YX4366
YX4366 (Republic Airways) is a multi-stop service on 24 routes, busiest Washington to Boston. Of 613 departures recorded from October 2024 to July 2026, 83.8% left on time, according to the US BTS.
- On-time departures83.8%of 613 flights
- Average delay6.6 min
- July 202631▲ 0.0%vs July 2025
- Cancelled3.4%
- Legs flown under this number24
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 | 36 | 31 | ▼ 13.9% |
| February | 28 | 25 | ▼ 10.7% |
| March | 31 | 30 | ▼ 3.2% |
| April | 11 | 30 | ▲ 172.7% |
| May | 32 | 21 | ▼ 34.4% |
| June | 30 | 30 | 0.0% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 9 | – | – |
| December | 32 | – | – |
| Year to date (Jan–Jul) | 199 | 198 | ▼ 0.5% |
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 | 93.6% | 78.6% | ▼ 16.0% |
| February | 89.3% | 81.8% | ▼ 8.4% |
| March | 93.6% | 53.6% | ▼ 42.7% |
| April | 81.8% | 85.7% | ▲ 4.8% |
| May | 86.7% | 85.7% | ▼ 1.1% |
| June | 86.7% | 80.0% | ▼ 7.7% |
| July | 74.2% | 82.8% | ▲ 11.6% |
| August | 80.7% | – | – |
| September | 90.0% | – | – |
| October | 83.3% | – | in progress |
| November | 75.0% | – | – |
| December | 68.8% | – | – |
| Year-to-date average (Jan–Jul) | 86.5% | 78.3% | ▼ 9.5% |
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 | 5 | 3 | ▼ 40.0% |
| February | 0 | 3 | – |
| March | 0 | 2 | – |
| April | 0 | 2 | – |
| May | 2 | 0 | ▼ 100.0% |
| June | 0 | 0 | – |
| July | 0 | 2 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 1 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 7 | 12 | ▲ 71.4% |
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
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DCA BOS Ronald Reagan Washington National Airport – Boston Logan International Airport | 641 | 0.6 min | 90.1% | 174 |
| LGA STL LaGuardia Airport – St. Louis Lambert International Airport | 1,426 | 14.4 min | 79.2% | 79 |
| BOS JFK Boston Logan International Airport – John F. Kennedy International Airport | 300 | 6.6 min | 80.0% | 72 |
| BOS DCA Boston Logan International Airport – Ronald Reagan Washington National Airport | 641 | 3.3 min | 88.1% | 69 |
| DCA PIT Ronald Reagan Washington National Airport – Pittsburgh International Airport | 329 | 3.9 min | 85.0% | 61 |
| ORD DTW Chicago O'Hare International Airport – Detroit Metropolitan Wayne County Airport | 376 | 4.4 min | 85.7% | 30 |
| ORD ALB Chicago O'Hare International Airport – Albany International Airport | 1,161 | 29.1 min | 53.9% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 4 | 4 | 100.0% | 0 |
| November 2024 | 26 | 26 | 96.2% | 0 |
| December 2024 | 53 | 53 | 94.3% | 0 |
| January 2025 | 36 | 31 | 93.6% | 5 |
| February 2025 | 28 | 28 | 89.3% | 0 |
| March 2025 | 31 | 31 | 93.6% | 0 |
| April 2025 | 11 | 11 | 81.8% | 0 |
| May 2025 | 32 | 30 | 86.7% | 2 |
| June 2025 | 30 | 30 | 86.7% | 0 |
| July 2025 | 31 | 31 | 74.2% | 0 |
| August 2025 | 31 | 31 | 80.7% | 0 |
| September 2025 | 30 | 30 | 90.0% | 0 |
| October 2025 | 31 | 30 | 83.3% | 1 |
| November 2025 | 9 | 8 | 75.0% | 1 |
| December 2025 | 32 | 32 | 68.8% | 0 |
| January 2026 | 31 | 28 | 78.6% | 3 |
| February 2026 | 25 | 22 | 81.8% | 3 |
| March 2026 | 30 | 28 | 53.6% | 2 |
| April 2026 | 30 | 28 | 85.7% | 2 |
| May 2026 | 21 | 21 | 85.7% | 0 |
| June 2026 | 30 | 30 | 80.0% | 0 |
| July 2026 | 31 | 29 | 82.8% | 2 |