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Flights between London (LHR) and Seattle (SEA)

London Heathrow Airport, United Kingdom ↔ Seattle Tacoma International Airport, United States

A direct route between London and Seattle appears in the OpenFlights route network.

This reflects historical scheduled service and may be out of date — it is not a live timetable.

Airlines that have operated this route include:

American Airlines (AA)Air France (AF)Finnair (AY)British Airways (BA)Delta Air Lines (DL)Virgin Atlantic (VS)
Distance
7,702 km
4,786 miles
Est. flight time
10h 8m
great-circle estimate
Time difference
~8h
varies with DST
View this route on the live map →Search fares on Skyscanner ↗

Climate

Typical monthly temperatures in United Kingdom

Jan
7°
12/2
85mm
Feb
7°
12/2
65mm
Mar
10°
15/5
70mm
Apr
13°
18/8
60mm
May
16°
21/11
65mm
Jun
19°
24/14
65mm
Jul
21°
26/16
60mm
Aug
21°
26/16
75mm
Sep
18°
23/13
75mm
Oct
14°
19/9
90mm
Nov
10°
15/5
90mm
Dec
8°
13/3
95mm

Mean °C (high/low below), avg. rainfall mm · country-level monthly normals, not airport-specific.

Typical monthly temperatures in United States

Jan
4°
9/-1
70mm
Feb
6°
11/1
60mm
Mar
11°
16/6
75mm
Apr
17°
22/12
80mm
May
23°
28/18
95mm
Jun
28°
33/23
100mm
Jul
30°
35/25
95mm
Aug
29°
34/24
90mm
Sep
25°
30/20
80mm
Oct
18°
23/13
70mm
Nov
11°
16/6
70mm
Dec
5°
10/0
75mm

Mean °C (high/low below), avg. rainfall mm · country-level monthly normals, not airport-specific.

Travel advisories

United Kingdom: Exercise Increased Caution (US State Dept) ↗United States: Normal precautions (UK FCDO) ↗

Common questions

How far is London from Seattle?

London (LHR) and Seattle (SEA) are around 7,702 km (4,786 miles) apart — an estimated 10h 8m by air. Distances and flight times are great-circle estimates.

Which airlines have operated the LHR–SEA route?

Airlines recorded operating this route in the OpenFlights network include American Airlines, Air France, Finnair, British Airways, Delta Air Lines, Virgin Atlantic. This reflects historical scheduled service and may be out of date.

What is the time difference between London and Seattle?

Time difference ~ 8 hours (varies with daylight-saving).

When is it warmest in United States?

Across United States, the warmest month on average is July, with mean temperatures around 30°C. These are country-level monthly climate normals, not airport-specific.

Are there travel advisories for United Kingdom and United States?

The US State Department currently rates United Kingdom as Exercise Increased Caution; The UK FCDO rates United States as Normal precautions. Check the official sources before you travel.

Distances and flight times are great-circle estimates, not booked block times.