UA1631
UA1631 (United Airlines) is a multi-stop service on 17 routes, busiest Las Vegas to Los Angeles. Of 742 departures recorded from October 2024 to July 2026, 83.8% left on time, according to the US BTS.
- On-time departures83.8%of 742 flights
- Average delay6.3 min
- July 202631▲ 0.0%vs July 2025
- Cancelled0.4%
- Legs flown under this number17
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 | 28 | ▼ 24.3% |
| February | 26 | 28 | ▲ 7.7% |
| March | 22 | 55 | ▲ 150.0% |
| April | 55 | 30 | ▼ 45.5% |
| May | 28 | 31 | ▲ 10.7% |
| June | 29 | 30 | ▲ 3.4% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 228 | 233 | ▲ 2.2% |
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 | 78.4% | 78.6% | ▲ 0.2% |
| February | 92.3% | 89.3% | ▼ 3.3% |
| March | 86.4% | 89.1% | ▲ 3.2% |
| April | 85.5% | 90.0% | ▲ 5.3% |
| May | 92.9% | 96.8% | ▲ 4.2% |
| June | 69.0% | 83.3% | ▲ 20.8% |
| July | 46.7% | 83.3% | ▲ 78.6% |
| August | 67.7% | – | – |
| September | 93.3% | – | – |
| October | 93.6% | – | in progress |
| November | 86.2% | – | – |
| December | 80.7% | – | – |
| Year-to-date average (Jan–Jul) | 78.7% | 87.2% | ▲ 10.8% |
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 | 1 | 0.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 1 | 0.0% |
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 99.6% 739
- Cancelled 0.4% 3
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
8| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| LAS LAX Harry Reid International Airport – Los Angeles International Airport | 380 | 6.7 min | 84.1% | 177 |
| EWR LAS Newark Liberty International Airport – Harry Reid International Airport | 3,576 | 4.5 min | 88.5% | 149 |
| LAX IAD Los Angeles International Airport – Washington Dulles International Airport | 3,674 | 1.4 min | 88.1% | 109 |
| BOS ORD Boston Logan International Airport – Chicago O'Hare International Airport | 1,391 | -2.8 min | 94.6% | 56 |
| SAV ORD Savannah Hilton Head International Airport – Chicago O'Hare International Airport | 1,246 | 31.8 min | 54.7% | 54 |
| LGA DEN LaGuardia Airport – Denver International Airport | 2,600 | 4.1 min | 89.2% | 37 |
| DEN TYS Denver International Airport – McGhee Tyson Airport | 1,866 | -0.4 min | 89.2% | 37 |
| ORD SAN Chicago O'Hare International Airport – San Diego International Airport | 2,768 | 6.8 min | 83.9% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 25 | 25 | 84.0% | 0 |
| November 2024 | 59 | 59 | 89.8% | 0 |
| December 2024 | 44 | 44 | 79.6% | 0 |
| January 2025 | 37 | 37 | 78.4% | 0 |
| February 2025 | 26 | 26 | 92.3% | 0 |
| March 2025 | 22 | 22 | 86.4% | 0 |
| April 2025 | 55 | 55 | 85.5% | 0 |
| May 2025 | 28 | 28 | 92.9% | 0 |
| June 2025 | 29 | 29 | 69.0% | 0 |
| July 2025 | 31 | 30 | 46.7% | 1 |
| August 2025 | 31 | 31 | 67.7% | 0 |
| September 2025 | 30 | 30 | 93.3% | 0 |
| October 2025 | 31 | 31 | 93.6% | 0 |
| November 2025 | 30 | 29 | 86.2% | 1 |
| December 2025 | 31 | 31 | 80.7% | 0 |
| January 2026 | 28 | 28 | 78.6% | 0 |
| February 2026 | 28 | 28 | 89.3% | 0 |
| March 2026 | 55 | 55 | 89.1% | 0 |
| April 2026 | 30 | 30 | 90.0% | 0 |
| May 2026 | 31 | 31 | 96.8% | 0 |
| June 2026 | 30 | 30 | 83.3% | 0 |
| July 2026 | 31 | 30 | 83.3% | 1 |