Question 1

What’s the top stopover airport for flights from London to Seattle?

Accepted Answer

Reykjavik (KEF) – chosen by Cheapflights users on 79% of one-stop itineraries from London to Seattle on Cheapflights.

Question 2

Which airport typically offers the quickest stopover for flights from London to Seattle?

Accepted Answer

Flights via Salt Lake City (SLC) offer the fastest connection on this route, with an average stopover time of 0h 52m.

Question 3

What’s the fastest stopover option from London to Seattle?

Accepted Answer

Flights via Paris (CDG) have the shortest average one-way travel time for one-stop routes: 13h 00m.

Question 4

What’s the cheapest stopover airport for flights from London to Seattle?

Accepted Answer

Calgary (YYC) is the most affordable one-stop option, with an average return flight price of £412.

Question 5

How long is the flight from London to Seattle?

Accepted Answer

A quick flight from London to Seattle can take about 13h 15m. Air Canada provides one of the quickest options available for as low as £462. There are 4783 mi between London and Seattle. This flight may include one or multiple stops.

Question 6

What are the cheapest airlines flying from London to Seattle round-trip?

Accepted Answer

Icelandair, at £325, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Air France and Lufthansa. Icelandair is priced at 41% lower than the current average price of a flight leaving 3 months from now.

Question 7

How far ahead should I book a flight from London to Seattle?

Accepted Answer

Booking 90 days in advance of your planned departure date is, on average, the best time to get cheap flights from London to Seattle. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Question 8

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

Accepted Answer

Currently, January is the cheapest month in which you can book a flight from London to Seattle (average of £622). Flying from London to Seattle in July is currently the most expensive (average of £946). 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 9

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

Accepted Answer

Travellers seeking maximum savings on their London to Seattle flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday at midday flights should be avoided if possible as fares are typically the most expensive at this time.

Question 10

Weekly flight availability from London to Seattle

Accepted Answer

The most flights from LON to SEA are scheduled on a Monday (21 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (10 on average).

Question 11

E

Accepted Answer

In terms of precipitation, rainfall in Seattle ranges from 18.0 - 168.0 inches 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 12

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 13

What are the most popular routes from London to Seattle?

Accepted Answer

When deciding which route to take from London to Seattle consider London Heathrow - Seattle/Tacoma Intl, London Gatwick - Seattle/Tacoma Intl or London City - Seattle/Tacoma Intl as they are the most popular.

Question 14

What are the cheapest flights from London to Seattle?

Accepted Answer

On average you can expect to pay £1,547 for a flight from London to Seattle. The cheapest flight overall is £478 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £371.

Question 15

What are the most reliable airlines from London to Seattle?

Accepted Answer

Consider Scandinavian Airlines (93%), KLM (89%) or Air France (89%) when booking your flight. These represent the most reliable airlines when flying from London to Seattle.

Question 16

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

Accepted Answer

Before booking your flight from London to Seattle check out the most popular airlines for this route: American Airlines, Air Canada or Air France.

Question 17

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

Accepted Answer

Leaving on a Tuesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 17% on the overall cost on flights from London to Seattle.

Question 18

How far in advance should I book a flight from London to Seattle?

Accepted Answer

Travelers have found it’s best to book a flight 45 days in advance to save up to 41% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 45 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from London to Seattle 1-2 weeks in advance for as low as £549, or £796 for flights within the next 24 hours.

Question 19

What is the cheapest month to fly from London to Seattle?

Accepted Answer

Due to multiple factors, expect to potentially pay more when booking in August. For low rates, January can be a great choice for travel to Seattle. Flights to Seattle from London in January are about £552 on average during January, but can be found for as low as £325.

Question 20

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

Accepted Answer

Unlike in the afternoon, when flights are generally more expensive, you can save up to 17% on flights from London to Seattle by exploring options for tickets in the evening.

Question 21

What airport do you fly into for flights to Seattle from London?

Accepted Answer

Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Seattle from London. Booking flights from London to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 17 daily inbound flights from London from 14 different airlines.

Question 22

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 holiday packages that include both flights and hotel.

Question 23

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 24

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 25

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

Accepted Answer

Cheapflights makes it easy to find London to Seattle flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Question 26

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

Accepted Answer

Millions of users choose and trust Cheapflights to book the best flight deals from London to Seattle for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Question 27

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 28

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.

Round-trip from	£462
One-way from	£377
Popular in	August
Cheapest in	January
Average price	£516
Good round-trip deal	£536 or less
Good one-way deal	£586 or less

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£325	Average£499	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Air France	Cheapest£385	Average£575	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Lufthansa	Cheapest£395	Average£493	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Finnair	Cheapest£398	Average£545	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
KLM	Cheapest£404	Average£569	FlexibilityNo cancel fee	On-time75%	Search KLM flights
United Airlines	Cheapest£405	Average£642	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
British Airways	Cheapest£430	Average£593	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Virgin Atlantic	Cheapest£443	Average£534	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Delta	Cheapest£444	Average£576	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Air Canada	Cheapest£463	Average£562	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights

Cheap flights from London to Seattle from £377

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 1/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from London to Seattle/Tacoma Intl are usually found in January or March, booked 90 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap flight deals from London to Seattle

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

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 5 September 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 5 September 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

How far ahead should I book a flight from London to Seattle?

Use this chart to determine the optimal time to book a return flight from London to Seattle. Price data was last updated on 29 August 2025.

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

What is the cheapest time of day to fly from LON 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 5 September 2025.

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

Use this chart to determine the cheapest time to fly return from London to Seattle. Price data was last updated on 16 December 2024.

Weekly flight availability from London to Seattle

Explore weekly flight availability from London to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 5 September 2025.

What’s the top stopover airport for flights from London to Seattle?

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

What’s the cheapest stopover airport for flights from London to Seattle?

Average return fare for one-stop flights from London to Seattle, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

What’s the fastest stopover option from London to Seattle?

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

Which airport typically offers the quickest stopover for flights from London to Seattle?

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

Reviews of airlines servicing Seattle

Read reviews from past customers who have flown with KLM, Air France, andVirgin Atlantic from London to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of 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.

What airport do you fly into for flights to Seattle from London?

How long is the flight from London to Seattle?

What are the cheapest airlines flying from London to Seattle round-trip?

What are the most popular routes from London to Seattle?

What are the most reliable airlines from London to Seattle?

What are the cheapest flights from London 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?

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

Travelling to a place near Seattle?

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.

Fly from London to Seattle on these airlines

Choose from the following airlines for your flight from London to Seattle. Flights are based on user searches made on Cheapflights and were last updated on 5 September 2025.

Top 10 airlines flying from London to Seattle

Fly with Cheapflights

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

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?

100% Free

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 5 September 2025.