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LHR - SEA

C$ 724 Find cheap flights from London to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from London to Seattle departing on 20/6. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Wed 5/6
Wed 12/6

Search hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Seattle, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Seattle, as well as popular online travel agencies
In the last 7 days, travellers have searched 42,573,820 times on KAYAK, and here is why:

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Cheap flight deals from London to Seattle (LHR-SEA)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from London to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
12:15 p.m. - 8:14 p.m.LHR-SEA
15h 59m1 stop
2:13 p.m. - 11:45 a.m.SEA-LHR
13h 32m1 stop
C$ 853
Find Deal
Tue, 17 Sep - Tue, 24 Sep
12:45 p.m. - 2:40 p.m.LHR-SEA
9h 55mdirect
12:30 a.m. - 7:15 a.m.SEA-LHR
22h 45m1 stop
C$ 863Delta
Find Deal
Mon, 16 Sep - Mon, 23 Sep
6:30 a.m. - 2:30 p.m.LHR-SEA
16h 00m2 stops
1:30 p.m. - 11:45 a.m.SEA-LHR
14h 15m1 stop
C$ 870Lufthansa
Find Deal
Thu, 19 Sep - Tue, 8 Oct
1:05 p.m. - 5:55 p.m.LHR-SEA
12h 50m1 stop
6:55 p.m. - 8:20 p.m.SEA-LHR
17h 25m1 stop
C$ 898Icelandair
Find Deal
Tue, 10 Sep - Thu, 19 Sep
4:40 p.m. - 8:08 p.m.LHR-SEA
35h 28m1 stop
8:05 a.m. - 10:40 a.m.SEA-LHR
18h 35m1 stop
C$ 910Austrian Airlines
Find Deal
Mon, 30 Sep - Wed, 9 Oct
4:50 p.m. - 7:20 p.m.LHR-SEA
10h 30mdirect
1:35 p.m. - 10:00 a.m.SEA-LHR
12h 25m1 stop
C$ 935KLM
Find Deal
Mon, 9 Sep - Wed, 18 Sep
1:05 p.m. - 8:35 p.m.LHR-SEA
15h 30m1 stop
11:00 p.m. - 8:20 p.m.SEA-LHR
13h 20m1 stop
C$ 940Icelandair
Find Deal
Fri, 31 May - Tue, 11 Jun
6:30 a.m. - 12:25 p.m.LHR-SEA
13h 55m1 stop
7:00 a.m. - 5:55 a.m.SEA-LHR
14h 55m1 stop
C$ 947Lufthansa
Find Deal
Wed, 29 May - Tue, 11 Jun
4:40 p.m. - 8:14 p.m.LHR-SEA
35h 34m1 stop
8:10 a.m. - 6:45 a.m.SEA-LHR
14h 35m1 stop
C$ 966Austrian Airlines
Find Deal
Tue, 3 Sep - Tue, 10 Sep
4:50 p.m. - 7:20 p.m.LHR-SEA
10h 30mdirect
9:15 p.m. - 2:50 p.m.SEA-LHR
9h 35mdirect
C$ 1,002KLM
Find Deal
Sat, 14 Sep - Sat, 28 Sep

Flights from London to Seattle - Travel Insights & Trends

Get data-powered insights and trends into flights from London to Seattle to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from London to Seattle?

The average price of all flights from London Heathrow Airport to Seattle clicked on KAYAK for each day over the last 12 months.
If you are looking for a flight deal from London to Seattle, look for departures on Tuesdays and avoid leaving on a Monday, as it's usually the priciest day. When flying back from Seattle, Tuesday is the cheapest day to fly and Wednesday is the most expensive.

What is the cheapest month to fly from London Heathrow Airport to Seattle?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from London Heathrow Airport to Seattle, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from London Heathrow Airport to Seattle is November, where tickets cost C$ 776 on average. On the other hand, the most expensive months are July and August, where the average cost of tickets is C$ 1,241 and C$ 1,171 respectively.

How far in advance should I book a flight from London Heathrow Airport to Seattle?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from London Heathrow Airport to Seattle, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from London Heathrow Airport to Seattle, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 43 days before departure.

Which airlines provide the cheapest flights from London to Seattle?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
The best deals for a one-way ticket found by KAYAK users over the last 3 days were on WestJet (C$ 724) and JetBlue (C$ 1,080). The cheapest round-trip tickets were found on Delta (C$ 863) and Lufthansa (C$ 870).

Which airlines fly most frequently between London and Seattle?

British Airways connects London to Seattle with up to 2 flights per day. Delta also offers 2 flights per day, while Virgin Atlantic follows with 1 flight per day.

How many flights are there between London Heathrow Airport and Seattle per day?

Each day, there are between 5 and 7 nonstop flights that take off from London Heathrow Airport and land in Seattle, with an average flight time of 10h 02m. The most common departure time is 4:00 p.m. and most flights take off in the afternoon. Each week, there are 41 flights. The most frequent day of departure is Saturday, when 17% of all weekly flights depart. The fewest flights depart on a Monday.

Which cabin class options are there for flights between London Heathrow Airport and Seattle?

