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Cheap flights from Seattle to Hamilton, ON from C$ 197

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 10/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YHM
26 Feb — 5 Mar1
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 27 January 2026.

Sat 2/57:05 a.m.
SEA
-
YHM
1 stop7h 10m
WestJet
Sat 9/56:10 p.m.
YHM
-
SEA
1 stop21h 58m
WestJet
Deal found 24/1C$ 378
Thu 14/57:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Mon 18/56:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 26/1C$ 431
Fri 1/510:30 a.m.
SEA
-
YHM
1 stop27h 45m
WestJet
Mon 11/56:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 25/1C$ 437
Wed 29/47:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Sun 3/56:10 p.m.
YHM
-
SEA
1 stop27h 35m
WestJet
Deal found 26/1C$ 455
Tue 7/43:10 p.m.
SEA
-
YHM
1 stop23h 06m
WestJet
Mon 13/46:10 p.m.
YHM
-
SEA
1 stop23h 09m
WestJet
Deal found 27/1C$ 456
Wed 11/33:10 p.m.
SEA
-
YHM
1 stop23h 06m
WestJet
Tue 24/35:50 a.m.
YHM
-
SEA
1 stop11h 29m
WestJet
Deal found 24/1C$ 457
Fri 1/511:12 p.m.
SEA
-
YHM
2 stops14h 58m
Multiple Airlines
Mon 11/56:10 p.m.
YHM
-
SEA
1 stop28h 42m
Multiple Airlines
Deal found 25/1C$ 481
Wed 11/311:08 p.m.
SEA
-
YHM
1 stop21h 27m
Multiple Airlines
Wed 18/36:10 p.m.
YHM
-
SEA
2 stops15h 52m
Multiple Airlines
Deal found 25/1C$ 519
Sat 28/210:05 a.m.
SEA
-
YHM
1 stop10h 30m
Multiple Airlines
Sat 7/38:15 a.m.
YHM
-
SEA
1 stop14h 01m
Multiple Airlines
Deal found 27/1C$ 564
Wed 11/311:08 p.m.
SEA
-
YHM
1 stop21h 27m
Multiple Airlines
Wed 13/57:25 a.m.
YHM
-
SEA
1 stop26h 44m
Multiple Airlines
Deal found 25/1C$ 597
Tue 2/610:30 a.m.
SEA
-
YHM
1 stop9h 43m
Multiple Airlines
Mon 8/66:10 p.m.
YHM
-
SEA
1 stop27h 35m
Multiple Airlines
Deal found 26/1C$ 600

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 27 January 2026.

Round-trip from

C$ 378

One-way from

C$ 197

Popular in

June

Cheapest in

January

Average price

C$ 368
WestJet
  • WestJet
  • 2/5-9/5
  • 2 total stops
  • 29h 08m total
  • Seattle to Hamilton
Search Deals
WestJet
  • WestJet
  • 10/2
  • 1 total stop
  • 23h 06m total
  • Seattle to Hamilton
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (C$ 134 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 January 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 27 January 2026.
Use the filters below to find and compare flights from Seattle to Hamilton that are best for you.

Fly from

Seattle

Fly to

Hamilton

Route

Depart

Return

Price

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 2/5

7:05 a.m.-5:15 p.m.

1 stop7h 10m

Hamilton

Sat 9/5

6:10 p.m.-1:08 p.m.

1 stop21h 58m

C$ 378

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 14/5

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

1 stop18h 40m

Hamilton

Mon 18/5

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

1 stop18h 30m

C$ 431

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 2/5

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

1 stop18h 40m

Hamilton

Sun 10/5

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

1 stop27h 35m

C$ 455

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 7/4

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

1 stop23h 06m

Hamilton

Mon 13/4

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

1 stop23h 09m

C$ 456

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 12/5

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

1 stop18h 40m

Hamilton

Sun 17/5

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

1 stop18h 30m

C$ 456

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 4/6

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

1 stop18h 35m

Hamilton

Mon 8/6

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

1 stop27h 35m

C$ 457

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Wed 11/3

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

1 stop23h 06m

Hamilton

Tue 24/3

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

1 stop11h 29m

C$ 457

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 28/2

10:05 a.m.-11:35 p.m.

1 stop10h 30m

Hamilton

Sat 7/3

8:15 a.m.-7:16 p.m.

1 stop14h 01m

C$ 564

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Wed 11/3

11:08 p.m.-11:35 p.m.

1 stop21h 27m

Hamilton

Wed 13/5

7:25 a.m.-7:09 a.m.

1 stop26h 44m

C$ 597

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 2/6

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

1 stop9h 43m

Hamilton

Mon 8/6

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

1 stop27h 35m

C$ 600

Flights are sorted by cheapest round-trip flights first.

Deals found on 25/1

Showing 1-10 of 22 results
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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, April is the cheapest month in which you can book a flight from Seattle to Hamilton, Ontario (average of C$ 171). Flying from Seattle to Hamilton, Ontario in December is currently the most expensive (average of C$ 385). 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 7h 10m. 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, April is the cheapest month in which you can book a flight from Seattle to Hamilton, Ontario (average of C$ 171). Flying from Seattle to Hamilton, Ontario in December is currently the most expensive (average of C$ 385). 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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