YX4540
YX4540 (Republic Airways) is a multi-stop service on 21 routes, busiest Washington to Key West. Of 468 departures recorded from October 2024 to July 2026, 86.9% left on time, according to the US BTS.
- On-time departures86.9%of 468 flights
- Average delay5.4 min
- July 202614▼ 48.1%vs July 2025
- Cancelled0.9%
- Legs flown under this number21
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 | 6 | 26 | ▲ 333.3% |
| February | 4 | 27 | ▲ 575.0% |
| March | 9 | 31 | ▲ 244.4% |
| April | 27 | 51 | ▲ 88.9% |
| May | 8 | 41 | ▲ 412.5% |
| June | 26 | 27 | ▲ 3.8% |
| July | 27 | 14 | ▼ 48.1% |
| August | 30 | – | – |
| September | 30 | – | – |
| October | 8 | – | in progress |
| November | 26 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 107 | 217 | ▲ 102.8% |
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 | 33.3% | 87.5% | ▲ 162.5% |
| February | 75.0% | 88.9% | ▲ 18.5% |
| March | 55.6% | 93.3% | ▲ 68.0% |
| April | 92.6% | 90.2% | ▼ 2.6% |
| May | 100.0% | 85.4% | ▼ 14.6% |
| June | 88.5% | 77.8% | ▼ 12.1% |
| July | 88.9% | 57.1% | ▼ 35.7% |
| August | 90.0% | – | – |
| September | 93.3% | – | – |
| October | 87.5% | – | in progress |
| November | 96.2% | – | – |
| December | 89.7% | – | – |
| Year-to-date average (Jan–Jul) | 76.3% | 82.9% | ▲ 8.7% |
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 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 1 | 0 | ▼ 100.0% |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 3 | ▲ 200.0% |
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 99.1% 464
- Cancelled 0.9% 4
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DCA EYW Ronald Reagan Washington National Airport – Key West International Airport | 1,651 | -0.3 min | 90.9% | 153 |
| CMH PHL John Glenn Columbus International Airport – Philadelphia International Airport | 652 | 3.4 min | 91.6% | 109 |
| LGA XNA LaGuardia Airport – Northwest Arkansas National Airport | 1,842 | 5.4 min | 84.1% | 44 |
| XNA LGA Northwest Arkansas National Airport – LaGuardia Airport | 1,842 | 3.0 min | 89.5% | 38 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 2 | 2 | 100.0% | 0 |
| November 2024 | 8 | 8 | 87.5% | 0 |
| December 2024 | 11 | 11 | 81.8% | 0 |
| January 2025 | 6 | 6 | 33.3% | 0 |
| February 2025 | 4 | 4 | 75.0% | 0 |
| March 2025 | 9 | 9 | 55.6% | 0 |
| April 2025 | 27 | 27 | 92.6% | 0 |
| May 2025 | 8 | 7 | 100.0% | 1 |
| June 2025 | 26 | 26 | 88.5% | 0 |
| July 2025 | 27 | 27 | 88.9% | 0 |
| August 2025 | 30 | 30 | 90.0% | 0 |
| September 2025 | 30 | 30 | 93.3% | 0 |
| October 2025 | 8 | 8 | 87.5% | 0 |
| November 2025 | 26 | 26 | 96.2% | 0 |
| December 2025 | 29 | 29 | 89.7% | 0 |
| January 2026 | 26 | 24 | 87.5% | 2 |
| February 2026 | 27 | 27 | 88.9% | 0 |
| March 2026 | 31 | 30 | 93.3% | 1 |
| April 2026 | 51 | 51 | 90.2% | 0 |
| May 2026 | 41 | 41 | 85.4% | 0 |
| June 2026 | 27 | 27 | 77.8% | 0 |
| July 2026 | 14 | 14 | 57.1% | 0 |