Cheap flights from Seattle-Tacoma International (SEA) to London (LON)

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The best prices from Seattle-Tacoma International 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-Tacoma International (SEA) to London (LON)

All the information you need to plan the best SEA to LON flight in 2021: compare Seattle-Tacoma International 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-Tacoma International to London

One-way from

$337

One-way flight from Seattle-Tacoma International 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-Tacoma International to London?

Flights from Seattle-Tacoma International to London are found to be more expensive on Thursday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to London.

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

To save up to 44% on this flight, we recommend booking at least 61 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Seattle-Tacoma International to London from $910 1-2 weeks out and tickets from $1,146 for flights departing within the next 72 hours.

What is the cheapest month to fly from Seattle-Tacoma International to London?

October can be a great time to fly to London from Seattle-Tacoma International with a flight ticket averaging about $714. Cheapflights users have found deals in the month of October for as cheap as $445. The most expensive prices can be found in the month of July.

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

It’s optimal to fly from Seattle-Tacoma International to London in the evening. By choosing this option you can save up to 6% on the cost of your flight, compared to a flight in the morning.

Cheap flights from Seattle-Tacoma International to London in May, June 2021

The best prices found for SEA to LON flights for May, June
7 Jun - 13 Jun
$763pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
LGW
London Gatwick
LGW
London Gatwick
Multiple Airlines
     
3 STOPS
SEA
Seattle/Tacoma Intl
30 Jun - 2 Jul
$768pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
30 Jun - 6 Jul
$774pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Multiple Airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl

Seattle-Tacoma International to London 2021 flight deals

Cheap flights to London from Seattle-Tacoma International found for this year
25 Aug - 6 Oct
$636pp
SEA
Seattle/Tacoma Intl
Icelandair
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Icelandair
 
1 STOP
SEA
Seattle/Tacoma Intl
3 Oct - 20 Oct
$637pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
     
3 STOPS
LHR
London Heathrow
LHR
London Heathrow
Multiple Airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl
3 Oct - 11 Oct
$638pp
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-Tacoma International

Save time with Seattle-Tacoma International to London direct flight deals
3 Oct - 20 Oct
$832pp
SEA
Seattle/Tacoma Intl
Finnair
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Finnair
Non-Stop
SEA
Seattle/Tacoma Intl
2 Nov - 19 Nov
$834pp
SEA
Seattle/Tacoma Intl
Finnair
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Finnair
Non-Stop
SEA
Seattle/Tacoma Intl
16 Jun - 30 Jun
$849pp
SEA
Seattle/Tacoma Intl
Delta
Non-Stop
LHR
London Heathrow
LHR
London Heathrow
Delta
Non-Stop
SEA
Seattle/Tacoma Intl

Last minute flights from Seattle-Tacoma International to London

Late deals on round-trip flights to London from Seattle-Tacoma International, departing today and this week
22 May - 3 Jun
$888pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
     
3 STOPS
LHR
London Heathrow
LHR
London Heathrow
Multiple Airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl
21 May - 11 Sep
$908pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
   
2 STOPS
STN
London Stansted
STN
London Stansted
Multiple Airlines
   
2 STOPS
SEA
Seattle/Tacoma Intl
22 May - 3 Jun
$916pp
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-Tacoma International

The cheapest one-way flights from Seattle-Tacoma International to London
6:45 pm - 7:05 am
Multiple Airlines
1 Stop
28h 20m
SEA - LHR
Multiple Airlines
$356
Kiwi.com
4:40 am - 5:05 pm
Multiple Airlines
2 Stops
28h 25m
SEA - LTN
Multiple Airlines
$337
Kiwi.com
3:37 pm - 5:00 am
Multiple Airlines
2 Stops
53h 23m
SEA - LGW
Multiple Airlines
$338
Kiwi.com

Related info for your journey

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

Flight FAQs

From Seattle-Tacoma International 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 6 flights from Seattle/Tacoma Intl to London per day from 19 different airlines.

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

Yes, there are multiple flights from Seattle-Tacoma International to London for under $700. The cheapest flight booked recently is on Multiple Airlines for just $631, but on average you can expect to pay $643.

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

Cheapflights has at least 20 direct flights from Seattle-Tacoma International to London under $900. A good price for a nonstop flight from Seattle-Tacoma International to London is less than $886.

Are there last-minute flights available from Seattle-Tacoma International to London for under $900?

There are currently 20+ open flights from Seattle-Tacoma International to London within the next 7 days for less than $900.

What days are nonstop flights available from Seattle to London?

Nonstop flights can be found on the following days: Sunday, Saturday.

How many flights depart from Seattle-Tacoma International to London on average per day?

Per day, 3 flights depart from Seattle/Tacoma Intl to London on average.
Evening (6pm - Midnight) - 100% of flight departures

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-Tacoma International to London?

For as low as $638, Icelandair can have you in London from Seattle-Tacoma International in 12h 05m. The distance between Seattle-Tacoma International and London is about 4812 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

Our cheapest airline available from Seattle-Tacoma International to London is Icelandair. Our recent data shows that you can find tickets from as low as $636 on this airline. An additional option worth looking into is Aer Lingus, starting at $661.

Destination information for London

Things to know before you go - useful duration and weather info for your trip from Seattle-Tacoma International to London.
Today's exchange rate
$1 = £0.72
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-Tacoma International to London

The chart below displays the airlines Cheapflights users traveling from Seattle-Tacoma International 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-Tacoma International to London

See what time of day planes typically take off from Seattle-Tacoma International 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-Tacoma International to London
See how many times per day planes take to the skies headed from Seattle-Tacoma International to London.
Sunday
4 daily flights
Monday
3 daily flights
Tuesday
8 daily flights
Wednesday
6 daily flights
Thursday
8 daily flights
Friday
6 daily flights
Saturday
8 daily flights
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