Cheap flights from Seattle to Toronto from $122

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Toronto departing on 3/29. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

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Multiple Airlines Logo
5:50 am - 7:00 pmSEA-YHM
10h 10m1 stop
Multiple Airlines Logo
8:15 am - 7:16 pmYHM-SEA
14h 01m1 stop
$378Multiple Airlines
Find Deal
Fri, Nov 21 - Sun, Nov 23
Multiple Airlines Logo
5:50 am - 7:00 pmSEA-YHM
10h 10m1 stop
Multiple Airlines Logo
8:15 am - 2:31 pmYHM-SEA
9h 16m1 stop
$391Multiple Airlines
Find Deal
Sat, Nov 15 - Sat, Nov 22
Multiple Airlines Logo
5:50 am - 7:00 pmSEA-YHM
10h 10m1 stop
Multiple Airlines Logo
8:15 am - 7:16 pmYHM-SEA
14h 01m1 stop
$393Multiple Airlines
Find Deal
Sat, Nov 15 - Sat, Nov 22
WestJet Logo
3:10 pm - 5:17 pmSEA-YHM
23h 07m1 stop
WestJet Logo
6:10 pm - 2:20 pmYHM-SEA
23h 10m1 stop
$403WestJet
Find Deal
Sun, Nov 30 - Sun, Dec 7
WestJet Logo
3:10 pm - 5:17 pmSEA-YHM
23h 07m1 stop
WestJet Logo
6:10 pm - 2:20 pmYHM-SEA
23h 10m1 stop
$410WestJet
Find Deal
Sun, Nov 30 - Sun, Dec 7
Multiple Airlines Logo
5:45 am - 7:00 pmSEA-YHM
10h 15m1 stop
Multiple Airlines Logo
8:15 am - 7:16 pmYHM-SEA
14h 01m1 stop
$415Multiple Airlines
Find Deal
Mon, Dec 1 - Mon, Dec 8
Multiple Airlines Logo
5:50 am - 7:00 pmSEA-YHM
10h 10m1 stop
Multiple Airlines Logo
8:15 am - 7:16 pmYHM-SEA
14h 01m1 stop
$421Multiple Airlines
Find Deal
Sat, Nov 15 - Sat, Nov 22
WestJet Logo
3:10 pm - 5:17 pmSEA-YHM
23h 07m1 stop
WestJet Logo
6:10 pm - 2:20 pmYHM-SEA
23h 10m1 stop
$422WestJet
Find Deal
Sun, Nov 30 - Sun, Dec 7
Multiple Airlines Logo
5:50 am - 7:00 pmSEA-YHM
10h 10m1 stop
Multiple Airlines Logo
8:15 am - 7:16 pmYHM-SEA
14h 01m1 stop
$429Multiple Airlines
Find Deal
Sun, Nov 16 - Sun, Nov 23
Multiple Airlines Logo
5:50 am - 7:00 pmSEA-YHM
10h 10m1 stop
Multiple Airlines Logo
8:15 am - 2:31 pmYHM-SEA
9h 16m1 stop
$440Multiple Airlines
Find Deal
Sat, Nov 15 - Sat, Nov 22

WestJet flights from Seattle to Hamilton, Ontario

Our best WestJet deals on Seattle to Hamilton, Ontario flight tickets
WestJet
Oct 21
SEA7:05 amSeattle/Tacoma Intl
14h 35m
1 stop
YHM12:40 amHamilton
Oct 25
YHM6:00 amHamilton
9h 59m
1 stop
SEA12:59 pmSeattle/Tacoma Intl
WestJet
Nov 30
SEA3:10 pmSeattle/Tacoma Intl
23h 07m
1 stop
YHM5:17 pmHamilton
Dec 7
YHM6:10 pmHamilton
23h 10m
1 stop
SEA2:20 pmSeattle/Tacoma Intl
WestJet
Nov 30
SEA3:10 pmSeattle/Tacoma Intl
23h 07m
1 stop
YHM5:17 pmHamilton
Dec 7
YHM6:10 pmHamilton
23h 10m
1 stop
SEA2:20 pmSeattle/Tacoma Intl

