Flight number record

MQ 4129

Envoy Air · Springfield to Chicago

Route: SGF → ORD
Departs: 06:00
Flights: 317
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s MQ 4129, check with Envoy Air. Envoy Air flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.

MQ 4129 lands a B, 5 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 317 flights, with a median arrival 10 minutes early.

Set against the rest of the country, MQ 4129's record is 5 points better than the US average of 77.6%. That gap is worth roughly 48 fewer late arrivals for every thousand flights.

On time

82.4%

Arrivals under 15 minutes late, of 312 completed flights

Avg delay

66 min

Across delayed arrivals only, not all flights

Cancelled

1.26%

National rate is 1.81%

1 hour+ late

6.4%

National rate is 8.1%

These figures cover 317 flights between July 2025 and June 2026. The median arrival is 10 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Schedule

When MQ 4129 flies

MQ 4129 flies SGF to ORD without a single fixed slot. Its most common scheduled departure was 06:00, used on 55 of 317 flights, with 07:00 (54 flights) and 05:19 (43 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:0055 flights17.4%
Departs 07:0054 flights17.0%
Departs 05:1943 flights13.6%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and MQ 4129 runs 7 points worse at 82.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

MQ 4129 next to SGF to ORD

Every carrier on SGF to ORD combined arrived on time 70.8% of the time across 1,437 flights, so MQ 4129 is 12 points ahead of it. Envoy flew 1,090 flights on the same city pair under all its flight numbers, including this one, and those ran 75.1% on time. Across its whole network Envoy Air managed 80.2%, which this flight beats by 2 points.

MQ 4129 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
MQ 4129thin sample	317	82.4%	66 min	1.26%	B
All Envoy Air on SGF–ORD	1,090	75.1%	76 min	2.02%	B
All carriers on SGF–ORD	1,437	70.8%	80 min	2.71%	C
Envoy Air, whole network	315,435	80.2%	67 min	2.30%	B

Across the year

MQ 4129 quarter by quarter

MQ 4129 did not run the same all year. Its best quarter was Jul–Sep 2025 at 89.3% on time and its weakest Jan–Mar 2026 at 73.8%, a swing of 16 points on roughly 79 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.

Jul–Sep 202584 flights89.3%
Oct–Dec 202586 flights79.5%
Jan–Mar 202663 flights73.8%
Apr–Jun 202684 flights84.5%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, MQ 4129 ranged from 76.0% on Sunday to 87.5% on Tuesday. With about 45 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why MQ 4129 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 3,620 reported delay minutes.

Carrier
36%
National Airspace System
30%
Late-arriving aircraft
21%
Extreme weather
13%
Security
1%

Extreme weather accounts for 13% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.1 times the usual weather exposure. The split is drawn from 3,620 delay minutes reported on MQ 4129.

Cancellations sit at 1.26% against a national 1.81%, which is ordinary. Diversions add another 0.32%.

Connections and routes

What a delay on this flight costs

6.4% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

Every one of the 317 flights under MQ 4129 in the data flew SGF to ORD. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 317 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.

What to do with this

Booking MQ 4129

For a booking, read MQ 4129 as 82.4% on time with 1.26% cancelled over 317 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

A flight number here means Envoy Air’s own number as it reports to the DOT. How the figures are computed is on the methodology page.

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures