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Cheap flights from Seattle to Hamilton, ON from C$ 168

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 29/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YHM
11 ene. — 18 ene.1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Hamilton

Enter your travel dates to find the best prices.

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 12 diciembre 2025.

vie. 26/128:05 a.m.SEA - YHM
1 stop12h 42mMultiple Airlines
mié. 31/128:15 a.m.YHM - SEA
1 stop13h 35mMultiple Airlines
Deal found 10/12C$ 1,434
mar. 30/128:05 a.m.SEA - YHM
1 stop12h 42mMultiple Airlines
lun. 5/18:15 a.m.YHM - SEA
1 stop9h 12mMultiple Airlines
Deal found 11/12C$ 1,441
jue. 25/123:10 p.m.SEA - YHM
1 stop19h 12mWestJet
mar. 30/125:45 a.m.YHM - SEA
1 stop11h 35mWestJet
Deal found 10/12C$ 1,488
mar. 30/128:05 a.m.SEA - YHM
1 stop12h 42mMultiple Airlines
dom. 4/18:15 a.m.YHM - SEA
1 stop13h 35mMultiple Airlines
Deal found 9/12C$ 1,507
jue. 25/123:10 p.m.SEA - YHM
1 stop19h 12mWestJet
dom. 28/126:10 p.m.YHM - SEA
2 stops16h 10mWestJet
Deal found 10/12C$ 1,511
mar. 23/123:10 p.m.SEA - YHM
1 stop23h 07mWestJet
dom. 28/126:10 p.m.YHM - SEA
2 stops16h 10mWestJet
Deal found 10/12C$ 1,590
vie. 26/128:05 a.m.SEA - YHM
1 stop12h 42mMultiple Airlines
dom. 28/128:15 a.m.YHM - SEA
1 stop9h 12mMultiple Airlines
Deal found 10/12C$ 1,687
sáb. 20/121:30 p.m.SEA - YHM
2 stops24h 47mWestJet
jue. 25/126:10 p.m.YHM - SEA
2 stops16h 10mWestJet
Deal found 10/12C$ 1,885
mié. 17/123:10 p.m.SEA - YHM
1 stop23h 07mWestJet
lun. 29/126:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Deal found 11/12C$ 1,896
mié. 24/123:10 p.m.SEA - YHM
1 stop23h 07mWestJet
mié. 31/126:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Deal found 11/12C$ 1,957
sáb. 27/123:20 p.m.SEA - YHM
1 stop22h 57mWestJet
mar. 6/15:45 a.m.YHM - SEA
1 stop11h 35mWestJet
Deal found 10/12C$ 2,033

Find flight deals from Seattle to Hamilton

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Hamilton (YHM). 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$ 394

One-way from

C$ 168

Popular in

December

Cheapest in

November

Average price

C$ 763
WestJet
  • WestJet
  • 25/1-1/2
  • 2 total stops
  • 46h 16m total
  • Seattle to Hamilton
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WestJet
  • WestJet
  • 29/3
  • 1 total stop
  • 23h 06m total
  • Seattle to Hamilton
Search Deals
High demand for flights, 7% potential price rise
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Cheapest flight prices on average. 3% potential price decrease (C$ 28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Hamilton 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 Seattle to Hamilton that are best for you.

Fly from

Seattle

Fly to

Hamilton

Route

Depart

Return

Price

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

dom. 25/1

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

1 stop23h 07m

Hamilton

dom. 1/2

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

1 stop23h 09m

C$ 394

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

jue. 8/1

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

1 stop19h 12m

Hamilton

dom. 11/1

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

1 stop23h 10m

C$ 405

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

dom. 3/5

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

1 stop14h 35m

Hamilton

vie. 8/5

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

1 stop17h 28m

C$ 407

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

mar. 12/5

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

1 stop14h 35m

Hamilton

mar. 19/5

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

1 stop10h 08m

C$ 407

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

mar. 26/5

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

1 stop14h 35m

Hamilton

mié. 3/6

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

1 stop17h 28m

C$ 407

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

mié. 20/5

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

1 stop14h 35m

Hamilton

sáb. 6/6

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

1 stop10h 08m

C$ 422

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

jue. 8/1

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

1 stop19h 12m

Hamilton

jue. 15/1

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

2 stops29h 07m

C$ 484

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

mié. 21/1

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

1 stop23h 07m

Hamilton

sáb. 24/1

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

2 stops29h 07m

C$ 488

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

jue. 8/1

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

1 stop19h 12m

Hamilton

dom. 11/1

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

3 stops33h 05m

C$ 523

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

dom. 25/1

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

1 stop10h 10m

Hamilton

dom. 1/2

8:15 a.m.-10:25 a.m.

2 stops29h 10m

C$ 553

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/12

Showing 1-10 of 21 results
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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.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Hamilton

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

Currently, March is the cheapest month in which you can book a flight from Seattle to Hamilton, Ontario (average of C$ 167). Flying from Seattle to Hamilton, Ontario in May is currently the most expensive (average of C$ 375). 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.

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.

  • How long is the flight from Seattle to Hamilton, Ontario?

    WestJet can get you from Seattle to Hamilton, Ontario in just under 23h 07m. Your travel time can differ by up to . Airlines will cover a distance of 3304 km.

  • 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.

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

    Currently, March is the cheapest month in which you can book a flight from Seattle to Hamilton, Ontario (average of C$ 167). Flying from Seattle to Hamilton, Ontario in May is currently the most expensive (average of C$ 375). 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

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

Cheapflights helps you find that perfect flight to Hamilton from Seattle 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 Seattle to Hamilton with no change fees?

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

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