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Hamilton, Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated October 17, 2025.
Use the filters below to find and compare flights from Seattle to Hamilton, Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 11/21

5:50 am-7:00 pm

1 stop10h 10m

Hamilton

Sun 11/23

8:15 am-7:16 pm

1 stop14h 01m

$378

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 11/15

5:50 am-7:00 pm

1 stop10h 10m

Hamilton

Sat 11/22

8:15 am-2:31 pm

1 stop9h 16m

$391

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 11/15

5:50 am-7:00 pm

1 stop10h 10m

Hamilton

Sat 11/22

8:15 am-7:16 pm

1 stop14h 01m

$393

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 11/30

3:10 pm-5:17 pm

1 stop23h 07m

Hamilton

Sun 12/7

6:10 pm-2:20 pm

1 stop23h 10m

$403

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 11/30

3:10 pm-5:17 pm

1 stop23h 07m

Hamilton

Sun 12/7

6:10 pm-2:20 pm

1 stop23h 10m

$410

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Mon 12/1

5:45 am-7:00 pm

1 stop10h 15m

Hamilton

Mon 12/8

8:15 am-7:16 pm

1 stop14h 01m

$415

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 11/15

5:50 am-7:00 pm

1 stop10h 10m

Hamilton

Sat 11/22

8:15 am-7:16 pm

1 stop14h 01m

$421

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 11/30

3:10 pm-5:17 pm

1 stop23h 07m

Hamilton

Sun 12/7

6:10 pm-2:20 pm

1 stop23h 10m

$422

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 11/16

5:50 am-7:00 pm

1 stop10h 10m

Hamilton

Sun 11/23

8:15 am-7:16 pm

1 stop14h 01m

$429

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 11/15

5:50 am-7:00 pm

1 stop10h 10m

Hamilton

Sat 11/22

8:15 am-2:31 pm

1 stop9h 16m

$440

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Toronto from

How to get the cheapest flight ticket from Seattle to Hamilton, Ontario

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 airline that flies from Seattle/Tacoma Intl to Hamilton?

WestJet is the most popular carrier operating from Seattle/Tacoma Intl to Hamilton

What airlines fly to Hamilton, Ontario?

Alaska Airlines, Air Canada and WestJet are the top three most popular airlines that fly to Hamilton, Ontario from Seattle according to our data. Alaska Airlines is the first choice among our users, with 55% of people opting to fly with this airline when traveling to Hamilton, Ontario. Keep in mind that there are 5 different airlines that fly to Hamilton, Ontario on a routine basis, so you have a few additional options to choose from.

When to book flights from Seattle to Hamilton, Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Hamilton, Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to Hamilton, Ontario (SEA to YHM) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Hamilton, Ontario

Direct flights

None
There are no direct flights from Seattle to Hamilton, Ontario. There are no popular flight routes from Seattle to Hamilton, Ontario.
  • How far is Seattle/Tacoma Intl to Hamilton by plane?

    The distance between Seattle/Tacoma Intl and Hamilton is about 2054.4 mi. A reasonable flight in good conditions will take 7h 10m.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Hamilton Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Hamilton Airport are updated daily.

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Hamilton Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Hamilton Airport.

  • What documentation or ID do you need to fly to Hamilton Airport?

    The required travel and health documents for your Hamilton Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Hamilton Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Hamilton?

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 Seattle to Hamilton for you.

Can I find flights from Seattle to Hamilton with flexible booking policies on momondo?

All flight searches from Seattle to Hamilton on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Seattle to Hamilton?

momondo helps you find the best flight between Seattle and Hamilton by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Seattle to Hamilton right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Seattle to Hamilton flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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1 adult
Sun 11/16
Sun 11/23

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