YX4399
YX4399 (Republic Airways) is a multi-stop service on 15 routes, busiest Washington to Columbus. Of 669 departures recorded from October 2024 to July 2026, 86.1% left on time, according to the US BTS.
- On-time departures86.1%of 669 flights
- Average delay6.6 min
- July 202654▲ 92.9%vs July 2025
- Cancelled2.1%
- Legs flown under this number15
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 | 24 | 45 | ▲ 87.5% |
| March | 24 | 55 | ▲ 129.2% |
| April | 27 | 34 | ▲ 25.9% |
| May | 30 | 37 | ▲ 23.3% |
| June | 30 | 56 | ▲ 86.7% |
| July | 28 | 54 | ▲ 92.9% |
| August | 6 | – | – |
| September | 11 | – | – |
| October | 24 | – | in progress |
| November | 25 | – | – |
| December | 27 | – | – |
| Year to date (Jan–Jul) | 191 | 312 | ▲ 63.4% |
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 | 89.3% | 82.8% | ▼ 7.3% |
| February | 87.5% | 90.5% | ▲ 3.4% |
| March | 83.3% | 92.0% | ▲ 10.4% |
| April | 96.3% | 100.0% | ▲ 3.8% |
| May | 96.7% | 94.6% | ▼ 2.2% |
| June | 76.7% | 96.4% | ▲ 25.8% |
| July | 53.6% | 78.9% | ▲ 47.2% |
| August | 66.7% | – | – |
| September | 81.8% | – | – |
| October | 58.3% | – | in progress |
| November | 79.2% | – | – |
| December | 84.6% | – | – |
| Year-to-date average (Jan–Jul) | 83.3% | 90.7% | ▲ 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 | 0 | 2 | – |
| February | 0 | 3 | – |
| March | 0 | 5 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 2 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 0 | 12 |
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 97.9% 655
- Cancelled 2.1% 14
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DCA CMH Ronald Reagan Washington National Airport – John Glenn Columbus International Airport | 519 | 7.3 min | 84.7% | 208 |
| BOS PHL Boston Logan International Airport – Philadelphia International Airport | 450 | -3.3 min | 97.1% | 105 |
| ORD RDU Chicago O'Hare International Airport – Raleigh-Durham International Airport | 1,039 | 27.0 min | 63.8% | 94 |
| CMH BOS John Glenn Columbus International Airport – Boston Logan International Airport | 1,028 | 5.5 min | 86.9% | 62 |
| BOS CMH Boston Logan International Airport – John Glenn Columbus International Airport | 1,028 | 3.1 min | 90.0% | 61 |
| BOS LGA Boston Logan International Airport – LaGuardia Airport | 296 | 0.5 min | 92.9% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 95.0% | 0 |
| November 2024 | 25 | 25 | 84.0% | 0 |
| December 2024 | 28 | 28 | 89.3% | 0 |
| January 2025 | 28 | 28 | 89.3% | 0 |
| February 2025 | 24 | 24 | 87.5% | 0 |
| March 2025 | 24 | 24 | 83.3% | 0 |
| April 2025 | 27 | 27 | 96.3% | 0 |
| May 2025 | 30 | 30 | 96.7% | 0 |
| June 2025 | 30 | 30 | 76.7% | 0 |
| July 2025 | 28 | 28 | 53.6% | 0 |
| August 2025 | 6 | 6 | 66.7% | 0 |
| September 2025 | 11 | 11 | 81.8% | 0 |
| October 2025 | 24 | 24 | 58.3% | 0 |
| November 2025 | 25 | 24 | 79.2% | 1 |
| December 2025 | 27 | 26 | 84.6% | 1 |
| January 2026 | 31 | 29 | 82.8% | 2 |
| February 2026 | 45 | 42 | 90.5% | 3 |
| March 2026 | 55 | 50 | 92.0% | 5 |
| April 2026 | 34 | 34 | 100.0% | 0 |
| May 2026 | 37 | 37 | 94.6% | 0 |
| June 2026 | 56 | 56 | 96.4% | 0 |
| July 2026 | 54 | 52 | 78.9% | 2 |