Plan to arrive at SEA at least two hours before your flight due to potentially long security lines.
Round-trip from | $504 (Mytrip) |
---|---|
One-way from | $243 (Kiwi.com) |
Popular in | June |
Cheapest in | October |
Average price | $685 |
Good round-trip deal | $597 or less |
Good one-way deal | $452 or less |
Fly from
Fly to
Route
Depart
Return
Price
SeattleLondon
SEA - LGW
SEALGW
Seattle/Tacoma Intl
Sun 9/7
11:30 pm-2:35 pm
1 stop31h 05m
London Gatwick
Tue 9/23
3:40 pm-8:40 pm
1 stop13h 00m
SeattleLondon
SEA - LGW
SEALGW
Seattle/Tacoma Intl
Fri 9/5
7:00 pm-2:40 pm
1 stop11h 40m
London Gatwick
Tue 9/23
3:40 pm-8:40 pm
1 stop13h 00m
SeattleLondon
SEA - STN
SEASTN
Seattle/Tacoma Intl
Wed 10/29
9:05 pm-7:35 pm
1 stop15h 30m
London Stansted
Wed 11/5
8:30 am-6:20 pm
1 stop17h 50m
SeattleLondon
SEA - LGW
SEALGW
Seattle/Tacoma Intl
Wed 9/10
11:30 pm-2:40 pm
1 stop31h 10m
London Gatwick
Thu 9/25
3:40 pm-8:40 pm
1 stop13h 00m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Tue 10/7
8:25 pm-2:15 pm
Nonstop9h 50m
London Heathrow
Wed 10/15
11:30 am-5:40 pm
1 stop14h 10m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Sun 9/14
5:35 pm-11:20 am
Nonstop9h 45m
London Heathrow
Wed 9/24
6:15 am-5:40 pm
1 stop19h 25m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Wed 10/22
5:35 pm-11:20 am
Nonstop9h 45m
London Heathrow
Wed 10/29
6:20 am-2:20 pm
1 stop15h 00m
SeattleLondon
SEA - LGW
SEALGW
Seattle/Tacoma Intl
Tue 9/9
7:00 pm-2:40 pm
1 stop11h 40m
London Gatwick
Thu 9/18
3:40 pm-8:40 pm
1 stop13h 00m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Sun 9/14
5:35 pm-11:20 am
Nonstop9h 45m
London Heathrow
Thu 9/25
6:15 am-5:40 pm
1 stop19h 25m
SeattleLondon
SEA - LGW
SEALGW
Seattle/Tacoma Intl
Tue 9/9
7:00 pm-2:40 pm
1 stop11h 40m
London Gatwick
Tue 9/16
3:40 pm-8:40 pm
1 stop13h 00m
Booking 50 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to London. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Currently, November is the cheapest month in which you can book a flight from Seattle to London (average of $661). Flying from Seattle to London in June is currently the most expensive (average of $1,097). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
One of the essential ways to save on airfare from Seattle to London is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 14% on airfare.
Travelers seeking maximum savings on their Seattle to London flight should consider departing on Tuesday at noon when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from SEA to LON are scheduled on a Wednesday (25 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (15 on average).
Reykjavik (KEF) – chosen by Cheapflights users on 83% of 1-stop itineraries from Seattle to London on Cheapflights.
Reykjavik (KEF) is the most affordable 1-stop option, with an average round-trip price of $575.
Flights via Dublin (DUB) have the shortest average one-way travel time for 1-stop routes: 11h 35m.
Flights via Dublin (DUB) offer the fastest connection on this route, with an average layover time of 2h 03m.
Overall
Crew
Entertainment
Comfort
Boarding
Food
Reviews
Kim,May 2025
PIH - SLC
Overall
Crew
Entertainment
Comfort
Boarding
Food
Reviews
Kim,May 2025
PIH - SLC
Overall
Crew
Entertainment
Comfort
Boarding
Food
Reviews
Kim,May 2025
PIH - SLC
Overall
Crew
Entertainment
Comfort
Boarding
Food
Reviews
Kim,May 2025
PIH - SLC
Overall
Crew
Entertainment
Comfort
Boarding
Food
Reviews
Kim,May 2025
PIH - SLC
Overall
Crew
Entertainment
Comfort
Boarding
Food
Reviews
Kim,May 2025
PIH - SLC
Airline | Cheapest | Average | Flexibility | On-time |
---|---|---|---|---|
Cheapest$378 | Average$865 | FlexibilityNo cancel fee | On-time76% | |
Cheapest$497 | Average$656 | FlexibilityNo cancel fee | On-time76% | |
Cheapest$532 | Average$871 | FlexibilityNo cancel fee | On-time77% | |
Cheapest$532 | Average$845 | FlexibilityNo cancel fee | On-time77% | |
Cheapest$547 | Average$870 | FlexibilityNo cancel fee | On-time69% | |
Cheapest$556 | Average$729 | FlexibilityNo cancel fee | On-time76% | |
Cheapest$564 | Average$816 | FlexibilityNo cancel fee | On-time70% | |
Cheapest$574 | Average$849 | FlexibilityNo cancel fee | On-timeN/A | |
Cheapest$576 | Average$816 | FlexibilityNo cancel fee | On-timeN/A | |
Cheapest$578 | Average$732 | FlexibilityNo cancel fee | On-time77% |