YX4386
YX4386 (Republic Airways) is a multi-stop service on 21 routes, busiest Boston to St Louis. Of 566 departures recorded from October 2024 to July 2026, 87.7% left on time, according to the US BTS.
- On-time departures87.7%of 566 flights
- Average delay7.9 min
- July 202631▲ 0.0%vs July 2025
- Cancelled3.5%
- 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 | 24 | 29 | ▲ 20.8% |
| February | 20 | 25 | ▲ 25.0% |
| March | 32 | 30 | ▼ 6.3% |
| April | 8 | 9 | ▲ 12.5% |
| May | 27 | 14 | ▼ 48.1% |
| June | 29 | 30 | ▲ 3.4% |
| July | 31 | 31 | 0.0% |
| August | 23 | – | – |
| September | 26 | – | – |
| October | 40 | – | in progress |
| November | 31 | – | – |
| December | 30 | – | – |
| Year to date (Jan–Jul) | 171 | 168 | ▼ 1.8% |
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 | 100.0% | 92.0% | ▼ 8.0% |
| February | 100.0% | 87.0% | ▼ 13.0% |
| March | 100.0% | 80.0% | ▼ 20.0% |
| April | 100.0% | 87.5% | ▼ 12.5% |
| May | 74.1% | 85.7% | ▲ 15.7% |
| June | 89.7% | 70.0% | ▼ 21.9% |
| July | 89.3% | 85.7% | ▼ 4.0% |
| August | 87.0% | – | – |
| September | 76.0% | – | – |
| October | 97.4% | – | in progress |
| November | 80.7% | – | – |
| December | 72.4% | – | – |
| Year-to-date average (Jan–Jul) | 93.3% | 84.0% | ▼ 10.0% |
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 | 2 | 2 | 0.0% |
| March | 0 | 0 | – |
| April | 0 | 1 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 3 | 3 | 0.0% |
| August | 0 | – | – |
| September | 1 | – | – |
| October | 1 | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 7 | 10 | ▲ 42.9% |
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 96.5% 546
- Cancelled 3.5% 20
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
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BOS STL Boston Logan International Airport – St. Louis Lambert International Airport | 1,680 | -6.9 min | 99.0% | 104 |
| CLE PHL Cleveland Hopkins International Airport – Philadelphia International Airport | 583 | -1.6 min | 94.4% | 75 |
| BOS ORD Boston Logan International Airport – Chicago O'Hare International Airport | 1,391 | 29.8 min | 78.3% | 72 |
| LGA DCA LaGuardia Airport – Ronald Reagan Washington National Airport | 345 | 5.8 min | 79.6% | 49 |
| XNA PHL Northwest Arkansas National Airport – Philadelphia International Airport | 1,712 | -1.1 min | 96.8% | 35 |
| JFK IND John F. Kennedy International Airport – Indianapolis International Airport | 1,067 | 4.3 min | 77.4% | 31 |
| CLE ORD Cleveland Hopkins International Airport – Chicago O'Hare International Airport | 507 | 11.5 min | 89.7% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 100.0% | 0 |
| November 2024 | 29 | 29 | 96.6% | 0 |
| December 2024 | 28 | 28 | 92.9% | 0 |
| January 2025 | 24 | 22 | 100.0% | 2 |
| February 2025 | 20 | 18 | 100.0% | 2 |
| March 2025 | 32 | 32 | 100.0% | 0 |
| April 2025 | 8 | 8 | 100.0% | 0 |
| May 2025 | 27 | 27 | 74.1% | 0 |
| June 2025 | 29 | 29 | 89.7% | 0 |
| July 2025 | 31 | 28 | 89.3% | 3 |
| August 2025 | 23 | 23 | 87.0% | 0 |
| September 2025 | 26 | 25 | 76.0% | 1 |
| October 2025 | 40 | 39 | 97.4% | 1 |
| November 2025 | 31 | 31 | 80.7% | 0 |
| December 2025 | 30 | 29 | 72.4% | 1 |
| January 2026 | 29 | 25 | 92.0% | 4 |
| February 2026 | 25 | 23 | 87.0% | 2 |
| March 2026 | 30 | 30 | 80.0% | 0 |
| April 2026 | 9 | 8 | 87.5% | 1 |
| May 2026 | 14 | 14 | 85.7% | 0 |
| June 2026 | 30 | 30 | 70.0% | 0 |
| July 2026 | 31 | 28 | 85.7% | 3 |