Flight profile · Envoy Air
MQ4129
Springfield (SGF) to Chicago (ORD) · scheduled 6:00 AM – 7:10 AM
How MQ4129 performs
1,023 operations, 2023-07-01 to 2026-06-30.
MQ4129 arrived on time 82.3% of the time, against 74.5% for all SGF → ORD flights — this specific departure is 7.8 percentage points better than the route as a whole. Against Envoy Air’s own flights on this route it is 6.8 points better.
Source: US DOT Bureau of Transportation Statistics · 1,023 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| MQ4129 | 82.3% | 0.78% | -10 min | 8.2% | 1,023 |
| Envoy Air on SGF → ORD | 75.5% | 1.31% | -5 min | 10.2% | 2,515 |
| All SGF → ORD flights | 74.5% | 1.57% | -4 min | 11.1% | 4,701 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does MQ4129 run worse on particular days?
Tuesday is historically the most reliable day and Sunday the least, a gap of 6.8 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Other routes MQ4129 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| BOS→MIA Boston to Miami | 2025-02-15 – 2025-03-01 | 3 | — |
Because the same number has served different journeys, the statistics above describe only the route MQ4129 currently operates. Blending them would produce an average of two different flights.
Why MQ4129 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding, fuelling — within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for MQ4129 on SGF → ORD. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Other departures on SGF → ORD
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| OO5585 | SkyWest Airlines | 80.7% | 5 min early | 614 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 1,023 records of MQ4129 operating SGF → ORD, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Report a problem
Analysis last recomputed