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ORD to LHR: distance & flight time
Chicago (Chicago O'Hare International Airport) → London (London Heathrow Airport)
3,942 mi
6,344 km · 3,425 nm
8h 12m
estimated nonstop flight time
+6h
time difference · heading northeast
See live ORD→LHR fares Phone-only fares on this route — call free
Flight time details
3,942 miles nonstop takes roughly 8h 12m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 6-hour time gain when reading arrival times on your ticket.
The two airports
- ORD — Chicago O'Hare International Airport · Chicago, United States
- LHR — London Heathrow Airport · London, United Kingdom
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near ORD
- PWK · Chicago Executive Airport9 mi away
- MDW · Chicago Midway International Airport15 mi away
- CGX · Chicago Meigs Airport17 mi away
- DPA · Dupage Airport18 mi away
Near LHR
- LGW · London Gatwick Airport25 mi away
- NHT · RAF Northolt6 mi away
- HYC · Wycombe Air Park18 mi away
- FAB · Farnborough Airport19 mi away
Frequently asked questions
How far is ORD from LHR?
The flight distance from Chicago (ORD) to London (LHR) is 3,942 miles (6,344 km, 3,425 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ORD to LHR?
A nonstop flight takes about 8h 12m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
What is the time difference between Chicago and London?
London is 6 hours ahead of Chicago.
What is the cheapest way to fly from ORD to LHR?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ORD–LHR that never appear on search engines, with no booking fees.