C$ 215 Find Cheap Flights from Seattle to Ontario – Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Ontario departing on 28/9. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Flight Deals

Best Ontario Flight Deals from Seattle

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Toronto
Toronto1 stopC$ 528
Ottawa
Ottawa1 stopC$ 487
London
London1 stopC$ 584
Toronto
Toronto1 stopC$ 528
Ottawa
Ottawa1 stopC$ 487
London
London1 stopC$ 584

Cheap Flights from Seattle to Ontario

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seattle to Ontario

Thu, 24 Sep - Mon, 28 Sep
WestJet Logo
7:35 p.m. - 5:35 a.m.
SEA
-
YOW
7h 00m
1 stop
WestJet Logo
12:25 p.m. - 6:45 p.m.
YOW
-
SEA
9h 20m
2 stops
C$ 487WestJet
Tue, 15 Sep - Sat, 26 Sep
WestJet Logo
7:35 p.m. - 5:35 a.m.
SEA
-
YOW
7h 00m
1 stop
WestJet Logo
1:20 p.m. - 6:45 p.m.
YOW
-
SEA
8h 25m
1 stop
C$ 520WestJet
Thu, 24 Sep - Mon, 28 Sep
WestJet Logo
7:35 p.m. - 5:35 a.m.
SEA
-
YOW
7h 00m
1 stop
WestJet Logo
8:15 p.m. - 9:40 a.m.
YOW
-
SEA
16h 25m
1 stop
C$ 521WestJet
Wed, 26 Aug - Sat, 5 Sep
Multiple Airlines Logo
7:06 p.m. - 9:55 p.m.
SEA
-
YYZ
23h 49m
2 stops
Multiple Airlines Logo
2:50 p.m. - 9:00 p.m.
YYZ
-
SEA
9h 10m
1 stop
C$ 528Multiple Airlines
Tue, 15 Sep - Fri, 9 Oct
Multiple Airlines Logo
10:57 a.m. - 8:09 p.m.
SEA
-
YYZ
30h 12m
1 stop
Multiple Airlines Logo
1:30 p.m. - 6:45 p.m.
YYZ
-
SEA
8h 15m
1 stop
C$ 531Multiple Airlines
Tue, 20 Oct - Wed, 21 Oct
Multiple Airlines Logo
8:00 a.m. - 3:45 p.m.
SEA
-
YYZ
4h 45mdirect
Multiple Airlines Logo
1:30 p.m. - 6:45 p.m.
YYZ
-
SEA
8h 15m
1 stop
C$ 545Multiple Airlines
Wed, 9 Sep - Wed, 16 Sep
Air Canada Logo
3:00 p.m. - 7:10 a.m.
SEA
-
YUL
13h 10m
2 stops
Air Canada Logo
6:00 p.m. - 10:47 p.m.
YUL
-
SEA
7h 47m
1 stop
C$ 568Air Canada
Sat, 19 Sep - Sat, 26 Sep
Alaska Airlines Logo
7:52 a.m. - 3:45 p.m.
SEA
-
YYZ
4h 53mdirect
Alaska Airlines Logo
4:55 p.m. - 7:13 p.m.
YYZ
-
SEA
5h 18mdirect
C$ 613Alaska Airlines
Tue, 20 Oct - Wed, 21 Oct
Alaska Airlines Logo
8:00 a.m. - 3:45 p.m.
SEA
-
YYZ
4h 45mdirect
Alaska Airlines Logo
4:55 p.m. - 7:26 p.m.
YYZ
-
SEA
5h 31mdirect
C$ 614Alaska Airlines
Sat, 19 Sep - Sat, 26 Sep
Air Canada Logo
8:00 a.m. - 3:41 p.m.
SEA
-
YYZ
4h 41mdirect
Air Canada Logo
6:45 p.m. - 9:04 p.m.
YYZ
-
SEA
5h 19mdirect
C$ 637Air Canada
Booking Insights

KAYAK's insights & trends for Seattle to Ontario flights

Get data-powered insights and trends into flights from Seattle to Ontario to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Seattle to Region of Ontario?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Seattle to Region of Ontario departing in August.

Flight prices are below average for this route right now.

