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

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The best prices from Seattle to London are usually found in October or January, booked 60 days in advance, depart on a Tuesday or Monday and return on a Tuesday

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

SEA - LON
Price
$487 - $787
LON
Temperature
48.2 - 73.4 °F
LON
Rainfall
1.4 - 2.8 inches

Popular in

December

High demand for flights, 27% potential price rise

Cheapest in

October

Best time to find cheap flights, 15% potential price drop

Round-trip from

$487

From Seattle to London

One-way from

$219

One-way flight from Seattle to London

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 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 61 days before your planned departure. Booking around this time can save you about 76% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $602 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $805.

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

March is one of the best times of the year to fly to London from Seattle. Prices for March average $453 per person but you can even find prices for as low as $327. The most expensive prices can be found in the month of December. Opting for a March flight can save you 39% on your journey compared to booking in March

When is the cheapest time to fly from Seattle to London (SEA - 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 November, December 2020

The best prices found for SEA to LON flights for November, December
20 Dec - 3 Jan
$531pp
SEA
Seattle/Tacoma Intl
Icelandair
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl
26 Dec - 12 Jan
$601pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
     
3 STOPS
LHR
London Heathrow
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl
3 Dec - 27 Dec
$608pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Finnair
Non-Stop
SEA
Seattle/Tacoma Intl

Seattle to London 2021 flight deals

Cheap flights to London from Seattle found for next year
20 Dec - 3 Jan
$531pp
SEA
Seattle/Tacoma Intl
Icelandair
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl
26 Dec - 12 Jan
$601pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
     
3 STOPS
LHR
London Heathrow
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl
3 Dec - 27 Dec
$608pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Finnair
Non-Stop
SEA
Seattle/Tacoma Intl

Non-stop flights to London from Seattle

Save time with Seattle to London direct flight deals
1 Feb - 8 Feb
$605pp
SEA
Seattle/Tacoma Intl
British Airways
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
British Airways
Non-Stop
SEA
Seattle/Tacoma Intl
25 Feb - 20 May
$609pp
SEA
Seattle/Tacoma Intl
British Airways
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
British Airways
Non-Stop
SEA
Seattle/Tacoma Intl
12 Dec - 17 Feb
$613pp
SEA
Seattle/Tacoma Intl
Finnair
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Finnair
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
3 Dec - 27 Dec
$608pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Finnair
Non-Stop
SEA
Seattle/Tacoma Intl
6 Dec - 1 Feb
$616pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Multiple Airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl
6 Dec - 1 Feb
$621pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
LHR
London Heathrow
LHR
London Heathrow
Multiple Airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl

One-way flights to London from Seattle

The cheapest one-way flights from Seattle to London
7:59 pm - 7:40 am
Multiple Airlines
3 Stops
51h 41m
SEA - LHR
Multiple Airlines
$219
Kiwi.com
2:46 pm - 7:40 am
Multiple Airlines
3 Stops
56h 54m
SEA - LHR
Multiple Airlines
$234
KAYAK
3:20 pm - 7:40 am
Multiple Airlines
3 Stops
32h 20m
SEA - LHR
Multiple Airlines
$237
Gotogate

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.

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

New policies can now be found on Delta to help keep travelers safe while flying. Airline carriers are regularly disinfecting and sanitizing 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 travelers safer while flying from Seattle/Tacoma Intl to London. Policies will vary by airline.

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

Delta, Virgin Atlantic, and British Airways are some of the carriers that may have flexible cancellation policies. You can use our site to filter for other airlines that may also have this kind of flexibility.

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 $452, but on average you can expect to pay $465.

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 $658.

Are there last-minute flights available from Seattle to London for under $700?

There are currently 20+ open flights from Seattle to London within the next 7 days for less than $700.

Is Seattle weather warmer or cooler than London?

Expect the weather to be around 77 °F on average in July. As the temperature peaks, try to get your plans done early, as flight price and availability will have an impact on your travels. The climate in London is generally colder than in Seattle.

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 $456. Icelandair is currently priced 20% below the average price you’ll pay for this route.

Destination information for London

Things to know before you go. Useful info for your trip from Seattle to London
Today's exchange rate
$1 = £0.75
Average temperature for November in London
53.6 °F
Avg rainfall for November in London
2.5 ″

Airports servicing Seattle

Airports servicing London

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

Top 10 airlines from Seattle to London

The chart below displays the airlines Cheapflights users traveling from Seattle to London 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
Air France
$414 $583 No change fee 77%
Lufthansa
$378 $592 No change fee 76%
KLM
$415 $609 No change fee 75%
Air Canada
$373 $633 No cancel fee 67%
Norwegian Air UK
$377 $635 No cancel fee N/A
United Airlines
$407 $642 No cancel fee 69%
Norwegian
$403 $697 No cancel fee 74%
American Airlines
$415 $735 No cancel fee 71%
Finnair
$335 $853 No change fee 76%
Austrian Airlines
$438 $877 No change fee 78%

Hourly flight availability from Seattle to London

Afternoon Noon to 6 PM 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
Evening 6 PM to midnight 0% of SEA to LON departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Seattle to London
Sunday
5 daily flights
Monday
5 daily flights
Tuesday
0 flights
Wednesday
5 daily flights
Thursday
0 flights
Friday
5 daily flights
Saturday
0 flights
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