£414 Cheap British Airways flights from Seattle to London (SEA→LHR)

View £414 flight on Mon, 14 Sept 2026Opens in a new window

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British Airways flights from Seattle to London (SEA→LHR)

Prices were available within the past 7 days and start at £414 for one-way flights and £738 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Thu, 3 Sept - Thu, 17 Sept
SEA
Seattle
LHR
London
£738 Return, found 5 hours ago
£738
Return
found 5 hours ago
Select British Airways flight, departing Thu, 3 Sept from Seattle to London, returning Thu, 17 Sept, priced at £738 found 5 hours ago

Alternative airports near London

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Gatwick LGW. Average driving time to city centre is 52 minutes. Flights from £839
LGW
Gatwick
Average driving time to city centre52 min
Flights from £839
Select flight to London City LCY. Closest option available. Average driving time to city centre is 21 minutes. Flights from £852
LCY
London City
Closest
Average driving time to city centre21 min
Flights from £852

Find the cheapest month to fly from Seattle (SEA) to London (LHR)

October is typically the cheapest month to fly

From £363 - £641 per traveller.

Frequently asked questions

How much is a British Airways flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)?
Landing cheap one-way British Airways flights from SEA to LHR from £414 on Expedia is easy — just filter by "Price (lowest to highest)." Alternatively, check out our budget-friendly round-trip fares from £738 for your next exciting getaway.**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.
What is the cheapest month to fly from SEA to LHR with British Airways?
British Airways flights to London tend to be more affordable in the low-season months of January and February. Whether you're after a round-trip or one-way ticket, you could score a better deal then.
Does British Airways fly nonstop from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)?
Yes, you can fly from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR) on any of British Airways's 9 weekly direct flights. Use Expedia's "Nonstop" and "Airline" filters to find the British Airways flight that'll land at LHR at a time that suits you.
How long does it take to fly from SEA to LHR with British Airways?
From takeoff till touchdown, a nonstop British Airways flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR) takes around 9h 25m.
Which day of the week has the most British Airways flights from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)?
British Airways operates the most flights from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR) on Thursday. With up to 2 daily departures, you'll get the most flexibility and choice on this day.
What airports does British Airways fly into in London?
Heathrow Airport (LHR) is the primary London gateway for British Airways flights from Seattle - Tacoma Intl. Airport (SEA).
What kind of luggage can I take on a British Airways flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)?
On a standard economy flight with British Airways from SEA to LHR, passengers can bring 1 checked-in bag up to 23 kg (50 lbs) with dimensions no larger than 89 centimetres x 41 centimetres x 74 centimetres in total. For carry-on, you can have 1 cabin bag weighing up to 23 kg (50 lbs) and measuring less than 56 centimetres x 23 centimetres x 43 centimetres. Weight and size limits can differ based on the airfare type and cabin class you're in. To make sure you don't get caught with additional charges at the terminal, double-check your British Airways booking or look up the airline's website before you begin packing.
What type of plane does British Airways fly from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)?
Take a British Airways flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR), and you'll probably be on a Boeing 787-10. Bear in mind though, that the aircraft type can change due to operational reasons.
Can I change or cancel my British Airways flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)?
You can usually change or cancel your flight, although there may be additional charges if you booked over 24 hours ago. Need flexible options? Make use of Expedia's "No cancel fee" and "Changes included" filters to find flights that won't charge extra if you need to alter your plans. To update your booking, visit "Trips," select your flight and click on "Manage Booking" for more information.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air Canada, Air France, Alaska Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, JetBlue Airways, KLM, Lufthansa, Scandinavian Airlines, Singapore Airlines, Swiss International Air Lines, Turkish Airlines, Virgin Atlantic, WestJet
Popular airline
Aer Lingus
Distance
7657 km
Average flight time
17 hours 35 mins

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