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Cheap flights from Hamilton, ON to Seattle from C$ 223

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
YHM — SEA
26 Feb — 5 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Hamilton to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from Hamilton to Seattle
Explore the most affordable flight options available from Hamilton to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 January 2026.

Fri 1/56:10 p.m.
YHM
-
SEA
1 stop21h 58m
WestJet
Fri 8/57:05 a.m.
SEA
-
YHM
1 stop7h 05m
WestJet
Deal found 24/1C$ 340
Wed 11/36:10 p.m.
YHM
-
SEA
1 stop23h 09m
WestJet
Tue 17/33:10 p.m.
SEA
-
YHM
1 stop23h 06m
WestJet
Deal found 26/1C$ 381
Wed 20/56:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Thu 21/57:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Deal found 27/1C$ 442
Fri 1/56:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Fri 22/57:35 p.m.
SEA
-
YHM
1 stop18h 35m
WestJet
Deal found 25/1C$ 504
Wed 11/36:10 p.m.
YHM
-
SEA
1 stop23h 09m
Multiple Airlines
Tue 17/311:08 p.m.
SEA
-
YHM
2 stops15h 08m
Multiple Airlines
Deal found 26/1C$ 513
Mon 23/26:10 p.m.
YHM
-
SEA
1 stop23h 09m
WestJet
Thu 5/33:10 p.m.
SEA
-
YHM
1 stop19h 11m
WestJet
Deal found 26/1C$ 520
Wed 11/36:10 p.m.
YHM
-
SEA
1 stop23h 09m
WestJet
Sun 15/33:10 p.m.
SEA
-
YHM
1 stop23h 06m
WestJet
Deal found 26/1C$ 524
Tue 10/35:50 a.m.
YHM
-
SEA
1 stop11h 29m
WestJet
Thu 12/33:10 p.m.
SEA
-
YHM
1 stop19h 11m
WestJet
Deal found 25/1C$ 542
Sun 22/26:10 p.m.
YHM
-
SEA
1 stop23h 09m
WestJet
Sun 1/33:10 p.m.
SEA
-
YHM
1 stop23h 06m
WestJet
Deal found 25/1C$ 575

Find flight deals from Hamilton to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Hamilton (YHM) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 27 January 2026.

Round-trip from

C$ 340

One-way from

C$ 223

Popular in

June

Cheapest in

February

Average price

C$ 545
WestJet
  • WestJet
  • 1/5-8/5
  • 2 total stops
  • 29h 03m total
  • Hamilton to Seattle
Search Deals
WestJet
  • WestJet
  • 9/3
  • 1 total stop
  • 23h 09m total
  • Hamilton to Seattle
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (C$ 61 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Hamilton 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, Cheapflights users made 629,999 searches. Data last updated 27 January 2026.
Use the filters below to find and compare flights from Hamilton to Seattle that are best for you.

Fly from

Hamilton

Fly to

Seattle

Route

Depart

Return

Price

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 11/3

6:10 p.m.-2:19 p.m.

1 stop23h 09m

Seattle/Tacoma Intl

Tue 17/3

3:10 p.m.-5:16 p.m.

1 stop23h 06m

C$ 381

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Fri 8/5

6:10 p.m.-6:45 p.m.

1 stop27h 35m

Seattle/Tacoma Intl

Sat 16/5

7:35 p.m.-5:10 p.m.

1 stop18h 35m

C$ 388

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Sat 2/5

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

1 stop18h 30m

Seattle/Tacoma Intl

Sun 10/5

7:35 p.m.-5:10 p.m.

1 stop18h 35m

C$ 388

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 11/3

6:10 p.m.-2:19 p.m.

1 stop23h 09m

Seattle/Tacoma Intl

Tue 17/3

11:08 p.m.-5:16 p.m.

2 stops15h 08m

C$ 513

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Mon 23/2

6:10 p.m.-2:19 p.m.

1 stop23h 09m

Seattle/Tacoma Intl

Thu 5/3

3:10 p.m.-1:21 p.m.

1 stop19h 11m

C$ 520

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Tue 10/3

5:50 a.m.-2:19 p.m.

