$418 Cheap British Airways flights Seattle (SEA) to London (LHR)

Make use of the “Price (lowest to highest)” filter on Expedia to look for cheap British Airways round-trip flights from $584 from SEA to LHR. Affordable one-way options from $418 are also on offer.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

January is one of the cheapest months to jet away to London with British Airways. You could also find great prices on one-way and return fares in February.

To get affordable flights from SEA to LHR with British Airways, start searching about one month before your planned departure. You can save 17% when you lock in your international tickets 18 to 29 days ahead instead of booking four to five months in advance. Another tip? Booking on Sunday offers average savings of 17% compared to Friday (the most expensive day).**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

British Airways operates direct flights from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR), with 9 weekly departures. Simply use the “Nonstop” and “Airline” filters during your search on Expedia to see all direct British Airways flights to LHR.

The travel time for a nonstop British Airways flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR) typically takes 9h 25m.

Thursday has the most British Airways flights from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR). With 2 daily departures, this is a great day to find something that will suit your schedule.

The first flight from SEA to LHR with British Airways leaves at 1:35PM UTC-8. You’ll touch down at 7:00AM UTC+0. The final British Airways flight of the day takes off at 6:50PM UTC-8 and arrives at 12:15PM UTC+0. With around 20% fewer cancellations for morning and mid-morning departures, starting your travel day early is usually the best option.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

British Airways flights from Seattle - Tacoma Intl. Airport (SEA) to London come in to land at Heathrow Airport (LHR). This is the main entry point to this city.

On a standard economy flight with British Airways from SEA to LHR, passengers can bring 1 checked-in bag up to 50 lb with dimensions no larger than 29 inches x 15 inches x 16 inches in total. For hand luggage, you’re allowed 2 cabin bags weighing up to 50 lb and measuring less than 19 inches x 9 inches x 17 inches. Size and weight limits may vary based on your airfare type and cabin class. To make sure you don’t get caught with extra charges at the airport, check your British Airways booking or visit the airline’s website before packing your bags.

Traveling from SEA to LHR with British Airways comes with a range of perks, such as a 4-star airline rating and an excellent in-flight experience. Plus, when booking through Expedia, One Key™ members can collect OneKeyCash™* to spend on select future travel purchases. That’s on top of the British Airways Executive Club points you can earn with British Airways.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Catch a British Airways flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR), and you’ll likely be seated on a Boeing 787-10. Bear in mind though, that the aircraft type can change depending on operational reasons.

Changes are typically free within 24 hours of booking, but your airline may add a charge after that time. For more details about altering your reservation, head to your “Trips,” select your flight and click on “Manage Booking.” If you want the flexibility to update your itinerary without additional costs, check the “No cancel fee” or “Changes included” filter when planning your next adventure.