Flight number record
F9 4075
Frontier Airlines · Atlanta to Houston
- Route
- ATL → IAH
- Departs
- 21:25
- Flights
- 336
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 4075, check with Frontier Airlines.
F9 4075 draws a D. Roughly 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 336 flights, with a median arrival 3 minutes late.
The national on-time rate over the same period is 77.3%, so F9 4075 runs 16 points behind the country as a whole. Across a thousand flights that is about 160 extra late arrivals.
Key figures
On time
61.3%
Arrivals under 15 minutes late, of 328 completed flights
Avg delay
104 min
Across delayed arrivals only, not all flights
Cancelled
2.38%
National rate is 1.89%
1 hour+ late
19.2%
National rate is 8.3%
These figures cover 336 flights between September 2025 and August 2026. Beyond the headline rate, 19.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 4075 flies
F9 4075 flies ATL to IAH without a single fixed slot. Its most common scheduled departure was 21:25, used on 88 of 336 flights, with 21:15 (88 flights) and 21:10 (35 flights) next.
- Departs 21:2588 flights26.2%
- Departs 21:1588 flights26.2%
- Departs 21:1035 flights10.4%
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 21:25 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and F9 4075 runs 9 points worse at 61.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
F9 4075 next to ATL to IAH
Every carrier on ATL to IAH combined arrived on time 76.9% of the time across 4,965 flights, so F9 4075 is 16 points behind it. Frontier flew 827 flights on the same city pair under all its flight numbers, including this one, and those ran 69.5% on time. Across its whole network Frontier Airlines managed 72.7%, which this flight trails by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 4075thin sample | 336 | 61.3% | 104 min | 2.38% | D |
| All Frontier Airlines on ATL–IAH | 827 | 69.5% | 87 min | 1.57% | C |
| All carriers on ATL–IAH | 4,965 | 76.9% | 69 min | 1.79% | B |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 4075 quarter by quarter
F9 4075 did not run the same all year. Its best quarter was Apr–Jun 2026 at 68.6% on time and its weakest Jul–Sep 2026 at 39.0%, a swing of 30 points on roughly 84 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 202522 flights—
- Oct–Dec 202577 flights59.7%
- Jan–Mar 202686 flights65.5%
- Apr–Jun 202689 flights68.6%
- Jul–Sep 202662 flights39.0%
Scale runs 30% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, F9 4075 ranged from 58.0% on Friday to 65.4% on Monday. With about 48 flights behind each day, a spread of 7 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late F9 4075 runs when it is late
F9 4075 often beats the schedule: 92 of 328 completed flights, 28%, arrived 15 minutes or more early. The 127 late arrivals split 35 under half an hour, 29 between 30 and 60 minutes, and 63 an hour or more.
- 15+ min early92 flights28.0%
- Within 15 min109 flights33.2%
- 15–29 min late35 flights10.7%
- 30–59 min late29 flights8.8%
- 1–2 hours late28 flights8.5%
- 2+ hours late35 flights10.7%
Scale runs 0% to 100%.
Share of 328 completed flights by arrival against schedule.
42 of 161 late departures made up the time and arrived on time, 26% of them. 8 flights left on time and still arrived late.
The worst days
Worst days for F9 4075
The latest arrival of the period was on 28 August 2026, 13 hours 32 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 August 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 28 August 2026 | 13 hours 32 minutes | Carrier |
| 22 February 2026 | 13 hours | Carrier |
| 24 August 2026 | 11 hours 39 minutes | Late-arriving aircraft |
| 10 November 2025 | 9 hours 16 minutes | Carrier |
| 27 August 2026 | 8 hours 38 minutes | Late-arriving aircraft |
Delay causes
Why F9 4075 runs late
Late-arriving aircraft accounts for 52% of the 13,000 delay minutes carriers reported here, and the remaining four split what is left.
- 52%Late-arriving aircraft
- 42%Carrier
- 4%National Airspace System
- 2%Extreme weather
52% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 13,000 reported delay minutes here, that single category outweighs weather by 32 to one. The split is drawn from 13,249 delay minutes reported on F9 4075.
Cancellations sit at 2.38% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
19.2% 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.
The 689 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 336 flights under F9 4075 in the data flew ATL to IAH. 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. 336 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 4075
For a booking, F9 4075 is a flight to put a long connection behind. 19.2% 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.
Related
Where to go next
- ATL to IAH, every carrier and departure
- IAH to ATL, the return direction
- Delta Air Lines 1601 on the same route75.0%
- Delta Air Lines 1284 on the same route71.6%
- Delta Air Lines 1682 on the same route84.5%
- Delta Air Lines 1585 on the same route82.3%
- Frontier Airlines 1403 on the same route74.7%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- George Bush Intercontinental (IAH) 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.