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Cheap flights from Seattle to Hamilton, ON from C$ 254

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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YHM
10 Jul — 17 Jul1
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 10 June 2026.

Sat 25/77:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Tue 28/76:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 9/6C$ 598
Sun 28/67:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Fri 3/76:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 10/6C$ 614
Fri 21/87:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Mon 24/86:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 7/6C$ 619
Sat 25/77:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Sat 1/86:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 10/6C$ 621
Thu 23/77:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Tue 28/76:10 p.m.
YHM
-
SEA
1 stop29h 50m
WestJet
Deal found 7/6C$ 623
Sun 21/67:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Tue 21/76:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 5/6C$ 633
Tue 23/610:30 a.m.
SEA
-
YHM
1 stop27h 45m
WestJet
Sat 27/66:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 9/6C$ 636
Sat 25/77:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Tue 4/86:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 7/6C$ 639
Thu 20/810:30 a.m.
SEA
-
YHM
1 stop27h 45m
WestJet
Mon 24/86:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 9/6C$ 640
Wed 5/87:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Tue 11/86:10 p.m.
YHM
-
SEA
1 stop29h 50m
WestJet
Deal found 10/6C$ 643
Tue 21/77:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Tue 28/76:10 p.m.
YHM
-
SEA
1 stop29h 50m
WestJet
Deal found 9/6C$ 650
Thu 27/87:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Thu 3/96:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 9/6C$ 651

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 10 June 2026.

Round-trip from

C$ 598

One-way from

C$ 254

Popular in

July

Cheapest in

January

Average price

C$ 697
WestJet
  • WestJet
  • 25/7-29/7
  • 2 total stops
  • 25h 45m total
  • Seattle to Hamilton
Search Deals
WestJet
  • WestJet
  • 6/9
  • 1 total stop
  • 7h 15m total
  • Seattle to Hamilton
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (C$ 215 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 22 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 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 10 June 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

Fri 28/8

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

1 stop7h 15m

Hamilton

Tue 1/9

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

1 stop18h 30m

C$ 619

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 23/7

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

1 stop7h 15m

Hamilton

Tue 28/7

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

1 stop29h 50m

C$ 623

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 9/7

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

1 stop18h 40m

Hamilton

Tue 14/7

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

1 stop18h 30m

C$ 661

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Wed 1/7

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

1 stop7h 15m

Hamilton

Thu 9/7

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

3 stops17h 50m

C$ 724

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 15/8

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

1 stop7h 15m

Hamilton

Thu 20/8

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

1 stop18h 30m

C$ 724

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 23/7

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

1 stop18h 40m

Hamilton

Tue 28/7

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

2 stops15h 35m

C$ 731

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 3/10

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

1 stop18h 40m

Hamilton

Mon 12/10

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

1 stop27h 35m

C$ 733

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Mon 20/7

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

1 stop7h 15m

Hamilton

Mon 27/7

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

1 stop18h 30m

C$ 771

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Mon 13/7

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

1 stop27h 45m

Hamilton

Tue 21/7

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

1 stop18h 30m

C$ 771
Quickest round-trip

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Wed 1/7

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

1 stop7h 15m

Hamilton

Tue 7/7

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

3 stops15h 35m

C$ 788

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/6

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.

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

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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!

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