Cheap Flights from Seattle to London from RM2,156

Compare Seattle to London flight deals

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

Book the best London fare with no extra fees

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.RM2,156 per passenger.Departing Fri, 27 Feb, returning Thu, 12 Mar.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Fri, 27 Feb, arriving in London Gatwick.Inbound indirect flight with Icelandair, departs from London Gatwick on Thu, 12 Mar, arriving in Seattle / Tacoma International.Price includes taxes and charges.From RM2,156, select.

London.RM2,158 per passenger.Departing Wed, 4 Mar, returning Wed, 11 Mar.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Wed, 4 Mar, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Gatwick on Wed, 11 Mar, arriving in Seattle / Tacoma International.Price includes taxes and charges.From RM2,158, select.

London.RM2,220 per passenger.Departing Wed, 1 Apr, returning Mon, 20 Apr.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Wed, 1 Apr, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Gatwick on Mon, 20 Apr, arriving in Seattle / Tacoma International.Price includes taxes and charges.From RM2,220, select.

London.RM2,227 per passenger.Departing Wed, 30 Sep, returning Thu, 15 Oct.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Wed, 30 Sep, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Gatwick on Thu, 15 Oct, arriving in Seattle / Tacoma International.Price includes taxes and charges.From RM2,227, select.

London.RM2,236 per passenger.Departing Mon, 9 Feb, returning Wed, 25 Feb.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Mon, 9 Feb, arriving in London Gatwick.Inbound indirect flight with Icelandair, departs from London Gatwick on Wed, 25 Feb, arriving in Seattle / Tacoma International.Price includes taxes and charges.From RM2,236, select.

London.RM2,240 per passenger.Departing Tue, 10 Mar, returning Thu, 30 Apr.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Tue, 10 Mar, arriving in London Gatwick.Inbound indirect flight with Icelandair, departs from London Gatwick on Thu, 30 Apr, arriving in Seattle / Tacoma International.Price includes taxes and charges.From RM2,240, select.

London.RM2,256 per passenger.Departing Tue, 28 Apr, returning Tue, 5 May.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Tue, 28 Apr, arriving in London Gatwick.Inbound indirect flight with Icelandair, departs from London Gatwick on Tue, 5 May, arriving in Seattle / Tacoma International.Price includes taxes and charges.From RM2,256, select.

London.RM2,261 per passenger.Departing Fri, 23 Oct, returning Thu, 29 Oct.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Fri, 23 Oct, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Thu, 29 Oct, arriving in Seattle / Tacoma International.Price includes taxes and charges.From RM2,261, 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 March.

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Jan

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 found	RM2,156
Cheapest month to fly	February
Average flight time	9 hrs, 35 mins
Most popular airline	KLM
Average flights per week	184

Check out these London hotels

Ready to plan your stay? Other travellers rate these London hotels for cleanliness, service and location.

The Milestone Hotel - London

4.12 km from city centre

RM1,513

Per night

Aethos London Shoreditch

3.66 km from city centre

RM1,573

Per night

Hotel 41

1.54 km from city centre

RM1,697

Per night

The Milestone Hotel - London

4.12 km from city centre

RM1,513

Per night

Aethos London Shoreditch

3.66 km from city centre

RM1,573

Per night

Hotel 41

1.54 km from city centre

RM1,697

Per night

Explore top-rated hotels

Finding cheap flights from Seattle to London: Frequently asked questions

How many airports are there in London?

There are 6 airports in London: London City, London Heathrow, London Gatwick, London Luton, London Stansted, and London Southend.

How much are return flights from Seattle to London?

The best price we found for a return flight from Seattle to London is RM2,156. 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.

How long does it take to fly from Seattle to London?

9 hours and 35 minutes is the average flight time from Seattle to London.

Which airlines fly direct from Seattle to London?

KLM, Air France and Delta fly direct from Seattle to London.

How many flights are there a week from Seattle to London?

As of February 2026, there are 184 flights per week flying from Seattle to London.

When is the cheapest time to fly from Seattle to London?

The cheapest month to fly from Seattle to London is usually February.

Which is the cheapest airport to fly into in London?

If you're flying from Seattle, the cheapest airport near London is London Gatwick – which is 40.3 km away from the centre of London. We've found flights into this airport from RM2,156.

Which upcoming date is cheapest to fly from Seattle to London on?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle to London on Friday, 27 February 2026.

Can I get a direct flight from Seattle to London?

Yes – the average flight time is 9 hours and 35 minutes.

How can I get the best flight deal from Seattle to London?

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.

When is the best time to book flights to London?

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.

What’s the weather like in London?

In February, the average temperature is usually around 4°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.

Which is the cheapest airline to fly from Seattle to London with?

The cheapest airline that flies to London is Icelandair. And the cheapest airline that flies to London Heathrow Airport is British Airways.

