YX4603
YX4603 (Republic Airways) is a multi-stop service on 5 routes, busiest Chicago to Louisville. Of 553 departures recorded from October 2024 to July 2026, 75.0% left on time, according to the US BTS.
- On-time departures75.0%of 553 flights
- Average delay16.3 min
- July 202631▲ 0.0%vs July 2025
- Cancelled3.8%
- Legs flown under this number5
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 30 | 27 | ▼ 10.0% |
| February | 28 | 27 | ▼ 3.6% |
| March | 31 | 24 | ▼ 22.6% |
| April | 3 | 28 | ▲ 833.3% |
| May | – | 31 | – |
| June | 26 | 30 | ▲ 15.4% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 29 | – | – |
| December | 28 | – | – |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Months without data are left blank.
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 | 86.2% | 61.5% | ▼ 28.6% |
| February | 82.1% | 72.0% | ▼ 12.3% |
| March | 80.0% | 81.8% | ▲ 2.3% |
| April | 50.0% | 85.7% | ▲ 71.4% |
| May | – | 87.1% | – |
| June | 69.2% | 64.3% | ▼ 7.1% |
| July | 50.0% | 75.9% | ▲ 51.7% |
| August | 65.5% | – | – |
| September | 80.0% | – | – |
| October | 71.0% | – | in progress |
| November | 73.1% | – | – |
| December | 66.7% | – | – |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 1 | 0.0% |
| February | 0 | 2 | – |
| March | 1 | 2 | ▲ 100.0% |
| April | 1 | 0 | ▼ 100.0% |
| May | – | 0 | – |
| June | 0 | 2 | – |
| July | 3 | 2 | ▼ 33.3% |
| August | 2 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 3 | – | – |
| December | 1 | – | – |
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 96.2% 532
- Cancelled 3.8% 21
Share of all recorded flights in the period, all legs. · Oct 15, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
2| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ORD SDF Chicago O'Hare International Airport – Louisville Muhammad Ali International Airport | 462 | 18.1 min | 73.7% | 461 |
| BUF LGA Buffalo Niagara International Airport – LaGuardia Airport | 469 | 0.4 min | 86.4% | 44 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 3 | 3 | 66.7% | 0 |
| November 2024 | 26 | 26 | 92.3% | 0 |
| December 2024 | 28 | 28 | 82.1% | 0 |
| January 2025 | 30 | 29 | 86.2% | 1 |
| February 2025 | 28 | 28 | 82.1% | 0 |
| March 2025 | 31 | 30 | 80.0% | 1 |
| April 2025 | 3 | 2 | 50.0% | 1 |
| June 2025 | 26 | 26 | 69.2% | 0 |
| July 2025 | 31 | 28 | 50.0% | 3 |
| August 2025 | 31 | 29 | 65.5% | 2 |
| September 2025 | 30 | 30 | 80.0% | 0 |
| October 2025 | 31 | 31 | 71.0% | 0 |
| November 2025 | 29 | 26 | 73.1% | 3 |
| December 2025 | 28 | 27 | 66.7% | 1 |
| January 2026 | 27 | 26 | 61.5% | 1 |
| February 2026 | 27 | 25 | 72.0% | 2 |
| March 2026 | 24 | 22 | 81.8% | 2 |
| April 2026 | 28 | 28 | 85.7% | 0 |
| May 2026 | 31 | 31 | 87.1% | 0 |
| June 2026 | 30 | 28 | 64.3% | 2 |
| July 2026 | 31 | 29 | 75.9% | 2 |