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$123+ 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 2/26. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YHM
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Cheap 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 December 12, 2025.

This Expedia deal was found by Cheapflights users on 12/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/268:05 amSEA - YHM
1 stop12h 42mMultiple Airlines
Wed 12/318:15 amYHM - SEA
1 stop13h 35mMultiple Airlines
Deal found 12/10$1,040
This Orbitz deal was found by Cheapflights users on 12/11. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/308:05 amSEA - YHM
1 stop12h 42mMultiple Airlines
Mon 1/58:15 amYHM - SEA
1 stop9h 12mMultiple Airlines
Deal found 12/11$1,045
This Trip.com deal was found by Cheapflights users on 12/10. 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.
Thu 12/253:10 pmSEA - YHM
1 stop19h 12mWestJet
Tue 12/305:45 amYHM - SEA
1 stop11h 35mWestJet
Deal found 12/10$1,079
This Expedia deal was found by Cheapflights users on 12/9. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/308:05 amSEA - YHM
1 stop12h 42mMultiple Airlines
Sun 1/48:15 amYHM - SEA
1 stop13h 35mMultiple Airlines
Deal found 12/9$1,093
This WestJet deal was found by Cheapflights users on 12/10. 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 WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/253:10 pmSEA - YHM
1 stop19h 12mWestJet
Sun 12/286:10 pmYHM - SEA
2 stops16h 10mWestJet
Deal found 12/10$1,096
This WestJet deal was found by Cheapflights users on 12/10. 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 WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/233:10 pmSEA - YHM
1 stop23h 07mWestJet
Sun 12/286:10 pmYHM - SEA
2 stops16h 10mWestJet
Deal found 12/10$1,153
This Expedia deal was found by Cheapflights users on 12/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/268:05 amSEA - YHM
1 stop12h 42mMultiple Airlines
Sun 12/288:15 amYHM - SEA
1 stop9h 12mMultiple Airlines
Deal found 12/10$1,223
This WestJet deal was found by Cheapflights users on 12/10. 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 WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/201:30 pmSEA - YHM
2 stops24h 47mWestJet
Thu 12/256:10 pmYHM - SEA
2 stops16h 10mWestJet
Deal found 12/10$1,367
This oojo deal was found by Cheapflights users on 12/11. 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 12/173:10 pmSEA - YHM
1 stop23h 07mWestJet
Mon 12/296:10 pmYHM - SEA
1 stop23h 10mWestJet
Deal found 12/11$1,375
This oojo deal was found by Cheapflights users on 12/11. 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 12/243:10 pmSEA - YHM
1 stop23h 07mWestJet
Wed 12/316:10 pmYHM - SEA
1 stop23h 10mWestJet
Deal found 12/11$1,419
This oojo deal was found by Cheapflights users on 12/10. 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.
Sat 12/273:20 pmSEA - YHM
1 stop22h 57mWestJet
Tue 1/65:45 amYHM - SEA
1 stop11h 35mWestJet
Deal found 12/10$1,474

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 December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$286
(Flightnetwork)

One-way from

$123
(Flightnetwork)

Popular in

December

Cheapest in

November

Average price

$553
Provider with most accurate pricing for Seattle/Tacoma Intl-Hamilton flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Hamilton flights.
Search Deals
From Seattle/Tacoma Intl to Hamilton
Search Deals
One-way flight from Seattle/Tacoma Intl to Hamilton
Search Deals
High demand for flights, 7% potential price rise
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 2,558,603 searches. Data last updated December 12, 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

Sun 1/25

3:10 pm-5:17 pm

1 stop23h 07m

Hamilton

Sun 2/1

6:10 pm-2:19 pm

1 stop23h 09m

$286

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 1/8

3:10 pm-1:22 pm

1 stop19h 12m

Hamilton

Sun 1/11

6:10 pm-2:20 pm

1 stop23h 10m

$294

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 1/8

3:10 pm-1:22 pm

1 stop19h 12m

Hamilton

Thu 1/15

8:15 am-10:22 am

2 stops29h 07m

$351

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Wed 1/21

3:10 pm-5:17 pm

1 stop23h 07m

Hamilton

Sat 1/24

8:15 am-10:22 am

2 stops29h 07m

$354

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 1/25

5:50 am-7:00 pm

1 stop10h 10m

Hamilton

Sun 2/1

8:15 am-10:25 am

2 stops29h 10m

$401

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 1/8

3:10 pm-7:00 pm

3 stops24h 50m

Hamilton

Sun 1/11

8:15 am-10:22 am

2 stops29h 07m

$432

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 1/25

3:10 pm-5:17 pm

1 stop23h 07m

Hamilton

Tue 1/27

5:45 am-2:20 pm

1 stop11h 35m

$451

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 2/12

3:10 pm-1:21 pm

1 stop19h 11m

Hamilton

Mon 2/16

6:10 pm-2:19 pm

1 stop23h 09m

$485

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 1/8

3:10 pm-1:22 pm

1 stop19h 12m

Hamilton

Mon 1/12

6:10 pm-2:20 pm

1 stop23h 10m

$493

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 2/26

3:10 pm-1:21 pm

1 stop19h 11m

$123

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 19 results
1
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Compare providers for flights from Seattle to Hamilton

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Hamilton in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Hamilton, Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Seattle-Hamilton, Ontario flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Seattle-Hamilton, Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Hamilton, Ontario flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Hamilton, Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 $121). Flying from Seattle to Hamilton, Ontario in May is currently the most expensive (average of $272). 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?

    Airlines like WestJet fly from Seattle to Hamilton, Ontario in about 23h 07m. 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.

  • 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 $121). Flying from Seattle to Hamilton, Ontario in May is currently the most expensive (average of $272). 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

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