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Cheap flights from Seattle to Hamilton, ON from C$ 185

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 11/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YHM
27 Nov — 4 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap 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 28 October 2025.

Round-trip from

C$ 383

One-way from

C$ 217

Popular in

June

Cheapest in

January

Average price

C$ 618
WestJet
  • WestJet
  • 18/2-22/2
  • 2 total stops
  • 46h 15m total
  • Seattle to Hamilton
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WestJet
  • WestJet
  • 18/11
  • 1 total stop
  • 23h 07m total
  • Seattle to Hamilton
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Highest demand for flights based on searches. 14% potential increase in price (C$ 130 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 19 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find 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 28 October 2025.

Mon 24/113:10 p.m.SEA - YHM
1 stop29h 37mMultiple Airlines
Mon 1/128:15 a.m.YHM - SEA
1 stop27h 48mMultiple Airlines
Deal found 26/10C$ 529
Tue 18/113:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Thu 20/116:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Deal found 27/10C$ 537
Sat 29/115:50 a.m.SEA - YHM
1 stop10h 10mMultiple Airlines
Sat 6/128:15 a.m.YHM - SEA
1 stop9h 16mMultiple Airlines
Deal found 26/10C$ 559
Sun 23/113:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Sun 30/116:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Deal found 26/10C$ 569
Thu 11/123:10 p.m.SEA - YHM
1 stop29h 37mMultiple Airlines
Thu 18/126:10 p.m.YHM - SEA
1 stop23h 10mMultiple Airlines
Deal found 26/10C$ 636
Wed 10/123:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Wed 17/126:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Deal found 26/10C$ 669
Fri 21/115:50 a.m.SEA - YHM
1 stop10h 10mMultiple Airlines
Sun 30/118:15 a.m.YHM - SEA
1 stop11h 31mMultiple Airlines
Deal found 27/10C$ 695
Sun 23/1111:10 p.m.SEA - YHM
2 stops15h 07mMultiple Airlines
Thu 27/116:10 p.m.YHM - SEA
2 stops17h 49mMultiple Airlines
Deal found 27/10C$ 708

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 28 October 2025.
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

Wed 18/2

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

1 stop23h 06m

Hamilton

Sun 22/2

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

1 stop23h 09m

C$ 383

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 15/1

3:10 p.m.-1:22 p.m.

1 stop19h 12m

Hamilton

Sun 18/1

6:10 p.m.-2:20 p.m.

1 stop23h 10m

C$ 413

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 15/1

3:10 p.m.-1:22 p.m.

1 stop19h 12m

Hamilton

Mon 19/1

6:10 p.m.-2:20 p.m.

1 stop23h 10m

C$ 439

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 26/2

3:10 p.m.-1:21 p.m.

1 stop19h 11m

Hamilton

Sun 1/3

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

1 stop23h 09m

C$ 439

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 19/2

3:10 p.m.-1:21 p.m.

1 stop19h 11m

Hamilton

Mon 23/2

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

1 stop23h 09m

C$ 449

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 19/2

3:10 p.m.-1:21 p.m.

1 stop19h 11m

Hamilton

Sun 22/2

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

1 stop23h 09m

C$ 449

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Wed 18/2

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

1 stop23h 06m

Hamilton

Mon 23/2

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

1 stop23h 09m

C$ 449

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Mon 24/11

3:10 p.m.-11:47 p.m.

1 stop29h 37m

Hamilton

Mon 1/12

6:10 p.m.-9:03 a.m.

2 stops17h 53m

C$ 530

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 18/11

3:10 p.m.-5:17 p.m.

1 stop23h 07m

Hamilton

Thu 20/11

6:10 p.m.-2:20 p.m.

1 stop23h 10m

C$ 537

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 29/11

5:50 a.m.-7:00 p.m.

1 stop10h 10m

Hamilton

Sat 6/12

8:15 a.m.-2:31 p.m.

1 stop9h 16m

C$ 559

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/10

Showing 1-10 of 18 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, March is the cheapest month in which you can book a flight from Seattle to Hamilton, Ontario (average of C$ 169). Flying from Seattle to Hamilton, Ontario in May is currently the most expensive (average of C$ 379). 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 23h 06m. 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, March is the cheapest month in which you can book a flight from Seattle to Hamilton, Ontario (average of C$ 169). Flying from Seattle to Hamilton, Ontario in May is currently the most expensive (average of C$ 379). 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.

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

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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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