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)

All the information you need to plan the best SEA to LON flight in 2021: compare Seattle to London flight prices with the expected peak season, weather and rainfall in London.
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

$367

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 44% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $910 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $1,146.

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

October is one of the best times of the year to fly to London from Seattle. Prices for October average $714 per person but you can even find prices for as low as $445. The most expensive prices can be found in the month of July. Opting for a October flight can save you 31% on your journey compared to booking in October

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

Unlike in the morning, when flights are generally more expensive, you can save up to 6% on flights from Seattle to London by exploring options for tickets in the evening.

Cheap flights from Seattle to London in May, June 2021

The best prices found for SEA to LON flights for May, June
9 Jun - 17 Jun
$617pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
LGW
London Gatwick
LGW
London Gatwick
Multiple Airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl
7 Jun - 17 Jun
$717pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
LHR
London Heathrow
LHR
London Heathrow
Multiple Airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl
7 Jun - 20 Jun
$720pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
LHR
London Heathrow
LHR
London Heathrow
Multiple Airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl

Seattle to London 2021 flight deals

Cheap flights to London from Seattle found for this year
10 Sep - 18 Sep
$603pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
     
3 STOPS
LHR
London Heathrow
LHR
London Heathrow
Multiple Airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl
3 Sep - 10 Sep
$610pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
LHR
London Heathrow
LHR
London Heathrow
Multiple Airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl
30 Nov - 15 Dec
$613pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
LTN
London Luton
LTN
London Luton
Multiple Airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl

Non-stop flights to London from Seattle

Save time with Seattle to London direct flight deals
3 Oct - 20 Oct
$829pp
SEA
Seattle/Tacoma Intl
Finnair
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Finnair
Non-Stop
SEA
Seattle/Tacoma Intl
29 Sep - 13 Oct
$830pp
SEA
Seattle/Tacoma Intl
Finnair
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Finnair
Non-Stop
SEA
Seattle/Tacoma Intl
2 Nov - 9 Nov
$833pp
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
19 May - 9 Jun
$952pp
SEA
Seattle/Tacoma Intl
KLM
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
KLM
Non-Stop
SEA
Seattle/Tacoma Intl
19 May - 9 Jun
$1,036pp
SEA
Seattle/Tacoma Intl
SAS
   
2 STOPS
LHR
London Heathrow
LHR
London Heathrow
SAS
   
2 STOPS
SEA
Seattle/Tacoma Intl
17 May - 19 May
$1,062pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
LHR
London Heathrow
LHR
London Heathrow
Multiple Airlines
     
3 STOPS
SEA
Seattle/Tacoma Intl

One-way flights to London from Seattle

The cheapest one-way flights from Seattle to London
10:15 am - 5:45 am
Turkish Airlines
2 Stops
35h 30m
SEA - LGW
Turkish Airlines
$367
Fareboom
7:25 am - 5:05 pm
Multiple Airlines
2 Stops
25h 40m
SEA - LTN
Multiple Airlines
$368
Kiwi.com

Related info for your journey

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

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.

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

If you book a flight to London from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 5 flights from Seattle/Tacoma Intl to London per day from 19 different airlines.

Can I find flights from Seattle to London for under $700 on Cheapflights?

Yes, there are multiple flights from Seattle to London for under $700. The cheapest flight booked recently is on Multiple Airlines for just $603, but on average you can expect to pay $632.

Are there nonstop flights from Seattle to London for under $900 on Cheapflights?

Cheapflights has at least 20 direct flights from Seattle to London under $900. A good price for a nonstop flight from Seattle to London is less than $883.

Are there last-minute flights available from Seattle to London for under $1,000?

There are currently 20+ open flights from Seattle to London within the next 7 days for less than $1,000.

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 12h 05m. Fly via Icelandair or Aer Lingus to get the fastest option. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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 $625.

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

The cheapest airlines for a one-way flight from Seattle to London are Turkish Airlines ($363) and WestJet ($364).

Destination information for London

Things to know before you go - useful duration and weather info for your trip from Seattle to London.
Today's exchange rate
$1 = £0.71
Average temperature for May in London
64.4 °F
Avg rainfall for May in London
2.0 ″

Airports servicing Seattle

Airports servicing London

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

Top 10 airlines flying 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 cancel fee 77%
Lufthansa
$378 $592 No cancel fee 76%
KLM
$415 $609 No cancel 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 cancel fee 76%
Austrian Airlines
$438 $877 No cancel fee 78%

Hourly flight availability from Seattle to London

See what time of day planes typically take off from Seattle towards London.
Afternoon Noon to 6 PM 54% of SEA to LON departures
Evening 6 PM to midnight 45% of SEA to LON departures
Early morning Midnight to 6 AM 1% of SEA to LON departures
Morning 6 AM to noon 0% of SEA to LON departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Seattle to London
See how many times per day planes take to the skies headed from Seattle to London.
Sunday
5 daily flights
Monday
5 daily flights
Tuesday
8 daily flights
Wednesday
3 daily flights
Thursday
8 daily flights
Friday
3 daily flights
Saturday
8 daily flights
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