Direct (non-stop) flights from London (LHR) to SeaTac (SEA)
Find comprehensive flight information, schedules, and booking details for direct flights from London (LHR) to SeaTac (SEA). This popular route is operated by 3 airlines, offering multiple daily departures.• Flight Duration: 9h 00m - 10h 38m (average flight time)• Distance: 4812 miles (7743 km) (air miles between airports)• Daily Flights: 2-4 flights (scheduled departures per day)
London (LHR)
SeaTac (SEA)
FLIGHT TIME
9h 00m - 10h 38m
FLIGHT DISTANCE
4812 miles (7743 km)
10h 0m - 10h 38m
12:20
14:55
4812 miles (7743 km)
March
3 (Show)
21
Flight Schedule
December 2025
Airlines with direct flights from London (LHR) to SeaTac (SEA)
Route Insights
Duration variability: Flight duration on this route can vary based on aircraft type, wind conditions, and airline scheduling. Average duration is 9h 00m - 10h 38m.
Pricing patterns: March typically offers lower prices due to reduced demand outside peak travel seasons.
Best departure times: Peak departure times are 14:00, 12:00, offering more flight options and potentially better connections.
London (LHR) - SeaTac (SEA) flight price statistics
$828
ApproximateThe numbers are average prices found based on user searches for direct flights between the airports. It's calculated from the cheapest prices found per month for a round-trip with 1 adult and can vary depending on the amount of data we have for this particular route.
$557
Jan$549
Feb$500
Mar$542
Apr$2515
May$750
Jun$792
Jul$1079
Aug$642
Sep$754
Oct$596
Nov$659
DecRelated Information
Airports: LHR • SEA Airport
Airlines operating this route: Delta Air Lines (DL), Virgin Atlantic, British Airways
Frequently Asked Questions
How many flights operate from LHR to SEA?
There are 3 direct flights operating from LHR to SEA. Approximately 2-4 flights daily.
Which airlines operate flights from LHR to SEA?
3 airlines operate on this route: Delta Air Lines, Virgin Atlantic, British Airways.
How long is the flight from LHR to SEA?
The flight duration from LHR to SEA is approximately 9h 00m - 10h 38m.
What is the distance from LHR to SEA?
The distance from LHR to SEA is 4812 miles (7743 km).
What is the flight time range for this route?
Flight times on this route range from 10h 0m - 10h 38m.
What are the earliest and latest flight departure times?
The earliest flight departs at 12:20 and the latest flight departs at 14:55.
What is the cheapest month to fly from LHR to SEA?
March is typically the cheapest month to fly on this route.
How many flights operate per week on this route?
Approximately 21 flights operate per week from LHR to SEA.
What types of aircraft operate on this route?
This route is served by Airbus A330-200, Boeing 787-9, Boeing 777-300ER.
What is the average flight price from LHR to SEA?
The average flight price for a round-trip ticket from LHR to SEA is approximately $828 USD. Prices can vary based on booking time, season, and airline.
When is the best time to book flights from LHR to SEA for the lowest prices?
March is typically the cheapest month to fly from LHR to SEA. Booking in advance and avoiding peak travel seasons can help you find better deals.
How many airlines offer flights from LHR to SEA?
3 airlines offer direct flights from LHR to SEA, providing travelers with multiple options for scheduling and pricing.
How far is SEA from LHR?
The distance from LHR to SEA is 4812 miles (7743 km). This is a long-haul flight route.
How long does it take to fly from LHR to SEA?
The flight time from LHR to SEA is approximately 9h 00m - 10h 38m. Actual flight duration may vary based on weather conditions, aircraft type, and routing.