Cheap flights from London to Seattle

Return
Economy
London (LON)
Seattle (SEA)
Depart
Return
Any month
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The best prices from London to Seattle are usually found in February or March, booked 54 days in advance, depart on a Tuesday or Thursday and return on a Tuesday

How to find the cheapest flight from
London (LON) to Seattle (SEA)

All the information you need to plan the best LON to SEA flight in 2021: compare London to Seattle flight prices with the expected peak season, weather and rainfall in Seattle.
LON - SEA
Price
£327 - £547
SEA
Temperature
8 - 25 °C
SEA
Rainfall
18 - 166 mm

Popular in

July

High demand for flights, 27% potential price rise

Cheapest in

February

Best time to find cheap flights, 18% potential price drop

Round-trip from

£327

From London to Seattle

One-way from

£238

One-way flight from London to Seattle

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest day to fly return from London to Seattle?

Saturday flights are generally found to be more expensive for flights from London to Seattle. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Seattle.

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

Travellers have found it’s best to book a flight 52 days in advance to save up to 51% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 52 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from London to Seattle 1-2 weeks in advance for as low as £450, or £590 for flights within the next 24 hours.

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

The best pricing can be found in the month of February. Prices to Seattle from London average £398. You can even find prices in February for less than £398, as users have found deals to Seattle from as low as £262. The month of July appears to be one of the more expensive times to travel to Seattle from London. Flying in the targeted month can save you up to 37%.

When is the cheapest time to fly from London to Seattle (LON - SEA)?

It’s optimal to fly from London to Seattle in the evening. By choosing this option you can save up to 16% on the cost of your flight, compared to a flight in the afternoon.

Cheap flights from London to Seattle in April, May 2021

The best prices found for LON to SEA flights in April, May
29 Apr - 6 May
£316pp
LHR
London Heathrow
Virgin Atlantic
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
 
1 STOP
LHR
London Heathrow
29 Apr - 6 May
£330pp
LHR
London Heathrow
Virgin Atlantic
Direct
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
 
1 STOP
LHR
London Heathrow
27 Apr - 6 May
£332pp
LHR
London Heathrow
Virgin Atlantic
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
Direct
LHR
London Heathrow

London to Seattle 2021 flight deals

Cheap flights to Seattle from London found for this year
29 Apr - 6 May
£316pp
LHR
London Heathrow
Virgin Atlantic
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
 
1 STOP
LHR
London Heathrow
29 Apr - 6 May
£330pp
LHR
London Heathrow
Virgin Atlantic
Direct
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
 
1 STOP
LHR
London Heathrow
27 Apr - 6 May
£332pp
LHR
London Heathrow
Virgin Atlantic
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
Direct
LHR
London Heathrow

Direct flights to Seattle from London

Save time with London to Seattle direct flight deals
15 Jun - 26 Jun
£353pp
LHR
London Heathrow
Virgin Atlantic
Direct
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
Direct
LHR
London Heathrow
25 Jun - 30 Jul
£355pp
LHR
London Heathrow
Virgin Atlantic
Direct
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
Direct
LHR
London Heathrow
11 Sep - 25 Sep
£359pp
LHR
London Heathrow
Virgin Atlantic
Direct
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
Direct
LHR
London Heathrow

Last-minute flights from London to Seattle

Late deals on return flights to Seattle from London, departing today and this week
22 Apr - 29 Apr
£408pp
LHR
London Heathrow
Multiple airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
 
1 STOP
LHR
London Heathrow
22 Apr - 29 Apr
£425pp
LHR
London Heathrow
Virgin Atlantic
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
 
1 STOP
LHR
London Heathrow
24 Apr - 2 May
£434pp
LHR
London Heathrow
Lufthansa
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Lufthansa
 
1 STOP
LHR
London Heathrow

One-way flights to Seattle from London

The cheapest one-way flights from London to Seattle
06:00 - 17:58
Virgin Atlantic
2 stops
19h 58m
LCY - SEA
Virgin Atlantic
£238
Travel2Be
02:30 - 07:29
Delta
1 stop
12h 59m
LHR - SEA
Delta
£249
Delta
06:00 - 17:58
KLM
2 stops
19h 58m
LCY - SEA
KLM
£268
KLM

Related info for your journey

Useful info, stats and facts about <span class="emphasized">London</span> to <span class="emphasized">Seattle</span> flights.

