Question 1

What’s the fastest layover option from London, Ontario to Seattle?

Accepted Answer

Flights via Toronto (YYZ) have the shortest average one-way travel time for 1-stop routes: 7h 46m.

Question 2

Which airport typically offers the quickest layover for flights from London, Ontario to Seattle?

Accepted Answer

Flights via Toronto (YYZ) offer the fastest connection on this route, with an average layover time of 1h 38m.

Question 3

What’s the top layover airport for flights from London, Ontario to Seattle?

Accepted Answer

Calgary (YYC) – chosen by Cheapflights users on 89% of one-stop itineraries from London, Ontario to Seattle on Cheapflights.

Question 4

What’s the cheapest layover airport for flights from London, Ontario to Seattle?

Accepted Answer

Toronto (YYZ) is the most affordable 1-stop option, with an average round-trip price of C$ 389.

Question 5

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

Accepted Answer

Currently, January is the cheapest month in which you can book a flight from London, Ontario to Seattle (average of C$ 262). Flying from London, Ontario to Seattle in December is currently the most expensive (average of C$ 353). 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.

Question 6

What is the cheapest day to fly from London, Ontario to Seattle?

Accepted Answer

Travelers seeking maximum savings on their London, Ontario to Seattle flight should consider departing on Friday afternoons when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Question 7

E

Accepted Answer

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.

Question 8

E

Accepted Answer

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).

Question 9

What are the most popular airlines that fly from London, Ontario to Seattle?

Accepted Answer

Consider Air Canada, United Airlines or WestJet when booking your flight. These represent the most popular airlines when flying from London, Ontario to Seattle.

Question 10

What is the cheapest day to fly round-trip from London, Ontario to Seattle?

Accepted Answer

Flights from London, Ontario to Seattle are generally found to be more expensive on Friday. This shouldn't discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Seattle.

Question 11

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

Accepted Answer

One of the essential ways to save on airfare from London, Ontario to Seattle is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 2% on airfare.

Question 12

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

Accepted Answer

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

Question 13

How can I find direct flights from London to Seattle?

Accepted Answer

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

Question 14

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

Accepted Answer

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.

Question 15

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

Accepted Answer

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Seattle from London today with Cheapflights!

Question 16

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

Accepted Answer

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!

Question 17

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

Accepted Answer

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.

Question 18

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

Accepted Answer

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.

Airline	Cheapest	Average	Flexibility	On-time
WestJet	CheapestC$ 240	AverageC$ 383	FlexibilityNo cancel fee	On-time60%	Search WestJet flights
United Airlines	CheapestC$ 278	AverageC$ 295	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Air Canada	CheapestC$ 361	AverageC$ 417	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights

Cheap flights from London, ON to Seattle from C$ 294

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 13/9. Fares are subject to change and may not be available on all flights or dates of travel.

Find 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 30 July 2025.

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 30 July 2025.

Cheapflights Fare Finder

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

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.

Cheapflights Insights

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

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

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

Find hourly flight availability from London 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 30 July 2025.

What’s the top layover airport for flights from London, Ontario to Seattle?

Share of one-stop round-trip flights from London, Ontario to Seattle chosen by Cheapflights users in the past 12 months, using the same layover each way.

What’s the cheapest layover airport for flights from London, Ontario to Seattle?

Average round-trip fare for 1-stop flights from London, Ontario to Seattle, chosen by Cheapflights users in the past 12 months, with the same layover each way.

What’s the fastest layover option from London, Ontario to Seattle?

Shortest average travel time for 1-stop one-way flights from London, Ontario to Seattle, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Which airport typically offers the quickest layover for flights from London, Ontario to Seattle?

Average layover duration for 1-stop one-way flights from London, Ontario to Seattle, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Reviews of airlines servicing Seattle

Read through reviews of airlines operating flights from London 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.

Related info for your journey

Find useful and relevant information for your journey from London to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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?

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

Travelling to a place near Seattle?

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Alternative routes for London to Seattle

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Top 3 airlines flying from London to Seattle

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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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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 30 July 2025.