MQ4181
MQ4181 (Envoy Air) is a multi-stop service on 13 routes, busiest Birmingham to Chicago. Of 611 departures recorded from March 2025 to July 2026, 83.8% left on time, according to the US BTS.
- On-time departures83.8%of 611 flights
- Average delay10.6 min
- July 202631▲ 0.0%vs July 2025
- Cancelled2.1%
- Legs flown under this number13
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | – | 10 | – |
| February | – | 16 | – |
| March | 52 | 46 | ▼ 11.5% |
| April | 33 | 60 | ▲ 81.8% |
| May | 57 | 50 | ▼ 12.3% |
| June | 33 | 30 | ▼ 9.1% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 5 | – | in progress |
| November | 44 | – | – |
| December | 52 | – | – |
according to the US BTS · March 2025 → 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 periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | – | 80.0% | – |
| February | – | 100.0% | – |
| March | 64.6% | 84.8% | ▲ 31.3% |
| April | 87.9% | 98.3% | ▲ 11.8% |
| May | 93.0% | 85.7% | ▼ 7.8% |
| June | 84.9% | 76.7% | ▼ 9.6% |
| July | 96.8% | 90.0% | ▼ 7.0% |
| August | 83.9% | – | – |
| September | 86.2% | – | – |
| October | 100.0% | – | in progress |
| November | 66.7% | – | – |
| December | 68.0% | – | – |
according to the US BTS · March 2025 → July 2026
Average departure delay by month
according to the US BTS · March 2025 → July 2026
Cancelled departures by month
The most recent periods17 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | – | 0 | – |
| February | – | 0 | – |
| March | 4 | 0 | ▼ 100.0% |
| April | 0 | 2 | – |
| May | 0 | 1 | – |
| June | 0 | 0 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 1 | – | – |
| October | 0 | – | in progress |
| November | 2 | – | – |
| December | 2 | – | – |
according to the US BTS · March 2025 → 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 97.9% 598
- Cancelled 2.1% 13
Share of all recorded flights in the period, all legs. · Mar 6, 2025 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
11Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| March 2025 | 52 | 48 | 64.6% | 4 |
| April 2025 | 33 | 33 | 87.9% | 0 |
| May 2025 | 57 | 57 | 93.0% | 0 |
| June 2025 | 33 | 33 | 84.9% | 0 |
| July 2025 | 31 | 31 | 96.8% | 0 |
| August 2025 | 31 | 31 | 83.9% | 0 |
| September 2025 | 30 | 29 | 86.2% | 1 |
| October 2025 | 5 | 5 | 100.0% | 0 |
| November 2025 | 44 | 42 | 66.7% | 2 |
| December 2025 | 52 | 50 | 68.0% | 2 |
| January 2026 | 10 | 10 | 80.0% | 0 |
| February 2026 | 16 | 16 | 100.0% | 0 |
| March 2026 | 46 | 46 | 84.8% | 0 |
| April 2026 | 60 | 58 | 98.3% | 2 |
| May 2026 | 50 | 49 | 85.7% | 1 |
| June 2026 | 30 | 30 | 76.7% | 0 |
| July 2026 | 31 | 30 | 90.0% | 1 |