Flight number record

MQ 4321

Envoy Air · Chicago to Waterloo

Route: ORD → ALO
Departs: 22:34
Flights: 329
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s MQ 4321, 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 4321 sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 329 flights, with a median arrival 2 minutes early.

The national on-time rate over the same period is 77.6%, so MQ 4321 runs 9 points behind the country as a whole. Across a thousand flights that is about 88 extra late arrivals.

On time

68.8%

Arrivals under 15 minutes late, of 311 completed flights

Avg delay

81 min

Across delayed arrivals only, not all flights

Cancelled

4.26%

National rate is 1.81%

1 hour+ late

15.1%

National rate is 8.1%

These figures cover 329 flights between July 2025 and June 2026. Beyond the headline rate, 15.1% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When MQ 4321 flies

MQ 4321 flies ORD to ALO without a single fixed slot. Its most common scheduled departure was 22:34, used on 54 of 329 flights, with 22:27 (46 flights) and 22:19 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 22:3454 flights16.4%
Departs 22:2746 flights14.0%
Departs 22:1937 flights11.2%

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 22:34 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and MQ 4321 runs level with that at 68.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

MQ 4321 next to ORD to ALO

Every carrier on ORD to ALO combined arrived on time 73.2% of the time across 663 flights, so MQ 4321 is 4 points behind it. Envoy flew 616 flights on the same city pair under all its flight numbers, including this one, and those ran 73.7% on time. Across its whole network Envoy Air managed 80.2%, which this flight trails by 11 points.

MQ 4321 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
MQ 4321thin sample	329	68.8%	81 min	4.26%	C−
All Envoy Air on ORD–ALO	616	73.7%	79 min	2.60%	C
All carriers on ORD–ALO	663	73.2%	86 min	3.32%	C−
Envoy Air, whole network	315,435	80.2%	67 min	2.30%	B

Across the year

MQ 4321 quarter by quarter

Quarter by quarter MQ 4321 held fairly steady: 69.8% in Jul–Sep 2025, 70.0% in Oct–Dec 2025, 69.8% in Jan–Mar 2026 and 64.4% in Apr–Jun 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202589 flights69.8%
Oct–Dec 202588 flights70.0%
Jan–Mar 202689 flights69.8%
Apr–Jun 202663 flights64.4%

Scale runs 55% to 75%. Rows with fewer than 30 flights show a dash.

By weekday, MQ 4321 did best on Saturday at 79.5% on time and worst on Wednesday at 60.0%. Each day rests on about 47 flights, so a gap of 20 points is worth noticing but could still narrow in another year.

Delay causes

Why MQ 4321 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 7,813 reported delay minutes.

Late-arriving aircraft
39%
Extreme weather
26%
National Airspace System
22%
Carrier
13%

Extreme weather accounts for 26% 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 4.2 times the usual weather exposure. The split is drawn from 7,813 delay minutes reported on MQ 4321.

Cancellations run at 4.26%, against 1.81% nationally. That is about one flight in 25 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 15.1% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

The same number turns up on one other city pair in the data, including ORD to MSN (27), but none flew often enough under MQ 4321 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to ALO only.

One caution: this is a thin sample. 329 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 4321

For a booking, the cancellation rate is the figure to plan around on MQ 4321: 4.26% of its 329 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.

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