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Cheap flights from Seattle (SEA) to London (LON)

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

What is the cheapest day to fly round-trip from Seattle to London?

Monday is generally a great day to depart. Flying on this day could help you save up to 18%.

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

To save on the cost of your flight from Seattle to London, book at least 51 days before your planned departure. Booking around this time can save you about 38% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $813 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $886.

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

February is one of the best times of the year to fly to London from Seattle. Prices for February average $634 per person but you can even find prices for as low as $394. The most expensive prices can be found in the month of June. Opting for a February flight can save you 66% on your journey compared to booking in February

When is the cheapest time to fly from Seattle to London (03A - LON)?

Unlike in the evening, when flights are generally more expensive, you can save up to 9% on flights from Seattle to London by exploring options for tickets in the morning.

Cheap flights from Seattle to London in September, October 2020

The best prices found for SEA to LON flights for September, October
27 Oct - 10 Nov
$520pp
SEA
Seattle/Tacoma Intl
Icelandair
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl
19 Oct - 28 Oct
$523pp
SEA
Seattle/Tacoma Intl
Icelandair
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl
11 Oct - 3 Nov
$529pp
SEA
Seattle/Tacoma Intl
Icelandair
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl

Seattle to London 2020 flight deals

Cheap flights to London from Seattle found for this year
13 Nov - 16 Nov
$472pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
LHR
London Heathrow
LHR
London Heathrow
Multiple Airlines
     
3 STOPS
SEA
Seattle/Tacoma Intl
27 Oct - 10 Nov
$520pp
SEA
Seattle/Tacoma Intl
Icelandair
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl
19 Oct - 28 Oct
$523pp
SEA
Seattle/Tacoma Intl
Icelandair
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl

Non-stop flights to London from Seattle

Save time with Seattle to London direct flight deals
13 Jan - 3 Feb
$686pp
SEA
Seattle/Tacoma Intl
Finnair
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Finnair
Non-Stop
SEA
Seattle/Tacoma Intl
1 Dec - 8 Dec
$696pp
SEA
Seattle/Tacoma Intl
Finnair
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Finnair
Non-Stop
SEA
Seattle/Tacoma Intl
13 Jan - 3 Feb
$715pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Iberia
Non-Stop
SEA
Seattle/Tacoma Intl

Last minute flights from Seattle to London

Late deals on round-trip flights to London from Seattle, departing today and this week
24 Sep - 10 Nov
$588pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
     
3 STOPS
LHR
London Heathrow
LHR
London Heathrow
Multiple Airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl
24 Sep - 9 Oct
$637pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
     
3 STOPS
LHR
London Heathrow
LHR
London Heathrow
Multiple Airlines
     
3 STOPS
SEA
Seattle/Tacoma Intl
24 Sep - 3 Mar
$665pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
LHR
London Heathrow
LHR
London Heathrow
Aer Lingus
 
1 STOP
SEA
Seattle/Tacoma Intl

One-way flights to London from Seattle

The cheapest one-way flights from Seattle to London
3:50 am - 8:45 am
Multiple Airlines
2 Stops
20h 55m
SEA - LHR
Multiple Airlines
5:30 pm - 8:45 am
Multiple Airlines
2 Stops
31h 15m
SEA - LHR
Multiple Airlines
7:32 am - 11:45 am
Multiple Airlines
3 Stops
45h 13m
SEA - LGW
Multiple Airlines
$166
Kiwi.com

Related info for your journey

Useful info, stats and facts about Seattle to London flights.

Flight FAQs

From Seattle to London

Are flight prices decreasing from Seattle to London 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 Seattle and London 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 Seattle to London for under $500 on Cheapflights?

Yes, there are multiple flights from Seattle to London for under $500. The cheapest flight booked recently is on Multiple Airlines for just $472, but on average you can expect to pay $527.

Are there nonstop flights from Seattle to London for under $700 on Cheapflights?

Cheapflights has at least 20 direct flights from Seattle to London under $700. A good price for a nonstop flight from Seattle to London is less than $773.

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

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

Is Seattle weather warmer or cooler than London?

Our data indicates that the weather will be 77 °F on average in the month of July. The temperature in London is typically colder than in Seattle. 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 is the flight from Seattle to London?

There are many flights that can get you from Seattle to London in 11h 55m. Fly via Icelandair to get the fastest option.

What is the cheapest airline to fly from Seattle to London round-trip?

Flying on Icelandair is currently your cheapest option to London, with prices starting at $516.

Destination information for London

Things to know before you go. Useful info for your trip from Seattle to London
Today's exchange rate
$1 = £0.78
Average temperature for September in London
68.0 °F
Avg rainfall for September in London
1.9 ″

Airports servicing Seattle

Seattle King County/Boeing (BFI)
Seattle Lake Union Spb (LKE)

Airports servicing London

Heathrow (LHR)
Luton (LTN)
Stansted (STN)
City (LCY)
Southend (SEN)

Hourly flight availability from Seattle to London

Evening 6 PM to midnight 100% of SEA to LON departures
Early morning Midnight to 6 AM 0% of SEA to LON departures
Morning 6 AM to noon 0% of SEA to LON departures
Afternoon Noon to 6 PM 0% of SEA to LON departures
Midnight
6 AM
Noon
6 PM
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