UA1181
UA1181 (United Airlines) is a multi-stop service on 13 routes, busiest Las Vegas to Houston. Of 817 departures recorded from October 2024 to July 2026, 86.0% left on time, according to the US BTS.
- On-time departures86.0%of 817 flights
- Average delay9.1 min
- July 202631▲ 0.0%vs July 2025
- Cancelled1.1%
- Legs flown under this number13
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 | 37 | 36 | ▼ 2.7% |
| February | 28 | 28 | 0.0% |
| March | 20 | 31 | ▲ 55.0% |
| April | 30 | 30 | 0.0% |
| May | 52 | 37 | ▼ 28.8% |
| June | 54 | 30 | ▼ 44.4% |
| July | 31 | 31 | 0.0% |
| August | 45 | – | – |
| September | 36 | – | – |
| October | 62 | – | in progress |
| November | 59 | – | – |
| December | 46 | – | – |
| Year to date (Jan–Jul) | 252 | 223 | ▼ 11.5% |
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 | 68.6% | 97.2% | ▲ 41.8% |
| February | 89.3% | 92.9% | ▲ 4.0% |
| March | 90.0% | 96.8% | ▲ 7.5% |
| April | 100.0% | 86.7% | ▼ 13.3% |
| May | 71.2% | 75.7% | ▲ 6.4% |
| June | 76.5% | 86.2% | ▲ 12.7% |
| July | 100.0% | 93.6% | ▼ 6.5% |
| August | 75.6% | – | – |
| September | 86.1% | – | – |
| October | 85.5% | – | in progress |
| November | 83.1% | – | – |
| December | 100.0% | – | – |
| Year-to-date average (Jan–Jul) | 85.1% | 89.9% | ▲ 5.6% |
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 | 2 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 3 | 1 | ▼ 66.7% |
| July | 2 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 7 | 1 | ▼ 85.7% |
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 98.9% 808
- Cancelled 1.1% 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 |
|---|---|---|---|---|
| LAS IAH Harry Reid International Airport – George Bush Intercontinental Airport | 1,963 | 4.5 min | 93.4% | 430 |
| IAH DFW George Bush Intercontinental Airport – Dallas Fort Worth International Airport | 362 | 23.1 min | 71.3% | 111 |
| IAH DCA George Bush Intercontinental Airport – Ronald Reagan Washington National Airport | 1,942 | 12.4 min | 74.6% | 55 |
| IAH SFO George Bush Intercontinental Airport – San Francisco International Airport | 2,627 | 2.3 min | 94.6% | 37 |
| DEN ORD Denver International Airport – Chicago O'Hare International Airport | 1,426 | 2.5 min | 86.5% | 37 |
| SFO IAH San Francisco International Airport – George Bush Intercontinental Airport | 2,627 | -4.8 min | 100.0% | 32 |
| IAH FLL George Bush Intercontinental Airport – Fort Lauderdale Hollywood International Airport | 1,552 | -0.7 min | 90.3% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 30 | 30 | 96.7% | 0 |
| December 2024 | 44 | 43 | 79.1% | 1 |
| January 2025 | 37 | 35 | 68.6% | 2 |
| February 2025 | 28 | 28 | 89.3% | 0 |
| March 2025 | 20 | 20 | 90.0% | 0 |
| April 2025 | 30 | 30 | 100.0% | 0 |
| May 2025 | 52 | 52 | 71.2% | 0 |
| June 2025 | 54 | 51 | 76.5% | 3 |
| July 2025 | 31 | 29 | 100.0% | 2 |
| August 2025 | 45 | 45 | 75.6% | 0 |
| September 2025 | 36 | 36 | 86.1% | 0 |
| October 2025 | 62 | 62 | 85.5% | 0 |
| November 2025 | 59 | 59 | 83.1% | 0 |
| December 2025 | 46 | 46 | 100.0% | 0 |
| January 2026 | 36 | 36 | 97.2% | 0 |
| February 2026 | 28 | 28 | 92.9% | 0 |
| March 2026 | 31 | 31 | 96.8% | 0 |
| April 2026 | 30 | 30 | 86.7% | 0 |
| May 2026 | 37 | 37 | 75.7% | 0 |
| June 2026 | 30 | 29 | 86.2% | 1 |
| July 2026 | 31 | 31 | 93.6% | 0 |