Price observed over the last 3 months for a round trip.
Compare all flight tickets and find cheap flights from Seattle to London
The cheapest flights right now
Seattle – London
Outbound – Nov 23, 2026
1 stop
12h 15m KEF
Return – Dec 8, 2026
1 stop
12h 45m KEF
$779
3 days ago
Seattle – London
Outbound – Nov 23, 2026
1 stop
12h 15m KEF
Return – Dec 8, 2026
1 stop
12h 45m KEF
$778
yesterday
Seattle – London
Outbound – Nov 23, 2026
1 stop
12h 15m KEF
Return – Dec 8, 2026
direct
10h 15m $849
3 days ago
Seattle – London
Outbound – Nov 23, 2026
1 stop
12h 15m KEF
Return – Dec 8, 2026
direct
10h 15m $847
yesterday
* Prices are in USD per passenger, including taxes, for a round trip. Prices are based on searches carried out within the last 72 hours. Please note that availability and ticket prices are subject to change and should not be considered as the final price quoted.
Cheapest flight tickets
$565
Average price of a round trip
$742
Average flight ticket price recorded over the last 3 months for a round trip.
Flight duration
9h37
A flight from Seattle to London takes on average 9h37.
Best time
November
According to user searches, the ideal month to go to London is November.
Tips for finding a cheap flight from Seattle to London
Check out our tips for booking your flight to London (United Kingdom) from Seattle (USA) at the cheapest possible price.
Usually, the cheapest month to pick up a ticket on this route is September, with an average flight ticket price of $655 (calculation over the last two years). The most touristic season corresponds to the months of October, November and December.
For the cheapest flights, it is advisable to buy your ticket at least 7 days before the departure date.
The airline offering the cheapest flight tickets is Icelandair. A ticket from the airline Icelandair to London costs on average $724.
The airlines that offer the most flights are Air France, Alaska Airlines and Virgin Atlantic.
Price of flight tickets from Seattle to London
Here is some information and tips to know before booking your flight:
- Flight ticket prices range from $565 to $1032
- The average price of a flight ticket is about $742
- Prices are lowest for stays in the month of September
- The month in which booking a ticket is cheaper is: September
info departure city :
Seattle, USA
airports :
Kenmore Air Harbor Spb. (LKE)
Seattle-Tacoma International Airport (SEA)
Renton Municipal Airport (RNT)
King County International Airport (BFI)
local time :
Seattle is a city in the country USA, the time zone is [[timezone]]. In Seattle, it is currently {fromLocalTime}, the temperature is on average 17°C, with a minimum of 11°C and a maximum of 24°C.
The city of Seattle (SEA) has 4 airport(s): Kenmore Air Harbor Spb., Seattle-Tacoma, Renton and King County
destination info :
London, United Kingdom
airports :
London City Airport (LCY)
London Gatwick Airport (LGW)
London Heathrow Airport (LHR)
London Luton Airport (LTN)
London-Stansted Airport (STN)
local time :
London is in the country United Kingdom, the time zone is [[timezone]]. In London, it is currently {toLocalTime}, the temperature is on average 11°C, with a minimum of 9°C and a maximum of 14°C.
The city of London (LON) has 5 airport(s): London City, London Gatwick, London Heathrow, London Luton and London-Stansted
Useful info about London
What is the least touristic period to go to London?
If you want to visit London during the least touristic period, choose the month of November.
What is the most popular time to travel to London?
In London, the most popular month is October. It is during this period that the prices offered by airlines are also the highest.
When should I book my flight from Seattle to London?
According to our data, it is recommended to book your flight 7 days before your departure. If you book your flight ticket 2 weeks before your departure, you may find a price below average. The cheapest day to book a flight from Seattle to London is Tuesday.
What are the arrival and destination airports when traveling between Seattle and London?
When you leave, you can leave from Seattle-Tacoma, and you will arrive at London Gatwick, London Heathrow, London Luton, London Southend or London-Stansted.
How to reach Seattle airport from the city centre?
The airport Kenmore Air Harbor Spb. is located 3 km, Seattle-Tacoma is located 16 km, Renton is located 16 km or King County is located 8 km from the city centre. You can access it by using public transportation, taking a taxi, or renting a car.
Are there other means of transportation to go from Seattle to London?
Airplane is the only means of transportation listed on Liligo for this journey.
Are there big differences in weather between Seattle and London?
In summer, the average temperature is 18°C in London and 18°C in Seattle. The average rainfall in summer is 63 mm in London and 38 mm in Seattle. In summer, it is warmer in London and it rains less in Seattle. In winter, it is colder in London and it rains more in Seattle.
