UA1597
UA1597 (United Airlines) is a multi-stop service on 14 routes, busiest Los Angeles to San Francisco. Of 787 departures recorded from October 2024 to July 2026, 81.2% left on time, according to the US BTS.
- On-time departures81.2%of 787 flights
- Average delay12.7 min
- July 202662▲ 5.1%vs July 2025
- Cancelled0.9%
- Legs flown under this number14
according to the US BTS · Oct 12, 2024 → Jul 31, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 28 | 5 | ▼ 82.1% |
| February | 27 | 17 | ▼ 37.0% |
| March | 45 | 34 | ▼ 24.4% |
| April | 30 | 59 | ▲ 96.7% |
| May | 41 | 42 | ▲ 2.4% |
| June | 49 | 60 | ▲ 22.4% |
| July | 59 | 62 | ▲ 5.1% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 26 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 279 | 279 | 0.0% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 75.0% | 40.0% | ▼ 46.7% |
| February | 88.5% | 88.2% | ▼ 0.2% |
| March | 82.2% | 79.4% | ▼ 3.4% |
| April | 93.3% | 91.5% | ▼ 1.9% |
| May | 80.0% | 78.1% | ▼ 2.4% |
| June | 87.8% | 75.0% | ▼ 14.5% |
| July | 77.2% | 63.9% | ▼ 17.2% |
| August | 80.7% | – | – |
| September | 90.0% | – | – |
| October | 93.6% | – | in progress |
| November | 68.0% | – | – |
| December | 67.7% | – | – |
| Year-to-date average (Jan–Jul) | 83.4% | 73.7% | ▼ 11.6% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 1 | 0 | ▼ 100.0% |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 1 | 1 | 0.0% |
| June | 0 | 0 | – |
| July | 2 | 1 | ▼ 50.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 4 | 2 | ▼ 50.0% |
according to the US BTS · October 2024 → July 2026
This is not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
This number flies several legs
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 99.1% 780
- Cancelled 0.9% 7
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
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| LAX SFO Los Angeles International Airport – San Francisco International Airport | 543 | 6.8 min | 85.4% | 234 |
| CMH SFO John Glenn Columbus International Airport – San Francisco International Airport | 3,403 | 21.1 min | 79.7% | 149 |
| SFO EWR San Francisco International Airport – Newark Liberty International Airport | 4,118 | 35.9 min | 64.8% | 72 |
| DEN RDU Denver International Airport – Raleigh-Durham International Airport | 2,307 | 6.8 min | 82.9% | 70 |
| DAY DEN James M. Cox Dayton International Airport – Denver International Airport | 1,742 | -1.3 min | 91.2% | 68 |
| BUR DEN Hollywood Burbank/Bob Hope Airport – Denver International Airport | 1,366 | 6.8 min | 78.0% | 52 |
| EWR DFW Newark Liberty International Airport – Dallas Fort Worth International Airport | 2,205 | 16.7 min | 64.6% | 49 |
| SFO SEA San Francisco International Airport – Seattle–Tacoma International Airport | 1,093 | 3.3 min | 90.6% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 30 | 30 | 86.7% | 0 |
| December 2024 | 30 | 30 | 93.3% | 0 |
| January 2025 | 28 | 28 | 75.0% | 0 |
| February 2025 | 27 | 26 | 88.5% | 1 |
| March 2025 | 45 | 45 | 82.2% | 0 |
| April 2025 | 30 | 30 | 93.3% | 0 |
| May 2025 | 41 | 40 | 80.0% | 1 |
| June 2025 | 49 | 49 | 87.8% | 0 |
| July 2025 | 59 | 57 | 77.2% | 2 |
| August 2025 | 31 | 31 | 80.7% | 0 |
| September 2025 | 30 | 30 | 90.0% | 0 |
| October 2025 | 31 | 31 | 93.6% | 0 |
| November 2025 | 26 | 25 | 68.0% | 1 |
| December 2025 | 31 | 31 | 67.7% | 0 |
| January 2026 | 5 | 5 | 40.0% | 0 |
| February 2026 | 17 | 17 | 88.2% | 0 |
| March 2026 | 34 | 34 | 79.4% | 0 |
| April 2026 | 59 | 59 | 91.5% | 0 |
| May 2026 | 42 | 41 | 78.1% | 1 |
| June 2026 | 60 | 60 | 75.0% | 0 |
| July 2026 | 62 | 61 | 63.9% | 1 |