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$86+ Cheap flights from Seattle (SEA) to Hamilton, ON (YHM)

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 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YHM
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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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 September 11, 2025.

Round-trip from

$223
(oojo)

One-way from

$86
(oojo)

Popular in

June

Cheapest in

January

Average price

$408
From Seattle/Tacoma Intl to Hamilton
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One-way flight from Seattle/Tacoma Intl to Hamilton
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Highest demand for flights based on searches. 14% potential increase in price ($65 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 11, 2025.

This oojo deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/11:50 pmSEA - YHM
1 stop7h 50mWestJet
Mon 10/66:00 amYHM - SEA
1 stop17h 29mWestJet
Deal found 9/9$223
This Trip.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/181:50 pmSEA - YHM
1 stop7h 50mWestJet
Sat 10/256:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/10$242
This oojo deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/241:50 pmSEA - YHM
1 stop7h 50mWestJet
Sun 10/266:10 pmYHM - SEA
1 stop23h 10mWestJet
Deal found 9/9$245
This Trip.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/202:05 pmSEA - YHM
1 stop7h 35mWestJet
Thu 10/236:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/10$251
This Trip.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/161:50 pmSEA - YHM
1 stop7h 50mWestJet
Tue 10/216:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/11$256
This oojo deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/43:10 pmSEA - YHM
1 stop23h 07mWestJet
Sun 11/166:10 pmYHM - SEA
1 stop23h 10mWestJet
Deal found 9/9$272
This Trip.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/198:40 amSEA - YHM
1 stop13h 00mWestJet
Wed 10/226:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/11$284
This oojo deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/217:05 amSEA - YHM
1 stop14h 35mWestJet
Sat 10/256:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/10$287
This oojo deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/263:10 pmSEA - YHM
1 stop23h 07mWestJet
Sun 11/306:10 pmYHM - SEA
1 stop23h 10mWestJet
Deal found 9/11$308
This oojo deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/93:10 pmSEA - YHM
1 stop23h 07mWestJet
Thu 11/136:10 pmYHM - SEA
1 stop23h 10mWestJet
Deal found 9/10$328
This Trip.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/111:50 pmSEA - YHM
1 stop7h 50mWestJet
Sat 10/186:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/11$332

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 2,558,603 searches. Data last updated September 11, 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 10/1

1:50 pm-12:40 am

1 stop7h 50m

Hamilton

Mon 10/6

6:00 am-8:29 pm

1 stop17h 29m

$223

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 10/18

1:50 pm-12:40 am

1 stop7h 50m

Hamilton

Sat 10/25

6:00 am-12:59 pm

1 stop9h 59m

$242

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 10/24

1:50 pm-12:40 am

1 stop7h 50m

Hamilton

Sun 10/26

6:10 pm-2:20 pm

1 stop23h 10m

$245

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Mon 10/20

2:05 pm-12:40 am

1 stop7h 35m

Hamilton

Thu 10/23

6:00 am-12:59 pm

1 stop9h 59m

$256

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 10/16

1:50 pm-12:40 am

1 stop7h 50m

Hamilton

Tue 10/21

6:00 am-12:59 pm

1 stop9h 59m

$256

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 11/11

3:10 pm-5:17 pm

1 stop23h 07m

Hamilton

Sun 11/16

6:10 pm-2:20 pm

1 stop23h 10m

$272

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 11/4

3:10 pm-5:17 pm

1 stop23h 07m

Hamilton

Sun 11/16

6:10 pm-2:20 pm

1 stop23h 10m

$272

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Wed 11/26

3:10 pm-5:17 pm

1 stop23h 07m

Hamilton

Sun 11/30

6:10 pm-2:20 pm

1 stop23h 10m

$308

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 10/11

1:50 pm-12:40 am

1 stop7h 50m

Hamilton

Sat 10/18

6:00 am-12:59 pm

1 stop9h 59m

$332

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 11/9

3:10 pm-5:17 pm

1 stop23h 07m

Hamilton

Thu 11/13

6:10 pm-2:20 pm

1 stop23h 10m

$335

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 24 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.

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?

    Airlines like WestJet fly from Seattle to Hamilton, Ontario in about 7h 50m. The time it takes to get you to your destination can typically vary by up to . Seattle and Hamilton, Ontario are separated by a distance of 2053 mi.

  • 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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