Cheap flights from Seattle (SEA) to Ontario (ON)

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How to find the cheapest flight from
Seattle (SEA) to Ontario

All the information you need to plan the best SEA to YYZ flight in 2022: compare Seattle to Ontario flight prices with the expected peak season, weather and rainfall in Ontario.
When is the cheapest time to fly from Seattle to Region of Ontario (SEA - ON)?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Region of Ontario as you normally would.

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

Users have found that booking a flight from Seattle to Region of Ontario at least 61 days early can save you up to 48% on average compared to booking a flight this week. If booking 61 days before your flight isn’t an option for you, users have found flights from Seattle to Region of Ontario for as little as $633 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $746 for flights departing within the next 3 days.

Cheap flights from Seattle to Ontario in July, August 2022

The best prices found for SEA to Ontario flights for July, August
12 Aug - 15 Aug
$426pp
SEA
Seattle/Tacoma Intl
Air Canada
   
2 STOPS
YOW
Ottawa
YOW
Ottawa
Air Canada
   
2 STOPS
SEA
Seattle/Tacoma Intl
12 Aug - 15 Aug
$431pp
SEA
Seattle/Tacoma Intl
Air Canada
   
2 STOPS
YOW
Ottawa
YOW
Ottawa
Air Canada
 
1 STOP
SEA
Seattle/Tacoma Intl
30 Aug - 13 Sep
$441pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
YYZ
Toronto Pearson Intl
YYZ
Toronto Pearson Intl
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl

Seattle/Tacoma Intl to Ontario 2022 flight deals

Cheap flights to Ontario from Seattle found for this year
14 Dec - 26 Jan
$313pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
YYZ
Toronto Pearson Intl
YYZ
Toronto Pearson Intl
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
3 Dec - 13 Dec
$329pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
YYZ
Toronto Pearson Intl
YYZ
Toronto Pearson Intl
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
16 Nov - 21 Nov
$357pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
YYZ
Toronto Pearson Intl
YYZ
Toronto Pearson Intl
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl

Cheap Air Canada flights from Seattle to Ontario

12 Aug - 15 Aug
$426pp
SEA
Seattle/Tacoma Intl
Air Canada
   
2 STOPS
YOW
Ottawa
YOW
Ottawa
Air Canada
   
2 STOPS
SEA
Seattle/Tacoma Intl
12 Aug - 15 Aug
$431pp
SEA
Seattle/Tacoma Intl
Air Canada
   
2 STOPS
YOW
Ottawa
YOW
Ottawa
Air Canada
 
1 STOP
SEA
Seattle/Tacoma Intl
16 Aug - 30 Aug
$445pp
SEA
Seattle/Tacoma Intl
Air Canada
 
1 STOP
YOW
Ottawa
YOW
Ottawa
Air Canada
   
2 STOPS
SEA
Seattle/Tacoma Intl

Cheap Delta flights from Seattle to Ontario

12 Jul - 19 Jul
$669pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
YYZ
Toronto Pearson Intl
YYZ
Toronto Pearson Intl
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl
17 Jul - 24 Jul
$778pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
YYZ
Toronto Pearson Intl
YYZ
Toronto Pearson Intl
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl
13 Jul - 22 Jul
$781pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
YYZ
Toronto Pearson Intl
YYZ
Toronto Pearson Intl
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl

Non-stop flights to Ontario from Seattle

Save time with Seattle to Ontario direct flight deals
26 Oct - 2 Nov
$490pp
SEA
Seattle/Tacoma Intl
Air Canada
Non-Stop
YYZ
Toronto Pearson Intl
YYZ
Toronto Pearson Intl
Air Canada
Non-Stop
SEA
Seattle/Tacoma Intl
24 Sep - 3 Oct
$492pp
SEA
Seattle/Tacoma Intl
Air Canada
Non-Stop
YYZ
Toronto Pearson Intl
YYZ
Toronto Pearson Intl
Air Canada
Non-Stop
SEA
Seattle/Tacoma Intl
14 Dec - 26 Jan
$502pp
SEA
Seattle/Tacoma Intl
Air Canada
Non-Stop
YYZ
Toronto Pearson Intl
YYZ
Toronto Pearson Intl
Air Canada
Non-Stop
SEA
Seattle/Tacoma Intl

Last minute flights from Seattle to Ontario

Late deals on round-trip flights to Ontario from Seattle, departing today and this week
12 Jul - 19 Jul
$669pp
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
YYZ
Toronto Pearson Intl
YYZ
Toronto Pearson Intl
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl
12 Jul - 13 Jul
$698pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
YYZ
Toronto Pearson Intl
YYZ
Toronto Pearson Intl
Delta
 
1 STOP
SEA
Seattle/Tacoma Intl
14 Jul - 26 Jul
$703pp
SEA
Seattle/Tacoma Intl
Air Canada
   
2 STOPS
YYZ
Toronto Pearson Intl
YYZ
Toronto Pearson Intl
Air Canada
   
2 STOPS
SEA
Seattle/Tacoma Intl

One-way flights to Ontario from Seattle

The cheapest one-way flights from Seattle to Ontario
9:08 am - 1:40 pm
Multiple Airlines
1 Stop
25h 32m
SEA - YHM
Multiple Airlines
$153
Gotogate
2:00 am - 7:35 pm
Multiple Airlines
1 Stop
14h 35m
SEA - YYZ
Multiple Airlines
$181
mytrip.com
3:00 pm - 2:05 am
Multiple Airlines
1 Stop
8h 05m
SEA - YYZ
Multiple Airlines
$184
Kiwi.com

Related info for your journey

Useful info, stats and facts about <span class="emphasized">Seattle</span> to <span class="emphasized">Ontario</span> flights.

Flight FAQs

From Seattle to Ontario

What airport do you fly from for flights from Seattle to Ontario?

For a flight from Seattle to Ontario, you will be flying from Seattle/Tacoma Intl. Seattle/Tacoma Intl (SEA) is just 11.4 mi from the center of the city.

Which airlines flying from Seattle/Tacoma Intl to Ontario have flexible cancellations due to COVID-19?

Due to the rapidly changing circumstances due to COVID-19, airlines like Air Canada, United Airlines, and Delta flying from Seattle/Tacoma Intl to Ontario have implemented new flexible cancellation policies.

Can I find flights from Seattle to Region of Ontario for under $400 on Cheapflights?

Yes, there are multiple flights from Seattle to Region of Ontario for under $400. The cheapest flight booked recently is on Multiple Airlines for just $313, but on average you can expect to pay $379.

Are there nonstop flights from Seattle to Region of Ontario for under $500 on Cheapflights?

Cheapflights has at least 20 direct flights from Seattle to Region of Ontario under $500. A good price for a nonstop flight from Seattle to Region of Ontario is less than $608.

Are there last-minute flights available from Seattle to Region of Ontario for under $700?

There are currently 20+ open flights from Seattle to Region of Ontario within the next 7 days for less than $700.

What are the most reliable airlines from Seattle to Region of Ontario?

The top 3 most reliable airlines when flying from Seattle to Region of Ontario are Turkish Airlines (46%), Air Canada (43%) and United Airlines (43%).

What are the most popular routes from Seattle to Region of Ontario?

The most popular route from Seattle to Region of Ontario is Seattle/Tacoma Intl - Toronto Pearson Intl. You may also consider Seattle/Tacoma Intl - Ottawa or Seattle/Tacoma Intl - Toronto Island.

What are the cheapest flights from Seattle to Region of Ontario?

Looking for the cheapest flight from Seattle to Region of Ontario? While on average our users pay $989, our data indicates the cheapest price to be $251. The most popular route (Seattle/Tacoma Intl - Toronto Pearson Intl), is priced around $329.

What are the most popular airlines that fly from Seattle to Region of Ontario?

The most popular airlines flying from Seattle to Region of Ontario are Interjet, Major Airline and American Airlines. Something to consider prior to booking your flight.

COVID Restrictions

View COVID Travel Restrictions for Ontario, Canada

Do I need a COVID test to fly to Ontario from Seattle?

Information is based on travel restrictions from Seattle/Tacoma Intl to Ontario

Most visitors from Seattle/Tacoma Intl need to provide a negative COVID-19 test result and/or quarantine to enter Ontario.

COVID-19 testing requirements
Visitors from Seattle/Tacoma Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours for RT-PCR (NAAT) and 1 day for Antigen (quick-test) before departing to Ontario.

Quarantine requirements
Visitors from Seattle/Tacoma Intl are not required to quarantine after entering Ontario.

Do I need a test to fly back to Seattle from Ontario?

Returning to Seattle/Tacoma Intl from Ontario

COVID-19 testing requirements
Visitors from Ontario are not required to present a negative COVID-19 PCR test or antigen result upon entering Seattle/Tacoma Intl.

Quarantine requirements
Visitors from Ontario are not required to quarantine after entering Seattle/Tacoma Intl.

Hide COVID Travel Restrictions for Ontario, Canada

Destination points for flights from Seattle to Ontario

Select to see more specific information for flights from Seattle to all places in Ontario.

Top 7 airlines flying from Seattle/Tacoma Intl to Ontario

The chart below displays the airlines Cheapflights users traveling from Seattle to Ontario choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
Juneyao Airlines
$14 $22 No cancel fee 66%

We couldn't confirm the COVID-19 safety measures taken by Juneyao Airlines. Please check directly on their website for additional information.

American Airlines
$140 $381 No cancel fee 71%
Air Canada
$197 $568 No cancel fee 67%
Alaska Airlines
$205 $683 No cancel fee 75%
WestJet
$216 $479 No cancel fee 60%
United Airlines
$224 $556 No cancel fee 69%
Delta
$453 $641 No cancel fee N/A
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