✈ LHR → SEA
9H 55M FLIGHT. TWO MOVIES, NO SLEEP, ONE EXISTENTIAL CRISIS.
Flight from London to Seattle
From Heathrow (LHR), United Kingdom Europe → Sea-Tac (SEA), USA North America
↔ Flying the other way? Seattle → London
How long is the flight from London to Seattle?
A nonstop flight from London (LHR) to Seattle (SEA) takes about 9 hours 55 minutes, covering a great-circle distance of 4,786 miles (7,702 km). Actual scheduled time varies by airline, routing, and wind — expect ±15 to 30 minutes from this estimate.
Avg flight time
9h 55m
Nonstop, scheduled
Distance
4,786 mi
7,702 km · great-circle
Avg speed
776 km/h
Door-to-door including taxi
Time zones & jet lag
London timezone
UTC+1
Europe/London
Seattle timezone
UTC-7
America/Los_Angeles
Time difference
-8h
8 hours behind
Jet lag (rough)
~5.6d
Westward — easier
CO₂ footprint per passenger
Economy class, single passenger. Source: DEFRA 2024 averages.
This flight emits roughly 3.6× the CO₂ of an equivalent train trip and 0.9× a car driven alone over the same distance.
Flights from London
Nearest destinations
- London → Manchester
- London → Paris
- London → Brussels
- London → Amsterdam
- London → Dublin
- London → Edinburgh
- London → Frankfurt
- London → Zurich
- London → Milan
- London → Munich
Long-haul from London
- London → Auckland
- London → Sydney
- London → Melbourne
- London → Bali (Denpasar)
- London → Santiago
- London → Buenos Aires
- London → Singapore
- London → Manila
- London → Kuala Lumpur
- London → Taipei
More flights to North America
Flights to Seattle
Nearest origins
- Vancouver → Seattle
- San Francisco → Seattle
- Las Vegas → Seattle
- Los Angeles → Seattle
- Dallas → Seattle
- Chicago → Seattle
- Toronto → Seattle
- Atlanta → Seattle
- Mexico City → Seattle
- New York → Seattle
Long-haul to Seattle
- Johannesburg → Seattle
- Cape Town → Seattle
- Nairobi → Seattle
- Melbourne → Seattle
- Bali (Denpasar) → Seattle
- Kuala Lumpur → Seattle
- Singapore → Seattle
- Sydney → Seattle
- Mumbai → Seattle
- Abu Dhabi → Seattle