How long is the flight from London, Ontario to Seattle?

Departing from London, Ontario to Seattle will take you 8h 34m. The distance between London, Ontario and Seattle is about 3219 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

In terms of precipitation, rainfall in Seattle ranges from 18.0 - 168.0 mm per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit Seattle when rainfall is around 18.0 mm.

If weather is an important factor for your trip to Seattle, 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 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

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

When flying from London, Ontario to Seattle, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

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

How can I find direct flights from London to Seattle?

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

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

Yes. Cheapflights offers flight deals from London 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.

C$ 1,092+ Cheap Flights from London, ON to Seattle

Cheap flight deals from London to Seattle

Enter your travel dates to find the best prices.

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Last-minute

Cheapest flights from London to Seattle
Explore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 October 2026.

Sat 21/116:40 a.m. -

1 stop10h 00m

Sat 28/113:13 p.m. -

2 stops35h 22m

Deal found 24/10C$ 1,092

Sat 21/113:25 p.m. -

1 stop8h 34m

Sat 28/117:45 a.m. -

1 stop9h 42m

Deal found 24/10C$ 1,221

Wed 23/129:15 a.m. -

1 stop14h 44m

Sat 2/110:10 a.m. -

2 stops19h 27m

Deal found 20/10C$ 1,305

Wed 23/125:30 a.m. -

3 stops33h 13m

Sat 2/16:00 a.m. -

2 stops23h 37m

Deal found 20/10C$ 1,473

Wed 21/106:10 a.m. -

1 stop15h 35m

Sat 24/107:35 p.m. -

1 stop6h 45m

Deal found 20/10C$ 1,704

Find flight deals from London to Seattle

Round-trip from	C$ 1,092

Delta
21/11-28/11
3 total stops
45h 22m total
London to Seattle

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Sat 21/11

3:25 p.m.-8:59 p.m.

1 stop8h 34m

Seattle/Tacoma Intl

Sat 28/11

7:45 a.m.-8:27 p.m.

1 stop9h 42m

C$ 1,221

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Wed 23/12

9:15 a.m.-8:59 p.m.

1 stop14h 44m

Seattle/Tacoma Intl

Sat 2/1

10:10 a.m.-8:37 a.m.

2 stops19h 27m

C$ 1,305

LondonSeattle

YXU London - SEA Seattle/Tacoma Intl

YXUSEA

London

Wed 23/12

5:30 a.m.-11:43 a.m.

3 stops33h 13m

Seattle/Tacoma Intl

Sat 2/1

6:00 a.m.-8:37 a.m.

2 stops23h 37m

C$ 1,473

Flights are sorted by cheapest round-trip flights first.

Deals found on 24/10

Sorted by cheapest first

Best time to book a flight from London to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from London with our price prediction graph.

YXU-SEA

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.

Related info for your journey

How long is the flight from London, Ontario to Seattle?
Departing from London, Ontario to Seattle will take you 8h 34m. The distance between London, Ontario and Seattle is about 3219 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
Can I find deals for flights from London to Seattle that include hotel bookings?
Yes. In addition to deals on London to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from London to Seattle?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Seattle.
Can I find deals for business class flights from London to Seattle?
Yes. Cheapflights offers flight deals from London 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.

See more FAQs

SeaTac

Kent

Tukwila

Mukilteo

Ellensburg

Renton

Lynnwood

Cashmere

Tacoma

Marysville

Federal Way

Kirkland

Leavenworth

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

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

Certainly. Search results for flights to Seattle from London shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, Cheapflights offers price alerts on London to Seattle flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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Cheap flights from London, ON to Seattle from C$ 1,092

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 21/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from London to Seattle

Cheapest flights from London to SeattleExplore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 October 2026.

Explore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 October 2026.

Best flights from London to SeattleDiscover carefully curated flight deals from London to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 25 October 2026.

Discover carefully curated flight deals from London to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 25 October 2026.

Last-minute flights from London to SeattleDiscover last-minute flight deals from London to Seattle. Data last updated 25 October 2026 and is based on user searches.

Discover last-minute flight deals from London to Seattle. Data last updated 25 October 2026 and is based on user searches.

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Best time to book a flight from London to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from London with our price prediction graph.

Related info for your journey

How long is the flight from London, Ontario to Seattle?

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

How can I find direct flights from London to Seattle?

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

Travelling to a place near Seattle?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for London to Seattle

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Complete your trip

Complete your trip to Seattle by adding a car rental and/or hotel reservation to your travel itinerary.

Direct flights to Washington

Book a non-stop flight to one of these other cities located in Washington.

Search flights from London to Seattle by cabin class

Find flights from London to Seattle, based on your preferred cabin class, be it economy, premium economy, business, or first class.

London and Seattle flights

Browse other London and Seattle flight options. Last updated on 25 October 2026.

Other flights from London

Browse through other flights departing from London. Flights are based on user searches made on Cheapflights and were last updated on 25 October 2026.

Popular flight searches

Check out other popular destinations found by fellow travellers in 2026

Other flights to Seattle

Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 25 October 2026.

Fly with Cheapflights

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

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

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

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

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Book with Flexibility

Travel Smart

Cheapest flights from London to Seattle
Explore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 October 2026.

Best flights from London to Seattle
Discover carefully curated flight deals from London to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 25 October 2026.

Last-minute flights from London to Seattle
Discover last-minute flight deals from London to Seattle. Data last updated 25 October 2026 and is based on user searches.