Flights to Region of Ontario from Seattle usually cost between C$ 548 and C$ 1,042 in August.
The lowest price found in the past 5 days was C$ 528 on WestJet (26 Aug–2 Sep).

What is the cheapest Seattle to Ontario flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Ontario from Seattle found in the last 5 days was to Toronto, at C$ 866 round-trip. The most popular route is from Seattle (SEA) to Toronto Pearson Intl Airport (YYZ), and the cheapest round-trip airline ticket found on this route in the last 5 days was C$ 866.

What is the cheapest time of day to fly to Ontario?

The average price for all round-trip flights from Seattle to Ontario depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to Ontario is generally in the morning, when round-trip flights cost C$ 915 on average. The most expensive time of day to fly to Ontario is generally in the morning, which is peak travel time and where the average cost of a ticket is C$ 915.

Can I save money by flying with a layover from Seattle to Ontario?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 2 stops layover the cheapest option at C$ 400 on average.

What is the cheapest month to fly from Seattle to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Ontario, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Seattle to Ontario is January, when tickets cost C$ 386 (return) on average. On the other hand, the most expensive months are July and August, when the average cost of round-trip tickets is C$ 845 and C$ 744 respectively.

What’s the cheapest day of the week to fly from Seattle to Ontario?

The average price of all round-trip flights from Seattle to Ontario clicked on KAYAK for each day over the last 12 months.

When flying from Seattle to Ontario, you should consider leaving on a Thursday and avoid Mondays if you are looking for the best rates. For your return to Seattle, you’ll find the best rates on Thursdays and the most expensive ones on Mondays.

How far in advance should I book a flight from Seattle to Ontario?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to Ontario, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below-average price on a flight from Seattle to Ontario, you should book around 3 weeks before departure, which saves you about 55% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 14 weeks before departure.

Good to know

Low season

March

Cheapest flight

C$ 215
Best time to beat the crowds (33% less expensive on average)
Most popular time to fly (22% more expensive on average)
Flight from Seattle to Ottawa

FAQs - booking Ontario flights

  • How does KAYAK find such low prices on flights from Seattle to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Seattle to Ontario is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Seattle to Ontario with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Seattle to Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines flying from Seattle to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
Alaska AirlinesOverall score based on 12734 reviews
8.1Boarding
7.0Food
7.8Comfort
8.5Crew
7.0Entertainment
Airline reviews

Great and comfortable aircraft. Good food and the staff was amazing

10.0 ExcellentAnonymous, Jul 2026
SEA - YVR
Read more Alaska Airlines reviews

Great and comfortable aircraft. Good food and the staff was amazing

Very short leg - too short for any meals/snacks or entertainment.

We missed the flight. I had a passport issue and told the check in desk that I’m trying to resolve it but when I got approved for entry to USA at 3:32, one hour before departure, the employees had left the desk at 3:30. I tried calling and texting the numbers on the sign. No luck. Waited till the agents came back and couldn’t get a flight to our destination or close, so we flew to Las Vegas instead and drove 6 hrs to San Diego where I missed one night’s stay and the car rental that was reserved there. Extra car rental and hotel in Las Vegas was over $300. Lost tine and money. I wanted to extend the trip by two days but the $1600 SAVER fare wouldn’t let me make changes. Hours on the phone to find out there are no exceptions and no credit if cancelled in advance. Very disappointed. My son’s first vacation with me in 17 years. Wasted a lot of money. Next time I will use a local travel agent.

Booked a first class ticket and was not even offered a bottle of water…or a cracker…absolutely zero in flight service on a 1 hour flight

The second leg of my trip left without me despite being my inbound transfer only a few minutes late. My friends told the gate agent and they closed the doors and left early anyway. Then they tried to rebook me on a flight SIX hours later which only changed when I got a supervisor to make it 4 hours later. The gate agent was nasty, unhelpful, and walked away from me.

Well to start the crew is Seattle told me my luggage would go right thru to Ottawa. Not so before landing we were told to pick up luggage at carousel 8. On landing I asked and was told to pick it up & take it to the conveyer to be sent to Porter. Staff said Alaska always says that but no it doesn’t happen. As for Porter they said the flight would be a bit rough, so they offered a free wine or beer. Only snacks were provided on each flight.

