Flight number record
F9 4036
Frontier Airlines · Atlanta to Cleveland
- Route
- ATL → CLE
- Departs
- 21:15
- Flights
- 269
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s F9 4036, check with Frontier Airlines.
F9 4036 draws a D−. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 269 flights, with a median arrival 6 minutes late.
The national on-time rate over the same period is 77.6%, so F9 4036 runs 17 points behind the country as a whole. Across a thousand flights that is about 170 extra late arrivals.
Key figures
On time
60.6%
Arrivals under 15 minutes late, of 259 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
3.35%
National rate is 1.81%
1 hour+ late
17.0%
National rate is 8.1%
These figures cover 269 flights between July 2025 and June 2026. Beyond the headline rate, 17.0% 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 4036 flies
F9 4036 flies ATL to CLE without a single fixed slot. Its most common scheduled departure was 21:15, used on 65 of 269 flights, with 18:56 (31 flights) and 22:59 (30 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 21:1565 flights24.2%
- Departs 18:5631 flights11.5%
- Departs 22:5930 flights11.2%
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 21:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and F9 4036 runs 10 points worse at 60.6%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
F9 4036 next to ATL to CLE
Every carrier on ATL to CLE combined arrived on time 80.6% of the time across 3,407 flights, so F9 4036 is 20 points behind it. Frontier flew 714 flights on the same city pair under all its flight numbers, including this one, and those ran 69.8% on time. Across its whole network Frontier Airlines managed 73.2%, which this flight trails by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 4036thin sample | 269 | 60.6% | 68 min | 3.35% | D− |
| All Frontier Airlines on ATL–CLE | 714 | 69.8% | 68 min | 2.52% | C |
| All carriers on ATL–CLE | 3,407 | 80.6% | 60 min | 2.00% | B |
| Frontier Airlines, whole network | 205,332 | 73.2% | 84 min | 1.85% | C |
Across the year
F9 4036 quarter by quarter
F9 4036 did not run the same all year. Its best quarter was Jul–Sep 2025 at 65.5% on time and its weakest Oct–Dec 2025 at 54.5%, 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 202559 flights65.5%
- Oct–Dec 202567 flights54.5%
- Jan–Mar 202679 flights61.6%
- Apr–Jun 202664 flights61.3%
Scale runs 45% to 70%. Rows with fewer than 30 flights show a dash.
By weekday, F9 4036 did best on Friday at 76.5% on time and worst on Saturday at 48.6%. Each day rests on about 38 flights, so a gap of 28 points is worth noticing but could still narrow in another year.
Delay causes
Why F9 4036 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 66% of the 6,966 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.
- 66%Late-arriving aircraft
- 26%Carrier
- 5%National Airspace System
- 2%Extreme weather
66% 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 6,966 reported delay minutes here, that single category outweighs weather by 27 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 6,966 delay minutes reported on F9 4036.
Cancellations run at 3.35%, against 1.81% nationally. That is about one flight in 30 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 17.0% 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.
The 554 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
Every one of the 269 flights under F9 4036 in the data flew ATL to CLE. 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. 269 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 4036
For a booking, the cancellation rate is the figure to plan around on F9 4036: 3.35% of its 269 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ATL to CLE, every carrier and departure
- CLE to ATL, the return direction
- Delta Air Lines 1320 on the same route78.4%
- Delta Air Lines 775 on the same route87.1%
- Delta Air Lines 2545 on the same route88.5%
- Delta Air Lines 2978 on the same route90.3%
- Frontier Airlines 2410 on the same route75.9%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Cleveland Hopkins International (CLE) 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.