YX4391
YX4391 (Republic Airways) is a multi-stop service on 21 routes, busiest Portland to Chicago. Of 571 departures recorded from November 2024 to July 2026, 86.8% left on time, according to the US BTS.
- On-time departures86.8%of 571 flights
- Average delay7.3 min
- July 202631▲ 19.2%vs July 2025
- Cancelled3.5%
- Legs flown under this number21
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 50 | 16 | ▼ 68.0% |
| February | 28 | 21 | ▼ 25.0% |
| March | 32 | 31 | ▼ 3.1% |
| April | 30 | 48 | ▲ 60.0% |
| May | 8 | 20 | ▲ 150.0% |
| June | – | 30 | – |
| July | 26 | 31 | ▲ 19.2% |
| August | 35 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 21 | – | – |
| December | 20 | – | – |
according to the US BTS · November 2024 → July 2026
On-time departures by month
Months without data are left blank.
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 84.1% | 100.0% | ▲ 18.9% |
| February | 89.3% | 94.4% | ▲ 5.8% |
| March | 90.3% | 93.6% | ▲ 3.6% |
| April | 93.3% | 72.9% | ▼ 21.9% |
| May | 87.5% | 80.0% | ▼ 8.6% |
| June | – | 96.3% | – |
| July | 92.0% | 86.7% | ▼ 5.8% |
| August | 82.9% | – | – |
| September | 86.7% | – | – |
| October | 87.1% | – | in progress |
| November | 71.4% | – | – |
| December | 72.2% | – | – |
according to the US BTS · November 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · November 2024 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 6 | 3 | ▼ 50.0% |
| February | 0 | 3 | – |
| March | 1 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | – | 3 | – |
| July | 1 | 1 | 0.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 2 | – | – |
according to the US BTS · November 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% 551
- Cancelled 3.5% 20
Share of all recorded flights in the period, all legs. · Nov 5, 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 |
|---|---|---|---|---|
| PWM ORD Portland International Jetport – Chicago O'Hare International Airport | 1,444 | 11.0 min | 89.2% | 162 |
| DCA PVD Ronald Reagan Washington National Airport – Rhode Island T. F. Green International Airport | 573 | -0.2 min | 91.7% | 84 |
| PVD DCA Rhode Island T. F. Green International Airport – Ronald Reagan Washington National Airport | 573 | 6.1 min | 81.5% | 82 |
| ORD MSY Chicago O'Hare International Airport – Louis Armstrong New Orleans International Airport | 1,349 | -0.7 min | 92.3% | 42 |
| MSY ORD Louis Armstrong New Orleans International Airport – Chicago O'Hare International Airport | 1,349 | 13.0 min | 82.1% | 42 |
| BOS DCA Boston Logan International Airport – Ronald Reagan Washington National Airport | 641 | -0.7 min | 90.0% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| November 2024 | 43 | 43 | 95.4% | 0 |
| December 2024 | 20 | 20 | 85.0% | 0 |
| January 2025 | 50 | 44 | 84.1% | 6 |
| February 2025 | 28 | 28 | 89.3% | 0 |
| March 2025 | 32 | 31 | 90.3% | 1 |
| April 2025 | 30 | 30 | 93.3% | 0 |
| May 2025 | 8 | 8 | 87.5% | 0 |
| July 2025 | 26 | 25 | 92.0% | 1 |
| August 2025 | 35 | 35 | 82.9% | 0 |
| September 2025 | 30 | 30 | 86.7% | 0 |
| October 2025 | 31 | 31 | 87.1% | 0 |
| November 2025 | 21 | 21 | 71.4% | 0 |
| December 2025 | 20 | 18 | 72.2% | 2 |
| January 2026 | 16 | 13 | 100.0% | 3 |
| February 2026 | 21 | 18 | 94.4% | 3 |
| March 2026 | 31 | 31 | 93.6% | 0 |
| April 2026 | 48 | 48 | 72.9% | 0 |
| May 2026 | 20 | 20 | 80.0% | 0 |
| June 2026 | 30 | 27 | 96.3% | 3 |
| July 2026 | 31 | 30 | 86.7% | 1 |