The average price of flights for each cabin class for the route found by users searching on KAYAK over the last 2 weeks.
There is only one cabin class option available for the route, which is Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

How long does a flight from London to Seattle take?

The duration of a direct flight to Seattle from London is typically 9h 45m. The journey crosses a distance of 12,387 km.

What’s the earliest departure time from London to Seattle?

Early birds can take the earliest flight from London Heathrow Airport at 9:45 am and will be landing in Seattle at 11:30 am.

What’s the latest departure time from London to Seattle?

If you prefer to fly at night, the latest flight from London Heathrow Airport to Seattle jets off at 4:50 pm and lands at 7:10 pm.

Good to know

Low season

January

High season

August

Cheapest flight

C$ 724
Best time to beat the crowds (11% less expensive on average)
Most popular time to fly (20% more expensive on average)
Flight from London to Seattle

When to book flights from London to Seattle

Are your dates flexible? Find out the best times to travel from London to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking London to Seattle flights

  • Are there hotels near Seattle Airport?

    Several hotels are located near Seattle Airport. The Wingate by Wyndham hotel has a free airport shuttle, fitness centre and free Wi-Fi. The Aloft Seattle Sea-Tac hotel is just down the street from the airport, offers laundry and dry cleaning services and is pet friendly. Another pet-friendly hotel is the Residence Inn which also offers free breakfast and an airport shuttle. The Residence Inn and the Element Hotel are two options that include kitchenettes and microwaves in their rooms.

  • How can I get to Heathrow Airport from central London?

    There is an express train that runs from London Paddington Station to Heathrow Airport around every 15min. The trip takes roughly 15min and tickets cost about £25.00. Children under 15 can travel for free as long as they are travelling with a fare-paying adult or have proof of their flight booking.

  • What's the best way to reach downtown Seattle from the airport?

    The 1 Line Light Rail service runs from the airport to downtown Seattle. The trip takes around 41min. The line also stops at the University of Washington. You can reach the Light Rail Station by heading across the 'Skybridge' from baggage claim. B uses from Seattle Airport depart from near the Light Rail Station. The Rapid Ride A-Line and Route 156 buses both travel to downtown Seattle. Your hotel may also offer a courtesy shuttle from the airport. These shuttles will stop at the courtesy island shuttle lane on the third floor of the car park.

  • Are there hotels at Heathrow Airport?

    There are three hotels connected to Heathrow Airport. The Sofitel Hotel is connected to Terminal 5 and offers a complimentary breakfast. If you're departing from Terminal 4, you might prefer to stay at The Hilton which has a fitness centre and restaurant on-site. The Aerotel hotel is connected to Terminal 3 and is within walking distance of Terminal 2. Aerotel offers hourly booking with a minimum stay of one hour.

  • What is the cheapest flight from London Heathrow Airport to Seattle?

    In the last 3 days, the lowest price for a flight from London Heathrow Airport to Seattle was C$ 529 for a one-way ticket and C$ 623 for a round-trip.

  • Which airlines offer Wi-Fi service onboard planes from London to Seattle?

    KLM, Delta, Air France, and Virgin Atlantic offer inflight Wi-Fi service on the London to Seattle flight route.

  • Which aircraft models fly most regularly from London to Seattle?

    The Boeing 787-9 Dreamliner is the aircraft model that flies most regularly on the London to Seattle flight route.

  • Which airline alliances offer flights from London to Seattle?

    oneworld, SkyTeam, and Star Alliance are the airline alliances operating flights between London and Seattle, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from London to Seattle?

    There are direct flights from London to Seattle on a daily basis.

  • How does KAYAK find such low prices on flights from London to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from London to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from London is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from London to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to London with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from London up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding a cheap flight from London to Seattle

  • Looking for a cheap flight? 25% of our users found flights on this route for C$ 1,057 or less round-trip.
  • Travelling with children at London Heathrow Airport (LHR)? Kids aged nine and under can visit Stay & Play areas available in each terminal. Open between 6:00 and 21:00, these are soft play areas that also offer colouring-in and activity sheets.
  • Seattle Tacoma Airport (SEA) has the FlySEA app which provides information and live updates on ground transport including public transport, taxis and courtesy shuttles. It also provides up-to-date information on flights, so anyone picking you up from the airport can check to see if your flight is delayed.
  • Heathrow Airport has partnered with the 'Grab' app to let you pre-order food and drink from your phone and collect it from one of the dedicated checkpoints in the terminal.
  • Heathrow Airport has multi-faith prayer rooms in each terminal, after security. You can also visit St. George's Chapel, located just outside the airport.
  • If you've organised for someone to pick you up from Seattle Airport, they can park in the Cell Phone Car Park for free for up to 20min. Let them know when you're ready to leave and they will be able to pick you up from outside Baggage Claim.
See more tips

Prefer to fly non-stop from London to Seattle?

Find which airlines fly direct from Heathrow to Seattle/Tacoma Intl, which days they fly and book direct flights.

