YX4479
YX4479 (Republic Airways) is a multi-stop service on 12 routes, busiest St Louis to New York. Of 818 departures recorded from October 2024 to July 2026, 81.3% left on time, according to the US BTS.
- On-time departures81.3%of 818 flights
- Average delay8.7 min
- July 202657▲ 90.0%vs July 2025
- Cancelled4.0%
- Legs flown under this number12
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 | 56 | 32 | ▼ 42.9% |
| February | 54 | 24 | ▼ 55.6% |
| March | 57 | 30 | ▼ 47.4% |
| April | 52 | 30 | ▼ 42.3% |
| May | 7 | 39 | ▲ 457.1% |
| June | 26 | 56 | ▲ 115.4% |
| July | 30 | 57 | ▲ 90.0% |
| August | 27 | – | – |
| September | 2 | – | – |
| October | 26 | – | in progress |
| November | 29 | – | – |
| December | 53 | – | – |
| Year to date (Jan–Jul) | 282 | 268 | ▼ 5.0% |
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 | 90.6% | 82.8% | ▼ 8.6% |
| February | 90.7% | 72.7% | ▼ 19.8% |
| March | 93.0% | 71.4% | ▼ 23.2% |
| April | 78.9% | 76.7% | ▼ 2.8% |
| May | 100.0% | 83.8% | ▼ 16.2% |
| June | 60.9% | 83.3% | ▲ 36.9% |
| July | 66.7% | 80.4% | ▲ 20.6% |
| August | 76.9% | – | – |
| September | 100.0% | – | – |
| October | 88.5% | – | in progress |
| November | 67.9% | – | – |
| December | 58.8% | – | – |
| Year-to-date average (Jan–Jul) | 83.0% | 78.7% | ▼ 5.1% |
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 | 3 | 3 | 0.0% |
| February | 0 | 2 | – |
| March | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 2 | – |
| June | 3 | 2 | ▼ 33.3% |
| July | 6 | 6 | 0.0% |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 2 | – | – |
| Year to date (Jan–Jul) | 12 | 17 | ▲ 41.7% |
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 96.0% 785
- Cancelled 4.0% 33
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
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| STL LGA St. Louis Lambert International Airport – LaGuardia Airport | 1,426 | 5.2 min | 83.0% | 229 |
| LGA STL LaGuardia Airport – St. Louis Lambert International Airport | 1,426 | -0.4 min | 88.9% | 145 |
| LGA BOS LaGuardia Airport – Boston Logan International Airport | 296 | 21.8 min | 66.7% | 134 |
| BOS LGA Boston Logan International Airport – LaGuardia Airport | 296 | 19.6 min | 75.3% | 79 |
| LGA PIT LaGuardia Airport – Pittsburgh International Airport | 538 | 7.9 min | 85.3% | 71 |
| PIT LGA Pittsburgh International Airport – LaGuardia Airport | 538 | 17.5 min | 76.8% | 61 |
| PIT JFK Pittsburgh International Airport – John F. Kennedy International Airport | 545 | -2.1 min | 90.5% | 44 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 34 | 34 | 79.4% | 0 |
| November 2024 | 49 | 49 | 89.8% | 0 |
| December 2024 | 48 | 48 | 93.8% | 0 |
| January 2025 | 56 | 53 | 90.6% | 3 |
| February 2025 | 54 | 54 | 90.7% | 0 |
| March 2025 | 57 | 57 | 93.0% | 0 |
| April 2025 | 52 | 52 | 78.9% | 0 |
| May 2025 | 7 | 7 | 100.0% | 0 |
| June 2025 | 26 | 23 | 60.9% | 3 |
| July 2025 | 30 | 24 | 66.7% | 6 |
| August 2025 | 27 | 26 | 76.9% | 1 |
| September 2025 | 2 | 2 | 100.0% | 0 |
| October 2025 | 26 | 26 | 88.5% | 0 |
| November 2025 | 29 | 28 | 67.9% | 1 |
| December 2025 | 53 | 51 | 58.8% | 2 |
| January 2026 | 32 | 29 | 82.8% | 3 |
| February 2026 | 24 | 22 | 72.7% | 2 |
| March 2026 | 30 | 28 | 71.4% | 2 |
| April 2026 | 30 | 30 | 76.7% | 0 |
| May 2026 | 39 | 37 | 83.8% | 2 |
| June 2026 | 56 | 54 | 83.3% | 2 |
| July 2026 | 57 | 51 | 80.4% | 6 |