Boarding was late with no communication. Flight was over an hour late with virtually no communication or updates. The app showed we had departed and were scheduled to arrive on time even though we sat on the tarmac for nearly an hour. People who were using the app to track our progress to pick us up were given erroneous information. Flight attendant was snooty when asked why app was showing us as delayed and arriving on time even though we had not left and ultimate’s not leave for over an hour. Just poor and arrogant.

My luggage was lost and doesn’t appear to be arrived any time soon.

Check in was a nightmare. We had about 15 people ahead of us but were in line for 45 minutes for priority passengers. Two people were checking in dogs and it took them forever. They even took the dogs out of the kennels to weigh them separately. Crazy! Then when we reached the front of the check in line we were told they couldn’t check us in because we were too early. Had to wait 19 minutes to check in and then check ourselves in and get back in line to drop our bags. This was first class! If I can avoid it I will never fly Alaska again. I sure didn’t get what I paid for.

It would have Bern better if the flight was on time.

Westjet was late and we missed our connecting flight with Cathay. Had to wait 8 hours. Westjet only allows 1 checked in baggage for international flights- it’s always been 2. Canada allows only 1 sandwhich bag size full off small liquids. Everything else will be tossed. Awful trip. Will never fly west jet or go to Toronto to connect flights!

I didn't think about not having the right app for wifi because my connecting flight was with Westjet and when I took off from Seattle I was thinking I would use my wifi, but realized I couldn't on my Westjet app and I did not have Delta's app downloaded.

Everything was good except for flight delay, but it was because of the snow storm in the arrival airport.

West Jet flight was cancelled and I was not notified. I found out when I tried to check in on-line. Spent 4 hours on the phone with West Jet and Just Fly trying to figure what happened.

Flight was delayed 3 times. Then cancelled due to pilot being timed out. They refused hotel vouchers. Gate attendants were very rude and could not help you at all.

Scrooge airlines spoiled my last chance at Christmas with my 95 and 92 year old folks. and rest of the family in Calgary. Ticket personnel would not let me on without a passport and I always visit Canada with my enhanced driver;s License when I travel from the US

Flight was on time. Online check in capabilities made things quick and easy. Zone boarding was enforced, which I appreciate. Everyone was not lining up ahead of their zone being called. Crew was professional and friendly.

The big lady was sitting right next to me and the button to recline my seat was blocked by her huge arm. No power outlet for chargers. No inflight Wi-Fi movies

Westjet is the worst airline in the world, they are absolutely terrible, there are to many things that happened that I can't explain in this message, I would like to talk to someone about my ordeal. I am partial handicapped and that I can only walk a short distance, I calculated how far I walked and it was more than a kilometer, the pain is so bad today I have to go to my docor, they told me there was nobody available to take me to my gate, this is just one instance. This is not finished yet, I need to contact westjet and let them know about my trip from hell

They lost our luggage and didn’t return it until 15 days AFTER we got back.

The problem in part was with the airports, not really the fault of Air Canada. Confusing directions regarding the gate, in Seattle the recommended shuttle train entrance was not working. Simular problems in Toronto. Baggage arrived in good time. Marx Bros movie on entertainment from Seattle. I was told I was laughing too loudly, by the flight attendant. No lounge in Seattle. Lounge in Toronto excellent.

Both fights were delayed. Food could be better comparing to other international flights

I found the personal kind and caring. The Problem was not enough people to serve the the customers. The flow was restricted the crowd frustrated by the wait times. Air Canada seems to hire good people but they need backup in order to provide the service we pay for.

Flight late. Chaos at checkin and boarding. Beyond that it was fine!

The flight was delayed multiple times and I arrived hours later than I thought. I also had to change my schedule.

This was a red eye return, so I doubt there would be anyway to make it better. Other than adding beds.

Lost my bag. My first ever flight with them that they forced me to gate check my bag on, due to them having a 30 year old plane with small carry on bins, and they lost my bag. Never again.

Everything else was good it would have been better if they served food considering it was a late night flight

Flight crew was great. We were on time. Movie selection was good. Food was not included but what I brought was fine. No complaints!

My flight was on time. People were pleasant and helpful. The flight was uneventful.

Everything you need to know for your flight from Seattle to Ontario

Information on your arrival and departure airports