UA1187
UA1187 (United Airlines) is a multi-stop service on 8 routes, busiest Boston to San Francisco. Of 691 departures recorded from October 2024 to July 2026, 77.8% left on time, according to the US BTS.
- On-time departures77.8%of 691 flights
- Average delay15.2 min
- July 202630
- Cancelled1.2%
- Legs flown under this number8
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 37 | 31 | ▼ 16.2% |
| February | 44 | 19 | ▼ 56.8% |
| March | 36 | 28 | ▼ 22.2% |
| April | 30 | 30 | 0.0% |
| May | 31 | 28 | ▼ 9.7% |
| June | 25 | 26 | ▲ 4.0% |
| July | – | 30 | – |
| August | 14 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 31 | – | – |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Months without data are left blank.
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 89.2% | 77.4% | ▼ 13.2% |
| February | 77.3% | 72.2% | ▼ 6.5% |
| March | 77.8% | 59.3% | ▼ 23.8% |
| April | 96.7% | 76.7% | ▼ 20.7% |
| May | 83.3% | 74.1% | ▼ 11.1% |
| June | 84.0% | 53.9% | ▼ 35.9% |
| July | – | 46.2% | – |
| August | 78.6% | – | – |
| September | 86.7% | – | – |
| October | 90.3% | – | in progress |
| November | 76.7% | – | – |
| December | 64.5% | – | – |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 1 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 1 | 1 | 0.0% |
| June | 0 | 0 | – |
| July | – | 4 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 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 98.8% 683
- Cancelled 1.2% 8
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BOS SFO Boston Logan International Airport – San Francisco International Airport | 4,341 | 14.3 min | 81.2% | 197 |
| DJT EWR President Donald J. Trump International Airport – Newark Liberty International Airport | 1,650 | 27.9 min | 61.5% | 150 |
| ORD DJT Chicago O'Hare International Airport – President Donald J. Trump International Airport | 1,844 | 14.5 min | 78.6% | 140 |
| SFO PHX San Francisco International Airport – Phoenix Sky Harbor International Airport | 1,047 | 7.2 min | 85.5% | 110 |
| EWR SEA Newark Liberty International Airport – Seattle–Tacoma International Airport | 3,855 | 2.6 min | 83.8% | 37 |
| DEN AUS Denver International Airport – Austin Bergstrom International Airport | 1,249 | 15.6 min | 82.4% | 35 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 40 | 40 | 87.5% | 0 |
| November 2024 | 58 | 58 | 77.6% | 0 |
| December 2024 | 62 | 62 | 82.3% | 0 |
| January 2025 | 37 | 37 | 89.2% | 0 |
| February 2025 | 44 | 44 | 77.3% | 0 |
| March 2025 | 36 | 36 | 77.8% | 0 |
| April 2025 | 30 | 30 | 96.7% | 0 |
| May 2025 | 31 | 30 | 83.3% | 1 |
| June 2025 | 25 | 25 | 84.0% | 0 |
| August 2025 | 14 | 14 | 78.6% | 0 |
| September 2025 | 30 | 30 | 86.7% | 0 |
| October 2025 | 31 | 31 | 90.3% | 0 |
| November 2025 | 30 | 30 | 76.7% | 0 |
| December 2025 | 31 | 31 | 64.5% | 0 |
| January 2026 | 31 | 31 | 77.4% | 0 |
| February 2026 | 19 | 18 | 72.2% | 1 |
| March 2026 | 28 | 27 | 59.3% | 1 |
| April 2026 | 30 | 30 | 76.7% | 0 |
| May 2026 | 28 | 27 | 74.1% | 1 |
| June 2026 | 26 | 26 | 53.9% | 0 |
| July 2026 | 30 | 26 | 46.2% | 4 |