Seattle to London Flight Time & Schedules

How Long to Fly from Seattle to London?

Wondering how long to fly from Seattle to London? A nonstop flight from Seattle to London usually takes around 9 hrs 15 mins to 10 hrs. Flight duration can vary depending on weather conditions, wind direction, aircraft type, and the selected route.

Flights from Seattle-Tacoma International Airport (SEA) to London Heathrow Airport (LHR) are generally fastest when booked nonstop. One-stop flights through cities such as Vancouver, Calgary, or Amsterdam can take around 12 to 18 hrs or more.

Seattle and London are in different time zones. London is generally 8 hours ahead of Seattle.

For the quickest journey, compare nonstop Seattle to London flights, departure times, airfares, baggage allowances, and airline services before booking.

Seattle to London Flight Time by Airport

The average Seattle to London flight time depends on your departure airport, arrival airport, airline, aircraft type, weather, wind direction, and flight path. Most nonstop flights from Seattle to London take around 9 hr 15 mins to 10 hr. Current nonstop services operate between Seattle-Tacoma International Airport (SEA) and London Heathrow Airport (LHR).

London Heathrow Airport (LHR) is the main arrival airport for travelers flying nonstop from Seattle. London Gatwick Airport (LGW) and London City Airport (LCY) may also appear in some flight searches, but these are optional choices and generally require connecting flights. Travelers in the northern Seattle area may consider Seattle Paine Field International Airport (PAE), although it does not currently offer nonstop flights to London.

Departure Airport	Arrival Airport	Estimated Flight Time	Travel Tip
Seattle-Tacoma International Airport (SEA)	London Heathrow Airport (LHR)	Around 9 hr 15 mins–10 hr nonstop	Best option for most travelers, with nonstop flight choices and convenient transport links to central London.
Seattle-Tacoma International Airport (SEA)	London Gatwick Airport (LGW)	Usually around 12 hr 30 mins–16 hr+ with one or more stops	Optional London airport. There are generally no nonstop flights from Seattle, so compare connection times before booking.
Seattle-Tacoma International Airport (SEA)	London City Airport (LCY)	Usually around 13 hr–17 hr+ with one or more stops	Optional choice for travelers staying near central London or the business districts. Connecting flights are normally required.
Seattle Paine Field International Airport (PAE)	London airports, including LHR or LGW	Usually around 14 hr–20 hr+ with one or more stops	Optional departure airport for travelers near Everett or north Seattle. It has no nonstop London service, so the total journey may be longer than flying from SEA.

For the quickest journey, flights from Seattle-Tacoma International Airport (SEA) to London Heathrow Airport (LHR) are usually the most practical choice. Gatwick (LGW), London City (LCY), and Paine Field (PAE) are optional alternatives, but travelers should compare connection times, total journey duration, airport location, and fares before booking.

Best Airlines Flying from Seattle to London

British Airways

Delta Air Lines

Virgin Atlantic

Icelandair

What is the Average Flight Time from Seattle to London?

Nonstop flights from Seattle to London run about 9 hours 30 minutes. British Airways, Delta Air Lines operate direct service on this route.

Connecting flights through hub cities add travel time. Routes through major airports typically take 12 to 15 hours including layover.

Compare both nonstop and connecting options when booking. Sometimes the longer itineraries cost $150 to $300 less than direct flights.

London is 8 hours ahead of Seattle. Plan your arrival time carefully to minimize jet lag impact.

Eastbound flights typically depart in the afternoon or evening and arrive the next day. Westbound return flights often land the same calendar day you depart.

Book 6 to 8 weeks ahead for the best fares. Shoulder season months often offer better deals than peak travel periods.

Most Asked Questions About Seattle to London Flight Time

How long is the flight from Seattle to London?

What is the time difference between Seattle and London?

Which airlines fly from Seattle to London?

How far is it from Seattle to London?

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Explore More Flight Times & Routes

Planning beyond this route? Explore more flight times, distances, and travel durations using our tools below.

Start with our Flight Time Calculator to estimate journey times worldwide, or browse average travel times from your departure city using the Seattle Flight Times.