YX4455
YX4455 (Republic Airways) is a multi-stop service on 18 routes, busiest Washington to Boston. Of 612 departures recorded from October 2024 to July 2026, 80.4% left on time, according to the US BTS.
- On-time departures80.4%of 612 flights
- Average delay8.7 min
- July 202632▲ 14.3%vs July 2025
- Cancelled4.1%
- Legs flown under this number18
according to the US BTS · Oct 12, 2024 → Jul 31, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 23 | 35 | ▲ 52.2% |
| February | 22 | 26 | ▲ 18.2% |
| March | 30 | 26 | ▼ 13.3% |
| April | 4 | 29 | ▲ 625.0% |
| May | 27 | 42 | ▲ 55.6% |
| June | 30 | 56 | ▲ 86.7% |
| July | 28 | 32 | ▲ 14.3% |
| August | 27 | – | – |
| September | 29 | – | – |
| October | 31 | – | in progress |
| November | 28 | – | – |
| December | 43 | – | – |
| Year to date (Jan–Jul) | 164 | 246 | ▲ 50.0% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 76.2% | 80.7% | ▲ 5.9% |
| February | 95.0% | 100.0% | ▲ 5.3% |
| March | 86.7% | 88.0% | ▲ 1.5% |
| April | 50.0% | 79.3% | ▲ 58.6% |
| May | 66.7% | 85.4% | ▲ 28.0% |
| June | 60.0% | 83.9% | ▲ 39.9% |
| July | 68.4% | 66.7% | ▼ 2.6% |
| August | 50.0% | – | – |
| September | 79.3% | – | – |
| October | 77.4% | – | in progress |
| November | 96.4% | – | – |
| December | 90.5% | – | – |
| Year-to-date average (Jan–Jul) | 71.9% | 83.4% | ▲ 16.1% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 2 | 4 | ▲ 100.0% |
| February | 2 | 2 | 0.0% |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 1 | – |
| June | 0 | 0 | – |
| July | 9 | 2 | ▼ 77.8% |
| August | 1 | – | – |
| September | 0 | – | – |
| 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 not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
This number flies several legs
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 95.9% 587
- Cancelled 4.1% 25
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
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DCA BOS Ronald Reagan Washington National Airport – Boston Logan International Airport | 641 | 1.0 min | 91.7% | 204 |
| ORD IND Chicago O'Hare International Airport – Indianapolis International Airport | 286 | 13.6 min | 71.3% | 87 |
| JFK IND John F. Kennedy International Airport – Indianapolis International Airport | 1,067 | 19.2 min | 74.4% | 44 |
| PHL OMA Philadelphia International Airport – Eppley Airfield | 1,747 | 1.0 min | 90.0% | 40 |
| OMA PHL Eppley Airfield – Philadelphia International Airport | 1,747 | 12.3 min | 82.5% | 40 |
| JFK BOS John F. Kennedy International Airport – Boston Logan International Airport | 300 | 12.9 min | 66.7% | 36 |
| BOS DCA Boston Logan International Airport – Ronald Reagan Washington National Airport | 641 | 19.4 min | 65.2% | 32 |
| CMH ORD John Glenn Columbus International Airport – Chicago O'Hare International Airport | 475 | 15.4 min | 67.9% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 94.1% | 0 |
| November 2024 | 7 | 7 | 85.7% | 0 |
| December 2024 | 20 | 20 | 85.0% | 0 |
| January 2025 | 23 | 21 | 76.2% | 2 |
| February 2025 | 22 | 20 | 95.0% | 2 |
| March 2025 | 30 | 30 | 86.7% | 0 |
| April 2025 | 4 | 4 | 50.0% | 0 |
| May 2025 | 27 | 27 | 66.7% | 0 |
| June 2025 | 30 | 30 | 60.0% | 0 |
| July 2025 | 28 | 19 | 68.4% | 9 |
| August 2025 | 27 | 26 | 50.0% | 1 |
| September 2025 | 29 | 29 | 79.3% | 0 |
| October 2025 | 31 | 31 | 77.4% | 0 |
| November 2025 | 28 | 28 | 96.4% | 0 |
| December 2025 | 43 | 42 | 90.5% | 1 |
| January 2026 | 35 | 31 | 80.7% | 4 |
| February 2026 | 26 | 24 | 100.0% | 2 |
| March 2026 | 26 | 25 | 88.0% | 1 |
| April 2026 | 29 | 29 | 79.3% | 0 |
| May 2026 | 42 | 41 | 85.4% | 1 |
| June 2026 | 56 | 56 | 83.9% | 0 |
| July 2026 | 32 | 30 | 66.7% | 2 |