Nonstop departures

London Heathrow to Seattle/Tacoma Intl

Monday

Aer Lingus, Aeromexico, Air France, +8 more

Aer Lingus, Aeromexico, +9 more

Tuesday

Aer Lingus, Aeromexico, Air France, +8 more

Aer Lingus, Aeromexico, +9 more

Wednesday

Aer Lingus, Aeromexico, Air France, +8 more

Aer Lingus, Aeromexico, +9 more

Thursday

Aer Lingus, Aeromexico, Air France, +8 more

Aer Lingus, Aeromexico, +9 more

Friday

Aer Lingus, Aeromexico, Air France, +8 more

Aer Lingus, Aeromexico, +9 more

Saturday

Aer Lingus, Aeromexico, Air France, +8 more

Aer Lingus, Aeromexico, +9 more

Sunday

Aer Lingus, Aeromexico, Air France, +8 more

Aer Lingus, Aeromexico, +9 more

See more nonstop flights

Nonstop returns

Seattle/Tacoma Intl to London Heathrow

Monday

Aer Lingus, Aeromexico, Air France, +8 more

Aer Lingus, Aeromexico, +9 more

Tuesday

Aer Lingus, Aeromexico, Air France, +8 more

Aer Lingus, Aeromexico, +9 more

Wednesday

Aer Lingus, Aeromexico, Air France, +8 more

Aer Lingus, Aeromexico, +9 more

Thursday

Aer Lingus, Aeromexico, Air France, +8 more

Aer Lingus, Aeromexico, +9 more

Friday

Aer Lingus, Aeromexico, Air France, +8 more

Aer Lingus, Aeromexico, +9 more

Saturday

Aer Lingus, Aeromexico, Air France, +8 more

Aer Lingus, Aeromexico, +9 more

Sunday

Aer Lingus, Aeromexico, Air France, +8 more

Aer Lingus, Aeromexico, +9 more

See more nonstop flights
See more nonstop flights

Book cheap flights from London to Seattle

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from London to Seattle found on KAYAK in the last 72 hours.
20/6Thu
1 stopWestJet
14h 11mLHR-SEA
C$ 724
20/6Thu
2 stopsWestJet
49h 20mLHR-SEA
C$ 753
17/5Fri
2 stopsWestJet
34h 25mLHR-SEA
C$ 796
22/5Wed
1 stopJetBlue
19h 05mLHR-SEA
C$ 1,080
2/7Tue
1 stopJetBlue
18h 55mLHR-SEA
C$ 1,084
20/5Mon
2 stops
21h 04mLHR-SEA
C$ 1,208
6/7Sat
1 stopTurkish Airlines
18h 10mLHR-SEA
C$ 1,460
15/7Mon
2 stopsTAP AIR PORTUGAL
28h 28mLHR-SEA
C$ 1,502
18/9Wed
2 stops
17h 36mLHR-SEA
C$ 1,533
25/9Wed
3 stopsTAP AIR PORTUGAL
42h 58mLHR-SEA
C$ 1,657

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Last minute flights from London to Seattle

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from London to Seattle that are departing in the next 10 days.
10/5Fri
multi-stopIcelandair
12h 35mLHR-SEA
27/5Mon
multi-stopIcelandair
12h 05mSEA-LHR
C$ 1,114
10/5Fri
multi-stopKLM
12h 55mLHR-SEA
13/5Mon
directKLM
9h 40mSEA-LHR
C$ 1,154
10/5Fri
multi-stop
20h 17mLHR-SEA
21/5Tue
multi-stop
22h 35mSEA-LHR
C$ 1,184
10/5Fri
multi-stopVirgin Atlantic
18h 15mLHR-SEA
13/5Mon
directVirgin Atlantic
9h 40mSEA-LHR
C$ 1,186
10/5Fri
multi-stopIcelandair
12h 35mLHR-SEA
22/5Wed
multi-stopIcelandair
13h 20mSEA-LHR
C$ 1,196
10/5Fri
directVirgin Atlantic
10h 30mLHR-SEA
13/5Mon
directVirgin Atlantic
9h 40mSEA-LHR
C$ 1,203
11/5Sat
multi-stopUnited Airlines
31h 47mLHR-SEA
21/5Tue
multi-stopUnited Airlines
14h 40mSEA-LHR
C$ 1,244
11/5Sat
directDelta
9h 55mLHR-SEA
12/9Thu
multi-stopDelta
17h 10mSEA-LHR
C$ 1,281
7/5Tue
multi-stopDelta
18h 10mLHR-SEA
19/5Sun
multi-stopDelta
22h 35mSEA-LHR
C$ 1,378
9/5Thu
multi-stopUnited Airlines
17h 38mLHR-SEA
26/5Sun
multi-stopUnited Airlines
35h 13mSEA-LHR
C$ 2,879

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London - Seattle Flights

Departure:

London (LHR)United Kingdom

Destination:

Seattle (SEA)United States

Return flight deals:

Seattle - London

Cabin classes:

C$ 6,986
C$ 2,291
C$ 910

Browse origins:

  • Flights » 
  • London Heathrow Airport

Browse destinations:

  • Flights » 
  • Worldwide » 
  • Seattle