YX4557
YX4557 (Republic Airways) is a multi-stop service on 29 routes, busiest Philadelphia to Indianapolis. Of 584 departures recorded from October 2024 to July 2026, 80.9% left on time, according to the US BTS.
- On-time departures80.9%of 584 flights
- Average delay9.7 min
- July 202622▼ 18.5%vs July 2025
- Cancelled6.7%
- Legs flown under this number29
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 | 5 | 26 | ▲ 420.0% |
| February | 26 | 24 | ▼ 7.7% |
| March | 34 | 27 | ▼ 20.6% |
| April | 30 | 29 | ▼ 3.3% |
| May | 31 | 30 | ▼ 3.2% |
| June | 26 | 24 | ▼ 7.7% |
| July | 27 | 22 | ▼ 18.5% |
| August | 29 | – | – |
| September | 48 | – | – |
| October | 33 | – | in progress |
| November | 46 | – | – |
| December | 8 | – | – |
| Year to date (Jan–Jul) | 179 | 182 | ▲ 1.7% |
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 | 100.0% | 78.3% | ▼ 21.7% |
| February | 88.5% | 85.7% | ▼ 3.1% |
| March | 78.8% | 70.8% | ▼ 10.1% |
| April | 69.0% | 75.9% | ▲ 10.0% |
| May | 63.3% | 89.7% | ▲ 41.6% |
| June | 72.2% | 90.9% | ▲ 25.9% |
| July | 68.4% | 95.2% | ▲ 39.2% |
| August | 96.6% | – | – |
| September | 72.9% | – | – |
| October | 87.9% | – | in progress |
| November | 100.0% | – | – |
| December | 62.5% | – | – |
| Year-to-date average (Jan–Jul) | 77.2% | 83.8% | ▲ 8.6% |
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 | 3 | – |
| February | 0 | 3 | – |
| March | 1 | 3 | ▲ 200.0% |
| April | 1 | 0 | ▼ 100.0% |
| May | 1 | 1 | 0.0% |
| June | 8 | 2 | ▼ 75.0% |
| July | 8 | 1 | ▼ 87.5% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 7 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 19 | 13 | ▼ 31.6% |
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 93.3% 545
- Cancelled 6.7% 39
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| PHL IND Philadelphia International Airport – Indianapolis International Airport | 944 | 14.9 min | 75.0% | 106 |
| LGA ORD LaGuardia Airport – Chicago O'Hare International Airport | 1,177 | 14.5 min | 75.0% | 81 |
| DCA BUF Ronald Reagan Washington National Airport – Buffalo Niagara International Airport | 476 | 8.1 min | 79.3% | 44 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 6 | 6 | 100.0% | 0 |
| November 2024 | 18 | 18 | 94.4% | 0 |
| December 2024 | 35 | 35 | 62.9% | 0 |
| January 2025 | 5 | 5 | 100.0% | 0 |
| February 2025 | 26 | 26 | 88.5% | 0 |
| March 2025 | 34 | 33 | 78.8% | 1 |
| April 2025 | 30 | 29 | 69.0% | 1 |
| May 2025 | 31 | 30 | 63.3% | 1 |
| June 2025 | 26 | 18 | 72.2% | 8 |
| July 2025 | 27 | 19 | 68.4% | 8 |
| August 2025 | 29 | 29 | 96.6% | 0 |
| September 2025 | 48 | 48 | 72.9% | 0 |
| October 2025 | 33 | 33 | 87.9% | 0 |
| November 2025 | 46 | 39 | 100.0% | 7 |
| December 2025 | 8 | 8 | 62.5% | 0 |
| January 2026 | 26 | 23 | 78.3% | 3 |
| February 2026 | 24 | 21 | 85.7% | 3 |
| March 2026 | 27 | 24 | 70.8% | 3 |
| April 2026 | 29 | 29 | 75.9% | 0 |
| May 2026 | 30 | 29 | 89.7% | 1 |
| June 2026 | 24 | 22 | 90.9% | 2 |
| July 2026 | 22 | 21 | 95.2% | 1 |