Flight number record
F9 3725
Frontier Airlines · Cincinnati to Denver
- Route
- CVG → DEN
- Departs
- 20:36
- Flights
- 278
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 3725, check with Frontier Airlines.
F9 3725 lands a B, 5 points better than the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 278 flights, with a median arrival 8 minutes early.
Set against the rest of the country, F9 3725's record is 5 points better than the US average of 77.3%. That gap is worth roughly 45 fewer late arrivals for every thousand flights.
Key figures
On time
81.8%
Arrivals under 15 minutes late, of 274 completed flights
Avg delay
98 min
Across delayed arrivals only, not all flights
Cancelled
1.08%
National rate is 1.89%
1 hour+ late
8.4%
National rate is 8.3%
These figures cover 278 flights between September 2025 and August 2026. Beyond the headline rate, 8.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 3725 flies
F9 3725 flies CVG to DEN without a single fixed slot. Its most common scheduled departure was 20:36, used on 58 of 278 flights.
- Departs 20:3658 flights20.9%
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 20:36 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and F9 3725 runs 12 points better at 81.8%. 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 3725 next to CVG to DEN
Every carrier on CVG to DEN combined arrived on time 82.7% of the time across 1,498 flights, so F9 3725 is about level with it. Across its whole network Frontier Airlines managed 72.7%, which this flight beats by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 3725thin sample | 278 | 81.8% | 98 min | 1.08% | B |
| All Frontier Airlines on CVG–DEN | 381 | 82.0% | 87 min | 0.79% | B+ |
| All carriers on CVG–DEN | 1,498 | 82.7% | 70 min | 0.80% | B+ |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 3725 quarter by quarter
F9 3725 did not run the same all year. Its best quarter was Oct–Dec 2025 at 86.6% on time and its weakest Jul–Sep 2026 at 72.9%, a swing of 14 points on roughly 70 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 202528 flights—
- Oct–Dec 202568 flights86.6%
- Jan–Mar 202657 flights76.8%
- Apr–Jun 202664 flights82.8%
- Jul–Sep 202661 flights72.9%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, F9 3725 did best on Sunday at 91.1% on time and worst on Saturday at 77.4%. Each day rests on about 40 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 3725 runs when it is late
F9 3725 often beats the schedule: 86 of 274 completed flights, 31%, arrived 15 minutes or more early. The 50 late arrivals split 12 under half an hour, 15 between 30 and 60 minutes, and 23 an hour or more.
- 15+ min early86 flights31.4%
- Within 15 min138 flights50.4%
- 15–29 min late12 flights4.4%
- 30–59 min late15 flights5.5%
- 1–2 hours late11 flights4.0%
- 2+ hours late12 flights4.4%
Scale runs 0% to 100%.
Share of 274 completed flights by arrival against schedule.
12 of 45 late departures made up the time and arrived on time, 27% of them. In the other direction, 17 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at DEN.
The worst days
Worst days for F9 3725
The latest arrival of the period was on 27 April 2026, 15 hours 3 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 April 2026 | 15 hours 3 minutes | Late-arriving aircraft |
| 13 August 2026 | 9 hours 35 minutes | Late-arriving aircraft |
| 14 August 2026 | 3 hours 40 minutes | National Airspace System |
| 30 June 2026 | 3 hours 5 minutes | Late-arriving aircraft |
| 4 January 2026 | 2 hours 59 minutes | Carrier |
Delay causes
Why F9 3725 runs late
Late-arriving aircraft accounts for 54% of the 4,919 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Late-arriving aircraft
- 26%National Airspace System
- 19%Carrier
- 1%Extreme weather
54% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,919 reported delay minutes here, that single category outweighs weather by 37 to one. The split is drawn from 4,919 delay minutes reported on F9 3725.
Cancellations sit at 1.08% against a national 1.89%, which is ordinary. Diversions add another 0.36%.
Connections and routes
What a delay on this flight costs
8.4% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.
The 1,069 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 278 flights under F9 3725 in the data flew CVG to DEN. 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. 278 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 3725
For a booking, read F9 3725 as 81.8% on time with 1.08% cancelled over 278 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- CVG to DEN, every carrier and departure
- DEN to CVG, the return direction
- United Airlines 1666 on the same route87.8%
- United Airlines 479 on the same route86.6%
- Cincinnati/Northern Kentucky International (CVG) delay statistics
- Denver International (DEN) 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.