UA566
UA566 (United Airlines) is a multi-stop service on 8 routes, busiest San Francisco to Denver. Of 723 departures recorded from October 2024 to July 2026, 82.4% left on time, according to the US BTS.
- On-time departures82.4%of 723 flights
- Average delay9.2 min
- July 202631▼ 49.2%vs July 2025
- Cancelled0.3%
- Legs flown under this number8
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 31 | 27 | ▼ 12.9% |
| February | 28 | 28 | 0.0% |
| March | 31 | 30 | ▼ 3.2% |
| April | 30 | 28 | ▼ 6.7% |
| May | 52 | 31 | ▼ 40.4% |
| June | 35 | 30 | ▼ 14.3% |
| July | 61 | 31 | ▼ 49.2% |
| August | 49 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 29 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 268 | 205 | ▼ 23.5% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 87.1% | 92.6% | ▲ 6.3% |
| February | 89.3% | 89.3% | 0.0% |
| March | 74.2% | 90.0% | ▲ 21.3% |
| April | 86.7% | 92.9% | ▲ 7.1% |
| May | 82.7% | 93.6% | ▲ 13.1% |
| June | 80.0% | 90.0% | ▲ 12.5% |
| July | 65.0% | 64.5% | ▼ 0.7% |
| August | 69.4% | – | – |
| September | 80.0% | – | – |
| October | 90.3% | – | in progress |
| November | 96.6% | – | – |
| December | 96.7% | – | – |
| Year-to-date average (Jan–Jul) | 80.7% | 87.5% | ▲ 8.5% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 1 | 0 | ▼ 100.0% |
according to the US BTS · October 2024 → July 2026
This is a historical record of departures already flown, not a forecast for your flight.
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 99.7% 721
- Cancelled 0.3% 2
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SFO DEN San Francisco International Airport – Denver International Airport | 1,553 | 13.8 min | 78.0% | 346 |
| SMF DEN Sacramento International Airport – Denver International Airport | 1,460 | 2.3 min | 89.6% | 278 |
| SBA SFO Santa Barbara Municipal Airport – San Francisco International Airport | 422 | 11.5 min | 71.7% | 54 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 95.0% | 0 |
| November 2024 | 29 | 29 | 65.5% | 0 |
| December 2024 | 31 | 31 | 74.2% | 0 |
| January 2025 | 31 | 31 | 87.1% | 0 |
| February 2025 | 28 | 28 | 89.3% | 0 |
| March 2025 | 31 | 31 | 74.2% | 0 |
| April 2025 | 30 | 30 | 86.7% | 0 |
| May 2025 | 52 | 52 | 82.7% | 0 |
| June 2025 | 35 | 35 | 80.0% | 0 |
| July 2025 | 61 | 60 | 65.0% | 1 |
| August 2025 | 49 | 49 | 69.4% | 0 |
| September 2025 | 30 | 30 | 80.0% | 0 |
| October 2025 | 31 | 31 | 90.3% | 0 |
| November 2025 | 29 | 29 | 96.6% | 0 |
| December 2025 | 31 | 30 | 96.7% | 1 |
| January 2026 | 27 | 27 | 92.6% | 0 |
| February 2026 | 28 | 28 | 89.3% | 0 |
| March 2026 | 30 | 30 | 90.0% | 0 |
| April 2026 | 28 | 28 | 92.9% | 0 |
| May 2026 | 31 | 31 | 93.6% | 0 |
| June 2026 | 30 | 30 | 90.0% | 0 |
| July 2026 | 31 | 31 | 64.5% | 0 |