Cheap flights from London to Seattle

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London (LON)
Seattle (SEA)
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The best prices from London to Seattle/Tacoma Intl 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
£325 - £544
SEA
Temperature
8 - 25 °C
SEA
Precipitation
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

£325

From London to Seattle/Tacoma Intl

One-way from

£226

One-way flight from London to Seattle/Tacoma Intl

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?

Leaving on a Monday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 16% on the overall cost on flights from London 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 £448, or £586 for flights within the next 24 hours.

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

Due to multiple factors, expect to potentially pay more when booking in July. For low rates, February can be a great choice for travel to Seattle. Flights to Seattle from London in February are about £395 on average during February, but can be found for as low as £260.

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

Unlike in the afternoon, when flights are generally more expensive, you can save up to 16% on flights from London to Seattle by exploring options for tickets in the evening.

Cheap flights from London to Seattle in September, October 2021

The best prices found for LON to SEA flights in September, October
26 Oct - 2 Nov
£360pp
LHR
London Heathrow
Virgin Atlantic
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
 
1 STOP
LHR
London Heathrow
9 Oct - 23 Oct
£393pp
LHR
London Heathrow
Multiple airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Air Canada
   
2 STOPS
LHR
London Heathrow
15 Oct - 22 Oct
£394pp
LHR
London Heathrow
Multiple airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
LHR
London Heathrow

London to Seattle 2021 flight deals

Cheap flights to Seattle from London found for this year
20 Nov - 21 Nov
£351pp
LHR
London Heathrow
United Airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
United Airlines
 
1 STOP
LHR
London Heathrow
26 Oct - 2 Nov
£360pp
LHR
London Heathrow
Virgin Atlantic
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
 
1 STOP
LHR
London Heathrow
2 Nov - 23 Nov
£362pp
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
1 Mar - 21 Mar
£404pp
LHR
London Heathrow
Virgin Atlantic
Direct
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
Direct
LHR
London Heathrow
1 Feb - 8 Feb
£405pp
LHR
London Heathrow
Virgin Atlantic
Direct
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
Direct
LHR
London Heathrow
8 Nov - 16 Dec
£413pp
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
24 Sep - 22 Oct
£456pp
LHR
London Heathrow
Multiple airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Air Canada
   
2 STOPS
LHR
London Heathrow
24 Sep - 22 Oct
£456pp
LHR
London Heathrow
Multiple airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Air Canada
 
1 STOP
LHR
London Heathrow
25 Sep - 28 Oct
£460pp
LHR
London Heathrow
Multiple airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Air Canada
 
1 STOP
LHR
London Heathrow

One-way flights to Seattle/Tacoma Intl from London

The cheapest one-way flights from London to Seattle
04:00 - 06:29
Multiple Airlines
2 stops
34h 29m
STN - SEA
Multiple Airlines
£226
Kiwi.com
04:25 - 06:30
Multiple Airlines
2 stops
34h 05m
STN - SEA
Multiple Airlines
£232
Kiwi.com
19:30 - 08:05
Multiple Airlines
2 stops
20h 35m
LGW - SEA
Multiple Airlines
£236
Kiwi.com

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

What airport do you fly into for flights to Seattle from London?

Located just 11.4 mi from the city centre, Seattle/Tacoma Intl is the airport most travellers will use when flying to Seattle from London. Booking flights from London to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 10 daily inbound flights from London from 18 different airlines.

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.

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.

Can I find flights from London to Seattle for under £400 on Cheapflights?

Yes, there are multiple flights from London to Seattle for under £400. The cheapest flight booked recently is on United Airlines for just £351, but on average you can expect to pay £380.

Are there direct flights from London to Seattle for under £500 on Cheapflights?

Cheapflights has 20 direct flights from London to Seattle under £500. A good price for a direct flight from London to Seattle is less than £442.

Are there last-minute flights available from London to Seattle for under £500?

There are currently 20+ open flights from London to Seattle within the next 7 days for less than £500.

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

United Airlines, at £351, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Virgin Atlantic and Icelandair. United Airlines is currently priced 11% below the average price you’ll pay for this route.

COVID Restrictions

View COVID Travel Restrictions for Seattle, WA

Do I need a COVID test to fly to Seattle from London?

Information is based on travel restrictions from London to Seattle/Tacoma Intl

Most visitors from London will not be allowed to enter Seattle/Tacoma Intl.

COVID-19 testing requirements
Visitors from London must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Seattle/Tacoma Intl.

Quarantine requirements
Visitors from London are not required to quarantine after entering Seattle/Tacoma Intl.

Do I need a test to fly back to London from Seattle?

Returning to London from Seattle/Tacoma Intl

COVID-19 testing requirements
Visitors from Seattle/Tacoma Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to London.

Quarantine requirements
Visitors from Seattle/Tacoma Intl are not required to quarantine after entering London.

Hide COVID Travel Restrictions for Seattle, WA

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 = $1.39
Average temperature for September in Seattle
23.0 °C
Avg rainfall for September in Seattle
26.0 mm

Airports servicing London

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

Airports servicing Seattle

Top 10 airlines flying from London to Seattle/Tacoma Intl

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.
Morning 6 AM to midday 54% of flight departures
Afternoon Midday to 6 PM 45% 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
10 daily flights
Monday
10 daily flights
Tuesday
10 daily flights
Wednesday
10 daily flights
Thursday
10 daily flights
Friday
10 daily flights
Saturday
10 daily flights
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