Flight number record
MQ 3427
Envoy Air · Miami to Birmingham
- Route
- MIA → BHM
- Departs
- 22:55
- Flights
- 308
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s MQ 3427, 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 3427 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 50 minutes. That rests on 308 flights, with a median arrival 5 minutes early.
Set against the rest of the country, MQ 3427's record is 7 points better than the US average of 77.3%. That gap is worth roughly 71 fewer late arrivals for every thousand flights.
Key figures
On time
84.4%
Arrivals under 15 minutes late, of 307 completed flights
Avg delay
49 min
Across delayed arrivals only, not all flights
Cancelled
0.32%
National rate is 1.89%
1 hour+ late
3.6%
National rate is 8.3%
These figures cover 308 flights between September 2025 and August 2026. The median arrival is 5 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.
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Schedule
When MQ 3427 flies
MQ 3427 flies MIA to BHM without a single fixed slot. Its most common scheduled departure was 22:55, used on 90 of 308 flights, with 22:56 (58 flights) and 22:49 (44 flights) next.
- Departs 22:5590 flights29.2%
- Departs 22:5658 flights18.8%
- Departs 22:4944 flights14.3%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 22:55 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and MQ 3427 runs 14 points better at 84.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
MQ 3427 next to MIA to BHM
Every carrier on MIA to BHM combined arrived on time 82.7% of the time across 617 flights, so MQ 3427 is 2 points ahead of it. Envoy flew 606 flights on the same city pair under all its flight numbers, including this one, and those ran 82.7% on time. Across its whole network Envoy Air managed 81.0%, which this flight beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| MQ 3427thin sample | 308 | 84.4% | 49 min | 0.32% | B+ |
| All Envoy Air on MIA–BHM | 606 | 82.7% | 45 min | 0.66% | B+ |
| All carriers on MIA–BHM | 617 | 82.7% | 45 min | 0.65% | B+ |
| Envoy Air, whole network | 320,362 | 81.0% | 70 min | 2.19% | B |
Across the year
MQ 3427 quarter by quarter
MQ 3427 did not run the same all year. Its best quarter was Jul–Sep 2025 at 100.0% on time and its weakest Jan–Mar 2026 at 75.6%, a swing of 24 points on roughly 62 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 202530 flights100.0%
- Oct–Dec 202579 flights88.5%
- Jan–Mar 202690 flights75.6%
- Apr–Jun 202647 flights76.6%
- Jul–Sep 202662 flights90.3%
Scale runs 65% to 100%.
By weekday, MQ 3427 did best on Thursday at 93.2% on time and worst on Friday at 75.6%. Each day rests on about 44 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late MQ 3427 runs when it is late
MQ 3427 often beats the schedule: 78 of 307 completed flights, 25%, arrived 15 minutes or more early. The 48 late arrivals split 21 under half an hour, 16 between 30 and 60 minutes, and 11 an hour or more.
- 15+ min early78 flights25.4%
- Within 15 min181 flights59.0%
- 15–29 min late21 flights6.8%
- 30–59 min late16 flights5.2%
- 1–2 hours late10 flights3.3%
- 2+ hours late1 flights0.3%
Scale runs 0% to 100%.
Share of 307 completed flights by arrival against schedule.
9 of 41 late departures made up the time and arrived on time, 22% of them. In the other direction, 16 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at BHM.
The worst days
Worst days for MQ 3427
The latest arrival of the period was on 12 November 2025, 8 hours behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 12 November 2025 | 8 hours | Carrier |
| 1 July 2026 | 1 hour 56 minutes | Carrier |
| 17 July 2026 | 1 hour 33 minutes | Late-arriving aircraft |
| 23 June 2026 | 1 hour 27 minutes | Late-arriving aircraft |
| 20 June 2026 | 1 hour 24 minutes | Late-arriving aircraft |
Delay causes
Why MQ 3427 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 2,355 reported delay minutes.
- 40%Carrier
- 35%Late-arriving aircraft
- 23%National Airspace System
- 2%Extreme weather
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,355 reported delay minutes here, that single category outweighs weather by 19 to one. The split is drawn from 2,355 delay minutes reported on MQ 3427.
Cancellations are rare at 0.32%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.6% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 661 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.
The same number turns up on two other city pairs in the data, including BNA to ORD (44) and ORD to BNA (44), but none flew often enough under MQ 3427 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to MIA to BHM only.
One caution: this is a thin sample. 308 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 3427
For a booking, read MQ 3427 as 84.4% on time with 0.32% cancelled over 308 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- Miami International (MIA) delay statistics
- Envoy Air on-time record
- Every Envoy Air flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.