British Airways flights from London Heathrow Airport to Seattle (LHR - SEA)

LHR — SEA
19 Jun — 26 Jun1
1 adult
1 adult, Economy, 0 bags

Cheapflights users flying from London to Seattle on British Airways typically fly into Seattle/Tacoma Intl and depart from London Heathrow. Select your dates above for pricing.

British Airways flights from Heathrow to Seattle in 2026

Find detailed information about British Airways flights from Heathrow to Seattle. Explore the options provided by British Airways to plan your journey from Heathrow to Seattle. Data last updated 20 May 2026.

One-way from

£418

Return from

£534

Popular in

July

Cheapest in

February

Average price (all airlines)

£620
British Airways
  • British Airways
  • 13/9
  • 2 total stops
  • 27h 20m total
  • London to Seattle
British Airways
  • British Airways
  • 1/7-13/7
  • Nonstop
  • 19h 00m total
  • London to Seattle
Highest demand for flights from London Heathrow to Seattle/Tacoma Intl; 10% potential price increase.
Best time to find cheap flights from London Heathrow to Seattle/Tacoma Intl; 2% potential price drop.
Average price for all London Heathrow to Seattle/Tacoma Intl flights (one-way and round-trip).
  • How do most travelers feel about British Airways?

    The general consensus from 7,989 Cheapflights users is that British Airways is a 6.7/10. Select your travel dates above for updated prices on flights from London Heathrow Airport to Seattle (LHR-SEA).

  • Can I get a flight from London Heathrow Airport to Seattle on British Airways for under £671?

    London Heathrow Airport to Seattle flights on British Airways are currently available under £671. 7 flights have been found by Cheapflights users under that amount. To find flights for your dates, click here.

Find British Airways flight deals from Heathrow to Seattle

Enter your travel dates to find the best prices.

Cheapest British Airways flights from Heathrow to Seattle
Explore the most affordable British Airways flight options available from Heathrow to Seattle. Find the lowest fares with prices last updated on 20 May 2026.

Thu 11/616:30
LHR
-
SEA
Nonstop9h 55m
British Airways
Thu 25/613:30
SEA
-
LHR
Nonstop9h 15m
British Airways
Deal found 15/5£537
Sun 7/609:50
LHR
-
SEA
Nonstop9h 45m
British Airways
Thu 25/613:30
SEA
-
LHR
Nonstop9h 15m
British Airways
Deal found 15/5£547
Tue 9/609:50
LHR
-
SEA
Nonstop9h 45m
British Airways
Wed 24/613:30
SEA
-
LHR
Nonstop9h 15m
British Airways
Deal found 15/5£548

When is the best time to book a flight to Seattle with British Airways?

The best time to book a flight to Seattle with British Airways is 82 days before departure. On average, fares are higher if you book 34 days before departure.

Which month is the cheapest to fly Economy class from London Heathrow Airport to Seattle?

For Economy class flights, the cheapest month to fly this route is September. The most expensive months are January and December.

Best time to book a flight from Heathrow to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Heathrow with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

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Fly from Heathrow to Seattle on another airline

Consider alternative airlines that service the Seattle area. Flight routes are based on user searches made on Cheapflights and were last updated on 20 May 2026.

See what others are saying about British Airways

Read reviews and see what other travellers are saying about their experiences with British Airways. Get insights from real passengers regarding the airline's services, customer satisfaction, and overall travel experience. Use these reviews to inform your decision when choosing British Airways for your next flight. Reviews last updated 20 May 2026.
British Airways
6.7
Okay
7,986 reviews
Overview

Entertainment

6.4

Boarding

6.9

Comfort

6.8

Crew

7.7

Food

6.4

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