Flight number record
MQ 3423
Envoy Air · Birmingham to Miami
- Route
- BHM → MIA
- Departs
- 06:00
- Flights
- 365
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s MQ 3423, 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 3423 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 13 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 365 flights, with a median arrival 8 minutes early.
Set against the rest of the country, MQ 3423's record is 13 points better than the US average of 77.6%. That gap is worth roughly 125 fewer late arrivals for every thousand flights.
Key figures
On time
90.1%
Arrivals under 15 minutes late, of 364 completed flights
Avg delay
60 min
Across delayed arrivals only, not all flights
Cancelled
0.27%
National rate is 1.81%
1 hour+ late
3.3%
National rate is 8.1%
These figures cover 365 flights between July 2025 and June 2026. The median arrival is 8 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 3423 flies
MQ 3423 flies BHM to MIA without a single fixed slot. Its most common scheduled departure was 06:00, used on 210 of 365 flights, with 06:10 (74 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 06:00210 flights57.5%
- Departs 06:1074 flights20.3%
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 3423 runs level with that at 90.1%. 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 3423 next to BHM to MIA
Every carrier on BHM to MIA combined arrived on time 85.4% of the time across 679 flights, so MQ 3423 is 5 points ahead of it. Envoy flew 667 flights on the same city pair under all its flight numbers, including this one, and those ran 85.6% on time. Across its whole network Envoy Air managed 80.2%, which this flight beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| MQ 3423 | 365 | 90.1% | 60 min | 0.27% | A+ |
| All Envoy Air on BHM–MIA | 667 | 85.6% | 58 min | 0.60% | A+ |
| All carriers on BHM–MIA | 679 | 85.4% | 61 min | 0.59% | A+ |
| Envoy Air, whole network | 315,435 | 80.2% | 67 min | 2.30% | B |
Across the year
MQ 3423 quarter by quarter
Quarter by quarter MQ 3423 held fairly steady: 89.1% in Jul–Sep 2025, 93.4% in Oct–Dec 2025, 90.0% in Jan–Mar 2026 and 87.9% 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 202592 flights89.1%
- Oct–Dec 202592 flights93.4%
- Jan–Mar 202690 flights90.0%
- Apr–Jun 202691 flights87.9%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, MQ 3423 ranged from 84.6% on Saturday to 96.2% on Friday. With about 52 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 3423 runs late
One category carries most of the weight here. Carrier accounts for 69% of the 2,149 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.
- 69%Carrier
- 15%National Airspace System
- 8%Late-arriving aircraft
- 7%Extreme weather
The largest share of delay minutes, 69%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,488 of the 2,149 delay minutes reported here. The split is drawn from 2,149 delay minutes reported on MQ 3423.
Cancellations are rare at 0.27%, below the national 1.81% 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 3.3% land an hour or more behind schedule, against 8.1% 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. 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 365 flights under MQ 3423 in the data flew BHM to MIA. 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. 365 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 3423
For a booking, MQ 3423 has one of the better records a US domestic flight can show: 90.1% on time and 0.27% cancelled. That is a base rate, not a promise about any single 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
- Worst months to fly in the US, ranked by the data
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.