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Cheap flights from London to Seattle

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Find the cheapest flights from London to Seattle

Cheap return flights

KAYAK's recommended return flight deals from the most popular airlines that fly from London to Seattle.
LHR-SEA
9h 45mdirect
SEA-LHR
9h 20mdirect
American Airlines
Find Deal
LHR-SEA
10h 20mdirect
SEA-LHR
9h 45mdirect
LHR-SEA
9h 45mdirect
SEA-LHR
9h 20mdirect
Alaska Airlines
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LHR-SEA
9h 45mdirect
SEA-LHR
9h 20mdirect
Aer Lingus
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LHR-SEA
10h 20mdirect
SEA-LHR
9h 45mdirect
Air France
Find Deal
LHR-SEA
9h 45mdirect
SEA-LHR
9h 20mdirect
Finnair
Find Deal
LHR-SEA
10h 20mdirect
SEA-LHR
9h 45mdirect
LHR-SEA
9h 45mdirect
SEA-LHR
9h 20mdirect
Iberia
Find Deal
LHR-SEA
10h 20mdirect
SEA-LHR
9h 45mdirect
Aeromexico
Find Deal
LHR-SEA
10h 20mdirect
SEA-LHR
9h 45mdirect
Virgin Atlantic
Find Deal
LHR-SEA
9h 45mdirect
SEA-LHR
9h 20mdirect
British Airways
Find Deal

See travel insights to Seattle from

How to get the cheapest flight ticket from London 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 cheapest month to fly to Seattle from London is in January. Flight prices, which tend to average around R11 577, are often lower during this time because this is during the off-season. If you aren’t able to travel to Seattle during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of R12 089.

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

Fly from London Heathrow to Seattle/Tacoma Intl for the best London - 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 when booking 24 weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around R14 363 when searching 24 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from London for as low as R13 388 on momondo.

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

There are 1 cabin classes available to choose from on London 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.

How have London to Seattle flight prices changed over time?

As of March 2025, prices for London to Seattle flights are approximately 7% more expensive when compared to flights at the same time last year.

When to book flights from London to Seattle

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

Cheap London to Seattle (LON to SEA) flight deals and tips

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

Direct flights

None
There are no direct flights from London to Seattle. There are no popular flight routes from London to Seattle.

  • How far is London to Seattle/Tacoma Intl by plane?

    A flight from London to Seattle/Tacoma Intl will travel around 7694,7 km.

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

    Prices for flights from London to Seattle/Tacoma Intl Airport were last updated today.

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

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

    The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's licence and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

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


Travelling to a place near Seattle?

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

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from London to Seattle . Millions of users trust and use momondo every year so you are in good hands.

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?

Once all potential London to Seattle flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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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