Flying from Seattle to London: what you need to know

Seattle is home to two main airports where you can kick off your trip. Explore your options for booking a flight from Seattle to London flying out of Seattle-Tacoma International Airport (SEA) or Lake Union Sea Plane Base Airport (LKE).
Touch down at London Heathrow Airport (LHR), London Gatwick Airport (LGW) or Stansted Airport (STN). You can also hop off the plane at London Luton Airport (LTN) and London City Airport (LCY) in London.
Around 9 hours 35 minutes is how long you'll be in transit on a direct Seattle to London flight.
London is seven hours ahead of Seattle and is in 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. Hop on the earliest flight from Seattle to London with British Airways at 13:30. If you prefer to get more out of your day before jetting off, the latest departure from SEA to LHR is with Delta Air Lines at 20:25.
For a smooth journey, arrive at the airport two hours ahead of international flights and one hour before domestic departures. This leaves you with plenty of time to catch your Seattle to London flight.
During popular months like July, it's best to get to the airport even earlier. Arrive two hours before a domestic departure and four hours ahead of an international flight whenever you're flying during a peak period in general.

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 get a direct flight from Seattle to London taking off from Seattle-Tacoma International Airport (SEA). Begin your journey at SEA and come in for landing at London Heathrow Airport (LHR).
Well-known carriers that offer direct Seattle to London plane tickets departing from SEA include:
We make it a cinch to find a Seattle to London flight with a stopover. To see the options departing from Seattle-Tacoma International Airport, deselect 'Direct flights only.' Then, simply select a flight offering a stop long enough to see the sights of your chosen city. Popular stopovers include:
- Amsterdam Airport Schiphol (AMS)
- Frankfurt Airport (FRA)
- Charles de Gaulle Airport (CDG)
Travelling from central Seattle to SEA takes about 55 minutes by public transport. If you ride-share, drive or get a cab, you'll cover the 18 kilometres in 20 minutes or so, depending on traffic conditions.
After a hassle-free start to your journey? Stay near Seattle-Tacoma International Airport. Whether you're boarding an early flight from Seattle to London or want to avoid feeling rushed, these hotels are perfect:
81.27% of flights departing from Seattle-Tacoma International Airport land at their destination according to schedule. With its strong on-time performance, disruptions are unlikely when taking off from SEA.

Arriving in London

London Heathrow Airport (LHR)

The distance from London Heathrow Airport (LHR) to central London is approximately 23 kilometres. It takes about 55 minutes to get to the centre driving.
If you're using public transport, expect a journey time of around 1 hour.
The last thing you need is a lengthy journey to your hotel if you're getting in late on a flight from Seattle to London. Check in to one of these accommodation options near LHR instead:
Go wherever you want, whenever you want with a London Heathrow Airport rental car. Pick up a set of wheels from Surprice, U-Save or Green Motion and venture far and wide through London and beyond.
Booking your vehicle from London Heathrow Airport about one week in advance boosts your odds of scoring a great price.

London Gatwick Airport (LGW)

The centre of London is about 40 kilometres from London Gatwick Airport (LGW). Once your flight from Seattle to London has hit the runway and you've navigated your way to arrivals, expect a drive of about 1 hour 20 minutes.
If you hop on public transport, you'll reach the centre in 30 minutes or so.
Place the 'Do not disturb' sign on your door and rest at a hotel close to LGW. Here are a few options where you can take a load off after your flight from Seattle to London:
Forget about inconvenient public transport schedules or waiting forever for a cab. Grab a London Gatwick Airport rental car and go in any direction that inspires you. Compare offers from Green Motion, U-Save and Drivalia.
Snap up the best price by securing your ride from LGW three weeks in advance. You can also expect to have a greater selection of vehicles.

Stansted Airport (STN)

Hop off your flight from Seattle to London and head directly to your hotel or start exploring right away. The centre of London is around 48 kilometres from Stansted Airport (STN) and typically takes 1 hour to reach by car.
If you're using public transport, the journey time is around 1 hour 25 minutes.
Choose a hotel close to STN and get from baggage claim to your bed in a snap. Whether you're coming in on a late Seattle to London flight or just want an easier arrival, these stays put comfort right within reach:
Take control of the next part of your trip by picking up a Stansted Airport rental car. Green Motion, Drivalia and Europcar are reliable rental providers.
About four weeks before your flight from Seattle to London is the ideal time to secure your vehicle from STN. You're more likely to get a better rate or pick up some early bird promotions.

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 right by choosing the ideal place to stay. Once you've booked your flight from Seattle to London, check out our range of accommodation options including:
There are so many things to see and do in this city it can be difficult to know where to begin. Big Ben, The British Museum and Buckingham Palace are popular attractions which should feature on every 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.