Cheap Flights from Seattle / Tacoma International Airport to Ontario from $363 Return

Flight deals from Seattle / Tacoma International Airport to Ontario

Looking for cheap tickets from Seattle / Tacoma International Airport to Ontario, or a last-minute trip? Find the lowest prices on one-way and return tickets right here.

Toronto.$363 per passenger.Departing Thu, 5 Mar, returning Mon, 9 Mar.Return flight with Air Canada.Outbound direct flight with Air Canada departs from Seattle / Tacoma International on Thu, 5 Mar, arriving in Toronto Pearson International.Inbound direct flight with Air Canada departs from Toronto Pearson International on Mon, 9 Mar, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $363, select.

London.$531 per passenger.Departing Fri, 15 May, returning Mon, 18 May.Return flight with WestJet.Outbound indirect flight with WestJet, departs from Seattle / Tacoma International on Fri, 15 May, arriving in London.Inbound indirect flight with WestJet, departs from London on Mon, 18 May, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $531, select.

Ottawa.$586 per passenger.Departing Tue, 2 Jun, returning Tue, 9 Jun.Return flight with WestJet.Outbound indirect flight with WestJet, departs from Seattle / Tacoma International on Tue, 2 Jun, arriving in Ottawa International.Inbound indirect flight with WestJet, departs from Ottawa International on Tue, 9 Jun, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $586, select.

Sault Ste Marie.$1,716 per passenger.Departing Mon, 30 Mar, returning Mon, 6 Apr.Return flight with Air Canada.Outbound indirect flight with Air Canada, departs from Seattle / Tacoma International on Mon, 30 Mar, arriving in Sault Ste Marie.Inbound indirect flight with Air Canada, departs from Sault Ste Marie on Mon, 6 Apr, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $1,716, select.

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Flying from Seattle / Tacoma International Airport to Ontario

Arm yourself with these facts on the fly.

Cheapest flight found	$363
Cheapest month to fly	March
Average flight time	4 hrs, 44 mins
Average flights per week	90
Most popular airline	Qatar Airways

How to find cheap flights from Seattle / Tacoma International Airport to Ontario

We've compared the best online travel agents and flight providers on the internet to find the cheapest plane tickets from Seattle / Tacoma International Airport to Ontario. Other savvy travellers recently found return flights from $363 and one-way tickets from $149. Ready to join them? Here are a few tips to help you do it the smart way.

Fly in March

The cheapest time to fly from Seattle / Tacoma International Airport to Ontario is currently March.

Flex your dates for the best rates

If you’re flexible on your departure dates, you can use Skyscanner's whole month tool to find the cheapest day of the year to fly from Seattle / Tacoma International Airport to anywhere you choose in Ontario.

Watch as fares rise and fall

With Price Alerts, we'll let you know when flight prices from Seattle / Tacoma International Airport to your chosen airport in Ontario go up or down so you can book when the time is just right.

Relax – these are fee-free flight tickets

With us, there are no added fees – the Ontario Airport to Ontario flight price you see when you search with us is what you pay to the provider.

Frequently asked questions

Are there any direct flights from Seattle / Tacoma International Airport to Ontario?

Yes - direct flights currently operate from Seattle / Tacoma International Airport to Toronto Pearson International Airport in Ontario.

What is the average price of a flight from Seattle / Tacoma International Airport to Ontario?

We looked at all of the upcoming return flights from Seattle / Tacoma International Airport to Ontario we could find over the next 12 months. It looks like $363 is the best price. This is good, compared to the average Ontario ticket price of $799.

What is the cheapest month to fly from Seattle / Tacoma International Airport to Ontario?

The cheapest month to fly from Seattle / Tacoma International Airport to Sault Ste Marie Airport is currently March.
The cheapest month to fly from Seattle / Tacoma International Airport to Toronto Pearson International Airport is currently March.
The cheapest month to fly from Seattle / Tacoma International Airport to Ottawa International Airport is currently June.
And the cheapest month to fly from Seattle / Tacoma International Airport to London Airport is usually May.

Which upcoming date is cheapest to fly from Seattle / Tacoma International Airport to Ontario on?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle / Tacoma International Airport to Ontario on Thursday, 5 March 2026.

If I'm flying from Seattle / Tacoma International Airport, where in Ontario is cheapest to fly into?

If you're flying from Seattle / Tacoma International, the cheapest city in Ontario to fly into is Toronto. The cheapest airport serving Toronto at the moment is Toronto Pearson International.