Find flights
When to book
Airlines
FAQs

Cheap flights from Hamilton, ON to Seattle from C$ 204

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 21/1. Fares are subject to change and may not be available on all flights or dates of travel.
YHM — SEA
27 Nov — 4 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap 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 28 October 2025.

Round-trip from

C$ 348

One-way from

C$ 204

Popular in

March

Cheapest in

August

Average price

C$ 622
WestJet
  • WestJet
  • 8/1-22/1
  • 2 total stops
  • 42h 22m total
  • Hamilton to Seattle
Search Deals
WestJet
  • WestJet
  • 21/1
  • 1 total stop
  • 23h 10m total
  • Hamilton to Seattle
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (C$ 141 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Find 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 28 October 2025.

Thu 20/116:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Sun 23/113:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Deal found 25/10C$ 499
Sun 23/116:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Sun 30/113:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Deal found 25/10C$ 508
Thu 18/126:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Tue 6/13:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Deal found 26/10C$ 544
Thu 20/116:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Tue 25/113:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Deal found 26/10C$ 569
Sun 7/126:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Wed 10/123:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Deal found 27/10C$ 580
Sat 22/118:15 a.m.YHM - SEA
1 stop14h 01mMultiple Airlines
Sat 29/115:50 a.m.SEA - YHM
1 stop10h 10mMultiple Airlines
Deal found 26/10C$ 617
Wed 10/126:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Wed 17/123:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Deal found 25/10C$ 688
Wed 24/126:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Sun 25/13:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Deal found 26/10C$ 690
Sun 16/116:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Sun 23/113:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Deal found 28/10C$ 743
Mon 10/116:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Sun 16/113:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Deal found 27/10C$ 750
Tue 2/127:55 p.m.YHM - SEA
2 stops21h 40mMultiple Airlines
Thu 4/1210:55 p.m.SEA - YHM
1 stop17h 05mMultiple Airlines
Deal found 27/10C$ 773

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 28 October 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

Thu 8/1

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

1 stop23h 10m

Seattle/Tacoma Intl

Thu 22/1

3:10 p.m.-1:22 p.m.

1 stop19h 12m

C$ 348

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Thu 18/12

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

1 stop23h 10m

Seattle/Tacoma Intl

Tue 6/1

3:10 p.m.-5:17 p.m.

1 stop23h 07m

C$ 544

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Thu 5/2

6:10 p.m.-2:19 p.m.

1 stop23h 09m

Seattle/Tacoma Intl

Mon 9/2

3:10 p.m.-1:20 a.m.

1 stop7h 10m

C$ 551

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 26/11

8:15 a.m.-2:31 p.m.

1 stop9h 16m

Seattle/Tacoma Intl

Wed 3/12

5:50 a.m.-7:00 p.m.

1 stop10h 10m

C$ 569

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Tue 17/3

5:50 a.m.-2:19 p.m.

1 stop11h 29m

Seattle/Tacoma Intl

Mon 23/3

8:00 a.m.-10:18 p.m.

1 stop11h 18m

C$ 649

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 18/3

6:10 p.m.-2:19 p.m.

1 stop23h 09m

Seattle/Tacoma Intl

Sun 22/3

3:10 p.m.-1:20 a.m.

1 stop7h 10m

C$ 656

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Sat 22/11

8:15 a.m.-2:31 p.m.

1 stop9h 16m

Seattle/Tacoma Intl

Sat 29/11

5:50 a.m.-7:00 p.m.

1 stop10h 10m

C$ 659

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Fri 20/2

2:35 p.m.-10:21 a.m.

2 stops22h 46m

Seattle/Tacoma Intl

Sun 22/2

3:10 p.m.-1:20 a.m.

1 stop7h 10m

C$ 741

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Sun 16/11

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

1 stop23h 10m

Seattle/Tacoma Intl

Sun 23/11

3:10 p.m.-5:17 p.m.

1 stop23h 07m

C$ 743

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Thu 2/4

6:10 p.m.-2:19 p.m.

1 stop23h 09m

Seattle/Tacoma Intl

Thu 30/4

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

1 stop7h 35m

C$ 747

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/10

Showing 1-10 of 19 results
1
2

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, May is the cheapest month in which you can book a flight from Hamilton, Ontario to Seattle (average of C$ 129). Flying from Hamilton, Ontario to Seattle in June is currently the most expensive (average of C$ 348). 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 28 October 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 28 October 2025.
Read through reviews of airlines operating flights from Hamilton to Seattle, such as WestJet and Air Canada. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
WestJet
7.2
Good
3,148 reviews
Check prices

Boarding

7.4

Comfort

7.1

Crew

7.9

Entertainment

6.1

Overall

7.2

Food

6.2

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
3,148 reviews
WestJet
7.2
Good
3,148 reviews
Check prices

Boarding

7.4

Comfort

7.1

Crew

7.9

Entertainment

6.1

Overall

7.2

Food

6.2

Reviews

1 / 20
6.0
Good

Deb,Jan 2025

YYZ - YYC

Boarding went smoothly, you didn't accept debit card for food on flight
Air Canada
7.1
Good
10,371 reviews
WestJet
7.2
Good
3,148 reviews
Check prices

Boarding

7.4

Comfort

7.1

Crew

7.9

Entertainment

6.1

Overall

7.2

Food

6.2

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 are the cheapest airlines flying from Hamilton, Ontario to Seattle round-trip?

    Cheapflights users have booked flights from Hamilton, Ontario to Seattle round-trip from C$ 217. Another airline that can offer you cheap pricing is Air Canada. WestJet is currently priced 61% below the average price you’ll pay for this route.

  • 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, May is the cheapest month in which you can book a flight from Hamilton, Ontario to Seattle (average of C$ 129). Flying from Hamilton, Ontario to Seattle in June is currently the most expensive (average of C$ 348). 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
Tacoma
Mukilteo
Bothell
Cashmere
Renton
Olympia
Marysville
Lynnwood

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 Hamilton to Seattle

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

Top 2 airlines flying from Hamilton to Seattle

Discover the top 2 airlines 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 28 October 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 217AverageC$ 397FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 394AverageC$ 693FlexibilityNo cancel feeOn-time67%
Search Air Canada 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.

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.