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$153+ Cheap flights from Washington to Ontario

SEA — YYZ
Dec 4 — Dec 111
Fri 12/4
Fri 12/11
1 adult, Economy
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Cheap flight deals from Washington to Ontario

Cheapest flights from Washington to Ontario

Fri 12/42:30 pm -
2 stops12h 15m
Thu 12/107:30 am -
1 stop9h 10m
Deal found 11/3$404
Fri 12/42:30 pm -
2 stops12h 15m
Fri 12/116:10 am -
1 stop10h 30m
Deal found 11/4$405
Tue 12/82:30 pm -
2 stops12h 15m
Sun 12/136:10 am -
1 stop10h 30m
Deal found 11/3$406
Sat 12/52:20 pm -
2 stops12h 25m
Fri 12/116:10 am -
1 stop10h 30m
Deal found 11/2$407
Fri 12/42:30 pm -
2 stops12h 15m
Tue 12/87:30 am -
1 stop9h 10m
Deal found 11/3$408
Mon 11/302:30 pm -
2 stops12h 15m
Mon 12/77:30 am -
1 stop9h 10m
Deal found 10/31$409
Sun 12/132:30 pm -
2 stops12h 15m
Wed 12/166:10 am -
1 stop10h 30m
Deal found 11/4$410
Thu 12/242:30 pm -
2 stops12h 15m
Thu 12/316:10 am -
1 stop10h 30m
Deal found 11/2$412
Mon 12/282:30 pm -
2 stops12h 15m
Thu 12/317:30 am -
1 stop9h 10m
Deal found 11/3$414
Sat 12/122:20 pm -
2 stops12h 25m
Tue 12/157:30 am -
1 stop9h 10m
Deal found 11/4$416
Sun 12/132:30 pm -
2 stops12h 15m
Tue 12/157:30 am -
1 stop9h 10m
Deal found 11/4$418
Wed 12/95:05 am -
1 stop6h 57m
Sat 12/125:55 pm -
1 stop7h 20m
Deal found 11/1$430

Find flight deals from Washington to Ontario

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$398
(Kiwi.com)

One-way from

$153
(Alaska Airlines)

Popular in

July

Cheapest in

January

Average price

$295

Good round-trip deal

$599 or less

Good one-way deal

$310 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Toronto (YTO) flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Toronto (YTO) flights.
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From Washington to Ontario
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One-way flight from Washington to Ontario
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($123 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in November 2026
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Price to beat on a round-trip flight from Washington to Ontario.
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Price to beat on a one-way flight from Washington to Ontario.
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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

Tue 12/15

7:15 am-9:56 pm

2 stops11h 41m

Toronto Pearson Intl

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$200

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Wed 12/9

2:30 pm-5:45 am

2 stops12h 15m

Toronto Pearson Intl

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$200

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Sat 1/9

8:43 am-10:59 pm

2 stops11h 16m

Toronto Pearson Intl

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$201

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Wed 12/16

7:15 am-9:56 pm

2 stops11h 41m

Toronto Pearson Intl

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$201

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Mon 12/14

7:15 am-9:56 pm

2 stops11h 41m

Toronto Pearson Intl

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$201

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Sat 2/20

8:21 am-4:05 pm

Nonstop4h 44m

Toronto Pearson Intl

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$215
Quickest round-trip

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Wed 12/16

8:33 am-4:05 pm

Nonstop4h 32m

Toronto Pearson Intl

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$215

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Sat 11/21

2:20 pm-5:45 am

2 stops12h 25m

Toronto Pearson Intl

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$225

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Wed 12/30

9:30 am-10:59 pm

1 stop10h 29m

Toronto Pearson Intl

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$225

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Sun 12/13

8:33 am-4:05 pm

Nonstop4h 32m

Toronto Pearson Intl

Wed 12/31

12:00 am-9:00 pm

Nonstop0h 00m

$226

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/3

Showing 1-10 of 60 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 $286). Flying from State of Washington to Region of Ontario in December is currently the most expensive (average of $645). 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?

When flying from State of Washington to Region of Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from State of Washington to Region of Ontario

The most flights from USWA to CAON are scheduled on a Tuesday (5 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (2 on average).

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

Airfare is below average for this route at the moment.
State of Washington to Region of Ontario flights typically cost between $438 and $717 in January.
The cheapest round-trip price found within the last 5 days was $398 on WestJet (Jan 15-Jan 19).

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

Booking 64 days in advance of your planned departure date is, on average, the best time to get cheap flights from State of Washington to Region of Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Reviews of airlines servicing Ontario

Peruse reviews from past customers who have flown with Alaska Airlines,Delta, andUnited Airlines from Washington to Ontario to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
13,139 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Boarding

8.1

Overall

7.9

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
13,139 reviews
Alaska Airlines
7.9
Good
13,139 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Boarding

8.1

Overall

7.9

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.
Delta
7.8
Good
8,698 reviews
Alaska Airlines
7.9
Good
13,139 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Boarding

8.1

Overall

7.9

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.
United Airlines
7.3
Good
10,461 reviews
Alaska Airlines
7.9
Good
13,139 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Boarding

8.1

Overall

7.9

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
3,441 reviews
Alaska Airlines
7.9
Good
13,139 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Boarding

8.1

Overall

7.9

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
11,857 reviews
Alaska Airlines
7.9
Good
13,139 reviews

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Boarding

8.1

Overall

7.9

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?

    Departing from State of Washington to Region of Ontario will take you 6h 57m. State of Washington and Region of Ontario are separated by a distance of 1831 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from State of Washington to Region of Ontario one-way?

    To fly one-way, consider booking your trip with Alaska Airlines, which is currently one of the cheapest options available, starting at $80. WestJet flights start at $90 while deals on Air Canada start at $99 one-way.

  • 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 $286). Flying from State of Washington to Region of Ontario in December is currently the most expensive (average of $645). 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

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Top 5 airlines flying from Washington to Ontario

AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$142Average$417FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$162Average$534FlexibilityNo cancel feeOn-time67%
WestJetCheapest$240Average$396FlexibilityNo cancel feeOn-time60%
Alaska AirlinesCheapest$245Average$531FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$277Average$582FlexibilityNo cancel feeOn-time69%

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