OO4901
OO4901 (SkyWest Airlines) is a multi-stop service on 19 routes, busiest Chicago to Madison. Of 513 departures recorded from October 2024 to June 2026, 77.8% left on time, according to the US BTS.
- On-time departures77.8%of 513 flights
- Average delay20.1 min
- June 20261▼ 96.0%vs June 2025
- Cancelled2.7%
- Legs flown under this number19
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 46 | 27 | ▼ 41.3% |
| February | 36 | 10 | ▼ 72.2% |
| March | 11 | 24 | ▲ 118.2% |
| April | 30 | 6 | ▼ 80.0% |
| May | 4 | 1 | ▼ 75.0% |
| June | 25 | 1 | ▼ 96.0% |
| July | 31 | – | – |
| August | 31 | – | – |
| September | 58 | – | – |
| October | 34 | – | in progress |
| November | 28 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jun) | 152 | 69 | ▼ 54.6% |
according to the US BTS · October 2024 → June 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 periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 82.6% | 53.9% | ▼ 34.8% |
| February | 83.3% | 70.0% | ▼ 16.0% |
| March | 66.7% | 79.2% | ▲ 18.7% |
| April | 89.3% | 100.0% | ▲ 12.0% |
| May | 100.0% | 0.0% | ▼ 100.0% |
| June | 96.0% | 100.0% | ▲ 4.2% |
| July | 93.3% | – | – |
| August | 80.7% | – | – |
| September | 73.2% | – | – |
| October | 82.4% | – | in progress |
| November | 76.9% | – | – |
| December | 56.0% | – | – |
| Year-to-date average (Jan–Jun) | 86.3% | 67.2% | ▼ 22.2% |
according to the US BTS · October 2024 → June 2026
Average departure delay by month
according to the US BTS · October 2024 → June 2026
Cancelled departures by month
The most recent periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 1 | – |
| February | 0 | 0 | – |
| March | 2 | 0 | ▼ 100.0% |
| April | 2 | 0 | ▼ 100.0% |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 1 | – | – |
| August | 0 | – | – |
| September | 2 | – | – |
| October | 0 | – | in progress |
| November | 2 | – | – |
| December | 4 | – | – |
| Year to date (Jan–Jun) | 4 | 1 | ▼ 75.0% |
according to the US BTS · October 2024 → June 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 97.3% 499
- Cancelled 2.7% 14
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jun 4, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
10Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 40 | 40 | 77.5% | 0 |
| November 2024 | 10 | 10 | 100.0% | 0 |
| December 2024 | 31 | 31 | 54.8% | 0 |
| January 2025 | 46 | 46 | 82.6% | 0 |
| February 2025 | 36 | 36 | 83.3% | 0 |
| March 2025 | 11 | 9 | 66.7% | 2 |
| April 2025 | 30 | 28 | 89.3% | 2 |
| May 2025 | 4 | 4 | 100.0% | 0 |
| June 2025 | 25 | 25 | 96.0% | 0 |
| July 2025 | 31 | 30 | 93.3% | 1 |
| August 2025 | 31 | 31 | 80.7% | 0 |
| September 2025 | 58 | 56 | 73.2% | 2 |
| October 2025 | 34 | 34 | 82.4% | 0 |
| November 2025 | 28 | 26 | 76.9% | 2 |
| December 2025 | 29 | 25 | 56.0% | 4 |
| January 2026 | 27 | 26 | 53.9% | 1 |
| February 2026 | 10 | 10 | 70.0% | 0 |
| March 2026 | 24 | 24 | 79.2% | 0 |
| April 2026 | 6 | 6 | 100.0% | 0 |
| May 2026 | 1 | 1 | 0.0% | 0 |
| June 2026 | 1 | 1 | 100.0% | 0 |