Find flights
When to book
FAQs

Cheap flights from Seattle to Hamilton, ON from C$ 156

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 23/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YHM
24 May — 31 May1
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 24 April 2026.

Tue 23/67:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Wed 24/66:10 p.m.
YHM
-
SEA
1 stop27h 35m
WestJet
Deal found 21/4C$ 387
Wed 17/67:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Tue 23/66:10 p.m.
YHM
-
SEA
1 stop27h 35m
WestJet
Deal found 22/4C$ 394
Wed 17/67:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Sat 20/66:10 p.m.
YHM
-
SEA
1 stop29h 50m
WestJet
Deal found 21/4C$ 428
Thu 18/67:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Mon 22/66:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 21/4C$ 434
Thu 18/67:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Tue 23/66:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 20/4C$ 450
Sat 9/57:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Sat 16/56:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 20/4C$ 458
Thu 7/57:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Sun 10/56:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 23/4C$ 462
Tue 5/57:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Fri 8/56:10 p.m.
YHM
-
SEA
1 stop27h 35m
WestJet
Deal found 21/4C$ 466
Fri 8/57:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Sun 10/56:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 19/4C$ 469
Wed 6/57:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Sat 9/56:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 22/4C$ 471
Sat 30/57:35 p.m.
SEA
-
YHM
1 stop18h 40m
WestJet
Fri 5/66:10 p.m.
YHM
-
SEA
1 stop27h 35m
WestJet
Deal found 20/4C$ 472

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 24 April 2026.

Round-trip from

C$ 387

One-way from

C$ 156

Popular in

June

Cheapest in

January

Average price

C$ 506
WestJet
  • WestJet
  • 23/6-24/6
  • 2 total stops
  • 34h 50m total
  • Seattle to Hamilton
Search Deals
WestJet
  • WestJet
  • 23/6
  • 1 total stop
  • 7h 15m total
  • Seattle to Hamilton
Search Deals
Highest demand for flights based on searches. 17% potential increase in price (C$ 152 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 24 April 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

Tue 23/6

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

1 stop7h 15m

Hamilton

Wed 24/6

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

1 stop27h 35m

C$ 387

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 9/5

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

1 stop18h 40m

Hamilton

Sat 16/5

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

1 stop18h 30m

C$ 460

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 8/5

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

1 stop18h 40m

Hamilton

Sun 10/5

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

1 stop18h 30m

C$ 469

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 18/6

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$ 472

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 8/5

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

1 stop18h 40m

Hamilton

Mon 11/5

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

1 stop18h 30m

C$ 473

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 6/6

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

1 stop18h 40m

Hamilton

Tue 9/6

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

1 stop18h 30m

C$ 512
Quickest round-trip

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 20/8

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

1 stop7h 15m

Hamilton

Mon 24/8

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

1 stop18h 30m

C$ 524

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 19/6

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

1 stop18h 40m

Hamilton

Sun 28/6

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

1 stop27h 35m

C$ 547

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 8/5

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

1 stop18h 40m

Hamilton

Tue 12/5

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

1 stop18h 30m

C$ 590

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 21/8

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

1 stop18h 40m

Hamilton

Mon 24/8

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

1 stop27h 35m

C$ 592

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/4

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

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.

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 15m. 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 Seattle to Hamilton?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Seattle to Hamilton. 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 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.

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

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!

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.