O'Hare International (ORD) to Heathrow (LHR). Served by British Airways, American, United.
| Departure | Return | Price |
|---|---|---|
| 08/04/2026 | 08/12/2026 | $860 |
| 08/02/2026 | 08/11/2026 | $873 |
| 08/04/2026 | 08/11/2026 | $873 |
| 08/04/2026 | 08/13/2026 | $873 |
| 08/03/2026 | 08/12/2026 | $883 |
| 08/05/2026 | 08/12/2026 | $889 |
| 08/05/2026 | 08/13/2026 | $889 |
| 08/05/2026 | 08/14/2026 | $889 |
| 08/03/2026 | 08/11/2026 | $914 |
| 08/05/2026 | 08/11/2026 | $914 |
Based on current fares, August is the cheapest month to fly from Chicago to London, with average fares around $906 round trip (as low as $860).
June tends to be more expensive, averaging $1225.
See the full month-by-month and day-of-week price analysis
Best Time to Fly ORD → LHRDeparture date prices (economy, round trip). Green = cheap, red = expensive.
The cheapest month to fly from Chicago to London is August, with average round-trip fares around $906. Fares in August start as low as $860. The most expensive month is June, averaging $1225.
A nonstop flight from Chicago to London takes approximately 8h.
British Airways, American, and United fly from ORD to LHR. That's 3 airlines serving this route.
The cheapest flight from Chicago to London currently starts at $860 round trip in economy class.
The average round-trip flight price from Chicago to London is $1181 in economy class.
The distance is 3952 miles (6359 km). with a nonstop flight time of about 8h. Airlines on this route include British Airways, American, United. The lowest fare currently available is $860 departing in August. The average round-trip fare is $1181.
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