Flight number record
MQ 4139
Envoy Air · Sarasota to Miami
- Route
- SRQ → MIA
- Departs
- 06:00
- Flights
- 301
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s MQ 4139, 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 4139 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 18 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 4.8 hours. That rests on 301 flights, with a median arrival 14 minutes early.
Set against the rest of the country, MQ 4139's record is 18 points better than the US average of 77.3%. That gap is worth roughly 180 fewer late arrivals for every thousand flights.
Key figures
On time
95.3%
Arrivals under 15 minutes late, of 301 completed flights
Avg delay
285 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
3.3%
National rate is 8.3%
These figures cover 301 flights between September 2025 and August 2026. The median arrival is 14 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 4139 flies
MQ 4139 flies SRQ to MIA without a single fixed slot. Its most common scheduled departure was 06:00, used on 180 of 301 flights, with 06:08 (42 flights) next.
- Departs 06:00180 flights59.8%
- Departs 06:0842 flights14.0%
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 4139 runs 6 points better at 95.3%. 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 4139 next to SRQ to MIA
Every carrier on SRQ to MIA combined arrived on time 93.8% of the time across 368 flights, so MQ 4139 is 2 points ahead of it. Across its whole network Envoy Air managed 81.0%, which this flight beats by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| MQ 4139thin sample | 301 | 95.3% | 285 min | 0.00% | A+ |
| All Envoy Air on SRQ–MIAthin sample | 356 | 94.7% | 222 min | 0.00% | A+ |
| All carriers on SRQ–MIA | 368 | 93.8% | 209 min | 0.00% | A+ |
| Envoy Air, whole network | 320,362 | 81.0% | 70 min | 2.19% | B |
Across the year
MQ 4139 quarter by quarter
Quarter by quarter MQ 4139 held fairly steady: 96.6% in Oct–Dec 2025, 96.7% in Jan–Mar 2026, 94.5% in Apr–Jun 2026 and 93.5% in Jul–Sep 2026. A spread of 3 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Oct–Dec 202558 flights96.6%
- Jan–Mar 202690 flights96.7%
- Apr–Jun 202691 flights94.5%
- Jul–Sep 202662 flights93.5%
Scale runs 85% to 100%.
By weekday, MQ 4139 ranged from 90.9% on Monday to 100.0% on Thursday. With about 43 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late MQ 4139 runs when it is late
MQ 4139 often beats the schedule: 138 of 301 completed flights, 46%, arrived 15 minutes or more early. When MQ 4139 is late it tends to be very late: 10 of its 14 late arrivals were an hour or more behind, and 8 were two hours or more.
- 15+ min early138 flights45.8%
- Within 15 min149 flights49.5%
- 15–29 min late1 flights0.3%
- 30–59 min late3 flights1.0%
- 1–2 hours late2 flights0.7%
- 2+ hours late8 flights2.7%
Scale runs 0% to 100%.
Share of 301 completed flights by arrival against schedule.
Only 15 of 301 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for MQ 4139
The latest arrival of the period was on 3 July 2026, 30 hours 7 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in July 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 July 2026 | 30 hours 7 minutes | Carrier |
| 22 May 2026 | 12 hours 11 minutes | Carrier |
| 8 June 2026 | 4 hours 39 minutes | Carrier |
| 20 July 2026 | 3 hours 57 minutes | Late-arriving aircraft |
| 4 July 2026 | 2 hours 36 minutes | Carrier |
Delay causes
Why MQ 4139 runs late
Carrier accounts for 87% of the 3,990 delay minutes carriers reported here, and the remaining four split what is left.
- 87%Carrier
- 6%Late-arriving aircraft
- 6%Extreme weather
- 1%National Airspace System
The largest share of delay minutes, 87%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,469 of the 3,990 delay minutes reported here. The split is drawn from 3,990 delay minutes reported on MQ 4139.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are 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 8.3% 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.
Every one of the 301 flights under MQ 4139 in the data flew SRQ 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. 301 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 4139
For a booking, MQ 4139 has one of the better records a US domestic flight can show: 95.3% on time and 0.00% 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.