Flight number record
MQ 3423
Envoy Air · Birmingham to Miami
- Route
- BHM → MIA
- Departs
- 06:00
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over 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 11 points better than the US average of 77.3%. That gap is worth roughly 114 fewer late arrivals for every thousand flights.
Key figures
On time
88.7%
Arrivals under 15 minutes late, of 364 completed flights
Avg delay
74 min
Across delayed arrivals only, not all flights
Cancelled
0.27%
National rate is 1.89%
1 hour+ late
5.2%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 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.
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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 181 of 365 flights, with 06:10 (75 flights) and 06:05 (63 flights) next.
- Departs 06:00181 flights49.6%
- Departs 06:1075 flights20.5%
- Departs 06:0563 flights17.3%
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 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 88.7%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
MQ 3423 next to BHM to MIA
Every carrier on BHM to MIA combined arrived on time 84.5% of the time across 618 flights, so MQ 3423 is 4 points ahead of it. Envoy flew 607 flights on the same city pair under all its flight numbers, including this one, and those ran 84.4% on time. Across its whole network Envoy Air managed 81.0%, which this flight beats by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| MQ 3423 | 365 | 88.7% | 74 min | 0.27% | A+ |
| All Envoy Air on BHM–MIA | 607 | 84.4% | 59 min | 0.66% | B+ |
| All carriers on BHM–MIA | 618 | 84.5% | 58 min | 0.65% | B+ |
| Envoy Air, whole network | 320,362 | 81.0% | 70 min | 2.19% | B |
Across the year
MQ 3423 quarter by quarter
MQ 3423 did not run the same all year. Its best quarter was Oct–Dec 2025 at 93.4% on time and its weakest Jul–Sep 2026 at 79.0%, a swing of 14 points on roughly 73 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 flights93.3%
- Oct–Dec 202592 flights93.4%
- Jan–Mar 202690 flights90.0%
- Apr–Jun 202691 flights87.9%
- Jul–Sep 202662 flights79.0%
Scale runs 70% to 100%.
By weekday, MQ 3423 did best on Wednesday at 94.2% on time and worst on Saturday at 78.8%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late MQ 3423 runs when it is late
MQ 3423 often beats the schedule: 97 of 364 completed flights, 27%, arrived 15 minutes or more early. The 41 late arrivals split 10 under half an hour, 12 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early97 flights26.6%
- Within 15 min226 flights62.1%
- 15–29 min late10 flights2.7%
- 30–59 min late12 flights3.3%
- 1–2 hours late10 flights2.7%
- 2+ hours late9 flights2.5%
Scale runs 0% to 100%.
Share of 364 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 34 departures that left 15 minutes late or more, only 2 made it up before arrival. 9 flights left on time and still arrived late.
The worst days
Worst days for MQ 3423
The latest arrival of the period was on 20 June 2026, 3 hours 55 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 20 June 2026 | 3 hours 55 minutes | Carrier |
| 25 July 2026 | 3 hours 23 minutes | Carrier |
| 15 March 2026 | 2 hours 58 minutes | Late-arriving aircraft |
| 2 May 2026 | 2 hours 57 minutes | Carrier |
| 20 August 2026 | 2 hours 40 minutes | Carrier |
Delay causes
Why MQ 3423 runs late
Carrier accounts for 78% of the 3,044 delay minutes carriers reported here, and the remaining four split what is left.
- 78%Carrier
- 11%National Airspace System
- 6%Late-arriving aircraft
- 5%Extreme weather
The largest share of delay minutes, 78%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,375 of the 3,044 delay minutes reported here. The split is drawn from 3,044 delay minutes reported on MQ 3423.
Cancellations are rare at 0.27%, 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
5.2% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
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.
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: 88.7% 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.