
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $747 (CrystalTravel) |
One-way from | $437 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $710 |
Good round-trip deal | $972 or less |
Good one-way deal | $516 or less |
Fly from
Fly to
Route
Depart
Return
SeattleLondon
SEA - LTN
SEALTN
Seattle/Tacoma Intl
mar. 5/26
3:40 pm-12:55 pm
1 stop13h 15m
London Luton
mié. 6/3
6:15 am-11:45 am
1 stop13h 30m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
mié. 9/9
11:25 pm-8:20 pm
1 stop12h 55m
London Heathrow
mar. 9/15
1:05 pm-8:40 pm
1 stop15h 35m
SeattleLondon
SEA - LTN
SEALTN
Seattle/Tacoma Intl
mar. 10/13
3:40 pm-8:30 pm
3 stops20h 50m
London Luton
mar. 10/20
9:40 am-9:40 am
2 stops32h 00m
SeattleLondon
SEA - LGW
SEALGW
Seattle/Tacoma Intl
lun. 9/14
6:10 pm-6:50 pm
1 stop16h 40m
London Gatwick
dom. 9/20
7:35 pm-4:10 pm
1 stop28h 35m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
mar. 8/18
6:20 pm-12:10 pm
Nonstop9h 50m
London Heathrow
mié. 9/30
6:30 am-11:47 am
1 stop13h 17m
SeattleLondon
SEA - LGW
SEALGW
Seattle/Tacoma Intl
lun. 9/14
6:10 pm-6:50 pm
1 stop16h 40m
London Gatwick
mié. 9/16
3:35 pm-6:48 pm
2 stops35h 13m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
lun. 8/17
6:20 pm-12:10 pm
Nonstop9h 50m
London Heathrow
mar. 8/25
11:40 am-2:00 pm
Nonstop10h 20m
SeattleLondon
SEA - LGW
SEALGW
Seattle/Tacoma Intl
mar. 5/26
6:05 pm-6:50 pm
1 stop16h 45m
London Gatwick
sáb. 6/6
10:20 am-4:00 pm
1 stop13h 40m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
mié. 10/7
6:20 pm-12:10 pm
Nonstop9h 50m
London Heathrow
mar. 10/13
5:45 pm-8:14 pm
Nonstop10h 29m
SeattleLondon
SEA - LGW
SEALGW
Seattle/Tacoma Intl
lun. 5/25
6:10 pm-6:50 pm
1 stop16h 40m
London Gatwick
sáb. 6/6
10:20 am-4:00 pm
1 stop13h 40m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
Booking 64 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, January is the cheapest month in which you can book a flight from Seattle to London (average of $320). Flying from Seattle to London in May is currently the most expensive (average of $1,864). 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.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to London as you normally would.
The most flights from SEA to LON are scheduled on a Tuesday (22 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (18 on average).
Reykjavik (KEF) – chosen by Cheapflights users on 84% 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 $508.
Flights via Reykjavik (KEF) have the shortest average one-way travel time for 1-stop routes: 12h 16m.
Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average layover time of 1h 29m.
About 15% of weekly flights between Seattle and London have experienced delays in the past year, with the average delay time being 128 minutes.
Historically, flights departing in the early afternoon are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
Tuesday tends to have the lowest number of delays on this route, whereas Wednesday has historically faced a higher average of delays compared to other days of the week.
Over the last year, Virgin Atlantic have had the lowest number of delays on this route, with just 7% of flights being delayed.
Crew
Boarding
Comfort
Food
Overall
Entertainment
Reviews
Jim,Nov 2025
AVL - ATL
Crew
Boarding
Comfort
Food
Overall
Entertainment
Reviews
Jim,Nov 2025
AVL - ATL
Crew
Boarding
Comfort
Food
Overall
Entertainment
Reviews
Jim,Nov 2025
AVL - ATL
Crew
Boarding
Comfort
Food
Overall
Entertainment
Reviews
Jim,Nov 2025
AVL - ATL
Crew
Boarding
Comfort
Food
Overall
Entertainment
Reviews
Jim,Nov 2025
AVL - ATL
Crew
Boarding
Comfort
Food
Overall
Entertainment
Reviews
Jim,Nov 2025
AVL - ATL
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$481 | Average$628 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$483 | Average$651 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$515 | Average$792 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$526 | Average$721 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$532 | Average$891 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$532 | Average$781 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$547 | Average$842 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$552 | Average$860 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$556 | Average$694 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$567 | Average$830 | FlexibilityNo cancel fee | On-time77% |