Expect long security lines at Heathrow. Ensure all liquids are in one small bag to avoid delays during manual screening.
Round-trip from | $646 (Cheapflightsfares) |
---|---|
One-way from | $532 (Gurufare) |
Popular in | July |
Cheapest in | February |
Average price | $802 |
Good round-trip deal | $668 or less |
Good one-way deal | $621 or less |
Fly from
Fly to
Route
Depart
Return
Price
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Wed 9/10
4:30 pm-6:20 pm
Nonstop9h 50m
Seattle/Tacoma Intl
Sun 9/14
8:20 pm-1:40 pm
Nonstop9h 20m
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Wed 7/9
9:00 am-5:25 pm
1 stop16h 25m
Seattle/Tacoma Intl
Wed 7/16
8:25 pm-2:15 pm
Nonstop9h 50m
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Wed 7/9
6:15 am-11:15 am
1 stop13h 00m
Seattle/Tacoma Intl
Tue 7/22
5:35 pm-11:20 am
Nonstop9h 45m
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Sun 8/31
11:45 am-11:45 am
1 stop32h 00m
Seattle/Tacoma Intl
Mon 9/8
8:25 pm-2:15 pm
Nonstop9h 50m
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Wed 10/1
6:40 am-2:00 pm
1 stop15h 20m
Seattle/Tacoma Intl
Wed 10/29
12:00 pm-4:00 pm
2 stops45h 00m
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Wed 7/9
9:25 pm-11:25 am
1 stop22h 00m
Seattle/Tacoma Intl
Mon 7/21
11:30 pm-11:55 am
1 stop28h 25m
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Mon 8/18
1:10 pm-8:02 pm
1 stop14h 52m
Seattle/Tacoma Intl
Thu 9/11
1:07 pm-12:15 pm
1 stop15h 08m
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Fri 8/22
7:30 am-6:36 pm
2 stops19h 06m
Seattle/Tacoma Intl
Sun 9/14
5:30 am-6:30 am
2 stops17h 00m
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Wed 9/10
8:40 am-7:31 pm
2 stops18h 51m
Seattle/Tacoma Intl
Sun 9/14
5:30 am-6:30 am
2 stops17h 00m
LondonSeattle
LHR - SEA
LHRSEA
London Heathrow
Fri 10/31
7:40 am-2:20 pm
1 stop13h 40m
Seattle/Tacoma Intl
Sat 11/15
8:36 am-10:25 am
2 stops17h 49m
The best time to book flights from London Heathrow Airport to Seattle is 54 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of $238). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of $391). 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 London Heathrow Airport to Seattle is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 12% on airfare.
Travelers seeking maximum savings on their London Heathrow Airport to Seattle flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from LHR to SEA are scheduled on a Monday (22 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (11 on average).
In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.
If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).
Overall
Entertainment
Food
Boarding
Comfort
Crew
Reviews
Kim,May 2025
PIH - SLC
Overall
Entertainment
Food
Boarding
Comfort
Crew
Reviews
Kim,May 2025
PIH - SLC
Overall
Entertainment
Food
Boarding
Comfort
Crew
Reviews
Kim,May 2025
PIH - SLC
Overall
Entertainment
Food
Boarding
Comfort
Crew
Reviews
Kim,May 2025
PIH - SLC
Overall
Entertainment
Food
Boarding
Comfort
Crew
Reviews
Kim,May 2025
PIH - SLC
Overall
Entertainment
Food
Boarding
Comfort
Crew
Reviews
Kim,May 2025
PIH - SLC
Airline | Cheapest | Average | Flexibility | On-time |
---|---|---|---|---|
Cheapest$449 | Average$677 | FlexibilityNo cancel fee | On-time76% | |
Cheapest$560 | Average$763 | FlexibilityNo cancel fee | On-time70% | |
Cheapest$575 | Average$1,001 | FlexibilityNo cancel fee | On-time77% | |
Cheapest$594 | Average$941 | FlexibilityNo cancel fee | On-time72% | |
Cheapest$620 | Average$889 | FlexibilityNo cancel fee | On-time71% | |
Cheapest$632 | Average$887 | FlexibilityNo cancel fee | On-timeN/A |