UA1637
UA1637 (United Airlines) is a multi-stop service on 8 routes, busiest Phoenix to Denver. Of 671 departures recorded from October 2024 to July 2026, 81.0% left on time, according to the US BTS.
- On-time departures81.0%of 671 flights
- Average delay11.6 min
- July 202627▼ 6.9%vs July 2025
- Cancelled0.6%
- Legs flown under this number8
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 | 43 | 31 | ▼ 27.9% |
| February | 28 | 28 | 0.0% |
| March | 31 | 26 | ▼ 16.1% |
| April | 21 | 21 | 0.0% |
| May | 25 | 22 | ▼ 12.0% |
| June | 30 | 26 | ▼ 13.3% |
| July | 29 | 27 | ▼ 6.9% |
| August | 26 | – | – |
| September | 23 | – | – |
| October | 28 | – | in progress |
| November | 24 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 207 | 181 | ▼ 12.6% |
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 | 88.4% | 93.6% | ▲ 5.9% |
| February | 92.9% | 85.7% | ▼ 7.7% |
| March | 80.7% | 76.9% | ▼ 4.6% |
| April | 76.2% | 71.4% | ▼ 6.2% |
| May | 76.0% | 86.4% | ▲ 13.6% |
| June | 65.5% | 84.6% | ▲ 29.2% |
| July | 55.2% | 76.0% | ▲ 37.8% |
| August | 76.0% | – | – |
| September | 73.9% | – | – |
| October | 78.6% | – | in progress |
| November | 79.2% | – | – |
| December | 87.1% | – | – |
| Year-to-date average (Jan–Jul) | 76.4% | 82.1% | ▲ 7.4% |
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 | 1 | 0 | ▼ 100.0% |
| July | 0 | 2 | – |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 2 | ▲ 100.0% |
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 99.4% 667
- Cancelled 0.6% 4
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
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| PHX DEN Phoenix Sky Harbor International Airport – Denver International Airport | 968 | 11.5 min | 80.7% | 473 |
| ORD PHX Chicago O'Hare International Airport – Phoenix Sky Harbor International Airport | 2,313 | 20.9 min | 75.0% | 68 |
| MSP EWR Minneapolis–Saint Paul International Airport / Wold–Chamberlain Field – Newark Liberty International Airport | 1,619 | 11.1 min | 81.4% | 61 |
| ORD MSP Chicago O'Hare International Airport – Minneapolis–Saint Paul International Airport / Wold–Chamberlain Field | 537 | 7.5 min | 80.7% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 37 | 37 | 86.5% | 0 |
| November 2024 | 56 | 56 | 76.8% | 0 |
| December 2024 | 58 | 58 | 93.1% | 0 |
| January 2025 | 43 | 43 | 88.4% | 0 |
| February 2025 | 28 | 28 | 92.9% | 0 |
| March 2025 | 31 | 31 | 80.7% | 0 |
| April 2025 | 21 | 21 | 76.2% | 0 |
| May 2025 | 25 | 25 | 76.0% | 0 |
| June 2025 | 30 | 29 | 65.5% | 1 |
| July 2025 | 29 | 29 | 55.2% | 0 |
| August 2025 | 26 | 25 | 76.0% | 1 |
| September 2025 | 23 | 23 | 73.9% | 0 |
| October 2025 | 28 | 28 | 78.6% | 0 |
| November 2025 | 24 | 24 | 79.2% | 0 |
| December 2025 | 31 | 31 | 87.1% | 0 |
| January 2026 | 31 | 31 | 93.6% | 0 |
| February 2026 | 28 | 28 | 85.7% | 0 |
| March 2026 | 26 | 26 | 76.9% | 0 |
| April 2026 | 21 | 21 | 71.4% | 0 |
| May 2026 | 22 | 22 | 86.4% | 0 |
| June 2026 | 26 | 26 | 84.6% | 0 |
| July 2026 | 27 | 25 | 76.0% | 2 |