YX4339
YX4339 (Republic Airways) is a multi-stop service on 23 routes, busiest New York to Detroit. Of 613 departures recorded from October 2024 to July 2026, 88.2% left on time, according to the US BTS.
- On-time departures88.2%of 613 flights
- Average delay5.1 min
- July 202630▲ 275.0%vs July 2025
- Cancelled3.4%
- Legs flown under this number23
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 | 30 | ▲ 7.1% |
| February | 23 | 28 | ▲ 21.7% |
| March | 13 | 14 | ▲ 7.7% |
| April | 23 | 26 | ▲ 13.0% |
| May | 30 | 31 | ▲ 3.3% |
| June | 12 | 30 | ▲ 150.0% |
| July | 8 | 30 | ▲ 275.0% |
| August | 32 | – | – |
| September | 50 | – | – |
| October | 57 | – | in progress |
| November | 29 | – | – |
| December | 30 | – | – |
| Year to date (Jan–Jul) | 137 | 189 | ▲ 38.0% |
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 | 80.8% | 88.5% | ▲ 9.5% |
| February | 68.4% | 84.0% | ▲ 22.8% |
| March | 100.0% | 100.0% | 0.0% |
| April | 100.0% | 84.6% | ▼ 15.4% |
| May | 86.7% | 82.8% | ▼ 4.5% |
| June | 58.3% | 92.9% | ▲ 59.2% |
| July | 62.5% | 89.7% | ▲ 43.5% |
| August | 100.0% | – | – |
| September | 94.0% | – | – |
| October | 80.0% | – | in progress |
| November | 96.4% | – | – |
| December | 80.0% | – | – |
| Year-to-date average (Jan–Jul) | 79.5% | 88.9% | ▲ 11.8% |
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 | 2 | 4 | ▲ 100.0% |
| February | 4 | 3 | ▼ 25.0% |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 2 | – |
| June | 0 | 2 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 2 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 6 | 12 | ▲ 100.0% |
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 96.6% 592
- Cancelled 3.4% 21
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 |
|---|---|---|---|---|
| LGA DTW LaGuardia Airport – Detroit Metropolitan Wayne County Airport | 805 | 4.9 min | 90.6% | 188 |
| ORD DCA Chicago O'Hare International Airport – Ronald Reagan Washington National Airport | 983 | 1.5 min | 91.2% | 71 |
| DTW LGA Detroit Metropolitan Wayne County Airport – LaGuardia Airport | 805 | 7.6 min | 81.6% | 51 |
| JFK DCA John F. Kennedy International Airport – Ronald Reagan Washington National Airport | 342 | 23.2 min | 81.0% | 44 |
| LGA STL LaGuardia Airport – St. Louis Lambert International Airport | 1,426 | -4.0 min | 97.7% | 43 |
| ORD BNA Chicago O'Hare International Airport – Nashville International Airport | 660 | 5.0 min | 81.8% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 34 | 34 | 97.1% | 0 |
| November 2024 | 29 | 29 | 93.1% | 0 |
| December 2024 | 26 | 26 | 92.3% | 0 |
| January 2025 | 28 | 26 | 80.8% | 2 |
| February 2025 | 23 | 19 | 68.4% | 4 |
| March 2025 | 13 | 13 | 100.0% | 0 |
| April 2025 | 23 | 23 | 100.0% | 0 |
| May 2025 | 30 | 30 | 86.7% | 0 |
| June 2025 | 12 | 12 | 58.3% | 0 |
| July 2025 | 8 | 8 | 62.5% | 0 |
| August 2025 | 32 | 32 | 100.0% | 0 |
| September 2025 | 50 | 50 | 94.0% | 0 |
| October 2025 | 57 | 55 | 80.0% | 2 |
| November 2025 | 29 | 28 | 96.4% | 1 |
| December 2025 | 30 | 30 | 80.0% | 0 |
| January 2026 | 30 | 26 | 88.5% | 4 |
| February 2026 | 28 | 25 | 84.0% | 3 |
| March 2026 | 14 | 14 | 100.0% | 0 |
| April 2026 | 26 | 26 | 84.6% | 0 |
| May 2026 | 31 | 29 | 82.8% | 2 |
| June 2026 | 30 | 28 | 92.9% | 2 |
| July 2026 | 30 | 29 | 89.7% | 1 |