United Airlines London to Seattle Flights

Return flight: Seattle – London
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Best Airfare Price Calendar Flights Schedule

Cheapflightsplus.com will find cheap United Airlines flights from London to Seattle. Compare airline ticket prices and book air tickets starting from $834 from trusted online travel agencies, web sites and directly from airlines. Check flights schedule of United Airlines, arrivals and departure details below.

Find Cheap Airfare London — Seattle (WA) by United Airlines

To find cheap tickets choose a day of your departure with attractive price on the graph below and click «Find flights». For round trip flights please click «Check prices for return flight». The cheapest airfare is in february: one-way - $834, two-way – $1430.
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Cheap Flights from London to Seattle by United Airlines

Look at the list of plane tickets for the most connecting flights by United Airlines, their prices start from $834. There’re no direct flights. The fastest connecting flight – 13h 25m.
Price Departure Arrival Flight Time Airline Flight
from $834
Find flight
6:30 am
London
Heathrow
 12:10 pm
Seattle
Seattle-Tacoma Intl
 13h 40m
layover
1h 15m - Frankfurt
 United Airlines
UA9546
UA8717
from $835
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1:00 pm
London
Heathrow
 6:25 pm
Seattle
Seattle-Tacoma Intl
 13h 25m
layover
2h 35m - Vancouver
 United Airlines
UA8581
UA8249
from $847
Find flight
7:40 am
London
Heathrow
 1:20 pm
Seattle
Seattle-Tacoma Intl
 13h 40m
layover
1h 10m - Munich
 United Airlines
UA8884
UA9414
from $1629
Find flight
11:10 am
London
Heathrow
 9:30 pm
Seattle
Seattle-Tacoma Intl
 18h 20m
layover
4h 40m - Toronto
 United Airlines
UA8203
UA8525
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*Departure and arrival times are local. Prices are for one-way flights. Information refreshed on 01/22/2025
Below is a detailed 2025 flight schedule for today, tomorrow and all other days. It may vary depending on season and a day of the week of your desired trip. We recommend booking your itinerary at least 2 weeks prior your travel to get the best price and availability by the airline.
Departure Arrival Flight Details Flight Time Price
11:10 am — 9:30 pm
11:10 am — 2:25 pm UA8203 United Airlines
London — Toronto
4h 40m stop
7:05 pm — 9:30 pm UA8525 United Airlines
Toronto — Seattle
18h 20m
including layover
Find flight
from$1629
1:00 pm — 6:25 pm
1:00 pm — 2:50 pm UA8581 United Airlines
London — Vancouver
2h 35m stop
5:25 pm — 6:32 pm UA8249 United Airlines
Vancouver — Seattle
13h 25m
including layover
Find flight
from$835
6:30 am — 12:10 pm
6:30 am — 9:05 am UA9546 United Airlines
London — Frankfurt
1h 15m stop
10:20 am — 12:10 pm UA8717 United Airlines
Frankfurt — Seattle
13h 40m
including layover
Find flight
from$834
7:40 am — 1:20 pm
7:40 am — 10:30 am UA8884 United Airlines
London — Munich
1h 10m stop
11:40 am — 1:20 pm UA9414 United Airlines
Munich — Seattle
13h 40m
including layover
Find flight
from$847
*Departure and arrival times are local. Last updated on 01/22/2025

Flight Information

There are 5 flights by United Airlines from London to Seattle every week with departures from Gatwick, London City, Heathrow, Luton, Stansted, Stratford International Rail St, Ebbsfleet International Rail St, London Biggin Hill, London-Waterloo, British Rail Terminal. All flights arrive at Seattle-Tacoma Intl, Boeing Field International Airport, Kenmore Air Harbor SPB.

Departures start from 11:10 am to 7:40 am. Nonstop flight is 13h 25m. The time difference between London and Seattle is 8h.

  • The fastest flight 13h 25m
  • Average flight time 13h 40m
  • The earliest flight 11:10 am
  • The latest flight 7:40 am
  • Distance 4794 ml

The cheapest months for traveling to Seattle are november (from 791 $), december (from 806 $), january (from 824 $).

The most expensive and popular months are february (from 834 $), january (from 824 $), december (from 806 $).

The cheapest flight by United Airlines that our users were able to find is $834. This airfare is economy class on one-way UA9546 flight for February 1, 2025 leaving Heathrow in London at 6:30 am, it includes all taxes and additional fees.

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United Airlines Airplanes on the Route

List of the most popular United Airlines airplanes flying from London to Seattle:

Other Popular Airlines on the Route

Besides United Airlines there are other 32 airline carriers between London and Seattle. Please review schedules and prices from the most popular airlines to find the best airfare deals from London to Seattle.

Nonstop flights

There are 7 direct flights every day from London. Airlines and fares are below:

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Connecting Flights

List of flights with layovers (1 and more stops):

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How to book an air ticket yourself?

How to book an air ticket yourself?
  • Fill in the search parameters — cities of departure and destination, departure and return dates and click «Find flights»
  • Select the best flight that you like. Please, check the airports of departure and arrival. Select the best fare, but pay attention to the following flight details - airports of departure and arrival, flight duration and layovers. Please use filters and sort to find the best flight.
  • Click «Buy» when you are ready — our system will redirect you to the site that sells the selected airfare.
  • Fill in all passenger and payment information — passport and contact information, please double check all passengers’ names and make a payment for your itinerary.
  • That's it — you will receive an email with your e-ticket usually within 10 minutes after your flight is confirmed. Please, print the e-ticket and have it with you at the airport. You would need to have only a passport and/or a required form of ID to travel. Please, check your Visa requirements if you travel outside of the United States or Canada.

    To find a plane ticket, please select dates.

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