Find flights
When to book
FAQs

Cheap flights from Seattle to Hamilton, ON from C$ 118

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 17/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YHM
11 Oct — 18 Oct1
1 adult
1 adult, Economy

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 11 September 2025.

Round-trip from

C$ 287

One-way from

C$ 118

Popular in

June

Cheapest in

January

Average price

C$ 565
WestJet
  • WestJet
  • 16/10-21/10
  • 2 total stops
  • 17h 49m total
  • Seattle to Hamilton
Search Deals
WestJet
  • WestJet
  • 17/10
  • 1 total stop
  • 7h 50m total
  • Seattle to Hamilton
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (C$ 124 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Seattle to Hamilton

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 September 2025.

Thu 16/101:50 p.m.SEA - YHM
1 stop7h 50mWestJet
Tue 21/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Deal found 9/9C$ 287
Sat 18/101:50 p.m.SEA - YHM
1 stop7h 50mWestJet
Sat 25/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Deal found 9/9C$ 290
Wed 1/101:50 p.m.SEA - YHM
1 stop7h 50mWestJet
Mon 6/106:00 a.m.YHM - SEA
1 stop17h 29mWestJet
Deal found 9/9C$ 309
Tue 21/107:05 a.m.SEA - YHM
1 stop14h 35mWestJet
Sat 25/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Deal found 9/9C$ 340
Mon 20/102:05 p.m.SEA - YHM
1 stop7h 35mWestJet
Thu 23/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Deal found 10/9C$ 348
Tue 4/113:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Sun 16/116:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Deal found 9/9C$ 377
Sun 19/108:40 a.m.SEA - YHM
1 stop13h 00mWestJet
Wed 22/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Deal found 11/9C$ 394

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 September 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

Sat 18/10

1:50 p.m.-12:40 a.m.

1 stop7h 50m

Hamilton

Sat 25/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

C$ 290

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Wed 1/10

1:50 p.m.-12:40 a.m.

1 stop7h 50m

Hamilton

Mon 6/10

6:00 a.m.-8:29 p.m.

1 stop17h 29m

C$ 309

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Mon 20/10

2:05 p.m.-12:40 a.m.

1 stop7h 35m

Hamilton

Thu 23/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

C$ 348

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 16/10

1:50 p.m.-12:40 a.m.

1 stop7h 50m

Hamilton

Tue 21/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

C$ 355

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 11/11

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

1 stop23h 07m

Hamilton

Sun 16/11

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

1 stop23h 10m

C$ 377

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 9/11

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

1 stop23h 07m

Hamilton

Thu 13/11

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

1 stop23h 10m

C$ 377

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 4/11

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

1 stop23h 07m

Hamilton

Sun 16/11

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

1 stop23h 10m

C$ 377

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 8/11

3:20 p.m.-5:17 p.m.

1 stop22h 57m

Hamilton

Sun 22/2

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

1 stop23h 09m

C$ 407

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Wed 1/10

8:40 a.m.-9:19 p.m.

1 stop9h 39m

Hamilton

Mon 13/10

12:10 p.m.-8:29 p.m.

1 stop11h 19m

C$ 417

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 17/10

1:50 p.m.-12:40 a.m.

1 stop7h 50m

C$ 118

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 19 results
1
2

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$ 186). Flying from Seattle to Hamilton, Ontario in December is currently the most expensive (average of C$ 271). 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 50m. 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$ 186). Flying from Seattle to Hamilton, Ontario in December is currently the most expensive (average of C$ 271). 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

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.