What is the cheapest airline to fly from Seattle to Hamilton, Ontario round-trip?

Flying on WestJet is currently your cheapest option to Hamilton, Ontario, with prices starting at $296.

In terms of precipitation, rainfall in Hamilton, Ontario ranges from 2.3 - 4.0 inches per month. July is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Hamilton, Ontario when rainfall is around 2.3 in.

If weather is an important factor for your trip to Hamilton, Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

How far in advance should I book a flight from Seattle to Hamilton, Ontario?

To save on the cost of your flight from Seattle to Hamilton, Ontario, book at least 49 days before your planned departure. Booking around this time can save you about 112% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $510 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $719.

What is the cheapest month to fly from Seattle to Hamilton, Ontario?

January is one of the best times of the year to fly to Hamilton, Ontario from Seattle. Prices for January average $414 per person but you can even find prices for as low as $128. The most expensive prices can be found in the month of June. Opting for a January flight can save you 20% on your journey compared to booking in June

What is the cheapest time of day to fly from SEA to YHM?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Hamilton, Ontario as you normally would.

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.

$140+ Flights from Seattle to Hamilton, ON

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Cheap flight deals from Seattle to Hamilton

Round-trip from	$296 (Trip.com)
One-way from	$140 (KAYAK)
Popular in	June
Cheapest in	January
Average price	$490

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 ($63 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).

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Average for round-trip flights in July 2025

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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 July 29, 2025.

Tue 8/192:05 pmSEA - YHM

1 stop7h 36mWestJet

Fri 8/226:00 amYHM - SEA

1 stop9h 58mWestJet

Deal found 7/26

$296

Fri 9/121:15 pmSEA - YHM

1 stop7h 33mMultiple Airlines

Fri 9/192:55 pmYHM - SEA

2 stops10h 21mMultiple Airlines

Deal found 7/29

$359

Best flights from Seattle to Hamilton
Discover carefully curated flight deals from Seattle to Hamilton that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2025.

Tue 8/192:05 pmSEA - YHM

1 stop7h 36mWestJet

Fri 8/226:00 amYHM - SEA

1 stop9h 58mWestJet

Deal found 7/26

$296

Fri 9/121:15 pmSEA - YHM

1 stop7h 33mMultiple Airlines

Fri 9/192:55 pmYHM - SEA

2 stops10h 21mMultiple Airlines

Deal found 7/29

$359

Last-minute flights from Seattle to Hamilton
Discover last-minute flight deals from Seattle to Hamilton. Data last updated July 29, 2025 and is based on user searches.

Mon 8/47:10 amSEA - YHM

2 stops14h 31mWestJet

Tue 8/196:00 amYHM - SEA

1 stop9h 58mWestJet

Deal found 7/27

$643

Thu 8/78:41 amSEA - YHM

1 stop8h 13mMultiple Airlines

Mon 8/116:00 amYHM - SEA

1 stop9h 58mMultiple Airlines

Deal found 7/26

$803

Tue 8/192:05 pmSEA - YHM

1 stop7h 36mWestJet

Fri 8/226:00 amYHM - SEA

1 stop9h 58mWestJet

Deal found 7/26

$296

Fri 8/221:15 pmSEA - YHM

1 stop7h 33mMultiple Airlines

Mon 8/256:00 amYHM - SEA

1 stop9h 58mMultiple Airlines

Deal found 7/27

$418

One-way flights from Seattle to Hamilton
Search for one-way flight options from Seattle to Hamilton. Find affordable one-way fares based on user searches. Data last updated July 29, 2025.

Wed 8/201:50 pmSEA - YHM

1 stop7h 51mWestJet

Deal found 7/27

$140

Mon 9/85:30 amSEA - YHM

2 stops15h 18mMultiple Airlines

Deal found 7/27

$150

Fly from

Fly to

Route

Depart

Return

Price

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 8/19

2:05 pm-12:41 am

1 stop7h 36m

Hamilton

Fri 8/22

6:00 am-12:58 pm

1 stop9h 58m

$296

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 9/12

1:15 pm-11:48 pm

1 stop7h 33m

Hamilton

Fri 9/19

2:55 pm-10:16 pm

2 stops10h 21m

$359

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Wed 8/20

1:50 pm-12:41 am

1 stop7h 51m

$140

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Mon 9/8

5:30 am-11:48 pm

2 stops15h 18m

$150

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

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.

Reviews of airlines servicing Hamilton

Peruse reviews from past customers who have flown with WestJet from Seattle to Hamilton to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

WestJet

7.2

Good

2,972 reviews

Reviews

1 / 20

10.0

Excellent

Sugith,Jan 2025

CUN - YYZ

On time departure. Good service on board. Comfort Plus seating was comfortable.

WestJet

7.2

Good

2,972 reviews

WestJet

7.2

Good

2,972 reviews

Reviews

1 / 20

10.0

Excellent

Sugith,Jan 2025

CUN - YYZ

On time departure. Good service on board. Comfort Plus seating was comfortable.

Related info for your journey

What is the cheapest airline to fly from Seattle to Hamilton, Ontario round-trip?
Flying on WestJet is currently your cheapest option to Hamilton, Ontario, with prices starting at $296.
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.

See more FAQs

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Alternative routes for Seattle to Hamilton

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$140+ 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 8/20. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Seattle to Hamilton with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Seattle to Hamilton

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Seattle to Hamilton

Cheapest flights from Seattle to HamiltonExplore 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 July 29, 2025.

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 July 29, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to Hamilton that are best for you.

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.

Reviews of airlines servicing Hamilton

Peruse reviews from past customers who have flown with WestJet from Seattle to Hamilton to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

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.

What is the cheapest airline to fly from Seattle to Hamilton, Ontario round-trip?

Can I find deals for flights from Seattle to Hamilton that include hotel bookings?

How can I find direct flights from Seattle to Hamilton?

Can I find deals for business class flights from Seattle to Hamilton?

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.

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Book with Flexibility

Travel Smart

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 July 29, 2025.