Flight number record
MQ 3638
Envoy Air · Cincinnati to Miami
- Route
- CVG → MIA
- Departs
- 08:41
- Flights
- 333
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s MQ 3638, 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 3638 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 333 flights, with a median arrival 6 minutes early.
Set against the rest of the country, MQ 3638's record is 9 points better than the US average of 77.3%. That gap is worth roughly 88 fewer late arrivals for every thousand flights.
Key figures
On time
86.1%
Arrivals under 15 minutes late, of 331 completed flights
Avg delay
60 min
Across delayed arrivals only, not all flights
Cancelled
0.60%
National rate is 1.89%
1 hour+ late
3.6%
National rate is 8.3%
These figures cover 333 flights between September 2025 and August 2026. The median arrival is 6 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 3638 flies
MQ 3638 flies CVG to MIA without a single fixed slot. Its most common scheduled departure was 08:41, used on 45 of 333 flights, with 07:15 (43 flights) and 08:28 (37 flights) next.
- Departs 08:4145 flights13.5%
- Departs 07:1543 flights12.9%
- Departs 08:2837 flights11.1%
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 08:41 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and MQ 3638 runs 2 points better at 86.1%. 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 3638 next to CVG to MIA
Every carrier on CVG to MIA combined arrived on time 81.6% of the time across 989 flights, so MQ 3638 is 5 points ahead of it. Envoy flew 795 flights on the same city pair under all its flight numbers, including this one, and those ran 83.8% on time. Across its whole network Envoy Air managed 81.0%, which this flight beats by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| MQ 3638thin sample | 333 | 86.1% | 60 min | 0.60% | A+ |
| All Envoy Air on CVG–MIA | 795 | 83.8% | 53 min | 0.63% | B+ |
| All carriers on CVG–MIA | 989 | 81.6% | 64 min | 0.81% | B+ |
| Envoy Air, whole network | 320,362 | 81.0% | 70 min | 2.19% | B |
Across the year
MQ 3638 quarter by quarter
MQ 3638 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Oct–Dec 2025 at 82.4%, a swing of 11 points on roughly 67 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 202591 flights82.4%
- Jan–Mar 202666 flights82.8%
- Apr–Jun 202691 flights91.2%
- Jul–Sep 202655 flights83.6%
Scale runs 75% to 100%.
By weekday, MQ 3638 did best on Wednesday at 93.3% on time and worst on Friday at 81.2%. Each day rests on about 48 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late MQ 3638 runs when it is late
MQ 3638 often beats the schedule: 87 of 331 completed flights, 26%, arrived 15 minutes or more early. The 46 late arrivals split 20 under half an hour, 14 between 30 and 60 minutes, and 12 an hour or more.
- 15+ min early87 flights26.3%
- Within 15 min198 flights59.8%
- 15–29 min late20 flights6.0%
- 30–59 min late14 flights4.2%
- 1–2 hours late6 flights1.8%
- 2+ hours late6 flights1.8%
Scale runs 0% to 100%.
Share of 331 completed flights by arrival against schedule.
A late pushback is often recovered here: of 43 departures that left 15 minutes late or more, 13 still arrived on time. 16 flights left on time and still arrived late.
The worst days
Worst days for MQ 3638
The latest arrival of the period was on 29 March 2026, 4 hours 40 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 29 March 2026 | 4 hours 40 minutes | Carrier |
| 3 August 2026 | 4 hours 7 minutes | Carrier |
| 3 December 2025 | 3 hours 13 minutes | Carrier |
| 15 August 2026 | 3 hours 2 minutes | Carrier |
| 3 November 2025 | 2 hours 56 minutes | Carrier |
Delay causes
Why MQ 3638 runs late
Carrier accounts for 72% of the 2,735 delay minutes carriers reported here, and the remaining four split what is left.
- 72%Carrier
- 24%National Airspace System
- 4%Extreme weather
The largest share of delay minutes, 72%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,974 of the 2,735 delay minutes reported here. The split is drawn from 2,735 delay minutes reported on MQ 3638.
Cancellations are rare at 0.60%, 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 948 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 333 flights under MQ 3638 in the data flew CVG 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. 333 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 3638
For a booking, MQ 3638 has one of the better records a US domestic flight can show: 86.1% on time and 0.60% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- CVG to MIA, every carrier and departure
- MIA to CVG, the return direction
- Cincinnati/Northern Kentucky International (CVG) delay statistics
- 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.