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Cheap flights from Hamilton, Ontario to Seattle from C$ 249

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Hamilton, Ontario to Seattle departing on 26/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult

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Find the cheapest flights from Hamilton, Ontario to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
6:10 p.m. - 9:40 a.m.
YHM
-
SEA
18h 30m
1 stop
WestJet Logo
10:30 a.m. - 5:15 p.m.
SEA
-
YHM
27h 45m
1 stop
C$ 444WestJet
Fri, 5 Jun - Tue, 9 Jun
WestJet Logo
6:10 p.m. - 9:40 a.m.
YHM
-
SEA
18h 30m
1 stop
WestJet Logo
7:00 a.m. - 5:15 p.m.
SEA
-
YHM
7h 15m
1 stop
C$ 458WestJet
Wed, 22 Jul - Mon, 27 Jul
WestJet Logo
6:10 p.m. - 9:40 a.m.
YHM
-
SEA
18h 30m
1 stop
WestJet Logo
7:00 a.m. - 5:15 p.m.
SEA
-
YHM
7h 15m
1 stop
C$ 459WestJet
Sat, 27 Jun - Sat, 4 Jul
WestJet Logo
6:10 p.m. - 9:40 a.m.
YHM
-
SEA
18h 30m
1 stop
WestJet Logo
7:00 a.m. - 5:15 p.m.
SEA
-
YHM
7h 15m
1 stop
C$ 463WestJet
Tue, 18 Aug - Tue, 25 Aug
WestJet Logo
6:10 p.m. - 9:40 a.m.
YHM
-
SEA
18h 30m
1 stop
WestJet Logo
7:00 a.m. - 5:15 p.m.
SEA
-
YHM
7h 15m
1 stop
C$ 464WestJet
Mon, 20 Jul - Mon, 27 Jul
WestJet Logo
6:10 p.m. - 9:40 a.m.
YHM
-
SEA
18h 30m
1 stop
WestJet Logo
7:00 a.m. - 5:15 p.m.
SEA
-
YHM
7h 15m
1 stop
C$ 467WestJet
Wed, 22 Jul - Mon, 27 Jul
WestJet Logo
6:10 p.m. - 9:40 a.m.
YHM
-
SEA
18h 30m
1 stop
WestJet Logo
7:00 a.m. - 5:15 p.m.
SEA
-
YHM
7h 15m
1 stop
C$ 471WestJet
Wed, 22 Jul - Sun, 26 Jul
WestJet Logo
6:10 p.m. - 9:00 p.m.
YHM
-
SEA
29h 50m
1 stop
WestJet Logo
7:00 a.m. - 5:15 p.m.
SEA
-
YHM
7h 15m
1 stop
C$ 474WestJet
Wed, 22 Jul - Sun, 26 Jul
WestJet Logo
6:10 p.m. - 9:00 p.m.
YHM
-
SEA
29h 50m
1 stop
WestJet Logo
7:00 a.m. - 5:15 p.m.
SEA
-
YHM
7h 15m
1 stop
C$ 475WestJet
Fri, 10 Jul - Sun, 19 Jul
WestJet Logo
6:10 p.m. - 9:00 p.m.
YHM
-
SEA
29h 50m
1 stop
WestJet Logo
7:00 a.m. - 5:15 p.m.
SEA
-
YHM
7h 15m
1 stop
C$ 484WestJet
Fri, 17 Jul - Sun, 19 Jul

WestJet flights from Hamilton, Ontario to Seattle

Our best WestJet deals on Hamilton, Ontario to Seattle flight tickets
WestJet
5 Jun
YHM6:10 p.m.Hamilton
18h 30m
1 stop
SEA9:40 a.m.Seattle/Tacoma Intl
9 Jun
SEA10:30 a.m.Seattle/Tacoma Intl
27h 45m
1 stop
YHM5:15 p.m.Hamilton
C$ 444
WestJet
22 Jul
YHM6:10 p.m.Hamilton
18h 30m
1 stop
SEA9:40 a.m.Seattle/Tacoma Intl
27 Jul
SEA7:00 a.m.Seattle/Tacoma Intl
7h 15m
1 stop
YHM5:15 p.m.Hamilton
C$ 458
WestJet
27 Jun
YHM6:10 p.m.Hamilton
18h 30m
1 stop
SEA9:40 a.m.Seattle/Tacoma Intl
4 Jul
SEA7:00 a.m.Seattle/Tacoma Intl
7h 15m
1 stop
YHM5:15 p.m.Hamilton
C$ 459

momondo Fare Finder

 
Customize your flight search to find flights from Hamilton, Ontario to Seattle 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 96,600 searches. Data last updated 14 May 2026.
Use the filters below to find and compare flights from Hamilton, Ontario to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Fri 5/6

6:10 p.m.-9:40 a.m.

