Use SEA Spot Saver to book security screening appointments in advance, reducing wait times without needing TSA PreCheck or CLEAR.
Round-trip from | $574 (Delta) |
---|---|
One-way from | $220 (Icelandair) |
Popular in | June |
Cheapest in | March |
Average price | $1,017 |
Good round-trip deal | $656 or less |
Good one-way deal | $427 or less |
Fly from
Fly to
Route
Depart
Return
Price
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Sun 8/17
8:25 pm-2:15 pm
Nonstop9h 50m
London Heathrow
Sun 8/24
6:30 pm-8:50 pm
Nonstop10h 20m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Wed 8/13
3:05 pm-2:35 pm
1 stop15h 30m
London Heathrow
Sun 8/24
6:30 pm-8:50 pm
Nonstop10h 20m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Wed 8/27
5:30 am-6:30 am
2 stops17h 00m
London Heathrow
Wed 9/10
8:40 am-7:31 pm
2 stops18h 51m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Tue 9/16
8:20 pm-1:40 pm
Nonstop9h 20m
London Heathrow
Tue 9/23
9:25 am-11:10 am
Nonstop9h 45m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Wed 7/16
7:35 pm-3:55 pm
1 stop12h 20m
London Heathrow
Wed 8/6
1:25 pm-5:50 pm
1 stop12h 25m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Mon 7/7
5:15 am-9:00 am
1 stop19h 45m
London Heathrow
Mon 9/15
7:25 pm-8:09 pm
2 stops32h 44m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Sun 8/24
6:50 pm-8:40 pm
2 stops17h 50m
London Heathrow
Fri 9/12
6:55 am-4:59 pm
1 stop18h 04m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Tue 8/26
10:00 am-7:20 pm
2 stops25h 20m
London Heathrow
Fri 9/5
6:00 am-6:36 pm
2 stops20h 36m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Sun 8/17
7:20 am-10:00 am
1 stop18h 40m
London Heathrow
Mon 8/25
6:50 am-8:42 pm
2 stops21h 52m
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Fri 8/15
1:30 pm-9:50 am
1 stop12h 20m
London Heathrow
Fri 8/22
6:00 pm-8:20 pm
Nonstop10h 20m
Booking 32 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to London Heathrow Airport. 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 Heathrow Airport (average of $661). Flying from Seattle to London Heathrow Airport in June is currently the most expensive (average of $1,098). 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.
When flying from Seattle to London Heathrow Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 13% versus a flight in the morning.
Travelers seeking maximum savings on their Seattle to London Heathrow Airport flight should consider departing on Monday mornings when fares are most often at their lowest. Thursday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from SEA to LHR are scheduled on a Monday (22 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (16 on average).
Comfort
Food
Overall
Crew
Entertainment
Boarding
Reviews
Kim,May 2025
PIH - SLC
Comfort
Food
Overall
Crew
Entertainment
Boarding
Reviews
Kim,May 2025
PIH - SLC
Comfort
Food
Overall
Crew
Entertainment
Boarding
Reviews
Kim,May 2025
PIH - SLC
Comfort
Food
Overall
Crew
Entertainment
Boarding
Reviews
Kim,May 2025
PIH - SLC
Comfort
Food
Overall
Crew
Entertainment
Boarding
Reviews
Kim,May 2025
PIH - SLC
Comfort
Food
Overall
Crew
Entertainment
Boarding
Reviews
Kim,May 2025
PIH - SLC
Airline | Cheapest | Average | Flexibility | On-time |
---|---|---|---|---|
Cheapest$378 | Average$819 | FlexibilityNo cancel fee | On-time76% | |
Cheapest$498 | Average$870 | FlexibilityNo cancel fee | On-time69% | |
Cheapest$506 | Average$664 | FlexibilityNo cancel fee | On-time76% | |
Cheapest$532 | Average$741 | FlexibilityNo cancel fee | On-time77% | |
Cheapest$556 | Average$725 | FlexibilityNo cancel fee | On-time76% | |
Cheapest$579 | Average$733 | FlexibilityNo cancel fee | On-time77% | |
Cheapest$583 | Average$793 | FlexibilityNo cancel fee | On-timeN/A | |
Cheapest$597 | Average$880 | FlexibilityNo cancel fee | On-time77% | |
Cheapest$597 | Average$825 | FlexibilityNo cancel fee | On-time75% | |
Cheapest$605 | Average$848 | FlexibilityNo cancel fee | On-time70% |