Flight number record

F9 3976

Frontier Airlines · Atlanta to Orlando

Route: ATL → MCO
Departs: 12:39
Flights: 290
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s F9 3976, check with Frontier Airlines.

F9 3976 draws a D. 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 290 flights, with a median arrival 2 minutes late.

The national on-time rate over the same period is 77.6%, so F9 3976 runs 14 points behind the country as a whole. Across a thousand flights that is about 136 extra late arrivals.

On time

64.0%

Arrivals under 15 minutes late, of 283 completed flights

Avg delay

109 min

Across delayed arrivals only, not all flights

Cancelled

2.41%

National rate is 1.81%

1 hour+ late

19.1%

National rate is 8.1%

These figures cover 290 flights between July 2025 and June 2026. Beyond the headline rate, 19.1% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

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 290 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 12:3935 flights12.1%

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 12:39 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and F9 3976 runs 15 points worse at 64.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

F9 3976 next to ATL to MCO

Every carrier on ATL to MCO combined arrived on time 70.7% of the time across 8,211 flights, so F9 3976 is 7 points behind it. Frontier flew 1,181 flights on the same city pair under all its flight numbers, including this one, and those ran 65.6% on time. Across its whole network Frontier Airlines managed 73.2%, which this flight trails by 9 points.

F9 3976 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 3976thin sample	290	64.0%	109 min	2.41%	D
All Frontier Airlines on ATL–MCO	1,181	65.6%	112 min	1.61%	C
All carriers on ATL–MCO	8,211	70.7%	73 min	1.36%	C
Frontier Airlines, whole network	205,332	73.2%	84 min	1.85%	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 2025 at 45.1%, a swing of 38 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 202552 flights45.1%
Oct–Dec 202580 flights64.1%
Jan–Mar 202679 flights57.7%
Apr–Jun 202679 flights82.9%

Scale runs 35% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, F9 3976 did best on Thursday at 78.0% on time and worst on Sunday at 44.0%. Each day rests on about 41 flights, so a gap of 34 points is worth noticing but could still narrow in another year.

Delay causes

Why F9 3976 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 46% of the 11,000 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.

Late-arriving aircraft
46%
Carrier
30%
National Airspace System
24%

46% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 11,000 reported delay minutes here, that single category outweighs weather by 46 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 11,093 delay minutes reported on F9 3976.

Cancellations sit at 2.41% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 19.1% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

Every one of the 290 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. 290 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, F9 3976 is a flight to put a long connection behind. 19.1% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures