Cheap flights from Ontario to Seattle from C$ 301
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Seattle departing on 22/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Find the cheapest flights from Ontario to Seattle
Cheap round-trip flights
Cheap one-way flights
Cheap last-minute flights
Cheap direct flights
Save money when you book flights with momondo
Big names, great deals
Big names, great deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Early arrival? Instantly customize your resultsTrusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.WestJet flights from Region of Ontario to Seattle
Our best WestJet deals on Region of Ontario to Seattle flight tickets
Air Canada flights from Region of Ontario to Seattle
Our best Air Canada deals on Region of Ontario to Seattle flight tickets
momondo Fare Finder
Use the filters below to find and compare flights from Ontario to Seattle that are best for you.
Fly from
Fly to
Route
Depart
Return
TorontoSeattle
YYZ Toronto Pearson Intl - SEA Seattle/Tacoma Intl
YYZSEA
Toronto Pearson Intl
Thu 26/11
7:30 a.m.-1:40 p.m.
1 stop9h 10m
Seattle/Tacoma Intl
Thu 3/12
2:30 p.m.-5:45 a.m.
2 stops12h 15m
TorontoSeattle
YYZ Toronto Pearson Intl - SEA Seattle/Tacoma Intl
YYZSEA
Toronto Pearson Intl
Wed 25/11
7:30 a.m.-1:40 p.m.
1 stop9h 10m
Seattle/Tacoma Intl
Mon 30/11
2:30 p.m.-5:45 a.m.
2 stops12h 15m
TorontoSeattle
YYZ Toronto Pearson Intl - SEA Seattle/Tacoma Intl
YYZSEA
Toronto Pearson Intl
Fri 8/1
7:30 a.m.-1:40 p.m.
1 stop9h 10m
Seattle/Tacoma Intl
Mon 18/1
10:09 a.m.-6:50 a.m.
1 stop17h 41m
TorontoSeattle
YYZ Toronto Pearson Intl - SEA Seattle/Tacoma Intl
YYZSEA
Toronto Pearson Intl
Sat 7/11
12:10 p.m.-6:35 p.m.
1 stop9h 25m
Seattle/Tacoma Intl
Sat 14/11
11:40 p.m.-11:09 a.m.
1 stop8h 29m
TorontoSeattle
YYZ Toronto Pearson Intl - SEA Seattle/Tacoma Intl
YYZSEA
Toronto Pearson Intl
Wed 11/11
6:00 a.m.-2:50 p.m.
1 stop11h 50m
Seattle/Tacoma Intl
Wed 2/12
9:50 a.m.-11:07 p.m.
1 stop10h 17m
TorontoSeattle
YYZ Toronto Pearson Intl - SEA Seattle/Tacoma Intl
YYZSEA
Toronto Pearson Intl
Sat 14/11
12:15 p.m.-6:37 p.m.
1 stop9h 22m
Seattle/Tacoma Intl
Wed 18/11
10:52 p.m.-11:19 a.m.
1 stop9h 27m
OttawaSeattle
YOW Ottawa - SEA Seattle/Tacoma Intl
YOWSEA
Ottawa
Thu 3/12
7:45 a.m.-2:37 p.m.
1 stop9h 52m
Seattle/Tacoma Intl
Tue 8/12
7:45 a.m.-6:45 p.m.
1 stop8h 00m
OttawaSeattle
YOW Ottawa - SEA Seattle/Tacoma Intl
YOWSEA
Ottawa
Thu 19/11
7:45 a.m.-2:37 p.m.
1 stop9h 52m
Seattle/Tacoma Intl
Mon 23/11
7:45 a.m.-7:45 p.m.
1 stop9h 00m
TorontoSeattle
YYZ Toronto Pearson Intl - SEA Seattle/Tacoma Intl
YYZSEA
Toronto Pearson Intl
Sat 14/11
7:35 a.m.-2:30 p.m.
1 stop9h 55m
Seattle/Tacoma Intl
Sun 22/11
8:31 a.m.-4:05 p.m.
Nonstop4h 34m
TorontoSeattle
YYZ Toronto Pearson Intl - SEA Seattle/Tacoma Intl
YYZSEA
Toronto Pearson Intl
Sat 14/11
5:15 p.m.-7:45 p.m.
Nonstop5h 30m
Seattle/Tacoma Intl
Wed 18/11
8:19 a.m.-4:05 p.m.
Nonstop4h 46m
See travel insights to Seattle from
How to get the cheapest flight ticket from Region of Ontario to Seattle
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Seattle?
If you aren’t able to travel to Seattle during the month of February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of C$ 394.
What is the cheapest day to depart on your flight to Seattle?
Our data shows that Friday is the least expensive day to fly to Seattle. Tickets to fly out on this day can be as low as C$ 561. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around C$ 1,012. These prices are subject to change though, so be sure to set up a Price Alert for flights to Seattle.
What is the cheapest time of day to depart on your flight to Seattle?
Our most recent data shows that the best time of day to fly to Seattle is in the evening. Flights from Region of Ontario to Seattle during this time can be as low as C$ 530. Flights in the morning are often more expensive with an average ticket price of C$ 1,342.
What is the cheapest Ontario to Seattle/Tacoma Intl flight route?
Fly from Toronto Pearson Intl to Seattle/Tacoma Intl for the best Ontario - Seattle/Tacoma Intl flight prices
How far in advance should I book a flight from Ontario to Seattle?
You are more likely to see cheaper flights to Seattle from Region of Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around C$ 553 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Region of Ontario for as low as C$ 432 on momondo.
What cabin class options are available on Region of Ontario to Seattle flights?
There are 4 cabin classes available to choose from on Region of Ontario to Seattle flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Ontario to Seattle/Tacoma Intl?
WestJet, Delta, and Air Canada are the most popular carriers operating from Ontario to Seattle/Tacoma Intl
Which airlines fly to Seattle?
WestJet, Air Canada and Alaska Airlines are the top three most popular airlines that fly to Seattle from Region of Ontario according to our data. WestJet is the first choice among our users, with 32% of people opting to fly with this airline when travelling to Seattle. Keep in mind that there are 5 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.
How many flights depart from Region of Ontario to Seattle on average per day?
The number of flights available between Region of Ontario and Seattle is 2 per day as of October 2026. The most frequent departure time is 6:00p.m., with 75% of daily flights leaving in the evening.
How many flights depart from Region of Ontario to Seattle on average per week?
The number of flights available between Region of Ontario and Seattle is 15 per week as of October 2026. The most frequent departure day is Mon, with 27% of weekly flights leaving on this day.
Cheap Region of Ontario to Seattle flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Region of Ontario to Seattle
Frequently asked questions about flying from Ontario to Seattle
When did momondo last update prices for flights from Ontario to Seattle/Tacoma Intl Airport?
Prices for flights from Ontario to Seattle/Tacoma Intl Airport are updated daily.
How many operators does momondo search for flights from Ontario to Seattle/Tacoma Intl Airport?
The number of operators available for flights from Ontario to Seattle/Tacoma Intl Airport is 5 as of October 2026.
How old do you have to be to fly from Ontario to Seattle/Tacoma Intl Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Region of Ontario to Seattle?
Based on momondo bookings for flights between Region of Ontario and Seattle, the leading plane model is Boeing 737 MAX 9, making up 32.82% of the total bookings. Other popular models include Airbus A220-300 with 20.25%, Boeing 777-300ER with 9.51%, and Boeing 737 MAX 8 with 7.98%.
Best airlines flying from Region of Ontario to Seattle
Compare and see reviews for airlines that fly from Region of Ontario to Seattle with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom C$ 231 | Free Cancellation | Rating 7.8 8,653 reviews | |||
| PriceFrom C$ 258 | Free Cancellation | Rating 7.1 11,758 reviews | |||
| PriceFrom C$ 260 | Free Cancellation | Rating 7.4 10,350 reviews | |||
| PriceFrom C$ 276 | Free Cancellation | Rating 7.9 13,052 reviews | |||
| PriceFrom C$ 305 | Free Cancellation | Rating 7.2 3,448 reviews |
Travelling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Ontario to Seattle?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Ontario to Seattle for you.
Can I find flights from Ontario to Seattle with flexible booking policies on momondo?
Yes. momondo enables you to select and highlight flights to Seattle from Ontario with this policy.
How can momondo help me find flights from Ontario to Seattle?
Once you have performed a search for Ontario to Seattle flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.
I’m not ready to book a flight from Ontario to Seattle right now. Can momondo alert me if prices change?
If you are not ready to book a flight from Ontario to Seattle now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Seattle and let you know when they change.