£133 Cheap Flights from Seattle (SEA) to London (LHR)

You can find one-way and return flights from Seattle, WA (SEA) to London (LHR) with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when SEA to LHR ticket fares go up or down.

The cheapest months to fly from Seattle, WA (SEA) to London (LHR) are typically during off-peak season when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you are able to. Use the calendar view in your search to see which months have low fares on this route.

Enter SEA to LHR and your travel dates, then apply the 'Nonstop' filter to see only direct flights.

To find a cheap flight from Seattle, WA (SEA) to London (LHR), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.

When looking for the best time to fly from Seattle-Tacoma International Airport (SEA) to London Heathrow (LHR), it's all about balancing good prices with plenty of flight options. You'll find the cheapest flights in October and November, with average return prices around £479. While May is a popular month with lots of flight availability, it might not offer the lowest fares. If you're flexible, aiming for October or November could give you a great deal, and you'll still find good flight schedules to get you to London.

Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from Seattle, WA (SEA) to London (LHR). To compare more early flights, use the "Early Morning" and "Morning" filters in your search.

A nonstop flight from SEA to LHR typically takes around 9 hours 30 minutes, covering approximately 7,704 kilometers. Connecting flights on this route usually add 5 hours 30 minutes to your travel time. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.

Select the "Business class" and "First class" filters when looking for Seattle, WA (SEA) to London (LHR) flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.

It's easy to earn miles on a Seattle, WA (SEA) to London (LHR) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.

*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.

Typically, booking a last minute flight from Seattle, WA (SEA) to London (LHR) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.

Securing a Seattle, WA (SEA) to London (LHR) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.

If you booked your Seattle, WA (SEA) to London (LHR) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.