sea-to-lhr

 

The cheapest times to fly from SEA to LHR are

  • January 8th to March 18th
  • May 7th to June 3rd
  • September 10th to December 9th (except the weeks of October 29th and November 19th)

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from SEA to LHR is mid May. Prices can be as high as $1006 for Saturday flights during mid December, or as low as $433 for Tuesday flights around mid May.

 

When to Fly to London

Flying from Seattle, WA (SEA) to London (LHR) will usually cost between $443 to $756 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid May with an average ticket price of $437. Due to high demand the most expensive time to fly is mid December, with an average price of $842. Planning your trip to low-cost times can easily save you $405 on economy flights and even more on first-class flights. Generally, any price below $494 can be considered a good price for a round-trip SEA to LHR flight.

See below for a graph of average weekly prices for the SEA to LHR route. All prices are for round-trip tickets in USD.

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SEA to LHR Flight Prices

Compared to other flights, the SEA to LHR flight is much cheaper than the average and costs much less than the average flight leaving from Seattle. The average price per mile (for a direct flight) is $0.06, which is far below average.

 

Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Saturdays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $65 (11%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $499. Return trip prices are from the LHR to SEA flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

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Departure Day Prices

Return Trip Prices by Day

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Return Day Prices

 

Nonstop Flights and Layovers

Travelers looking to fly from SEA to LHR can generally find a 0-layover flight. Because there is a direct flight option the real-world direct flight time of 9 hour 36 minutes may be realistic.

 

Flight Questions Answered

Still have questions about flying from SEA to LHR? We’ve got answers.

Which airlines fly this route?

You can find 26 major airlines flying this route most often: Aer Lingus, Aeromexico, Air Canada, Air France, Air New Zealand, Alaska, Alitalia, American, Austrian, British Airways, Brussels Airlines, Condor, Delta, Finnair, Iberia, Icelandair, KLM, LOT, Lufthansa, SAS, Singapore Airlines, SWISS, Tap Air Portugal, Turkish Airlines, United, Virgin Atlantic, and potentially more during busy seasons.

How far away is it from London Heathrow Airport to Seattle/Tacoma International Airport?

The distance between the two airports is roughly 4785 miles or 7701 kilometers.

How long does it take to fly from SEA to LHR?

The real-world flight time for a nonstop SEA to LHR flight is about 9 hour 36 minutes.

How many flights go between Seattle, WA and London?

It depends on the day of the week and the date, but a typical day might have around 69 available flights from SEA to LHR.

 

Airport Location Info

 

Departing Airport

Origination code SEA
Origination airport name Seattle/Tacoma International Airport
City Seattle, WA
Country the United States
Latitude 47.5
Longitude -122.3

Return Airport

Destination code LHR
Destination airport name London Heathrow Airport
City London
Country the United Kingdom
Latitude 51.5
Longitude -0.5

 

Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.