flight from State of Washington to Region of Ontario?

    There are many flights that can get you from State of Washington to Region of Ontario in 4h 44m. Fly via United Airlines, Alaska Airlines, or Air Canada to get the fastest option. Airlines will cover a distance of 3306 km. Both multi-stop and direct flights can be found to your destination and back.

  • Can I find deals for flights from Washington to Ontario that include hotel bookings?

    Yes. In addition to deals on Washington to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to Ontario.

  • Can I find deals for business class flights from Washington to Ontario?

    Yes. Cheapflights offers flight deals from Washington 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 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$ 399). Flying from State of Washington to Region of Ontario in December is currently the most expensive (average of C$ 901). 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Washington to Ontario

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Los Angeles to Pearson Intl flights
Fort Lauderdale to Pierre Elliott Trudeau Intl flights
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Denver to Vancouver Intl flights
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Los Angeles to Calgary flights
John F Kennedy Intl to Calgary flights
San Francisco to Calgary flights
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Minneapolis to Vancouver Intl flights
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Top 3 airlines flying from Washington to Ontario

AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 315AverageC$ 944FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
WestJetCheapestC$ 355AverageC$ 566FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 368AverageC$ 753FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

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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.

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