London to Chicago flights
Flights from London Heathrow (LHR) to Chicago O'Hare (ORD) cover 6,344 km. 5,746 flights flew between them in the last 12 months of UK Civil Aviation Authority figures; 72% were on time across 3 airlines.
Both directions together. On time means within 15 minutes of schedule, counted over every scheduled flight to and from the UK airport, including cancelled ones (the CAA's definition).
Airlines on this route
| Airline | Flights | On time | Cancelled | Average delay |
|---|---|---|---|---|
| United Airlines | 2,149 | 77% | 2% | 19 min |
| American Airlines | 1,847 | 70% | 2.1% | 25 min |
| British Airways | 1,750 | 68% | 2.2% | 18 min |
Month by month
Over the last 12 months, London and Chicago ran best in February 2026 (84.8% on time) and worst in July 2026 (62.9%).
See the figures
| Month | On time | Cancelled | Flights |
|---|---|---|---|
| August 2025 | 65% | 1.6% | 551 |
| September 2025 | 77% | 0.9% | 537 |
| October 2025 | 68% | 1.4% | 506 |
| November 2025 | 70% | 4.1% | 392 |
| December 2025 | 66% | 1.9% | 429 |
| January 2026 | 73% | 2.9% | 409 |
| February 2026 | 85% | 0% | 368 |
| March 2026 | 82% | 2.5% | 435 |
| April 2026 | 79% | 1.2% | 509 |
| May 2026 | 78% | 1.3% | 551 |
| June 2026 | 66% | 1.7% | 533 |
| July 2026 | 63% | 5.7% | 526 |
Source: UK Civil Aviation Authority punctuality statistics, August 2025 to July 2026. Contains UK Civil Aviation Authority data. Figures describe the past and do not predict a future flight.
More about London Heathrow (LHR) and Chicago O'Hare (ORD).
Questions and answers
- How often are flights between London and Chicago on time?
- 72.2% of 5,746 flights were on time (within 15 minutes) over the last 12 months of UK Civil Aviation Authority figures, and 2.1% were cancelled.
- Which airline is most punctual between London and Chicago?
- United Airlines, with 77.2% on time. British Airways was the least punctual at 68.2%.
- What is the best month to fly between London and Chicago?
- Over the last 12 months, London and Chicago ran best in February 2026 (84.8% on time) and worst in July 2026 (62.9%).
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