UA1577
UA1577 (United Airlines) is a multi-stop service on 15 routes, busiest Chicago to San Francisco. Of 1,138 departures recorded from October 2024 to July 2026, 80.7% left on time, according to the US BTS.
- On-time departures80.7%of 1,138 flights
- Average delay14.4 min
- July 202657▲ 83.9%vs July 2025
- Cancelled0.8%
- Legs flown under this number15
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 | 62 | 57 | ▼ 8.1% |
| February | 30 | 66 | ▲ 120.0% |
| March | 41 | 85 | ▲ 107.3% |
| April | 30 | 65 | ▲ 116.7% |
| May | 47 | 90 | ▲ 91.5% |
| June | 73 | 83 | ▲ 13.7% |
| July | 31 | 57 | ▲ 83.9% |
| August | 64 | – | – |
| September | 36 | – | – |
| October | 55 | – | in progress |
| November | 29 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 314 | 503 | ▲ 60.2% |
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 | 90.3% | 79.0% | ▼ 12.6% |
| February | 86.7% | 83.3% | ▼ 3.9% |
| March | 90.2% | 83.5% | ▼ 7.4% |
| April | 76.7% | 84.4% | ▲ 10.1% |
| May | 84.8% | 81.1% | ▼ 4.3% |
| June | 91.7% | 71.1% | ▼ 22.5% |
| July | 65.5% | 68.4% | ▲ 4.4% |
| August | 73.3% | – | – |
| September | 77.8% | – | – |
| October | 76.4% | – | in progress |
| November | 72.4% | – | – |
| December | 64.5% | – | – |
| Year-to-date average (Jan–Jul) | 83.7% | 78.7% | ▼ 6.0% |
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 | 1 | – |
| May | 1 | 0 | ▼ 100.0% |
| June | 1 | 0 | ▼ 100.0% |
| July | 2 | 0 | ▼ 100.0% |
| August | 4 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 4 | 1 | ▼ 75.0% |
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 99.2% 1,129
- Cancelled 0.8% 9
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
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ORD SFO Chicago O'Hare International Airport – San Francisco International Airport | 2,964 | 23.1 min | 75.9% | 568 |
| SFO SAN San Francisco International Airport – San Diego International Airport | 719 | 2.1 min | 86.6% | 135 |
| SFO SEA San Francisco International Airport – Seattle–Tacoma International Airport | 1,093 | 16.9 min | 69.3% | 101 |
| AUS ORD Austin Bergstrom International Airport – Chicago O'Hare International Airport | 1,574 | 4.5 min | 92.5% | 67 |
| DCA ORD Ronald Reagan Washington National Airport – Chicago O'Hare International Airport | 983 | 2.9 min | 93.8% | 64 |
| ATL ORD Hartsfield Jackson Atlanta International Airport – Chicago O'Hare International Airport | 976 | 2.6 min | 88.6% | 35 |
| SFO DTW San Francisco International Airport – Detroit Metropolitan Wayne County Airport | 3,337 | 6.8 min | 82.8% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 29 | 29 | 93.1% | 0 |
| December 2024 | 57 | 57 | 86.0% | 0 |
| January 2025 | 62 | 62 | 90.3% | 0 |
| February 2025 | 30 | 30 | 86.7% | 0 |
| March 2025 | 41 | 41 | 90.2% | 0 |
| April 2025 | 30 | 30 | 76.7% | 0 |
| May 2025 | 47 | 46 | 84.8% | 1 |
| June 2025 | 73 | 72 | 91.7% | 1 |
| July 2025 | 31 | 29 | 65.5% | 2 |
| August 2025 | 64 | 60 | 73.3% | 4 |
| September 2025 | 36 | 36 | 77.8% | 0 |
| October 2025 | 55 | 55 | 76.4% | 0 |
| November 2025 | 29 | 29 | 72.4% | 0 |
| December 2025 | 31 | 31 | 64.5% | 0 |
| January 2026 | 57 | 57 | 79.0% | 0 |
| February 2026 | 66 | 66 | 83.3% | 0 |
| March 2026 | 85 | 85 | 83.5% | 0 |
| April 2026 | 65 | 64 | 84.4% | 1 |
| May 2026 | 90 | 90 | 81.1% | 0 |
| June 2026 | 83 | 83 | 71.1% | 0 |
| July 2026 | 57 | 57 | 68.4% | 0 |