£325 Cheap Flights from London (LHR) to Seattle (SEA)

You can find cheap one-way flights from £325 and cheap return flights £422 LHR to SEA with Expedia. One-way flights typically cost between £421 and £2873, and return flights often range between £574 and £3420. 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 the cheapest fares first, and use the Price Tracking tool to receive alerts when LHR to SEA ticket fares go up or down.

The cheapest months to fly from LHR to SEA 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 LHR to SEA and your travel dates, then apply the 'Nonstop' filter to see only direct flights.

To find a cheap flight from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.), 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.

The best airline to fly with from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) will differ from traveller to traveller. If you like to fly early, British Airways offers early morning flights. If price is the most important factor, Alaska Airlines typically offers the lowest fares. British Airways offers the most daily flights from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.), which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.

The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.

You'll find approximately 4 nonstop flights per day from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.). For even more choices, look at flights that include layovers; there are around 192 connecting flights per day. Some common connection points include Dublin (DUB), Schiphol (AMS), and John F. Kennedy Intl. (JFK).

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

You'll typically find the most flights from London Heathrow (LHR) to Seattle - Tacoma Intl. (SEA) on a Monday, with around 111 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include British Airways, United, and American Airlines. Flight options are notably more abundant on Mondays compared to other days of the week, offering you greater flexibility.

The most popular departure times for flights from London Heathrow (LHR) to Seattle - Tacoma Intl. (SEA) are between 9am and 12pm. Many major carriers, including British Airways, Virgin Atlantic and United, offer flights during this window. Many travellers prefer these times as they allow for a morning departure, giving you a full day to settle in once you arrive in Seattle.

Flying nonstop from LHR to SEA takes around 10 hours, with the route covering approximately 7,704 kilometers. Flights with a layover typically take 6 hours 50 minutes longer than direct options. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.

You can fly business class or first class between LHR and SEA. Airlines that offer business class service on this route include:

• Lufthansa
• Air France
• Icelandair
• ITA Airways
• SAS
• Air Baltic
• Swiss International Air Lines
• British Airways
• Turkish Airlines
• KLM
• Singapore Airlines
• Delta
• Air Canada
• Med View Airlines
• American Airlines
• Alaska Airlines
• United
• Finnair
• Virgin Atlantic

First class cabins are available on British Airways and American Airlines.

A direct, return business class ticket from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) typically costs between £5,170 - £12,570. A non-stop, one-way business class flight is usually around £9,048 - £10,118. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) if you opt for a connecting flight.

It's easy to earn miles on a London (LHR) to Seattle, WA (SEA) 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 London (LHR) to Seattle, WA (SEA) 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 London (LHR) to Seattle, WA (SEA) 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 London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) 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.