1 stop11h 29m

Seattle/Tacoma Intl

Thu 12/3

3:10 p.m.-1:21 p.m.

1 stop19h 11m

C$ 542

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Sun 22/2

6:10 p.m.-2:19 p.m.

1 stop23h 09m

Seattle/Tacoma Intl

Sun 1/3

3:10 p.m.-5:16 p.m.

1 stop23h 06m

C$ 575

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Mon 23/2

6:10 p.m.-2:19 p.m.

1 stop23h 09m

Seattle/Tacoma Intl

Sun 1/3

5:42 p.m.-5:16 p.m.

2 stops20h 34m

C$ 596

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Tue 24/2

5:50 a.m.-2:19 p.m.

1 stop11h 29m

Seattle/Tacoma Intl

Sun 1/3

3:10 p.m.-5:16 p.m.

1 stop23h 06m

C$ 597

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Mon 9/3

6:10 p.m.-2:19 p.m.

1 stop23h 09m

C$ 223

Flights are sorted by cheapest round-trip flights first.

Deals found on 25/1

Showing 1-10 of 18 results
1
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Best time to book a flight from Hamilton to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Hamilton with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Hamilton to Seattle

What is the cheapest month to book a flight from Hamilton, Ontario to Seattle?

Currently, December is the cheapest month in which you can book a flight from Hamilton, Ontario to Seattle (average of C$ 179). Flying from Hamilton, Ontario to Seattle in August is currently the most expensive (average of C$ 305). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated 27 January 2026.
Read through reviews of airlines operating flights from Hamilton to Seattle, such as WestJet. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
WestJet
7.2
Good
3,251 reviews
Check prices

Food

6.2

Boarding

7.4

Overall

7.2

Comfort

7.0

Crew

7.9

Entertainment

6.1

Reviews

1 / 20
6.0
Good

Deb,Jan 2025

YYZ - YYC

Boarding went smoothly, you didn't accept debit card for food on flight
WestJet
7.2
Good
3,251 reviews
WestJet
7.2
Good
3,251 reviews
Check prices

Food

6.2

Boarding

7.4

Overall

7.2

Comfort

7.0

Crew

7.9

Entertainment

6.1

Reviews

1 / 20
6.0
Good

Deb,Jan 2025

YYZ - YYC

Boarding went smoothly, you didn't accept debit card for food on flight

Related info for your journey

Find useful and relevant information for your journey from Hamilton to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Hamilton, Ontario to Seattle?

    WestJet can get you from Hamilton, Ontario to Seattle in just under 23h 09m. Your travel time can differ by up to . Airlines will cover a distance of 3304 km.

  • What is the cheapest airline to fly from Hamilton, Ontario to Seattle round-trip?

    Cheapflights users have booked flights from Hamilton, Ontario to Seattle round-trip from C$ 213.

  • Can I find deals for flights from Hamilton to Seattle that include hotel bookings?

    Yes. In addition to deals on Hamilton to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Hamilton to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Hamilton to Seattle.

  • Can I find deals for business class flights from Hamilton to Seattle?

    Yes. Cheapflights offers flight deals from Hamilton to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Hamilton, Ontario to Seattle?

    Currently, December is the cheapest month in which you can book a flight from Hamilton, Ontario to Seattle (average of C$ 179). Flying from Hamilton, Ontario to Seattle in August is currently the most expensive (average of C$ 305). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
SeaTac
Mukilteo
Tacoma
Kent
Tukwila
Bothell
Cashmere
Olympia
Renton
Lynnwood
Marysville
Kirkland

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Hamilton to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Hamilton to Seattle

Discover the top airline that operate flights from Hamilton to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 27 January 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 213AverageC$ 389FlexibilityNo cancel feeOn-time60%
Search WestJet flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Hamilton to Seattle?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Hamilton to Seattle. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Hamilton to Seattle?

Cheapflights helps you find that perfect flight to Seattle from Hamilton by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Hamilton to Seattle with no change fees?

Yes! Cheapflights helps users easily find flights from Hamilton to Seattle with no change fees.

Can Cheapflights notify me if prices for flights from Hamilton to Seattle become cheaper?

Yes! Start tracking prices for Hamilton to Seattle flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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