YX4500
YX4500 (Republic Airways) is a multi-stop service on 21 routes, busiest Boston to St Louis. Of 544 departures recorded from October 2024 to July 2026, 84.4% left on time, according to the US BTS.
- On-time departures84.4%of 544 flights
- Average delay7.6 min
- July 202662
- Cancelled2.0%
- 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 periods16 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 21 | 30 | ▲ 42.9% |
| February | 10 | 25 | ▲ 150.0% |
| March | 27 | 27 | 0.0% |
| April | 26 | 53 | ▲ 103.8% |
| May | 4 | 62 | ▲ 1,450.0% |
| June | 28 | 52 | ▲ 85.7% |
| July | – | 62 | – |
| August | – | – | – |
| September | – | – | – |
| October | 26 | – | in progress |
| November | 30 | – | – |
| December | 16 | – | – |
according to the US BTS · October 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 periods16 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 94.4% | 92.9% | ▼ 1.7% |
| February | 90.0% | 82.6% | ▼ 8.2% |
| March | 77.8% | 60.0% | ▼ 22.9% |
| April | 73.1% | 64.2% | ▼ 12.2% |
| May | 75.0% | 90.3% | ▲ 20.4% |
| June | 75.0% | 86.5% | ▲ 15.4% |
| July | – | 86.9% | – |
| August | – | – | – |
| September | – | – | – |
| October | 96.2% | – | in progress |
| November | 93.3% | – | – |
| December | 100.0% | – | – |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods16 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 3 | 2 | ▼ 33.3% |
| February | 0 | 2 | – |
| March | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | – | 1 | – |
| August | – | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
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 98.0% 533
- Cancelled 2.0% 11
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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BOS STL Boston Logan International Airport – St. Louis Lambert International Airport | 1,680 | -1.8 min | 92.6% | 115 |
| RIC ORD Richmond International Airport – Chicago O'Hare International Airport | 1,032 | 24.5 min | 77.6% | 68 |
| ORD RIC Chicago O'Hare International Airport – Richmond International Airport | 1,032 | -0.2 min | 92.7% | 68 |
| BUF BOS Buffalo Niagara International Airport – Boston Logan International Airport | 635 | 10.3 min | 79.6% | 44 |
| BOS BUF Boston Logan International Airport – Buffalo Niagara International Airport | 635 | 5.7 min | 79.6% | 44 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 100.0% | 0 |
| November 2024 | 5 | 5 | 100.0% | 0 |
| December 2024 | 20 | 20 | 95.0% | 0 |
| January 2025 | 21 | 18 | 94.4% | 3 |
| February 2025 | 10 | 10 | 90.0% | 0 |
| March 2025 | 27 | 27 | 77.8% | 0 |
| April 2025 | 26 | 26 | 73.1% | 0 |
| May 2025 | 4 | 4 | 75.0% | 0 |
| June 2025 | 28 | 28 | 75.0% | 0 |
| October 2025 | 26 | 26 | 96.2% | 0 |
| November 2025 | 30 | 30 | 93.3% | 0 |
| December 2025 | 16 | 15 | 100.0% | 1 |
| January 2026 | 30 | 28 | 92.9% | 2 |
| February 2026 | 25 | 23 | 82.6% | 2 |
| March 2026 | 27 | 25 | 60.0% | 2 |
| April 2026 | 53 | 53 | 64.2% | 0 |
| May 2026 | 62 | 62 | 90.3% | 0 |
| June 2026 | 52 | 52 | 86.5% | 0 |
| July 2026 | 62 | 61 | 86.9% | 1 |