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Cheap flights from Hamilton, Ontario to Seattle from C$ 305

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 8/10. 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
1 adult, Economy, 0 bags

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. - 9:00 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$ 515WestJet
Fri, 21 Aug - Sun, 6 Sep
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$ 518WestJet
Thu, 3 Sep - Tue, 8 Sep
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$ 522WestJet
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$ 525WestJet
Mon, 24 Aug - Sat, 29 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$ 528WestJet
Tue, 4 Aug - Fri, 21 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$ 529WestJet
Tue, 18 Aug - Sun, 30 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$ 534WestJet
Thu, 6 Aug - Thu, 20 Aug
WestJet Logo
6:10 p.m. - 2:20 p.m.
YHM
-
SEA
23h 10m
1 stop
WestJet Logo
3:20 p.m. - 5:17 p.m.
SEA
-
YHM
22h 57m
1 stop
C$ 536WestJet
Wed, 28 Oct - Sat, 31 Oct
WestJet Logo
6:10 p.m. - 9:40 a.m.
YHM
-
SEA
18h 30m
1 stop
WestJet Logo
7:35 p.m. - 5:15 p.m.
SEA
-
YHM
18h 40m
1 stop
C$ 545WestJet
Thu, 1 Oct - Mon, 5 Oct
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$ 548WestJet
Wed, 12 Aug - Wed, 19 Aug

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WestJet flights from Hamilton, Ontario to Seattle

Our best WestJet deals on Hamilton, Ontario to Seattle flight tickets
WestJet
21 Aug
YHM6:10 p.m.Hamilton
29h 50m
1 stop
SEA9:00 p.m.Seattle/Tacoma Intl
6 Sep
SEA7:00 a.m.Seattle/Tacoma Intl
7h 15m
1 stop
YHM5:15 p.m.Hamilton
C$ 515
WestJet
3 Sep
YHM6:10 p.m.Hamilton
18h 30m
1 stop
SEA9:40 a.m.Seattle/Tacoma Intl
8 Sep
SEA7:00 a.m.Seattle/Tacoma Intl
7h 15m
1 stop
YHM5:15 p.m.Hamilton
C$ 518
WestJet
18 Aug
YHM6:10 p.m.Hamilton
18h 30m
1 stop
SEA9:40 a.m.Seattle/Tacoma Intl
25 Aug
SEA7:00 a.m.Seattle/Tacoma Intl
7h 15m
1 stop
YHM5:15 p.m.Hamilton
C$ 522

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 28 June 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 21/8

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

1 stop29h 50m

Seattle/Tacoma Intl

Sun 6/9

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

1 stop7h 15m

C$ 515
Quickest round-trip

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Thu 3/9

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

1 stop18h 30m

Seattle/Tacoma Intl

Tue 8/9

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

1 stop7h 15m

C$ 518

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$ 522

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Mon 24/8

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

1 stop18h 30m

Seattle/Tacoma Intl

Sat 29/8

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

1 stop7h 15m

C$ 525

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Tue 4/8

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

1 stop18h 30m

Seattle/Tacoma Intl

Fri 21/8

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

1 stop7h 15m

C$ 528

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Tue 18/8

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

1 stop18h 30m

Seattle/Tacoma Intl

Sun 30/8

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

1 stop7h 15m

C$ 529

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Thu 6/8

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

1 stop18h 30m

Seattle/Tacoma Intl

Thu 20/8

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

1 stop7h 15m

C$ 534

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 28/10

6:10 p.m.-2:20 p.m.

1 stop23h 10m

Seattle/Tacoma Intl

Sat 31/10

3:20 p.m.-5:17 p.m.

1 stop22h 57m

C$ 536

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Thu 1/10

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

1 stop18h 30m

Seattle/Tacoma Intl

Mon 5/10

7:35 p.m.-5:15 p.m.

1 stop18h 40m

C$ 545

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 12/8

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

1 stop18h 30m

Seattle/Tacoma Intl

Wed 19/8

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

1 stop7h 15m

C$ 548

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$ 524. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around C$ 857. 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$ 519. Flights in the morning are often more expensive with an average ticket price of C$ 1,213.

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 33m

Direct flights

None
The fastest flight from Hamilton, Ontario to Seattle takes 8h 33m
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 33m 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
Redmond
Kirkland
SeaTac
Marysville
Tacoma
Woodinville
Puyallup
Tukwila
Olympia
Ocean Shores
Ellensburg
Federal Way
Bainbridge Island
Gig Harbor
Renton
Shoreline
Kent
Edmonds

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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