Calculations with different methods
- 3952.811 miles
- 6361.433 kilometers
- 3434.899 nautical miles
Vincenty's formula calculates the distance between latitude/longitude points on the earth’s surface, using an ellipsoidal model of the earth.Haversine formula
- 3941.829 miles
- 6343.759 kilometers
- 3425.356 nautical miles
The haversine formula calculates the distance between latitude/longitude points assuming a spherical earth (great-circle distance).
Estimated flight time from O'Hare International Airport (ORD) to Heathrow Airport (LHR) is 7 hours 59 minutes.
Time difference and current local times
The time difference between Chicago and London is 6 hours. London is 6 hours ahead of Chicago.
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 480 kg (1 059 pounds).
Chicago to London flight map.
Frequent Flyer Miles Calculator
Chicago (ORD) → London (LHR).