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Cheap Flights from Seattle to London

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Compare Seattle to London flight deals

Find the cheapest month or even day of the year to fly to London

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Flight deals from Seattle to London

Looking for a cheap last-minute deal or the best return flight from Seattle to London? Find the lowest prices on one-way and return tickets right here.
London.R 3,805 per passenger.Departing Tue, 21 Oct.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Tue, 21 Oct, arriving in London Heathrow.Price includes taxes and charges.From R 3,805, select.
London.R 4,034 per passenger.Departing Sun, 3 Aug.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Sun, 3 Aug, arriving in London Heathrow.Price includes taxes and charges.From R 4,034, select.
London.R 4,041 per passenger.Departing Thu, 24 Jul.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Thu, 24 Jul, arriving in London Gatwick.Price includes taxes and charges.From R 4,041, select.
London.R 4,063 per passenger.Departing Mon, 8 Sep.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Mon, 8 Sep, arriving in London Gatwick.Price includes taxes and charges.From R 4,063, select.
London.R 5,136 per passenger.Departing Sun, 18 May.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Sun, 18 May, arriving in London Heathrow.Price includes taxes and charges.From R 5,136, select.
London.R 5,574 per passenger.Departing Mon, 30 Jun.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Mon, 30 Jun, arriving in London Luton.Price includes taxes and charges.From R 5,574, select.
London.R 5,750 per passenger.Departing Wed, 12 Nov.One-way flight with Hawaiian Airlines.Outbound indirect flight with Hawaiian Airlines, departs from Seattle / Tacoma International on Wed, 12 Nov, arriving in London Gatwick.Price includes taxes and charges.From R 5,750, select.
London.R 6,771 per passenger.Departing Mon, 1 Dec.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from Seattle / Tacoma International on Mon, 1 Dec, arriving in London Gatwick.Price includes taxes and charges.From R 6,771, select.

Find the cheapest month to fly from Seattle to London

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Seattle to London flights are currently cheapest in October.
May
from R 5,136
Jun
from R 5,574
Jul
from R 4,041
Aug
from R 4,034
Sep
from R 4,063
Oct
from R 3,805
Nov
from R 5,750
Dec
from R 6,771
Jan
from R 7,244
Feb
from R 7,302
Mar
from R 7,254
Apr
from R 7,242

Direct flights from Seattle to London

Alternative Seattle to London routes

Looking for the cheapest, fastest or easiest route from Seattle to London? You could fly into the following airports instead.

Seattle to London: Flight information

The things to know before you go.
Cheapest flight foundR 3,805
Cheapest month to flyOctober
Average flight time9 hrs, 30 mins
Most popular airlineKLM
Average flights per week144

Finding cheap flights from Seattle to London: Frequently asked questions

There are 6 airports in London: London City, London Heathrow, London Gatwick, London Luton, London Stansted, and London Southend.
The best price we found for a return flight from Seattle to London is R 9,662. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
9 hours and 30 minutes is the average flight time from Seattle to London.
KLM, Virgin Atlantic and Delta fly direct from Seattle to London.
As of May 2025, there are 144 flights per week flying from Seattle to London.
The cheapest month to fly from Seattle to London is usually May 2025.
If you're flying from Seattle, the cheapest airport near London is London Heathrow – which is 22.9 km away from the centre of London. We've found flights into this airport from R 9,662.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle to London on Wednesday, 6 August 2025.
Yes – the average flight time is 9 hours and 30 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to London but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to London is around 40 days in advance, so don’t leave your flight to the last minute.
In May, the average temperature is usually around 12°C. August is typically the warmest month in London, when it usually averages around 22°C. You can expect the least rain in March. The coldest month is January, with temperatures averaging 1°C. The rainiest month is October.
The cheapest airline that flies to London is Aer Lingus. And the cheapest airline that flies to London Heathrow Airport is British Airways.

Flying from Seattle to London: what you need to know

  • There are a couple of main airports you can fly out of in Seattle. Check out your options leaving from Seattle-Tacoma International Airport (SEA) or Lake Union Sea Plane Base Airport (LKE) when booking your flight from Seattle to London.

  • Jet into London Heathrow Airport (LHR) or London Gatwick Airport (LGW). You can also reach London through Stansted Airport (STN), London Luton Airport (LTN) and London City Airport (LCY).

  • Take a direct Seattle to London flight and you'll be travelling for an average of 9 hours 35 minutes.

  • London is seven hours ahead of Seattle and observes the UTC+0 timezone.

  • With 26 weekly flights between the two airports, Seattle-Tacoma International Airport (SEA) to London Heathrow Airport (LHR) is the most popular route. Board the earliest flight from Seattle to London with British Airways at 13:30. If you prefer to make the most of your day before you fly, the last departure from SEA to LHR is with Delta Air Lines at 21:20.

  • To ensure you catch your Seattle to London flight, allow plenty of time to navigate the airport and find your gate. Arriving two hours ahead of international departures and an hour before domestic flights is the general rule to follow.

  • If you're getting away during a popular month like July, be at the airport even earlier. It's wise to arrive up to four hours before international flights and two hours ahead of a domestic departure. Security lines will be longer during peak periods like Thanksgiving, Christmas and New Year.

How to find the cheapest flights from Seattle to London

  • Score cheap Seattle to London flights by booking eight months ahead. According to our research, that's the ideal time frame for bagging a bargain.

