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Cheap flights from Seattle to Hamilton, ON from C$ 186

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 21/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YHM
10 Apr — 17 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Hamilton

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Hamilton
Explore the most affordable flight options available from Seattle to Hamilton. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 March 2026.

Wed 29/47:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Tue 12/56:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 5/3C$ 417
Sat 2/57:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Tue 5/56:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 5/3C$ 459
Thu 9/43:10 p.m.
SEA
-
YHM
1 stop19h 11m
WestJet
Mon 13/46:10 p.m.
YHM
-
SEA
1 stop23h 09m
WestJet
Deal found 10/3C$ 463
Fri 8/57:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Tue 19/56:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 7/3C$ 467
Wed 17/67:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Sun 21/66:10 p.m.
YHM
-
SEA
1 stop27h 35m
WestJet
Deal found 8/3C$ 481
Fri 12/67:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Sun 14/66:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 9/3C$ 486
Fri 1/57:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Sun 3/56:10 p.m.
YHM
-
SEA
1 stop27h 35m
WestJet
Deal found 9/3C$ 487
Thu 21/510:30 a.m.
SEA
-
YHM
1 stop27h 45m
WestJet
Sun 24/56:10 p.m.
YHM
-
SEA
1 stop27h 35m
WestJet
Deal found 6/3C$ 493
Sat 25/43:20 p.m.
SEA
-
YHM
1 stop22h 55m
WestJet
Sat 2/56:10 p.m.
YHM
-
SEA
1 stop27h 35m
WestJet
Deal found 6/3C$ 494
Thu 11/67:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Wed 17/66:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 6/3C$ 502
Fri 12/610:30 a.m.
SEA
-
YHM
1 stop27h 45m
WestJet
Wed 17/66:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 10/3C$ 504

Find flight deals from Seattle to Hamilton

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Hamilton (YHM). 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 March 2026.

Round-trip from

C$ 463

One-way from

C$ 186

Popular in

June

Cheapest in

January

Average price

C$ 543
WestJet
  • WestJet
  • 9/4-13/4
  • 2 total stops
  • 42h 20m total
  • Seattle to Hamilton
Search Deals
WestJet
  • WestJet
  • 21/6
  • 1 total stop
  • 7h 15m total
  • Seattle to Hamilton
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. 2% potential price decrease (C$ 18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Hamilton 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 March 2026.
Use the filters below to find and compare flights from Seattle to Hamilton that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 10/5

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

1 stop18h 40m

Hamilton

Wed 13/5

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

1 stop18h 30m

C$ 467

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 11/6

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

1 stop18h 40m

Hamilton

Wed 17/6

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

1 stop18h 30m

C$ 502

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 12/6

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

1 stop27h 45m

Hamilton

Fri 19/6

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

1 stop29h 50m

C$ 523

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 2/5

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

1 stop18h 40m

Hamilton

Tue 5/5

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

1 stop18h 30m

C$ 538

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 21/5

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

1 stop27h 45m

Hamilton

Mon 25/5

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

1 stop27h 35m

C$ 544

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 7/5

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

1 stop18h 40m

Hamilton

Sun 10/5

5:45 p.m.-9:40 a.m.

2 stops18h 55m

C$ 584

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Wed 27/5

10:30 a.m.-11:13 p.m.

1 stop9h 43m

Hamilton

Mon 1/6

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

2 stops14h 45m

C$ 660

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 18/8

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

1 stop7h 15m

Hamilton

Sun 23/8

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

1 stop29h 50m

C$ 732

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 23/5

10:30 a.m.-11:13 p.m.

1 stop9h 43m

Hamilton

Tue 26/5

7:55 p.m.-9:40 a.m.

1 stop16h 45m

C$ 786
Quickest round-trip

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 24/4

8:41 a.m.-7:00 p.m.

1 stop7h 19m

Hamilton

Mon 27/4

8:15 a.m.-2:47 p.m.

1 stop9h 32m

C$ 792

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

Showing 1-10 of 21 resultsSorted by cheapest first
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Best time to book a flight from Seattle to Hamilton

Have a flexible travel schedule? Discover the best time to fly to Hamilton from Seattle 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 Seattle to Hamilton

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

Currently, January is the cheapest month in which you can book a flight from Seattle to Hamilton, Ontario (average of C$ 179). Flying from Seattle to Hamilton, Ontario in May is currently the most expensive (average of C$ 382). 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.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Hamilton. 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 Seattle to Hamilton, Ontario?

    WestJet can get you from Seattle to Hamilton, Ontario in just under 18h 40m. Your travel time can differ by up to . Airlines will cover a distance of 3304 km.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Seattle to Hamilton 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 Seattle to Hamilton, Ontario?

    Currently, January is the cheapest month in which you can book a flight from Seattle to Hamilton, Ontario (average of C$ 179). Flying from Seattle to Hamilton, Ontario in May is currently the most expensive (average of C$ 382). 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

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

Cheapflights helps you find that perfect flight to Hamilton from Seattle 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 Seattle to Hamilton with no change fees?

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

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Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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