Cheap Flights from Seattle, WA to London from $193

Return flight: London – Seattle

On Cheapflightsplus.com you will find 15 direct and 989 connecting flights from Seattle to London. You can compare airfare deals from 21 airlines and multiple travel sites from $193, book and save on cheap plane tickets and last minute offers. Also check out SEA-LON flight schedule to find best flight time, convenient departure and arrival airports.

Flight Information

Below we will explain in detail what the flights cost on the destination from Seattle to London depends on and how to choose the most interesting flight option for you.

Distance between Seattle and London is 7714 miles. Time difference between the cities is 8h. Airplanes depart 05:25 to 23:59 from 3 Seattle airports and arrive 05:25 to 23:59 to 10 London airports. Average flight time is 9h 20m.

  • The fastest flight 9h 20m
  • Average flight time 9h 20m
  • The earliest flight 05:25
  • The latest flight 23:59
  • Distance 4794 ml

The cheapest months to travel to London are july (from 193 $), august (from 193 $), october (from 201 $).

The most expensive months are december (from 595 $), february (from 537 $), january (from 481 $).

What is the lowest airfare Seattle to London?

The cheapest plane ticket found by our users is $193. This airfare is for economy class on one-way FI684 flight by Icelandair for July 4, 2025 which leaves Seattle-Tacoma Intl in Seattle at 23:30 am and arrives at London Heathrow at 20:20.

Economy class
$193
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Business class
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First class
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Flight Schedule Seattle (Washington) to London

13:30 — 06:50+1day
9h 20m flight time
Find flight
from$377
Seattle — London
BA52 British Airways
13:30 — 06:50+1day
9h 20m flight time
Find flight
from$384
Seattle — London
IB3508 Iberia
15:45 — 11:45+1day
12h flight time
Find flight
from$193
14:30 — 06:10 Seattle — Reykjavik
FI680 Icelandair
1h 20m stop
07:45 — 10:50 Reykjavik — London
FI470 Icelandair
15:45 — 11:55+1day
12h 10m flight time
Find flight
from$201
15:45 — 06:15 Seattle — Reykjavik
FI680 Icelandair
1h 25m stop
07:40 — 11:55 Reykjavik — London
FI450 Icelandair
15:45 — 20:20+1day
20h 35m flight time
Find flight
from$201
15:45 — 06:15 Seattle — Reykjavik
FI680 Icelandair
9h 55m stop
16:10 — 20:20 Reykjavik — London
FI454 Icelandair
17:35 — 11:20+1day
9h 45m flight time
Find flight
from$401
Seattle — London
AF9905 Air France
17:35 — 11:20+1day
9h 45m flight time
Find flight
from$401
Seattle — London
KL4823 KLM
17:35 — 11:20+1day
9h 45m flight time
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from$467
Seattle — London
VS106 Virgin Atlantic Airways
19:00 — 20:20+1day
17h 20m flight time
Find flight
from$201
19:00 — 09:25 Seattle — Reykjavik
FI682 Icelandair
6h 45m stop
16:10 — 20:20 Reykjavik — London
FI454 Icelandair
19:00 — 11:55+2days
32h 55m flight time
Find flight
from$202
19:00 — 09:25 Seattle — Reykjavik
FI682 Icelandair
22h 15m stop
07:40 — 11:55 Reykjavik — London
FI450 Icelandair
20:20 — 13:40+1day
9h 20m flight time
Find flight
from$377
Seattle — London
BA48 British Airways
20:25 — 14:15+1day
9h 50m flight time
Find flight
from$401
Seattle — London
KL6021 KLM
20:25 — 14:15+1day
9h 50m flight time
Find flight
from$401
Seattle — London
AF3603 Air France
23:30 — 20:20+1day
12h 50m flight time
Find flight
from$193
23:30 — 14:00 Seattle — Reykjavik
FI684 Icelandair
2h 10m stop
16:10 — 20:20 Reykjavik — London
FI454 Icelandair
23:30 — 11:55+2days
28h 25m flight time
Find flight
from$194
23:30 — 14:00 Seattle — Reykjavik
FI684 Icelandair
17h 40m stop
07:40 — 11:55 Reykjavik — London
FI450 Icelandair
Full flight schedule will help you in detecting at what time planes fly from Seattle to London. You can also specify the concrete flights and airlines on the route and how long the flight actually is. Use the calendar for today, tomorrow or other specific date as some flights are available only on certain days of the week.
*Departure and arrival times - local. Updated on October 6, 2025.

Popular Airlines on the Route

The flight Seattle — London is served by 21 regular airline and 4 low-cost airlines. Most of the flights on this route are operated by KLM - 19 departures per week at the price of from $ 401 . And the most expensive tickets are offered by WestJet airline - from $ 1005.

Direct flights

There are 15 nonstop flights on the route. The fastest direct flight is BA52 by British Airways takes 9h 20m and the cheapest is FI684 by Icelandair for $377.

  • KL - KLM
    from $401
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  • AS - Alaska Airlines
    from $510
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  • EI - Aer Lingus
    from $857
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  • AF - Air France
    from $401
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  • AY - Finnair
    from $566
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  • IB - Iberia
    from $384
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  • VS - Virgin Atlantic Airways
    from $467
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  • BA - British Airways
    from $377
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See more direct flights

Connecting Flights

There are 989 flights with layovers on the route. The fastest connecting flight is FI682 by Icelandair takes 11h 35m and the cheapest is FI684 by Icelandair for $193.

  • KL - KLM
    from $401
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  • AC - Air Canada
    from $382
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  • FI - Icelandair
    from $193
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  • EI - Aer Lingus
    from $473
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  • OS - Austrian Airlines
    from $500
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  • AF - Air France
    from $401
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  • SY - Sun Country Airlines
    from $312
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  • UA - United Airlines
    from $409
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  • LX - SWISS International Air Lines
    from $422
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  • AS - Alaska Airlines
    from $264
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  • F9 - Frontier Airlines
    from $288
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  • SK - SAS
    from $368
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See more connecting flights

Airports

You can fly from Seattle to London from 3 airports (Boeing Field International Airport, Seattle-Tacoma Intl, Kenmore Air Harbor SPB).

Seattle airports

  • Boeing Field International Airport-BFI
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  • Seattle-Tacoma Intl-SEA
    from $193
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  • Kenmore Air Harbor SPB-LKE
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London airports

  • London City-LCY
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  • London-Waterloo-QQW
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  • Heathrow-LHR
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  • Luton-LTN
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  • British Rail Terminal-ZLX
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  • London Biggin Hill-BQH
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  • Stansted-STN
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  • Gatwick-LGW
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  • Ebbsfleet International Rail St-XQE
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  • Stratford International Rail St-XOF
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How to book a plane 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 flight ticket.
  • 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.

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