$122 Cheap Flights from Seattle (SEA) to Hamilton (YHM)

View $122 flight on Wed, Sep 17, 2025Opens in a new window

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Cheap Flights from Seattle to Hamilton (SEA-YHM)

Prices were available within the past 7 days and start at $122 for one-way flights and $250 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Wed, Oct 22 - Mon, Oct 27
SEA
Seattle
YHM
Hamilton
$250 Roundtrip, found 5 days ago
$250
Roundtrip
found 5 days ago
Select Air Canada flight, departing Wed, Oct 22 from Seattle to Hamilton, returning Mon, Oct 27, priced at $250 found 5 days ago
Air Canada
Tue, Sep 9 - Tue, Sep 16
SEA
Seattle
YHM
Hamilton
$294 Roundtrip, found 13 hours ago
$294
Roundtrip
found 13 hours ago
Select Air Canada flight, departing Tue, Sep 9 from Seattle to Hamilton, returning Tue, Sep 16, priced at $294 found 13 hours ago
Air Canada
Wed, Nov 12 - Wed, Nov 19
SEA
Seattle
YHM
Hamilton
$294 Roundtrip, found 2 days ago
$294
Roundtrip
found 2 days ago
Select Air Canada flight, departing Wed, Nov 12 from Seattle to Hamilton, returning Wed, Nov 19, priced at $294 found 2 days ago
WestJet
Tue, Aug 26 - Tue, Sep 2
SEA
Seattle
YHM
Hamilton
$305 Roundtrip, found 15 hours ago
$305
Roundtrip
found 15 hours ago
Select WestJet flight, departing Tue, Aug 26 from Seattle to Hamilton, returning Tue, Sep 2, priced at $305 found 15 hours ago
Air Canada
Fri, Sep 26 - Mon, Oct 6
SEA
Seattle
YHM
Hamilton
$315 Roundtrip, found 21 hours ago
$315
Roundtrip
found 21 hours ago
Select Air Canada flight, departing Fri, Sep 26 from Seattle to Hamilton, returning Mon, Oct 6, priced at $315 found 21 hours ago
Air Canada
Fri, Oct 24 - Mon, Oct 27
SEA
Seattle
YHM
Hamilton
$316 Roundtrip, found 6 days ago
$316
Roundtrip
found 6 days ago
Select Air Canada flight, departing Fri, Oct 24 from Seattle to Hamilton, returning Mon, Oct 27, priced at $316 found 6 days ago
Alaska Airlines
Tue, Oct 7 - Wed, Oct 15
SEA
Seattle
YHM
Hamilton
$328 Roundtrip, found 6 days ago
$328
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Tue, Oct 7 from Seattle to Hamilton, returning Wed, Oct 15, priced at $328 found 6 days ago
Alaska Airlines
Tue, Oct 7 - Sun, Oct 26
SEA
Seattle
YHM
Hamilton
$334 Roundtrip, found 6 hours ago
$334
Roundtrip
found 6 hours ago
Select Alaska Airlines flight, departing Tue, Oct 7 from Seattle to Hamilton, returning Sun, Oct 26, priced at $334 found 6 hours ago
Air Canada
Sun, Sep 21 - Sun, Sep 28
SEA
Seattle
YHM
Hamilton
$340 Roundtrip, found 3 days ago
$340
Roundtrip
found 3 days ago
Select Air Canada flight, departing Sun, Sep 21 from Seattle to Hamilton, returning Sun, Sep 28, priced at $340 found 3 days ago
WestJet
Tue, Aug 26 - Tue, Sep 2
SEA
Seattle
YHM
Hamilton
$351 Roundtrip, found 15 hours ago
$351
Roundtrip
found 15 hours ago
Select WestJet flight, departing Tue, Aug 26 from Seattle to Hamilton, returning Tue, Sep 2, priced at $351 found 15 hours ago
Flights from Seattle (SEA) to Hamilton (YHM)
Origin airport
Seattle - Tacoma Intl.
Destination airport
John C. Munro Hamilton Intl.
Airlines serving
Air Canada, WestJet
Roundtrip price
$250
Distance
2054 mi

Seattle to Hamilton Flights

The cheapest times to fly from Seattle to Hamilton

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 Seattle to Hamilton are during the month of October. You can find some of the cheapest flights from Seattle to Hamilton with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Hamilton

Sunday is one of the best days to book for cheap flights from Seattle to Hamilton: 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 Seattle to Hamilton

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 Seattle to Hamilton in 2025. You can also book with separate airlines for your outbound and return journeys, from $122 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 Seattle to Hamilton 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 Seattle to Hamilton 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.

 

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to John C. Munro Hamilton Intl. Airport (YHM) cost?
Discover the latest flight deals from SEA to YHM by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from SEA to YHM?
The cheapest flights from SEA to YHM are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from SEA to YHM?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from SEA to YHM. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to John C. Munro Hamilton Intl. Airport (YHM)?
There are no daily direct flights from Seattle - Tacoma Intl. Airport (SEA) to John C. Munro Hamilton Intl. Airport (YHM). But you can book flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be on your way before you know it.
What day of the week has the most flights from SEA to YHM?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can change based on various factors, including the time of year and carrier.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to John C. Munro Hamilton Intl. Airport (YHM)?
To reach John C. Munro Hamilton Intl. Airport (YHM) without delays, book a flight that leaves from Seattle - Tacoma Intl. Airport (SEA) before 3 PM. The likelihood 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.
What airports do you fly into for Hamilton from Seattle - Tacoma Intl. Airport (SEA)?
If you're traveling on a direct flight from Seattle - Tacoma Intl. Airport (SEA) to Hamilton, Pearson Intl. Airport (YYZ) is the only airport you can land at.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to John C. Munro Hamilton Intl. Airport (YHM) last-minute?
Booking your ticket from SEA to YHM shortly before your journey is usually more expensive. But if there's some wiggle room with your departure times and dates, you could land a cheap last-minute fare.
Is it cheaper to book a SEA to YHM flight and hotel package?
Compared with arranging flights and hotels separately, booking a SEA to YHM flight and hotel package with Expedia could result in significant savings. Better still, having everything in one easy place takes the hassle out of travel planning. Simply secure your flights and select from our wide range of hotels, then customize your trip with other add-ons like car rentals and activities.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to John C. Munro Hamilton Intl. Airport (YHM)?
It's usually possible to cancel or reschedule your SEA to YHM flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find further details on our Customer Service portal.

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*Available to One Key members.