Flight number record

MQ 3937

Envoy Air · Dallas-Fort Worth to Billings

Route: DFW → BIL
Departs: 19:14
Flights: 326
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s MQ 3937, 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 3937 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.6%. The late ones land roughly 50 minutes behind schedule. That rests on 326 flights, with a median arrival 4 minutes early.

On time

73.8%

Arrivals under 15 minutes late, of 321 completed flights

Avg delay

52 min

Across delayed arrivals only, not all flights

Cancelled

1.23%

National rate is 1.81%

1 hour+ late

7.2%

National rate is 8.1%

These figures cover 326 flights between July 2025 and June 2026. The median arrival is 4 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 3937 flies

MQ 3937 flies DFW to BIL without a single fixed slot. Its most common scheduled departure was 19:14, used on 45 of 326 flights, with 20:41 (44 flights) and 21:15 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 19:1445 flights13.8%
Departs 20:4144 flights13.5%
Departs 21:1541 flights12.6%

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 19:14 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and MQ 3937 runs 6 points better at 73.8%. 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 3937 next to DFW to BIL

Every carrier on DFW to BIL combined arrived on time 78.7% of the time across 691 flights, so MQ 3937 is 5 points behind it. Across its whole network Envoy Air managed 80.2%, which this flight trails by 6 points.

MQ 3937 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
MQ 3937thin sample	326	73.8%	52 min	1.23%	C
All Envoy Air on DFW–BIL	691	78.7%	53 min	0.72%	B+
All carriers on DFW–BIL	691	78.7%	53 min	0.72%	B+
Envoy Air, whole network	315,435	80.2%	67 min	2.30%	B

Across the year

MQ 3937 quarter by quarter

MQ 3937 did not run the same all year. Its best quarter was Jan–Mar 2026 at 80.8% on time and its weakest Jul–Sep 2025 at 65.2%, a swing of 16 points on roughly 82 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 202592 flights65.2%
Oct–Dec 202591 flights77.8%
Jan–Mar 202652 flights80.8%
Apr–Jun 202691 flights74.4%

Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, MQ 3937 did best on Monday at 82.2% on time and worst on Sunday at 66.0%. Each day rests on about 47 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why MQ 3937 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 53% of the 4,398 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
53%
National Airspace System
24%
Carrier
12%
Extreme weather
12%

Extreme weather accounts for 12% 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 1.9 times the usual weather exposure. The split is drawn from 4,398 delay minutes reported on MQ 3937.

Cancellations sit at 1.23% against a national 1.81%, which is ordinary. Diversions add another 0.31%.

Connections and routes

What a delay on this flight costs

7.2% 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 roughly 50 minutes, which a normal layover absorbs.

The 1,081 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 326 flights under MQ 3937 in the data flew DFW to BIL. 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. 326 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 3937

For a booking, read MQ 3937 as 73.8% on time with 1.23% cancelled over 326 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