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Cheap flights from Hamilton, ON to Seattle from C$ 215

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 1/3. Fares are subject to change and may not be available on all flights or dates of travel.
YHM — SEA
11 ene. — 18 ene.1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Hamilton to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from Hamilton to Seattle
Explore the most affordable flight options available from Hamilton to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 diciembre 2025.

mié. 24/126:10 p.m.YHM - SEA
1 stop23h 10mWestJet
mar. 6/13:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Deal found 9/12C$ 987
mié. 17/128:15 a.m.YHM - SEA
1 stop9h 21mMultiple Airlines
mié. 7/18:32 a.m.SEA - YHM
1 stop10h 46mMultiple Airlines
Deal found 10/12C$ 996
jue. 25/126:10 p.m.YHM - SEA
2 stops16h 10mWestJet
jue. 1/13:10 p.m.SEA - YHM
1 stop19h 12mWestJet
Deal found 9/12C$ 1,011
dom. 21/126:10 p.m.YHM - SEA
2 stops16h 10mWestJet
jue. 1/11:30 p.m.SEA - YHM
2 stops20h 52mWestJet
Deal found 10/12C$ 1,027
mié. 24/126:10 p.m.YHM - SEA
2 stops18h 54mWestJet
jue. 1/19:25 a.m.SEA - YHM
2 stops24h 57mWestJet
Deal found 9/12C$ 1,070
mié. 24/128:15 a.m.YHM - SEA
1 stop9h 12mMultiple Airlines
mar. 6/18:05 a.m.SEA - YHM
1 stop11h 25mMultiple Airlines
Deal found 9/12C$ 1,114
mié. 24/126:10 p.m.YHM - SEA
1 stop23h 10mWestJet
dom. 4/13:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Deal found 9/12C$ 1,212
mar. 30/125:45 a.m.YHM - SEA
2 stops28h 35mWestJet
sáb. 3/15:30 p.m.SEA - YHM
2 stops44h 47mWestJet
Deal found 12/12C$ 1,215
mié. 24/126:10 p.m.YHM - SEA
1 stop23h 10mWestJet
dom. 28/123:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Deal found 9/12C$ 1,222
dom. 28/126:10 p.m.YHM - SEA
2 stops16h 10mWestJet
sáb. 3/17:45 p.m.SEA - YHM
2 stops18h 32mWestJet
Deal found 12/12C$ 1,294

Find flight deals from Hamilton to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Hamilton (YHM) to Seattle (SEA). 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 12 diciembre 2025.

Round-trip from

C$ 338

One-way from

C$ 215

Popular in

June

Cheapest in

February

Average price

C$ 556
WestJet
  • WestJet
  • 28/1-5/2
  • 2 total stops
  • 42h 21m total
  • Hamilton to Seattle
Search Deals
WestJet
  • WestJet
  • 1/3
  • 1 total stop
  • 23h 09m total
  • Hamilton to Seattle
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 78 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Hamilton to Seattle 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 629,999 searches. Data last updated 12 diciembre 2025.
Use the filters below to find and compare flights from Hamilton to Seattle that are best for you.

Fly from

Hamilton

Fly to

Seattle

Route

Depart

Return

Price

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

mié. 28/1

6:10 p.m.-2:20 p.m.

1 stop23h 10m

Seattle/Tacoma Intl

jue. 5/2

3:10 p.m.-1:21 p.m.

1 stop19h 11m

C$ 338

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

mié. 21/1

6:10 p.m.-2:20 p.m.

1 stop23h 10m

Seattle/Tacoma Intl

dom. 1/2

3:10 p.m.-5:16 p.m.

1 stop23h 06m

C$ 345

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

vie. 22/5

6:00 a.m.-8:28 p.m.

1 stop17h 28m

Seattle/Tacoma Intl

lun. 25/5

7:05 a.m.-12:40 a.m.

1 stop14h 35m

C$ 345

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

jue. 30/4

6:00 a.m.-8:28 p.m.

1 stop17h 28m

Seattle/Tacoma Intl

jue. 7/5

7:05 a.m.-12:40 a.m.

1 stop14h 35m

C$ 345

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

dom. 17/5

6:00 a.m.-8:28 p.m.

1 stop17h 28m

Seattle/Tacoma Intl

mar. 19/5

7:05 a.m.-12:40 a.m.

