OO5521
OO5521 (SkyWest Airlines) is a multi-stop service on 7 routes, busiest Chicago to Appleton. Of 669 departures recorded from October 2024 to July 2026, 75.2% left on time, according to the US BTS.
- On-time departures75.2%of 669 flights
- Average delay16.2 min
- July 202631▲ 0.0%vs July 2025
- Cancelled2.2%
- Legs flown under this number7
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 | 32 | 31 | ▼ 3.1% |
| April | 30 | 30 | 0.0% |
| May | 31 | 42 | ▲ 35.5% |
| June | 30 | 54 | ▲ 80.0% |
| July | 31 | 31 | 0.0% |
| August | 30 | – | – |
| September | 10 | – | – |
| October | 30 | – | in progress |
| November | 30 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 213 | 247 | ▲ 16.0% |
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 | 64.5% | 69.0% | ▲ 6.9% |
| February | 75.0% | 75.0% | 0.0% |
| March | 62.5% | 64.3% | ▲ 2.9% |
| April | 86.7% | 72.4% | ▼ 16.5% |
| May | 87.1% | 87.8% | ▲ 0.8% |
| June | 79.3% | 90.7% | ▲ 14.4% |
| July | 48.4% | 76.7% | ▲ 58.4% |
| August | 71.4% | – | – |
| September | 100.0% | – | – |
| October | 80.0% | – | in progress |
| November | 65.5% | – | – |
| December | 64.5% | – | – |
| Year-to-date average (Jan–Jul) | 71.9% | 76.6% | ▲ 6.4% |
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 | 2 | – |
| February | 0 | 0 | – |
| March | 0 | 3 | – |
| April | 0 | 1 | – |
| May | 0 | 1 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 0 | 1 | – |
| August | 2 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 8 | ▲ 700.0% |
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 97.8% 654
- Cancelled 2.2% 15
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 |
|---|---|---|---|---|
| ORD ATW Chicago O'Hare International Airport – Appleton International Airport | 258 | 17.6 min | 73.1% | 307 |
| ORD COU Chicago O'Hare International Airport – Columbia Regional Airport | 507 | 17.9 min | 74.8% | 279 |
| SCE ORD State College Regional Airport – Chicago O'Hare International Airport | 847 | 11.0 min | 88.6% | 35 |
| SDF ORD Louisville Muhammad Ali International Airport – Chicago O'Hare International Airport | 462 | 2.2 min | 80.0% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 19 | 19 | 94.7% | 0 |
| November 2024 | 28 | 27 | 74.1% | 1 |
| December 2024 | 31 | 29 | 72.4% | 2 |
| January 2025 | 31 | 31 | 64.5% | 0 |
| February 2025 | 28 | 28 | 75.0% | 0 |
| March 2025 | 32 | 32 | 62.5% | 0 |
| April 2025 | 30 | 30 | 86.7% | 0 |
| May 2025 | 31 | 31 | 87.1% | 0 |
| June 2025 | 30 | 29 | 79.3% | 1 |
| July 2025 | 31 | 31 | 48.4% | 0 |
| August 2025 | 30 | 28 | 71.4% | 2 |
| September 2025 | 10 | 10 | 100.0% | 0 |
| October 2025 | 30 | 30 | 80.0% | 0 |
| November 2025 | 30 | 29 | 65.5% | 1 |
| December 2025 | 31 | 31 | 64.5% | 0 |
| January 2026 | 31 | 29 | 69.0% | 2 |
| February 2026 | 28 | 28 | 75.0% | 0 |
| March 2026 | 31 | 28 | 64.3% | 3 |
| April 2026 | 30 | 29 | 72.4% | 1 |
| May 2026 | 42 | 41 | 87.8% | 1 |
| June 2026 | 54 | 54 | 90.7% | 0 |
| July 2026 | 31 | 30 | 76.7% | 1 |