$146 Cheap Flights from Hamilton (YHM) to Seattle (SEA)

View $146 flight on Tue, Dec 2, 2025Opens in a new window

Popular airlines from John C. Munro Hamilton Intl. Airport (YHM) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Hamilton to Seattle (YHM-SEA)

Prices were available within the past 7 days and start at $146 for one-way flights and $241 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Tue, Nov 25 - Sat, Nov 29
YHM
Hamilton
SEA
Seattle
$241 Roundtrip, found 1 day ago
$241
Roundtrip
found 1 day ago
Select Air Canada flight, departing Tue, Nov 25 from Hamilton to Seattle, returning Sat, Nov 29, priced at $241 found 1 day ago
Air Canada
Wed, Nov 26 - Sun, Nov 30
YHM
Hamilton
SEA
Seattle
$249 Roundtrip, found 1 day ago
$249
Roundtrip
found 1 day ago
Select Air Canada flight, departing Wed, Nov 26 from Hamilton to Seattle, returning Sun, Nov 30, priced at $249 found 1 day ago
Air Canada
Wed, Nov 26 - Wed, Dec 3
YHM
Hamilton
SEA
Seattle
$256 Roundtrip, found 3 days ago
$256
Roundtrip
found 3 days ago
Select Air Canada flight, departing Wed, Nov 26 from Hamilton to Seattle, returning Wed, Dec 3, priced at $256 found 3 days ago
Air Canada
Sun, Dec 7 - Wed, Dec 17
YHM
Hamilton
SEA
Seattle
$264 Roundtrip, found 3 days ago
$264
Roundtrip
found 3 days ago
Select Air Canada flight, departing Sun, Dec 7 from Hamilton to Seattle, returning Wed, Dec 17, priced at $264 found 3 days ago
Air Canada
Mon, Feb 16 - Sun, Feb 22
YHM
Hamilton
SEA
Seattle
$272 Roundtrip, found 3 days ago
$272
Roundtrip
found 3 days ago
Select Air Canada flight, departing Mon, Feb 16 from Hamilton to Seattle, returning Sun, Feb 22, priced at $272 found 3 days ago
Air Canada
Tue, Nov 25 - Sat, Nov 29
YHM
Hamilton
SEA
Seattle
$305 Roundtrip, found 1 day ago
$305
Roundtrip
found 1 day ago
Select Air Canada flight, departing Tue, Nov 25 from Hamilton to Seattle, returning Sat, Nov 29, priced at $305 found 1 day ago
Air Canada
Sat, Nov 22 - Sat, Nov 29
YHM
Hamilton
SEA
Seattle
$306 Roundtrip, found 1 hour ago
$306
Roundtrip
found 1 hour ago
Select Air Canada flight, departing Sat, Nov 22 from Hamilton to Seattle, returning Sat, Nov 29, priced at $306 found 1 hour ago
Air Canada
Wed, Nov 26 - Sun, Nov 30
YHM
Hamilton
SEA
Seattle
$313 Roundtrip, found 1 day ago
$313
Roundtrip
found 1 day ago
Select Air Canada flight, departing Wed, Nov 26 from Hamilton to Seattle, returning Sun, Nov 30, priced at $313 found 1 day ago
Air Canada
Mon, Dec 1 - Tue, Dec 2
YHM
Hamilton
SEA
Seattle
$316 Roundtrip, found 3 days ago
$316
Roundtrip
found 3 days ago
Select Air Canada flight, departing Mon, Dec 1 from Hamilton to Seattle, returning Tue, Dec 2, priced at $316 found 3 days ago
WestJet
Tue, Apr 14 - Tue, Apr 28
YHM
Hamilton
SEA
Seattle
$410 Roundtrip, found 2 days ago
$410
Roundtrip
found 2 days ago
Select WestJet flight, departing Tue, Apr 14 from Hamilton to Seattle, returning Tue, Apr 28, priced at $410 found 2 days ago

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $405
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $405

Frequently asked questions

How much does a flight from John C. Munro Hamilton Intl. Airport (YHM) to Seattle - Tacoma Intl. Airport (SEA) cost?
Get a cheap one-way flight from $146 or cheap return flight from $241 from John C. Munro Hamilton Intl. Airport (YHM) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from John C. Munro Hamilton Intl. Airport (YHM) to Seattle - Tacoma Intl. Airport (SEA)?
The cheapest month to fly from YHM to SEA is November, when demand is low. Off-peak season is typically when airlines offer lower prices between these airports.
Which airlines fly direct from John C. Munro Hamilton Intl. Airport (YHM) to Seattle - Tacoma Intl. Airport (SEA)?
There are no direct routes from Hamilton, ON (YHM-John C. Munro Hamilton Intl.) to Seattle - Tacoma Intl. Airport (SEA). However, there are other airports with nonstop flights. Board your plane at Pearson Intl. Airport (YYZ) and fly straight to Seattle without layovers.
What is the cheapest airline that flies from John C. Munro Hamilton Intl. Airport (YHM) to Seattle - Tacoma Intl. Airport (SEA)?
To find the cheapest airline that'll fly you from YHM to SEA, use Expedia's filter tool. Customize your search based on your travel style, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from John C. Munro Hamilton Intl. Airport (YHM) to Seattle - Tacoma Intl. Airport (SEA)?
Direct flights from John C. Munro Hamilton Intl. Airport (YHM) to Seattle - Tacoma Intl. Airport (SEA) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your dates and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from YHM to SEA?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from John C. Munro Hamilton Intl. Airport (YHM) to Seattle - Tacoma Intl. Airport (SEA)?
To land at Seattle - Tacoma Intl. Airport (SEA) without delays, choose a flight that leaves from John C. Munro Hamilton Intl. Airport (YHM) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from John C. Munro Hamilton Intl. Airport (YHM) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Holding off until just before your departure to book a ticket from YHM to SEA often results in higher prices. While you might find some last-minute discounts, there's no guarantee. Be flexible with your itinerary to boost your chances of snagging a bargain.
Is it cheaper to book a YHM to SEA flight and hotel package?
Opting for a YHM to SEA flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip in one place. Pick from our extensive range of stays and then add car rentals, flights and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from John C. Munro Hamilton Intl. Airport (YHM) to Seattle - Tacoma Intl. Airport (SEA)?
In most instances, you can modify or cancel your YHM to SEA flight. However, there may be additional charges, especially if you booked more than 24 hours ago. Double-check your itinerary for the airline's fees and policies on flight changes, or if you'd like further details, head to our Customer Service portal.

Travel information

Origin airport
John C. Munro Hamilton Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Air Canada, WestJet
Roundtrip price
$240
Distance
2054 mi

Book with confidence

Hamilton to Seattle Flights

The cheapest times to fly from Hamilton to Seattle

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Hamilton to Seattle are during the month of November. You can find some of the cheapest flights from Hamilton to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Hamilton to Seattle

Sunday is one of the best days to book for cheap flights from Hamilton to Seattle: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Hamilton to Seattle

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Hamilton to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $146 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Hamilton to Seattle flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Hamilton to Seattle airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Hamilton to Seattle Flights

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