1 stop18h 30m

Seattle/Tacoma Intl

Tue 9/6

10:30 a.m.-5:15 p.m.

1 stop27h 45m

C$ 444
Quickest round-trip

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 22/7

6:10 p.m.-9:40 a.m.

1 stop18h 30m

Seattle/Tacoma Intl

Mon 27/7

7:00 a.m.-5:15 p.m.

1 stop7h 15m

C$ 458

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Sat 27/6

6:10 p.m.-9:40 a.m.

1 stop18h 30m

Seattle/Tacoma Intl

Sat 4/7

7:00 a.m.-5:15 p.m.

1 stop7h 15m

C$ 459

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Tue 18/8

6:10 p.m.-9:40 a.m.

1 stop18h 30m

Seattle/Tacoma Intl

Tue 25/8

7:00 a.m.-5:15 p.m.

1 stop7h 15m

C$ 463

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Mon 20/7

6:10 p.m.-9:40 a.m.

1 stop18h 30m

Seattle/Tacoma Intl

Mon 27/7

7:00 a.m.-5:15 p.m.

1 stop7h 15m

C$ 464

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 22/7

6:10 p.m.-9:40 a.m.

1 stop18h 30m

Seattle/Tacoma Intl

Mon 27/7

7:00 a.m.-5:15 p.m.

1 stop7h 15m

C$ 467

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 22/7

6:10 p.m.-9:40 a.m.

1 stop18h 30m

Seattle/Tacoma Intl

Sun 26/7

7:00 a.m.-5:15 p.m.

1 stop7h 15m

C$ 471

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 22/7

6:10 p.m.-9:00 p.m.

1 stop29h 50m

Seattle/Tacoma Intl

Sun 26/7

7:00 a.m.-5:15 p.m.

1 stop7h 15m

C$ 474

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Fri 10/7

6:10 p.m.-9:00 p.m.

1 stop29h 50m

Seattle/Tacoma Intl

Sun 19/7

7:00 a.m.-5:15 p.m.

1 stop7h 15m

C$ 475

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Fri 17/7

6:10 p.m.-9:00 p.m.

1 stop29h 50m

Seattle/Tacoma Intl

Sun 19/7

7:00 a.m.-5:15 p.m.

1 stop7h 15m

C$ 484

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 Seattle from

How to get the cheapest flight ticket from Hamilton, 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 day to depart on your flight to Seattle?

Our data shows that Thursday is the least expensive day to fly to Seattle. Tickets to fly out on this day can be as low as C$ 538. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around C$ 803. 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 Hamilton, Ontario to Seattle during this time can be as low as C$ 510. Flights in the morning are often more expensive with an average ticket price of C$ 914.

When to book flights from Hamilton, Ontario to Seattle

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

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

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

Fastest flight time

8h 25m

Direct flights

None
The fastest flight from Hamilton, Ontario to Seattle takes 8h 25m
There are no direct flights from Hamilton, Ontario to Seattle. There are no popular flight routes from Hamilton, Ontario to Seattle.
Search flight deals

Frequently asked questions about flying from Hamilton, Ontario to Seattle

  • How far is Hamilton to Seattle/Tacoma Intl by plane?

    Seattle/Tacoma Intl is 3306.3 km away from Hamilton. Typically, this will take 8h 25m by plane in normal conditions.

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

    Prices for flights from Hamilton Airport to Seattle/Tacoma Intl Airport were last updated today.

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Hamilton Airport 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.

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Lynnwood
Leavenworth
SeaTac
Redmond
Marysville
Kirkland
Woodinville
Tacoma
Puyallup
Tukwila
Olympia
Ocean Shores
Ellensburg
Bainbridge Island
Gig Harbor
Renton
Kent
Edmonds
Centralia
Shelton

Why use momondo?

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

Finding the right flight to Seattle from Hamilton is quick and easy when you have a range of options in front of you, from reputable agents and recognizable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Seattle quick and easy, saving you time and money.

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

Yes. All flights to Seattle from Hamilton on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo helps you find the best flight between Hamilton and Seattle 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 Hamilton to Seattle right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Hamilton to Seattle flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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