1 stop14h 35m

C$ 365

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

mié. 21/1

8:15 a.m.-2:20 p.m.

3 stops33h 05m

Seattle/Tacoma Intl

dom. 1/2

3:10 p.m.-5:16 p.m.

1 stop23h 06m

C$ 527

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

jue. 15/1

8:15 a.m.-10:22 a.m.

2 stops29h 07m

Seattle/Tacoma Intl

jue. 22/1

3:10 p.m.-7:00 p.m.

2 stops24h 50m

C$ 572

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

dom. 31/5

6:00 a.m.-8:28 p.m.

1 stop17h 28m

Seattle/Tacoma Intl

mié. 10/6

2:05 p.m.-12:40 a.m.

1 stop7h 35m

C$ 572

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

mié. 3/6

6:00 a.m.-1:08 p.m.

1 stop10h 08m

Seattle/Tacoma Intl

mié. 10/6

2:05 p.m.-12:40 a.m.

1 stop7h 35m

C$ 575

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

mar. 28/4

6:00 a.m.-8:28 p.m.

1 stop17h 28m

C$ 215

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

Showing 1-10 of 20 results
1
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Best time to book a flight from Hamilton to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Hamilton 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 Hamilton to Seattle

What is the cheapest month to book a flight from Hamilton, Ontario to Seattle?

Currently, December is the cheapest month in which you can book a flight from Hamilton, Ontario to Seattle (average of C$ 181). Flying from Hamilton, Ontario to Seattle in June is currently the most expensive (average of C$ 343). 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.

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

Find hourly flight availability from Hamilton to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 12 diciembre 2025.

It’s typically best to fly out from Hamilton, Ontario to Seattle at noon. Doing so could potentially save you 22% on the flight price compared to flying in the evening, which is usually more expensive.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated 12 diciembre 2025.
Read through reviews of airlines operating flights from Hamilton to Seattle, such as WestJet. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
WestJet
7.2
Good
3,195 reviews
Check prices

Food

6.2

Boarding

7.4

Entertainment

6.1

Overall

7.2

Comfort

7.1

Crew

7.9

Reviews

1 / 20
6.0
Good

Deb,Jan 2025

YYZ - YYC

Boarding went smoothly, you didn't accept debit card for food on flight
WestJet
7.2
Good
3,195 reviews
WestJet
7.2
Good
3,195 reviews
Check prices

Food

6.2

Boarding

7.4

Entertainment

6.1

Overall

7.2

Comfort

7.1

Crew

7.9

Reviews

1 / 20
6.0
Good

Deb,Jan 2025

YYZ - YYC

Boarding went smoothly, you didn't accept debit card for food on flight

Related info for your journey

Find useful and relevant information for your journey from Hamilton to Seattle. 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 Hamilton, Ontario to Seattle?

    WestJet can get you from Hamilton, Ontario to Seattle in just under 23h 10m. Your travel time can differ by up to . Airlines will cover a distance of 3304 km.

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

    Cheapflights users have booked flights from Hamilton, Ontario to Seattle round-trip from C$ 214.

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

    Yes. In addition to deals on Hamilton to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Hamilton to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Hamilton to Seattle.

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

    Yes. Cheapflights offers flight deals from Hamilton to Seattle 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 Hamilton, Ontario to Seattle?

    Currently, December is the cheapest month in which you can book a flight from Hamilton, Ontario to Seattle (average of C$ 181). Flying from Hamilton, Ontario to Seattle in June is currently the most expensive (average of C$ 343). 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

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
SeaTac
Tukwila
Mukilteo
Tacoma
Bothell
Cashmere
Olympia
Renton
Marysville
Lynnwood

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Alternative routes for Hamilton to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Hamilton to Seattle

Discover the top airline that operate flights from Hamilton to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 12 diciembre 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 214AverageC$ 392FlexibilityNo cancel feeOn-time60%
Search WestJet flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Hamilton to Seattle?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Hamilton to Seattle. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Hamilton to Seattle?

Cheapflights helps you find that perfect flight to Seattle from Hamilton by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Hamilton to Seattle with no change fees?

Yes! Cheapflights helps users easily find flights from Hamilton to Seattle with no change fees.

Can Cheapflights notify me if prices for flights from Hamilton to Seattle become cheaper?

Yes! Start tracking prices for Hamilton to Seattle flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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