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$137+ 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 6/21. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YHM
Apr 10 — Apr 171
Fri 4/10
Fri 4/17
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 March 11, 2026.

This Trip.com deal was found by Cheapflights users on 3/10. 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 4/93:10 pm
SEA
-
YHM
1 stop19h 11m
WestJet
Mon 4/136:10 pm
YHM
-
SEA
1 stop23h 09m
WestJet
Deal found 3/10$341
This FlightHub deal was found by Cheapflights users on 3/7. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/87:35 pm
SEA
-
YHM
1 stop18h 40m
WestJet
Tue 5/196:10 pm
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 3/7$344
This oojo deal was found by Cheapflights users on 3/8. 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 6/177:00 am
SEA
-
YHM
1 stop7h 15m
WestJet
Sun 6/216:10 pm
YHM
-
SEA
1 stop27h 35m
WestJet
Deal found 3/8$354
This Trip.com deal was found by Cheapflights users on 3/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/127:35 pm
SEA
-
YHM
1 stop18h 40m
WestJet
Sun 6/146:10 pm
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 3/9$358
This Gotogate deal was found by Cheapflights users on 3/9. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/17:35 pm
SEA
-
YHM
1 stop18h 40m
WestJet
Sun 5/36:10 pm
YHM
-
SEA
1 stop27h 35m
WestJet
Deal found 3/9$359
This oojo deal was found by Cheapflights users on 3/6. 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.
Thu 5/2110:30 am
SEA
-
YHM
1 stop27h 45m
WestJet
Sun 5/246:10 pm
YHM
-
SEA
1 stop27h 35m
WestJet
Deal found 3/6$363
This Gotogate deal was found by Cheapflights users on 3/6. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/253:20 pm
SEA
-
YHM
1 stop22h 55m
WestJet
Sat 5/26:10 pm
YHM
-
SEA
1 stop27h 35m
WestJet
Deal found 3/6$364
This FlightHub deal was found by Cheapflights users on 3/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/297:35 pm
SEA
-
YHM
1 stop18h 40m
WestJet
Tue 5/126:10 pm
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 3/10$368
This FlightHub deal was found by Cheapflights users on 3/6. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/117:35 pm
SEA
-
YHM
1 stop18h 40m
WestJet
Wed 6/176:10 pm
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 3/6$370
This FlightHub deal was found by Cheapflights users on 3/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/1210:30 am
SEA
-
YHM
1 stop27h 45m
WestJet
Wed 6/176:10 pm
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 3/10$371
This Booking.com deal was found by Cheapflights users on 3/9. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/810:30 am
SEA
-
YHM
1 stop27h 45m
WestJet
Fri 6/126:10 pm
YHM
-
SEA
1 stop27h 35m
WestJet
Deal found 3/9$372
This oojo deal was found by Cheapflights users on 3/7. 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 5/97:35 pm
SEA
-
YHM
1 stop18h 40m
WestJet
Sat 6/206:10 pm
YHM
-
SEA
1 stop18h 30m
WestJet
Deal found 3/7$374

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 March 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$307
(oojo)

One-way from

$137
(Trip.com)

Popular in

June

Cheapest in

January

Average price

$400
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
Highest demand for flights based on searches. 13% potential increase in price ($62 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 2,558,603 searches. Data last updated March 11, 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

Sun 5/10

7:35 pm-5:15 pm

1 stop18h 40m

Hamilton

Wed 5/13

6:10 pm-9:40 am

1 stop18h 30m

$344

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 5/9

7:35 pm-5:15 pm

1 stop18h 40m

Hamilton

Tue 5/12

6:10 pm-9:40 am

1 stop18h 30m

$363

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 6/12

10:30 am-5:15 pm

1 stop27h 45m

Hamilton

Fri 6/19

6:10 pm-9:00 pm

1 stop29h 50m

$385

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 4/25

3:20 pm-5:15 pm

1 stop22h 55m

Hamilton

Sat 5/2

6:10 pm-9:40 am

1 stop18h 30m

$388

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 6/11

7:35 pm-5:15 pm

1 stop18h 40m

Hamilton

Tue 6/16

6:10 pm-9:40 am

1 stop18h 30m

$388

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 5/2

7:35 pm-5:15 pm

1 stop18h 40m

Hamilton

Tue 5/5

6:10 pm-9:40 am

1 stop18h 30m

$396

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 8/6

7:00 am-5:15 pm

1 stop7h 15m

Hamilton

Mon 8/17

6:10 pm-9:00 pm

1 stop29h 50m

$405

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 8/18

7:00 am-5:15 pm

1 stop7h 15m

Hamilton

Sun 8/23

6:10 pm-9:00 pm

1 stop29h 50m

$539

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 4/7

8:41 am-7:00 pm

1 stop7h 19m

Hamilton

Tue 4/14

5:50 am-2:19 pm

1 stop11h 29m

$550

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 5/23

7:35 pm-10:09 pm

2 stops23h 34m

Hamilton

Tue 5/26

8:50 am-9:40 am

2 stops27h 50m

$570

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/7

Showing 1-10 of 23 resultsSorted by cheapest first
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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 March.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Hamilton, Ontario flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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, January is the cheapest month in which you can book a flight from Seattle to Hamilton, Ontario (average of $132). Flying from Seattle to Hamilton, Ontario in May is currently the most expensive (average of $281). 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 18h 40m. 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, January is the cheapest month in which you can book a flight from Seattle to Hamilton, Ontario (average of $132). Flying from Seattle to Hamilton, Ontario in May is currently the most expensive (average of $281). 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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