UA664
UA664 (United Airlines) is a multi-stop service on 16 routes, busiest Las Vegas to Chicago. Of 1,145 departures recorded from October 2024 to July 2026, 83.4% left on time, according to the US BTS.
- On-time departures83.4%of 1,145 flights
- Average delay11.9 min
- July 202662▲ 1.6%vs July 2025
- Cancelled0.9%
- Legs flown under this number16
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 | 59 | 31 | ▼ 47.5% |
| February | 54 | 45 | ▼ 16.7% |
| March | 60 | 61 | ▲ 1.7% |
| April | 30 | 51 | ▲ 70.0% |
| May | 52 | 62 | ▲ 19.2% |
| June | 35 | 60 | ▲ 71.4% |
| July | 61 | 62 | ▲ 1.6% |
| August | 62 | – | – |
| September | 60 | – | – |
| October | 62 | – | in progress |
| November | 54 | – | – |
| December | 48 | – | – |
| Year to date (Jan–Jul) | 351 | 372 | ▲ 6.0% |
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 | 96.6% | 96.8% | ▲ 0.2% |
| February | 83.3% | 91.1% | ▲ 9.3% |
| March | 81.7% | 80.0% | ▼ 2.0% |
| April | 76.7% | 84.0% | ▲ 9.6% |
| May | 86.5% | 78.7% | ▼ 9.1% |
| June | 94.3% | 69.5% | ▼ 26.3% |
| July | 77.1% | 78.7% | ▲ 2.1% |
| August | 86.0% | – | – |
| September | 63.3% | – | – |
| October | 83.9% | – | in progress |
| November | 74.1% | – | – |
| December | 85.4% | – | – |
| Year-to-date average (Jan–Jul) | 85.2% | 82.7% | ▼ 2.9% |
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 | 1 | – |
| April | 0 | 1 | – |
| May | 0 | 1 | – |
| June | 0 | 1 | – |
| July | 0 | 1 | – |
| August | 5 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 5 |
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 99.1% 1,135
- Cancelled 0.9% 10
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
11Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 32 | 32 | 93.8% | 0 |
| November 2024 | 59 | 59 | 93.2% | 0 |
| December 2024 | 45 | 45 | 97.8% | 0 |
| January 2025 | 59 | 59 | 96.6% | 0 |
| February 2025 | 54 | 54 | 83.3% | 0 |
| March 2025 | 60 | 60 | 81.7% | 0 |
| April 2025 | 30 | 30 | 76.7% | 0 |
| May 2025 | 52 | 52 | 86.5% | 0 |
| June 2025 | 35 | 35 | 94.3% | 0 |
| July 2025 | 61 | 61 | 77.1% | 0 |
| August 2025 | 62 | 57 | 86.0% | 5 |
| September 2025 | 60 | 60 | 63.3% | 0 |
| October 2025 | 62 | 62 | 83.9% | 0 |
| November 2025 | 54 | 54 | 74.1% | 0 |
| December 2025 | 48 | 48 | 85.4% | 0 |
| January 2026 | 31 | 31 | 96.8% | 0 |
| February 2026 | 45 | 45 | 91.1% | 0 |
| March 2026 | 61 | 60 | 80.0% | 1 |
| April 2026 | 51 | 50 | 84.0% | 1 |
| May 2026 | 62 | 61 | 78.7% | 1 |
| June 2026 | 60 | 59 | 69.5% | 1 |
| July 2026 | 62 | 61 | 78.7% | 1 |