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Cheap flights from Seattle to Toronto from $131

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 4/28. 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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Find the cheapest flights from Seattle to Toronto

Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
7:35 pm - 5:15 pm
SEA
-
YHM
18h 40m
1 stop
WestJet Logo
6:10 pm - 9:40 am
YHM
-
SEA
18h 30m
1 stop
$304WestJet
Sat, May 16 - Sat, May 30
WestJet Logo
3:10 pm - 5:16 pm
SEA
-
YHM
23h 06m
1 stop
WestJet Logo
6:10 pm - 2:19 pm
YHM
-
SEA
23h 09m
1 stop
$307WestJet
Wed, Apr 1 - Wed, Apr 8
WestJet Logo
3:20 pm - 5:15 pm
SEA
-
YHM
22h 55m
1 stop
WestJet Logo
6:10 pm - 9:40 am
YHM
-
SEA
18h 30m
1 stop
$308WestJet
Sat, Apr 25 - Sat, May 2
WestJet Logo
3:20 pm - 5:15 pm
SEA
-
YHM
22h 55m
1 stop
WestJet Logo
6:10 pm - 9:40 am
YHM
-
SEA
18h 30m
1 stop
$313WestJet
Sat, Apr 25 - Sat, May 2
WestJet Logo
3:20 pm - 5:15 pm
SEA
-
YHM
22h 55m
1 stop
WestJet Logo
6:10 pm - 9:40 am
YHM
-
SEA
18h 30m
1 stop
$314WestJet
Sat, Apr 25 - Sat, May 2
WestJet Logo
7:35 pm - 5:15 pm
SEA
-
YHM
18h 40m
1 stop
WestJet Logo
6:10 pm - 9:40 am
YHM
-
SEA
18h 30m
1 stop
$338WestJet
Sat, May 2 - Tue, May 5
WestJet Logo
7:35 pm - 5:15 pm
SEA
-
YHM
18h 40m
1 stop
WestJet Logo
6:10 pm - 9:40 am
YHM
-
SEA
18h 30m
1 stop
$344WestJet
Fri, May 8 - Tue, May 19
WestJet Logo
10:30 am - 5:15 pm
SEA
-
YHM
27h 45m
1 stop
WestJet Logo
6:10 pm - 9:40 am
YHM
-
SEA
18h 30m
1 stop
$346WestJet
Tue, Jun 2 - Tue, Jun 9
WestJet Logo
7:00 am - 5:15 pm
SEA
-
YHM
7h 15m
1 stop
WestJet Logo
6:10 pm - 6:45 pm
YHM
-
SEA
27h 35m
1 stop
$354WestJet
Wed, Jun 17 - Sun, Jun 21
WestJet Logo
7:35 pm - 5:15 pm
SEA
-
YHM
18h 40m
1 stop
WestJet Logo
6:10 pm - 9:40 am
YHM
-
SEA
18h 30m
1 stop
$358WestJet
Fri, Jun 12 - Sun, Jun 14

WestJet flights from Seattle to Hamilton, Ontario

Our best WestJet deals on Seattle to Hamilton, Ontario flight tickets
WestJet
May 16
SEA7:35 pmSeattle/Tacoma Intl
18h 40m
1 stop
YHM5:15 pmHamilton
May 30
YHM6:10 pmHamilton
18h 30m
1 stop
SEA9:40 amSeattle/Tacoma Intl
$304
WestJet
Apr 1
SEA3:10 pmSeattle/Tacoma Intl
23h 06m
1 stop
YHM5:16 pmHamilton
Apr 8
YHM6:10 pmHamilton
23h 09m
1 stop
SEA2:19 pmSeattle/Tacoma Intl
$307
WestJet
Apr 25
SEA3:20 pmSeattle/Tacoma Intl
22h 55m
1 stop
YHM5:15 pmHamilton
May 2
YHM6:10 pmHamilton
18h 30m
1 stop
SEA9:40 amSeattle/Tacoma Intl
$308

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 March 9, 2026.
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

Cheapest round-trip

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 5/16

7:35 pm-5:15 pm

1 stop18h 40m

Hamilton

Sat 5/30

6:10 pm-9:40 am

1 stop18h 30m

$304

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Wed 4/1

3:10 pm-5:16 pm

1 stop23h 06m

Hamilton

Wed 4/8

6:10 pm-2:19 pm

1 stop23h 09m

$307

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 4/25

3:20 pm-5:15 pm

1 stop22h 55m

Hamilton

Sat 5/2

6:10 pm-9:40 am

1 stop18h 30m

$308

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 4/25

3:20 pm-5:15 pm

1 stop22h 55m

Hamilton

Sat 5/2

6:10 pm-9:40 am

1 stop18h 30m

$313

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 4/25

3:20 pm-5:15 pm

1 stop22h 55m

Hamilton

Sat 5/2

6:10 pm-9:40 am

1 stop18h 30m

$314

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 5/2

7:35 pm-5:15 pm

1 stop18h 40m

Hamilton

Tue 5/5

6:10 pm-9:40 am

1 stop18h 30m

$338

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 5/8

7:35 pm-5:15 pm

1 stop18h 40m

Hamilton

Tue 5/19

6:10 pm-9:40 am

1 stop18h 30m

$344

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 6/2

10:30 am-5:15 pm

1 stop27h 45m

Hamilton

Tue 6/9

6:10 pm-9:40 am

1 stop18h 30m

$346
Quickest round-trip

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Wed 6/17

7:00 am-5:15 pm

1 stop7h 15m

Hamilton

Sun 6/21

6:10 pm-6:45 pm

1 stop27h 35m

$354

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 6/12

7:35 pm-5:15 pm

1 stop18h 40m

Hamilton

Sun 6/14

6:10 pm-9:40 am

1 stop18h 30m

$358

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 58% 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

Fastest flight time

7h 15m

Direct flights

None
The fastest flight from Seattle to Hamilton, Ontario takes 7h 15m
There are no direct flights from Seattle to Hamilton, Ontario. There are no popular flight routes from Seattle to Hamilton, Ontario.
Search flight deals

  • 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 15m.

  • 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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