Flight number record

F9 3725

Frontier Airlines · Cincinnati to Denver

Route: CVG → DEN
Departs: 06:05
Flights: 273
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s F9 3725, check with Frontier Airlines.

F9 3725 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 273 flights, with a median arrival 9 minutes early.

Set against the rest of the country, F9 3725's record is 8 points better than the US average of 77.6%. That gap is worth roughly 84 fewer late arrivals for every thousand flights.

On time

86.0%

Arrivals under 15 minutes late, of 271 completed flights

Avg delay

115 min

Across delayed arrivals only, not all flights

Cancelled

0.37%

National rate is 1.81%

1 hour+ late

7.4%

National rate is 8.1%

These figures cover 273 flights between July 2025 and June 2026. The median arrival is 9 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Schedule

When F9 3725 flies

F9 3725 flies CVG to DEN without a single fixed slot. Its most common scheduled departure was 06:05, used on 54 of 273 flights, with 20:36 (30 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:0554 flights19.8%
Departs 20:3630 flights11.0%

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 06:05 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and F9 3725 runs 3 points worse at 86.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

F9 3725 next to CVG to DEN

Every carrier on CVG to DEN combined arrived on time 81.6% of the time across 1,521 flights, so F9 3725 is 4 points ahead of it. Across its whole network Frontier Airlines managed 73.2%, which this flight beats by 13 points.

F9 3725 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 3725thin sample	273	86.0%	115 min	0.37%	A+
All Frontier Airlines on CVG–DEN	403	82.1%	96 min	1.24%	B
All carriers on CVG–DEN	1,521	81.6%	77 min	0.99%	B+
Frontier Airlines, whole network	205,332	73.2%	84 min	1.85%	C

Across the year

F9 3725 quarter by quarter

F9 3725 did not run the same all year. Its best quarter was Jul–Sep 2025 at 94.0% on time and its weakest Jan–Mar 2026 at 76.8%, a swing of 17 points on roughly 68 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 202584 flights94.0%
Oct–Dec 202568 flights86.6%
Jan–Mar 202657 flights76.8%
Apr–Jun 202664 flights82.8%

Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, F9 3725 ranged from 82.6% on Monday to 91.1% on Sunday. With about 39 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why F9 3725 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 53% of the 4,352 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
53%
Carrier
29%
National Airspace System
17%
Extreme weather
1%

53% 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 4,352 reported delay minutes here, that single category outweighs weather by 49 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 4,352 delay minutes reported on F9 3725.

Cancellations are rare at 0.37%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

7.4% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last close to two hours, 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. 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 273 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. 273 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, F9 3725 has one of the better records a US domestic flight can show: 86.0% on time and 0.37% cancelled. That is a base rate, not a promise about any single day.

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