Flight FAQs

From London to Seattle

Are flight prices decreasing from London to Seattle due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both London and Seattle for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

What safety measures are being taken by airlines flying from London to Seattle/Tacoma Intl to control the spread of COVID-19?

Airlines globally have implemented additional safety measures to accommodate you. Delta is one of them. Airline carriers are regularly disinfecting and sanitising their aircraft. Masks are provided and are mandatory while on board. Pre-flight testing for symptoms and antibodies, alongside socially-distanced seating (for a limited time) will work towards keeping travellers safer while flying from London to Seattle/Tacoma Intl. Policies will vary by airline.

Which airlines flying from London to Seattle/Tacoma Intl have flexible cancellations due to COVID-19?

Some of our airline partners flying from London to Seattle/Tacoma Intl have new flexible policies in place due to COVID-19. British Airways, Virgin Atlantic, and United Airlines are some of the carriers where you may find flexible cancellation policies. You can use our site to filter for airlines like British Airways with this kind of flexibility.

Can I find flights from London to Seattle for under £364 on Cheapflights?

Yes, there are multiple flights from London to Seattle for under £364. The cheapest flight booked recently is on Virgin Atlantic for just £316, but on average you can expect to pay £341.

Are there direct flights from London to Seattle for under £364 on Cheapflights?

Cheapflights has 20 direct flights from London to Seattle under £364. A good price for a direct flight from London to Seattle is less than £418.

Are there last-minute flights available from London to Seattle for under £437?

There are currently 20+ open flights from London to Seattle within the next 7 days for less than £437.

Is London weather warmer or cooler than Seattle?

Our data indicates that the weather will be 25 °C on average in the month of July. The temperature in Seattle is typically hotter than in London. If you're traveling when the temperature is at its warmest, push to plan early, as flight price and availability will have an impact on your travels. For the best results, search for flights well in advance or after peak season.

How long does is the flight from London to Seattle?

There are many flights that can get you from London to Seattle in 9h 40m. Fly via Virgin Atlantic, Icelandair, or KLM to get the fastest option. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

What are the cheapest airlines to flying from London to Seattle return?

Virgin Atlantic, at £316, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include United Airlines and Lufthansa. Users have found that Virgin Atlantic is 20% cheaper than the other options available to this destination.

What are the cheapest airlines to fly from London to Seattle one-way?

For one-way options, check prices for Virgin Atlantic. According to our data, you can fly for as low as £224. Users have also found prices from £249 and £253 on Virgin Atlantic and Delta, respectively.

Alternative routes for London to Seattle

See prices for flight routes from nearby airports that may be better suited for you.

Destination information for Seattle

Things to know before you go - useful duration and weather info for your trip from London to Seattle.
Today's exchange rate
£1 = $1.38
Average temperature for April in Seattle
16.0 °C
Avg rainfall for April in Seattle
75.0 mm

Airports servicing London

Gatwick (LGW)
City (LCY)
Stansted (STN)
Luton (LTN)
Southend (SEN)

Airports servicing Seattle

Top 10 airlines flying from London to Seattle

The chart below displays the airlines Cheapflights users travelling from London to Seattle choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
Austrian Airlines
£311 £439 No cancel fee 78%
Search Austrian Airlines flights
Norwegian
£426 £582 No cancel fee 74%
Search Norwegian flights
Lufthansa
£374 £625 No cancel fee 76%
Search Lufthansa flights
Air Canada
£358 £634 No cancel fee 67%
Search Air Canada flights
SWISS
£510 £666 No cancel fee 79%
Search SWISS flights
Iberia
£402 £690 No cancel fee 77%
Search Iberia flights
KLM
£388 £697 No cancel fee 75%
Search KLM flights
Norwegian Air UK
£386 £707 No cancel fee N/A
Search Norwegian Air UK flights
Icelandair
£444 £750 No cancel fee 76%
Search Icelandair flights
Air France
£415 £762 No cancel fee 77%
Search Air France flights

Hourly flight availability from London to Seattle

See what time of day planes typically take off from London towards Seattle.
Afternoon Midday to 6 PM 50% of flight departures
Morning 6 AM to midday 49% of flight departures
Early morning Midnight to 6 AM 1% of flight departures
Evening 6 PM to midnight 0% of flight departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from London to Seattle
See how many times per day planes take to the skies headed from London to Seattle.
Sunday
8 daily flights
Monday
5 daily flights
Tuesday
5 daily flights
Wednesday
9 daily flights
Thursday
5 daily flights
Friday
9 daily flights
Saturday
5 daily flights
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