OO4637
OO4637 (SkyWest Airlines) is a multi-stop service on 18 routes, busiest Denver to Tucson. Of 657 departures recorded from October 2024 to July 2026, 85.6% left on time, according to the US BTS.
- On-time departures85.6%of 657 flights
- Average delay8.3 min
- July 202631▲ 0.0%vs July 2025
- Cancelled0.9%
- Legs flown under this number18
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 | 31 | 31 | 0.0% |
| February | 28 | 28 | 0.0% |
| March | 31 | 31 | 0.0% |
| April | 30 | 30 | 0.0% |
| May | 30 | 31 | ▲ 3.3% |
| June | 30 | 30 | 0.0% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 211 | 212 | ▲ 0.5% |
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 | 96.8% | 87.1% | ▼ 10.0% |
| February | 96.4% | 78.6% | ▼ 18.5% |
| March | 93.6% | 93.3% | ▼ 0.2% |
| April | 96.7% | 86.7% | ▼ 10.3% |
| May | 100.0% | 90.3% | ▼ 9.7% |
| June | 64.3% | 83.3% | ▲ 29.6% |
| July | 77.4% | 66.7% | ▼ 13.9% |
| August | 64.5% | – | – |
| September | 70.0% | – | – |
| October | 87.1% | – | in progress |
| November | 100.0% | – | – |
| December | 87.1% | – | – |
| Year-to-date average (Jan–Jul) | 89.3% | 83.7% | ▼ 6.3% |
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 | 0 | – |
| May | 0 | 0 | – |
| June | 2 | 0 | ▼ 100.0% |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 2 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 2 | 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 99.1% 651
- Cancelled 0.9% 6
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 |
|---|---|---|---|---|
| DEN TUS Denver International Airport – Tucson International Airport | 1,029 | 1.3 min | 93.0% | 274 |
| BTR IAH Baton Rouge Metropolitan Airport – George Bush Intercontinental Airport | 407 | 18.5 min | 75.6% | 83 |
| BOI DEN Boise Air Terminal/Gowen Field – Denver International Airport | 1,042 | 18.2 min | 75.0% | 68 |
| ATW ORD Appleton International Airport – Chicago O'Hare International Airport | 258 | 34.0 min | 64.9% | 38 |
| BIL DEN Billings Logan International Airport – Denver International Airport | 733 | 3.0 min | 86.5% | 37 |
| COS ORD City of Colorado Springs Municipal Airport – Chicago O'Hare International Airport | 1,463 | 6.9 min | 88.6% | 35 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 30 | 30 | 80.0% | 0 |
| December 2024 | 31 | 31 | 93.6% | 0 |
| January 2025 | 31 | 31 | 96.8% | 0 |
| February 2025 | 28 | 28 | 96.4% | 0 |
| March 2025 | 31 | 31 | 93.6% | 0 |
| April 2025 | 30 | 30 | 96.7% | 0 |
| May 2025 | 30 | 30 | 100.0% | 0 |
| June 2025 | 30 | 28 | 64.3% | 2 |
| July 2025 | 31 | 31 | 77.4% | 0 |
| August 2025 | 31 | 31 | 64.5% | 0 |
| September 2025 | 30 | 30 | 70.0% | 0 |
| October 2025 | 31 | 31 | 87.1% | 0 |
| November 2025 | 30 | 28 | 100.0% | 2 |
| December 2025 | 31 | 31 | 87.1% | 0 |
| January 2026 | 31 | 31 | 87.1% | 0 |
| February 2026 | 28 | 28 | 78.6% | 0 |
| March 2026 | 31 | 30 | 93.3% | 1 |
| April 2026 | 30 | 30 | 86.7% | 0 |
| May 2026 | 31 | 31 | 90.3% | 0 |
| June 2026 | 30 | 30 | 83.3% | 0 |
| July 2026 | 31 | 30 | 66.7% | 1 |