YX4637
YX4637 (Republic Airways) is a multi-stop service on 4 routes, busiest Philadelphia to Indianapolis. Of 566 departures recorded from October 2024 to July 2026, 78.7% left on time, according to the US BTS.
- On-time departures78.7%of 566 flights
- Average delay13.2 min
- July 202631▲ 0.0%vs July 2025
- Cancelled4.8%
- Legs flown under this number4
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 | 28 | 31 | ▲ 10.7% |
| February | 26 | 28 | ▲ 7.7% |
| March | 31 | 31 | 0.0% |
| April | 30 | 6 | ▼ 80.0% |
| May | 3 | 11 | ▲ 266.7% |
| June | 26 | 30 | ▲ 15.4% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 29 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 175 | 168 | ▼ 4.0% |
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 | 96.3% | 85.7% | ▼ 11.0% |
| February | 84.6% | 80.8% | ▼ 4.5% |
| March | 93.6% | 77.4% | ▼ 17.2% |
| April | 86.7% | 50.0% | ▼ 42.3% |
| May | 100.0% | 72.7% | ▼ 27.3% |
| June | 47.6% | 75.9% | ▲ 59.3% |
| July | 62.5% | 77.8% | ▲ 24.4% |
| August | 62.1% | – | – |
| September | 93.1% | – | – |
| October | 80.7% | – | in progress |
| November | 86.2% | – | – |
| December | 56.7% | – | – |
| Year-to-date average (Jan–Jul) | 81.6% | 74.3% | ▼ 8.9% |
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 | 1 | 3 | ▲ 200.0% |
| February | 0 | 2 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 5 | 1 | ▼ 80.0% |
| July | 7 | 4 | ▼ 42.9% |
| August | 2 | – | – |
| September | 1 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 13 | 10 | ▼ 23.1% |
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 95.2% 539
- Cancelled 4.8% 27
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
2| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| PHL IND Philadelphia International Airport – Indianapolis International Airport | 944 | 14.4 min | 77.0% | 513 |
| ORD ATL Chicago O'Hare International Airport – Hartsfield Jackson Atlanta International Airport | 976 | 7.0 min | 90.0% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 85.0% | 0 |
| November 2024 | 23 | 23 | 100.0% | 0 |
| December 2024 | 28 | 28 | 64.3% | 0 |
| January 2025 | 28 | 27 | 96.3% | 1 |
| February 2025 | 26 | 26 | 84.6% | 0 |
| March 2025 | 31 | 31 | 93.6% | 0 |
| April 2025 | 30 | 30 | 86.7% | 0 |
| May 2025 | 3 | 3 | 100.0% | 0 |
| June 2025 | 26 | 21 | 47.6% | 5 |
| July 2025 | 31 | 24 | 62.5% | 7 |
| August 2025 | 31 | 29 | 62.1% | 2 |
| September 2025 | 30 | 29 | 93.1% | 1 |
| October 2025 | 31 | 31 | 80.7% | 0 |
| November 2025 | 29 | 29 | 86.2% | 0 |
| December 2025 | 31 | 30 | 56.7% | 1 |
| January 2026 | 31 | 28 | 85.7% | 3 |
| February 2026 | 28 | 26 | 80.8% | 2 |
| March 2026 | 31 | 31 | 77.4% | 0 |
| April 2026 | 6 | 6 | 50.0% | 0 |
| May 2026 | 11 | 11 | 72.7% | 0 |
| June 2026 | 30 | 29 | 75.9% | 1 |
| July 2026 | 31 | 27 | 77.8% | 4 |