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Cheap flights from London Heathrow Airport to Seattle

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Find the cheapest flights from London Heathrow Airport to Seattle

Cheap return flights

American Airlines Logo
LHR-SEA
9h 45mdirect
American Airlines Logo
SEA-LHR
9h 20mdirect
American Airlines
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KLM Logo
LHR-SEA
10h 40mdirect
KLM Logo
SEA-LHR
9h 40mdirect
KLM
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Alaska Airlines Logo
LHR-SEA
9h 55mdirect
Alaska Airlines Logo
SEA-LHR
9h 20mdirect
Alaska Airlines
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Aer Lingus Logo
LHR-SEA
9h 55mdirect
Aer Lingus Logo
SEA-LHR
9h 20mdirect
Aer Lingus
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Air France Logo
LHR-SEA
10h 40mdirect
Air France Logo
SEA-LHR
9h 40mdirect
Air France
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Finnair Logo
LHR-SEA
10h 05mdirect
Finnair Logo
SEA-LHR
9h 35mdirect
Finnair
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Delta Logo
LHR-SEA
10h 40mdirect
Delta Logo
SEA-LHR
9h 40mdirect
Delta
Find Deal
Scandinavian Airlines Logo
LHR-SEA
10h 40mdirect
Scandinavian Airlines Logo
SEA-LHR
9h 40mdirect
Scandinavian Airlines
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Iberia Logo
LHR-SEA
10h 05mdirect
Iberia Logo
SEA-LHR
9h 35mdirect
Iberia
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Aeromexico Logo
LHR-SEA
10h 05mdirect
Aeromexico Logo
SEA-LHR
9h 45mdirect
Aeromexico
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Virgin Atlantic Logo
LHR-SEA
10h 40mdirect
Virgin Atlantic Logo
SEA-LHR
9h 40mdirect
Virgin Atlantic
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British Airways Logo
LHR-SEA
10h 05mdirect
British Airways Logo
SEA-LHR
9h 35mdirect
British Airways
Find Deal

See travel insights to Seattle from

How to get the cheapest flight ticket from London Heathrow Airport to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Seattle?

The month of February is, on average, the cheapest month to fly to Seattle from London Heathrow Airport, with most prices found around $986. If you are unable to visit Seattle during the month of February, then departing from London Heathrow Airport during the month November is also very affordable. Most momondo users find prices during this month for around $1,049.

What is the cheapest London Heathrow to Seattle/Tacoma Intl flight route?

Fly from London Heathrow to Seattle/Tacoma Intl for the best London Heathrow - Seattle/Tacoma Intl flight prices

How far in advance should I book a flight to Seattle?

You are more likely to see cheaper flights to Seattle from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $1,183 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from London Heathrow Airport for as low as $1,078 on momondo.

What cabin class options are available on London Heathrow to Seattle/Tacoma Intl flights?

There are 2 cabin classes available to choose from on London Heathrow to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London Heathrow Airport to Seattle flights?

You could potentially save up to 65% on your flight if you consider stops on a London Heathrow Airport to Seattle flight.

How have London Heathrow Airport to Seattle flight prices changed over time?

As of July 2025, prices for London Heathrow Airport to Seattle flights are approximately 2% more expensive when compared to flights at the same time last year.

When to book flights from London Heathrow Airport to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from London Heathrow Airport to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap London Heathrow Airport to Seattle (LHR to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to Seattle

Direct flights

None
There are no direct flights from London Heathrow Airport to Seattle. There are no popular flight routes from London Heathrow Airport to Seattle.
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  • How far is London Heathrow to Seattle/Tacoma Intl by plane?

    Seattle/Tacoma Intl is 7683.2 km away from London Heathrow.

  • When did momondo last update prices for flights from London Heathrow Airport to Seattle/Tacoma Intl Airport?

    Prices for flights from London Heathrow Airport to Seattle/Tacoma Intl Airport are refreshed on a daily basis.

  • How old do you have to be to fly from London Heathrow Airport to Seattle/Tacoma Intl Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London Heathrow Airport to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's licence and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from London Heathrow Airport to Seattle?

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
SeaTac

Why use momondo?

Why should I use momondo to find a flight deal from London to Seattle?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Seattle for you.

Can I find flights from London to Seattle with flexible booking policies on momondo?

Flights from London to Seattle with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from London to Seattle?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from London to Seattle.

I’m not ready to book a flight from London to Seattle right now. Can momondo alert me if prices change?

Yes. momondo can track prices for London to Seattle flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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