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Cheap flights from Hamilton, ON to Seattle from C$ 300

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 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
YHM — SEA
11 Jul — 18 Jul1
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 11 June 2026.

Thu 9/76:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Thu 16/77:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Deal found 11/6C$ 493
Fri 14/86:15 p.m.
YHM
-
SEA
1 stop18h 25m
WestJet
Tue 25/87:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Deal found 9/6C$ 495
Tue 11/86:10 p.m.
YHM
-
SEA
1 stop27h 35m
WestJet
Sun 16/87:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Deal found 10/6C$ 499
Tue 11/86:10 p.m.
YHM
-
SEA
1 stop29h 50m
WestJet
Fri 21/87:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Deal found 10/6C$ 506
Mon 31/86:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Tue 8/97:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Deal found 9/6C$ 507
Mon 13/76:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Sun 19/77:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Deal found 10/6C$ 510
Thu 23/76:10 p.m.
YHM
-
SEA
1 stop27h 35m
WestJet
Sun 26/77:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Deal found 8/6C$ 517
Wed 24/66:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Sun 28/67:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Deal found 10/6C$ 523
Wed 24/66:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Sat 4/77:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Deal found 10/6C$ 532
Thu 1/106:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Mon 5/107:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Deal found 10/6C$ 535
Sat 29/86:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Mon 7/97:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Deal found 10/6C$ 542
Thu 16/76:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Sun 19/77:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Deal found 9/6C$ 544

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 11 June 2026.

Round-trip from

C$ 493

One-way from

C$ 300

Popular in

June

Cheapest in

February

Average price

C$ 658
WestJet
  • WestJet
  • 22/7-26/7
  • 2 total stops
  • 25h 45m total
  • Hamilton to Seattle
Search Deals
WestJet
  • WestJet
  • 5/7
  • 1 total stop
  • 18h 30m total
  • Hamilton to Seattle
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (C$ 114 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 11 June 2026.
Use the filters below to find and compare flights from Hamilton to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Fri 24/7

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$ 493

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Thu 9/7

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

1 stop18h 30m

Seattle/Tacoma Intl

Thu 16/7

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

1 stop7h 15m

C$ 499

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Sat 8/8

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$ 506

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Fri 4/9

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

1 stop29h 50m

Seattle/Tacoma Intl

Tue 8/9

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

1 stop7h 15m

C$ 577

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Fri 21/8

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

1 stop18h 30m

Seattle/Tacoma Intl

Mon 14/9

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

1 stop18h 40m

C$ 609
Quickest round-trip

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Tue 7/7

7:00 a.m.-6:45 p.m.

3 stops14h 45m

Seattle/Tacoma Intl

Fri 17/7

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

1 stop7h 15m

C$ 675

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 8/7

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

3 stops17h 50m

Seattle/Tacoma Intl

Fri 17/7

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

1 stop27h 45m

C$ 753

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Sun 9/8

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

1 stop18h 30m

Seattle/Tacoma Intl

Tue 18/8

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

1 stop7h 15m

C$ 853

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Sun 1/11

6:10 p.m.-1:20 p.m.

1 stop22h 10m

Seattle/Tacoma Intl

Sat 12/12

3:20 p.m.-4:17 p.m.

1 stop21h 57m

C$ 860

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Thu 25/6

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

1 stop18h 30m

Seattle/Tacoma Intl

Mon 29/6

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

1 stop7h 15m

C$ 878

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/6

Showing 1-10 of 24 resultsSorted by cheapest first
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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.

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 18h 30m. Your travel time can differ by up to . Airlines will cover a distance of 3304 km.

  • 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.

See more FAQs

Travelling to a place near Seattle?

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

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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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