London to San Francisco flights
Flights from London Heathrow (LHR) to San Francisco (SFO) cover 8,616 km. 4,349 flights flew between them in the last 12 months of UK Civil Aviation Authority figures; 79% 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 | 1,864 | 81% | 1.1% | 12 min |
| British Airways | 1,414 | 76% | 0.8% | 13 min |
| Virgin Atlantic Airways | 1,070 | 79% | 0.7% | 11 min |
Month by month
Over the last 12 months, London and San Francisco ran best in March 2026 (87.7% on time) and worst in June 2026 (67.6%).
See the figures
| Month | On time | Cancelled | Flights |
|---|---|---|---|
| August 2025 | 81% | 0.9% | 430 |
| September 2025 | 75% | 1.4% | 414 |
| October 2025 | 84% | 0% | 385 |
| November 2025 | 82% | 0% | 294 |
| December 2025 | 73% | 0.7% | 299 |
| January 2026 | 75% | 0.3% | 300 |
| February 2026 | 84% | 0.7% | 270 |
| March 2026 | 88% | 0.6% | 310 |
| April 2026 | 83% | 3% | 367 |
| May 2026 | 76% | 0% | 434 |
| June 2026 | 68% | 1.9% | 414 |
| July 2026 | 79% | 0.7% | 432 |
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 San Francisco (SFO).
Questions and answers
- How often are flights between London and San Francisco on time?
- 78.6% of 4,349 flights were on time (within 15 minutes) over the last 12 months of UK Civil Aviation Authority figures, and 0.9% were cancelled.
- Which airline is most punctual between London and San Francisco?
- United Airlines, with 80.6% on time. British Airways was the least punctual at 75.7%.
- What is the best month to fly between London and San Francisco?
- Over the last 12 months, London and San Francisco ran best in March 2026 (87.7% on time) and worst in June 2026 (67.6%).
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