Flight from London to Seattle

From Heathrow (LHR), United Kingdom Europe  →  Sea-Tac (SEA), USA North America

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.

Time zones & jet lag

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

• London → Manchester
• London → Paris
• London → Brussels
• London → Amsterdam
• London → Dublin
• London → Edinburgh
• London → Frankfurt
• London → Zurich
• London → Milan
• London → Munich
• London → Berlin
• London → Copenhagen

Flights to Seattle

• 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
• Boston → Seattle
• Cancun → Seattle