YX4397
YX4397 (Republic Airways) is a multi-stop service on 29 routes, busiest Charleston to Washington. Of 592 departures recorded from October 2024 to July 2026, 76.7% left on time, according to the US BTS.
- On-time departures76.7%of 592 flights
- Average delay13.0 min
- July 202635▲ 20.7%vs July 2025
- Cancelled4.4%
- 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 | 28 | 62 | ▲ 121.4% |
| February | 12 | 39 | ▲ 225.0% |
| March | 2 | 13 | ▲ 550.0% |
| April | 27 | 44 | ▲ 63.0% |
| May | 27 | 48 | ▲ 77.8% |
| June | 30 | 34 | ▲ 13.3% |
| July | 29 | 35 | ▲ 20.7% |
| August | 23 | – | – |
| September | 9 | – | – |
| October | 2 | – | in progress |
| November | 29 | – | – |
| December | 40 | – | – |
| Year to date (Jan–Jul) | 155 | 275 | ▲ 77.4% |
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 | 85.2% | 73.2% | ▼ 14.1% |
| February | 100.0% | 67.6% | ▼ 32.4% |
| March | 100.0% | 76.9% | ▼ 23.1% |
| April | 88.9% | 95.5% | ▲ 7.4% |
| May | 100.0% | 81.3% | ▼ 18.8% |
| June | 53.3% | 80.7% | ▲ 51.2% |
| July | 48.2% | 46.4% | ▼ 3.6% |
| August | 71.4% | – | – |
| September | 100.0% | – | – |
| October | 100.0% | – | in progress |
| November | 65.5% | – | – |
| December | 62.2% | – | – |
| Year-to-date average (Jan–Jul) | 82.2% | 74.5% | ▼ 9.4% |
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 | 1 | 6 | ▲ 500.0% |
| February | 0 | 2 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 3 | – |
| July | 2 | 7 | ▲ 250.0% |
| August | 2 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 3 | – | – |
| Year to date (Jan–Jul) | 3 | 18 | ▲ 500.0% |
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 95.6% 566
- Cancelled 4.4% 26
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
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DCA CHS Ronald Reagan Washington National Airport – Charleston International Airport | 715 | 5.8 min | 79.7% | 72 |
| CHS DCA Charleston International Airport – Ronald Reagan Washington National Airport | 715 | 10.9 min | 76.8% | 72 |
| BOS LGA Boston Logan International Airport – LaGuardia Airport | 296 | 30.6 min | 67.9% | 61 |
| ORD DTW Chicago O'Hare International Airport – Detroit Metropolitan Wayne County Airport | 376 | 41.3 min | 48.3% | 60 |
| BOS DCA Boston Logan International Airport – Ronald Reagan Washington National Airport | 641 | -2.4 min | 94.8% | 58 |
| JFK BOS John F. Kennedy International Airport – Boston Logan International Airport | 300 | 10.3 min | 77.8% | 54 |
| PHL BNA Philadelphia International Airport – Nashville International Airport | 1,084 | -2.4 min | 93.6% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 95.0% | 0 |
| November 2024 | 14 | 14 | 100.0% | 0 |
| December 2024 | 25 | 25 | 84.0% | 0 |
| January 2025 | 28 | 27 | 85.2% | 1 |
| February 2025 | 12 | 12 | 100.0% | 0 |
| March 2025 | 2 | 2 | 100.0% | 0 |
| April 2025 | 27 | 27 | 88.9% | 0 |
| May 2025 | 27 | 27 | 100.0% | 0 |
| June 2025 | 30 | 30 | 53.3% | 0 |
| July 2025 | 29 | 27 | 48.2% | 2 |
| August 2025 | 23 | 21 | 71.4% | 2 |
| September 2025 | 9 | 9 | 100.0% | 0 |
| October 2025 | 2 | 2 | 100.0% | 0 |
| November 2025 | 29 | 29 | 65.5% | 0 |
| December 2025 | 40 | 37 | 62.2% | 3 |
| January 2026 | 62 | 56 | 73.2% | 6 |
| February 2026 | 39 | 37 | 67.6% | 2 |
| March 2026 | 13 | 13 | 76.9% | 0 |
| April 2026 | 44 | 44 | 95.5% | 0 |
| May 2026 | 48 | 48 | 81.3% | 0 |
| June 2026 | 34 | 31 | 80.7% | 3 |
| July 2026 | 35 | 28 | 46.4% | 7 |