Compare cheap flights from Chicago to London. Search ORD to LHR fares, airports, airlines and flexible dates.
About this route
Chicago O'Hare has strong nonstop service to London, anchored by United and American, which are both hubs at ORD. Competition is narrower than from New York, so date flexibility and fare family choice matter most.
Chicago airport departure area before a flight to London.
Route at a glance
Route
Chicago to London
Airports
ORD → LHR
Compare
Compare dates, bag rules, and airport transfers before you judge the fare.
Route verdict
For Chicago to London, the best result is usually the one that balances schedule quality with the all-in fare after bags and transfers. Use the first Chicago to London search as a benchmark, then test nearby dates before judging the route as expensive. Airport changes should stay secondary unless the transfer still supports the trip you want. Once the fare looks fair, use the London destination guide to confirm the arrival plan.
Route rhythm
Chicago (ORD) to London (LHR) is about 3,940 miles (6,340 km). Nonstop flights take about 7.5 to 8 hours eastbound and around 9 hours back, depending on winds and routing.
Timing
January to March and November, outside the holidays, are usually cheapest. Summer and Christmas are peak times.
Airlines
These carriers have commonly served the route. Schedules change by season, so confirm current options in the live results.
London, the destination for this route.
Fare range
With fewer carriers, sales from United or the American and British Airways joint business can move the whole market. Setting a fare alert works well here. Compare one-stop options via Dublin or Reykjavik only if the saving is large.
Airport choice
On the Chicago side:
On the London side:
Destination fit
From Heathrow, the Elizabeth line and Heathrow Express reach central London in under an hour.
Keep exploring
Related route
Compare a nearby city pair before you commit to one exact itinerary.
Related route
Compare a nearby city pair before you commit to one exact itinerary.
Related route
Compare a nearby city pair before you commit to one exact itinerary.
Better-value fares
Use the search form above to compare live fares, airlines and dates for Chicago to London.
Start with ORD and LHR, then widen the search only when the ground transfer still makes sense.
On Chicago to London, baggage, seats, and airport transfers can erase the savings from a low headline fare.
Even a one or two day shift can move you into a cheaper pricing band on busy city-break routes.
Nonstop flights often win on convenience, but a short connection is still worth checking before you rule it out.
About 7.5 to 8 hours eastbound and around 9 hours back.