Cheap flights from London to Seattle

Return
Economy
London (LON)
Seattle (SEA)
Depart
Return
Any month
Compare vs Cheapflights |

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 Monday 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 2022: compare London to Seattle flight prices with the expected peak season, weather and rainfall in Seattle.
LON - SEA
Price
£450 - £752
SEA
Temperature
5 - 19 °C
SEA
Rainfall
18 - 168 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

£359

From London (LON) to Seattle/Tacoma Intl

One-way from

£341

One-way flight from London (LON) to Seattle/Tacoma Intl

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
How far in advance should I book a flight from London to Seattle?

Travelers 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 £494, or £647 for flights within the next 24 hours.

What is the cheapest day to fly round-trip 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 8% on the overall cost on flights from London to Seattle.

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 £436 on average during February, but can be found for as low as £287.

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 19% on flights from London to Seattle by exploring options for tickets in the evening.

Cheap flights from London to Seattle in May, June 2022

The best prices found for LON to SEA flights in May, June
15 Jun - 6 Oct
£475pp
LHR
London Heathrow
Lufthansa
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Lufthansa
 
1 STOP
LHR
London Heathrow
6 Jun - 13 Jun
£475pp
LHR
London Heathrow
Air Canada
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Air Canada
   
2 STOPS
LHR
London Heathrow
7 Jun - 4 Jul
£477pp
LHR
London Heathrow
Air Canada
   
2 STOPS
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Air Canada
   
2 STOPS
LHR
London Heathrow

London to Seattle 2022 flight deals

Cheap flights to Seattle from London found for this year
20 Sep - 5 Oct
£425pp
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Icelandair
 
1 STOP
LHR
London Heathrow
20 Sep - 5 Oct
£428pp
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Icelandair
 
1 STOP
LHR
London Heathrow
12 Oct - 2 Nov
£428pp
LGW
London Gatwick
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Icelandair
 
1 STOP
LGW
London Gatwick

Direct flights to Seattle from London

Save time with London to Seattle direct flight deals
12 Oct - 2 Nov
£482pp
LHR
London Heathrow
British Airways
Direct
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
British Airways
Direct
LHR
London Heathrow
7 Sep - 28 Sep
£502pp
LHR
London Heathrow
Virgin Atlantic
Direct
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Virgin Atlantic
Direct
LHR
London Heathrow
21 Jun - 5 Jul
£503pp
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
2 Jun - 15 Dec
£560pp
LHR
London Heathrow
Multiple airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Lufthansa
 
1 STOP
LHR
London Heathrow
2 Jun - 15 Dec
£562pp
LHR
London Heathrow
Lufthansa
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Lufthansa
 
1 STOP
LHR
London Heathrow
31 May - 8 Jun
£571pp
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Icelandair
 
1 STOP
LHR
London Heathrow

One-way flights to Seattle/Tacoma Intl from London

The cheapest one-way flights from London to Seattle
15:40 - 07:55
Multiple Airlines
2 stops
24h 15m
STN - SEA
Multiple Airlines
£341
Combigo
15:30 - 19:53
Scandinavian Airlines
2 stops
36h 23m
LHR - SEA
Scandinavian Airlines
£349
ScholarTrip

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 center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Seattle from London. Booking flights from London to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 17 daily inbound flights from London from 16 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. Virgin Atlantic, British Airways, and Finnair are some of the carriers where you may find flexible cancellation policies. You can use our site to filter for airlines like Virgin Atlantic with this kind of flexibility.

Can I find flights from London to Seattle for under £500 on Cheapflights?

Yes, there are multiple flights from London to Seattle for under £500. The cheapest flight booked recently is on Icelandair for just £425, but on average you can expect to pay £440.

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

Cheapflights has at least 20 direct flights from London to Seattle under £500. A good price for a nonstop flight from London to Seattle is less than £523.

Are there last-minute flights available from London to Seattle for under £600?

There are currently 20+ open flights from London to Seattle within the next 7 days for less than £600.

What are the cheapest airlines flying from London to Seattle round-trip?

Icelandair, at £425, was found to be the cheapest airline from London to Seattle.Alternate airlines to your destination round-trip include Lufthansa and United Airlines. Icelandair is priced at 2% lower than the current average price of a flight leaving 3 months from now.

What are the most popular airlines that fly from London to Seattle?

Before booking your flight from London to Seattle check out the most popular airlines for this route: American Airlines, Air Canada or Air France.

What are the cheapest flights from London to Seattle?

On average you can expect to pay £1,993 for a flight from London to Seattle. The cheapest flight overall is £436 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £425.

What are the most popular routes from London to Seattle?

When deciding which route to take from London to Seattle consider London Heathrow - Seattle/Tacoma Intl, London Gatwick - Seattle/Tacoma Intl or London City - Seattle/Tacoma Intl as they are the most popular.

What are the most reliable airlines from London to Seattle?

Consider Alaska Airlines (91%), American Airlines (75%) or Finnair (75%) when booking your flight. These represent the most reliable airlines when flying from London to Seattle.

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 need to provide a negative COVID-19 test result and/or quarantine 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 1 day for RT-PCR (NAAT) and 1 day for Antigen (quick-test) 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 are not required to present a negative COVID-19 PCR test or antigen result upon entering 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 = $1.26
Average temperature for May in Seattle
19.0 °C
Avg rainfall for May in Seattle
45.0 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
Norwegian Air UK
£308 £564 No cancel fee N/A
Search Norwegian Air UK flights
Delta
£317 £661 No cancel fee N/A
Search Delta flights
Norwegian
£340 £464 No cancel fee 74%
Search Norwegian flights
United Airlines
£342 £507 No cancel fee 69%
Search United Airlines flights
Icelandair
£361 £496 No cancel fee 76%
Search Icelandair flights
American Airlines
£367 £640 No cancel fee 71%
Search American Airlines flights
Virgin Atlantic
£398 £597 No cancel fee 72%
Search Virgin Atlantic flights
Lufthansa
£406 £539 No cancel fee 76%
Search Lufthansa flights
KLM
£410 £604 No cancel fee 75%
Search KLM flights
Air Canada
£416 £535 No cancel fee 67%
Search Air Canada 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 63% of flight departures
Morning 6 AM to midday 36% 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
14 daily flights
Monday
20 daily flights
Tuesday
20 daily flights
Wednesday
14 daily flights
Thursday
19 daily flights
Friday
19 daily flights
Saturday
19 daily flights
Home North America USA Washington Seattle Cheap flights from London to Seattle
  • Return
  • One-way
  • Multi-city
  • Economy
  • Premium Economy
  • Business
  • First
  • Multiple
Economy
  • Economy
  • Premium Economy
  • Business
  • First
Economy
  • Economy
  • Premium Economy
  • Business
  • First
Economy
  • Economy
  • Premium Economy
  • Business
  • First
Economy
  • Economy
  • Premium Economy
  • Business
  • First
Economy
  • Economy
  • Premium Economy
  • Business
  • First
Economy
  • Economy
  • Premium Economy
  • Business
  • First