Flight number record
F9 3976
Frontier Airlines · Atlanta to Orlando
- Route
- ATL → MCO
- Departs
- 12:39
- Flights
- 291
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 3976, check with Frontier Airlines.
F9 3976 draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is close to two hours behind schedule. Build slack into anything you connect to. That rests on 291 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.3%, so F9 3976 runs 10 points behind the country as a whole. Across a thousand flights that is about 104 extra late arrivals.
Key figures
On time
66.9%
Arrivals under 15 minutes late, of 281 completed flights
Avg delay
103 min
Across delayed arrivals only, not all flights
Cancelled
2.75%
National rate is 1.89%
1 hour+ late
16.7%
National rate is 8.3%
These figures cover 291 flights between September 2025 and August 2026. Beyond the headline rate, 16.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 3976 flies
F9 3976 flies ATL to MCO without a single fixed slot. Its most common scheduled departure was 12:39, used on 35 of 291 flights, with 12:42 (30 flights) next.
- Departs 12:3935 flights12.0%
- Departs 12:4230 flights10.3%
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 12:39 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and F9 3976 runs 11 points worse at 66.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
F9 3976 next to ATL to MCO
Every carrier on ATL to MCO combined arrived on time 70.3% of the time across 8,267 flights, so F9 3976 is 3 points behind it. Frontier flew 1,270 flights on the same city pair under all its flight numbers, including this one, and those ran 64.8% on time. Across its whole network Frontier Airlines managed 72.7%, which this flight trails by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 3976thin sample | 291 | 66.9% | 103 min | 2.75% | C |
| All Frontier Airlines on ATL–MCO | 1,270 | 64.8% | 117 min | 2.20% | D |
| All carriers on ATL–MCO | 8,267 | 70.3% | 75 min | 1.58% | C |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 3976 quarter by quarter
F9 3976 did not run the same all year. Its best quarter was Apr–Jun 2026 at 82.9% on time and its weakest Jul–Sep 2026 at 56.2%, a swing of 27 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 202517 flights—
- Oct–Dec 202580 flights64.1%
- Jan–Mar 202679 flights57.7%
- Apr–Jun 202679 flights82.9%
- Jul–Sep 202636 flights56.2%
Scale runs 50% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, F9 3976 did best on Thursday at 79.6% on time and worst on Sunday at 49.0%. Each day rests on about 42 flights, so a gap of 31 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 3976 runs when it is late
When F9 3976 is late it tends to be very late: 47 of its 93 late arrivals were an hour or more behind, and 24 were two hours or more.
- 15+ min early57 flights20.3%
- Within 15 min131 flights46.6%
- 15–29 min late21 flights7.5%
- 30–59 min late25 flights8.9%
- 1–2 hours late23 flights8.2%
- 2+ hours late24 flights8.5%
Scale runs 0% to 100%.
Share of 281 completed flights by arrival against schedule.
23 of 107 late departures made up the time and arrived on time, 21% of them. 9 flights left on time and still arrived late.
The worst days
Worst days for F9 3976
The latest arrival of the period was on 20 August 2026, 12 hours 15 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across August, November and October, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 20 August 2026 | 12 hours 15 minutes | Late-arriving aircraft |
| 2 August 2026 | 11 hours 30 minutes | Carrier |
| 11 November 2025 | 8 hours 8 minutes | National Airspace System |
| 12 November 2025 | 8 hours 2 minutes | National Airspace System |
| 20 October 2025 | 6 hours 19 minutes | Late-arriving aircraft |
Delay causes
Why F9 3976 runs late
Late-arriving aircraft accounts for 55% of the 9,582 delay minutes carriers reported here, and the remaining four split what is left.
- 55%Late-arriving aircraft
- 24%Carrier
- 21%National Airspace System
55% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 9,582 reported delay minutes here, that single category outweighs weather by 55 to one. The split is drawn from 9,582 delay minutes reported on F9 3976.
Cancellations run at 2.75%, against 1.89% nationally. That is roughly one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
16.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
Every one of the 291 flights under F9 3976 in the data flew ATL to MCO. 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. 291 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 F9 3976
For a booking, the cancellation rate is the figure to plan around on F9 3976: 2.75% of its 291 scheduled flights did not operate. A late arrival costs close to two hours, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ATL to MCO, every carrier and departure
- MCO to ATL, the return direction
- Delta Air Lines 1658 on the same route83.4%
- Delta Air Lines 1030 on the same route80.2%
- Delta Air Lines 1213 on the same route86.9%
- Delta Air Lines 1497 on the same route57.1%
- Delta Air Lines 1742 on the same route55.5%
- Delta Air Lines 664 on the same route84.0%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Orlando International (MCO) delay statistics
- Frontier Airlines on-time record
- Every Frontier Airlines 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 Frontier Airlines’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.