  • Organise your trip for November. That's the best month for landing cheap plane tickets from Seattle to London. If your travel dates are flexible, use the 'Whole month' tool to see the lowest price across each month.

  • Spend less time searching for cheap flights from Seattle to London by setting up a Price Alert. We'll send you an email or notification through the app when a new discounted fare appears.

  • Tailor your trip using filters. Select your preferred departure and arrival times, airlines and total journey duration. You can also sort your results by 'Fastest,' 'Cheapest' or 'Best' Seattle to London flights.

Flying from Seattle

Seattle-Tacoma International Airport (SEA)

  • You can catch a direct flight from Seattle to London leaving from Seattle-Tacoma International Airport (SEA). Start your journey at SEA and come in for landing at London Heathrow Airport (LHR).

  • Top airlines that offer direct Seattle to London plane tickets from SEA include:

  • Think about adding a stopover to potentially save on your Seattle to London flight. Simply deselect 'Direct flights only' when browsing departures from Seattle-Tacoma International Airport. Break up your trip (and maybe save some cash) by stopping at one of these popular airports:

    • Amsterdam Airport Schiphol (AMS)

    • Frankfurt Airport (FRA)

    • Dublin Airport (DUB)

  • SEA is about 18 kilometres from central Seattle. If you're driving, catching a cab or ride-sharing from the centre, it'll take you 20 minutes or so to get there, depending on the traffic. If you're planning to take public transport, expect the trip time to be around 55 minutes.

  • Want a relaxed start to your holiday? Stay near Seattle-Tacoma International Airport. Whether you have an early flight from Seattle to London or just don't want to be rushed, these hotels are just the thing:

  • 81.27% of flights leaving Seattle-Tacoma International Airport touch down at their destination as planned. Given its strong on-time stats, delays are unlikely when jetting out of SEA.

Arriving in London

London Heathrow Airport (LHR)

  • London Heathrow Airport (LHR) to central London takes around 55 minutes by car. The centre is roughly 26 kilometres away.

  • It usually takes 1 hour to get there on public transport.

  • If you're coming in on a late flight from Seattle to London, few things beat the convenience of staying near the terminal. Grab your luggage from the carousel and then be showered and snoozing soon after at one of these accommodation options near LHR:

  • Explore without limits with a London Heathrow Airport rental car. Pick up your wheels from Surprice, U-Save or Green Motion and venture far and wide through London and beyond.

  • Reserving your vehicle from London Heathrow Airport around one week in advance can help you get the best possible rate.

London Gatwick Airport (LGW)

  • Once your flight from Seattle to London has arrived, you can make your way to the city centre in around 1 hour 20 minutes by car. Central London is roughly 40 kilometres from London Gatwick Airport (LGW).

  • If you choose to travel on public transport, you'll reach the centre in 30 minutes or so.

  • After your flight from Seattle to London, rest your head at a hotel close to LGW. These are some comfortable options that'll help you slip into relaxation mode:

  • Green Motion, U-Save and Drivalia make collecting a London Gatwick Airport rental car simple. These reliable suppliers are located in or around the terminal and will get you on your way in no time.

  • Avoid last-minute price surges. Reserving your ride three weeks ahead of your arrival at LGW can get you a lower rate.

Stansted Airport (STN)

  • Hop off your flight from Seattle to London and go directly to your hotel or start exploring right away. Central London is around 48 kilometres from Stansted Airport (STN) and typically takes 1 hour to drive there.

  • The journey will take roughly 1 hour 25 minutes using public transport.

  • If you don't want to make the trip to the centre, head for a hotel near STN. Make yourself comfortable at one of these options after your Seattle to London flight:

  • Whether you want a budget-friendly compact for a solo getaway or a roomy SUV to fit everyone and their gear, you'll find the right Stansted Airport rental car for you. Explore the range of wheels available here from suppliers such as Green Motion, Drivalia and Europcar.

  • If you're looking for a specific model or make, book your ride from STN around four weeks ahead of your flight from Seattle to London. This gives you a better shot at getting the car you want, as well as a better price.

Best time to go to London

  • It's time to figure out your travel dates for your flight from Seattle to London. July is the most popular month for a trip to London. If you want a more peaceful vibe, go in February.

  • When booking your Seattle to London tickets, consider what kind of weather works for you. July is the warmest month in London, with temperatures ranging from 11ºC (52ºF) to 26ºC (79ºF).

  • If you want to travel in cooler conditions, search for a cheap flight from Seattle to London in January when temperatures average between 0ºC (32ºF) and 9ºC (48ºF).

More about London

  • Start your London trip off on the right foot by choosing the ideal place to stay. After booking your flight from Seattle to London, check out our selection of hotels including:

  • There are so many things to do and see in this city it can be hard to know where to begin. Big Ben, The British Museum and Buckingham Palace are popular attractions which should be on any well-planned London itinerary.

Explore more of United Kingdom

  • You've done London, now it's time to discover more of United Kingdom. Journey around 161 kilometres north-west to Birmingham to check off its top attractions. From Cadbury World to The Library of Birmingham and National Sea Life Centre, there's plenty to keep you busy.

  • If you want to check out another major destination in United Kingdom, head for Bristol, about 177 kilometres west of London. Clifton Suspension Bridge, Cabot Tower and Brandon Hill Nature Park are highlights.

Plan the rest of your trip from Seattle to London

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.