YX4439
YX4439 (Republic Airways) is a multi-stop service on 21 routes, busiest Boston to New York. Of 613 departures recorded from October 2024 to July 2026, 92.8% left on time, according to the US BTS.
- On-time departures92.8%of 613 flights
- Average delay0.8 min
- July 202631▲ 19.2%vs July 2025
- Cancelled2.9%
- Legs flown under this number21
according to the US BTS · Oct 12, 2024 → Jul 31, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 22 | 11 | ▼ 50.0% |
| February | 20 | 30 | ▲ 50.0% |
| March | 22 | 59 | ▲ 168.2% |
| April | 22 | 33 | ▲ 50.0% |
| May | 26 | 27 | ▲ 3.8% |
| June | 17 | 30 | ▲ 76.5% |
| July | 26 | 31 | ▲ 19.2% |
| August | 55 | – | – |
| September | 32 | – | – |
| October | 15 | – | in progress |
| November | 22 | – | – |
| December | 19 | – | – |
| Year to date (Jan–Jul) | 155 | 221 | ▲ 42.6% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 95.2% | 100.0% | ▲ 5.0% |
| February | 95.0% | 81.5% | ▼ 14.2% |
| March | 90.9% | 100.0% | ▲ 10.0% |
| April | 100.0% | 97.0% | ▼ 3.0% |
| May | 100.0% | 88.9% | ▼ 11.1% |
| June | 87.5% | 90.0% | ▲ 2.9% |
| July | 96.0% | 93.3% | ▼ 2.8% |
| August | 98.2% | – | – |
| September | 93.8% | – | – |
| October | 86.7% | – | in progress |
| November | 54.6% | – | – |
| December | 82.4% | – | – |
| Year-to-date average (Jan–Jul) | 95.0% | 93.0% | ▼ 2.1% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 1 | 0.0% |
| February | 0 | 3 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 1 | 1 | 0.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 2 | – | – |
| Year to date (Jan–Jul) | 3 | 5 | ▲ 66.7% |
according to the US BTS · October 2024 → July 2026
This is not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
This number flies several legs
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 97.1% 595
- Cancelled 2.9% 18
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
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BOS LGA Boston Logan International Airport – LaGuardia Airport | 296 | -4.3 min | 96.1% | 153 |
| ORD IND Chicago O'Hare International Airport – Indianapolis International Airport | 286 | 1.5 min | 91.4% | 71 |
| PIT ORD Pittsburgh International Airport – Chicago O'Hare International Airport | 662 | -0.3 min | 93.7% | 64 |
| SRQ PHL Sarasota Bradenton International Airport – Philadelphia International Airport | 1,542 | 6.9 min | 97.9% | 51 |
| PHL SRQ Philadelphia International Airport – Sarasota Bradenton International Airport | 1,542 | -6.2 min | 100.0% | 51 |
| ORF JFK Norfolk International Airport – John F. Kennedy International Airport | 466 | 2.4 min | 91.7% | 37 |
| DCA CMH Ronald Reagan Washington National Airport – John Glenn Columbus International Airport | 519 | -6.7 min | 100.0% | 30 |
| CMH DCA John Glenn Columbus International Airport – Ronald Reagan Washington National Airport | 519 | -6.3 min | 100.0% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 40 | 32 | 96.9% | 8 |
| November 2024 | 33 | 33 | 93.9% | 0 |
| December 2024 | 21 | 21 | 95.2% | 0 |
| January 2025 | 22 | 21 | 95.2% | 1 |
| February 2025 | 20 | 20 | 95.0% | 0 |
| March 2025 | 22 | 22 | 90.9% | 0 |
| April 2025 | 22 | 22 | 100.0% | 0 |
| May 2025 | 26 | 26 | 100.0% | 0 |
| June 2025 | 17 | 16 | 87.5% | 1 |
| July 2025 | 26 | 25 | 96.0% | 1 |
| August 2025 | 55 | 55 | 98.2% | 0 |
| September 2025 | 32 | 32 | 93.8% | 0 |
| October 2025 | 15 | 15 | 86.7% | 0 |
| November 2025 | 22 | 22 | 54.6% | 0 |
| December 2025 | 19 | 17 | 82.4% | 2 |
| January 2026 | 11 | 10 | 100.0% | 1 |
| February 2026 | 30 | 27 | 81.5% | 3 |
| March 2026 | 59 | 59 | 100.0% | 0 |
| April 2026 | 33 | 33 | 97.0% | 0 |
| May 2026 | 27 | 27 | 88.9% | 0 |
| June 2026 | 30 | 30 | 90.0% | 0 |
| July 2026 | 31 | 30 | 93.3% | 1 |