✈ LHR → ORD
8H 18M FROM LONDON TO CHICAGO. JET LAG IS NOW YOUR PERSONALITY.
Flight from London to Chicago
From Heathrow (LHR), United Kingdom Europe → O'Hare (ORD), USA North America
How long is the flight from London to Chicago?
A nonstop flight from London (LHR) to Chicago (ORD) takes about 8 hours 18 minutes, covering a great-circle distance of 3,943 miles (6,345 km). Actual scheduled time varies by airline, routing, and wind — expect ±15 to 30 minutes from this estimate.
Avg flight time
8h 18m
Nonstop, scheduled
Distance
3,943 mi
6,345 km · great-circle
Avg speed
764 km/h
Door-to-door including taxi
Time zones & jet lag
London timezone
UTC+1
Europe/London
Chicago timezone
UTC-5
America/Chicago
Time difference
-6h
6 hours behind
Jet lag (rough)
~4.2d
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.