HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Hamilton

$155+ 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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YHM
nov. 27 — dic. 41
jue. 11/27
jue. 12/4
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Hamilton with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 octubre 28, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$274
(Trip.com)

One-way from

$155
(Trip.com)

Popular in

June

Cheapest in

January

Average price

$442
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. 14% potential increase in price ($66 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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 octubre 28, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/243:10 pmSEA - YHM
1 stop29h 37mMultiple Airlines
lun. 12/18:15 amYHM - SEA
1 stop27h 48mMultiple Airlines
Deal found 10/26$378
This oojo deal was found by Cheapflights users on 10/27. 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.
mar. 11/183:10 pmSEA - YHM
1 stop23h 07mWestJet
jue. 11/206:10 pmYHM - SEA
1 stop23h 10mWestJet
Deal found 10/27$384
This Mytrip deal was found by Cheapflights users on 10/26. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/295:50 amSEA - YHM
1 stop10h 10mMultiple Airlines
sáb. 12/68:15 amYHM - SEA
1 stop9h 16mMultiple Airlines
Deal found 10/26$400
This Trip.com deal was found by Cheapflights users on 10/26. 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.
dom. 11/233:10 pmSEA - YHM
1 stop23h 07mWestJet
dom. 11/306:10 pmYHM - SEA
1 stop23h 10mWestJet
Deal found 10/26$407
This Kiwi.com deal was found by Cheapflights users on 10/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/113:10 pmSEA - YHM
1 stop29h 37mMultiple Airlines
jue. 12/186:10 pmYHM - SEA
1 stop23h 10mMultiple Airlines
Deal found 10/26$455
This Jettzy deal was found by Cheapflights users on 10/26. 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 Jettzy is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/103:10 pmSEA - YHM
1 stop23h 07mWestJet
mié. 12/176:10 pmYHM - SEA
1 stop23h 10mWestJet
Deal found 10/26$478
This Mytrip deal was found by Cheapflights users on 10/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/215:50 amSEA - YHM
1 stop10h 10mMultiple Airlines
dom. 11/308:15 amYHM - SEA
1 stop11h 31mMultiple Airlines
Deal found 10/27$497
This Expedia deal was found by Cheapflights users on 10/27. 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.
dom. 11/2311:10 pmSEA - YHM
2 stops15h 07mMultiple Airlines
jue. 11/276:10 pmYHM - SEA
2 stops17h 49mMultiple Airlines
Deal found 10/27$506

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 octubre 28, 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

jue. 1/15

3:10 pm-1:22 pm

1 stop19h 12m

Hamilton

dom. 1/18

6:10 pm-2:20 pm

1 stop23h 10m

$295

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

jue. 1/15

3:10 pm-1:22 pm

1 stop19h 12m

Hamilton

lun. 1/19

6:10 pm-2:20 pm

1 stop23h 10m

$314

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

lun. 11/24

3:10 pm-11:47 pm

1 stop29h 37m

Hamilton

lun. 12/1

6:10 pm-9:03 am

2 stops17h 53m

$379

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

mar. 11/18

3:10 pm-5:17 pm

1 stop23h 07m

Hamilton

jue. 11/20

6:10 pm-2:20 pm

1 stop23h 10m

$384

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

sáb. 11/29

5:50 am-7:00 pm

1 stop10h 10m

Hamilton

sáb. 12/6

8:15 am-2:31 pm

1 stop9h 16m

$400

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

dom. 11/23

3:10 pm-5:17 pm

1 stop23h 07m

Hamilton

dom. 11/30

6:10 pm-2:20 pm

1 stop23h 10m

$407

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

mié. 12/10

3:10 pm-5:17 pm

1 stop23h 07m

Hamilton

mié. 12/17

6:10 pm-2:20 pm

1 stop23h 10m

$478

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

dom. 1/11

8:32 am-10:18 pm

1 stop10h 46m

Hamilton

sáb. 1/17

8:15 am-2:34 pm

1 stop9h 19m

$514

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

mar. 11/18

3:10 pm-5:17 pm

1 stop23h 07m

$155

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

sáb. 12/6

11:10 pm-7:00 pm

1 stop16h 50m

$155

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

Showing 1-10 of 17 results
1
2

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 October.
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 $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?

    Airlines like WestJet fly from Seattle to Hamilton, Ontario in about 19h 12m. 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 $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.

Alternative routes for Seattle to Hamilton

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Pearson Intl flights
Seattle to Pierre Elliott Trudeau Intl flights
Portland to Pearson Intl flights
Seattle to Toronto Island flights
Seattle to Region of Waterloo Intl flights
Portland to Pierre Elliott Trudeau Intl flights
Seattle to Ottawa flights
Portland to Toronto Island flights
Portland to Ottawa flights
Spokane to Pearson Intl flights
Seattle to London flights
Pasco to Pearson Intl flights
Bellingham to Pearson Intl flights
Pasco to Pierre Elliott Trudeau Intl flights
Spokane to Hamilton flights
Bellingham to Pierre Elliott Trudeau Intl flights
Bellingham to Ottawa flights
Seattle to Thunder Bay flights
Seattle to Timmins flights
Walla Walla to Pierre Elliott Trudeau Intl flights

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.