Carrier route record

F9CVG→DEN

Frontier Airlines · Cincinnati to Denver

Flights: 381
Period: September 2025 to August 2026
Share of route: 25%
Carriers: 4

Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Frontier Airlines.

Frontier on CVG to DEN lands a B+, 5 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 381 flights, with a median arrival 8 minutes early.

Set against the rest of the country, Frontier's CVG to DEN record is 5 points better than the US average of 77.3%. That gap is worth roughly 47 fewer late arrivals for every thousand flights.

On time

82.0%

Arrivals under 15 minutes late, of 377 completed flights

Avg delay

87 min

Across delayed arrivals only, not all flights

Cancelled

0.79%

National rate is 1.89%

Whole route

82.7%

Every carrier on CVG to DEN, 1,498 flights

These figures cover 381 flights between September 2025 and August 2026. Beyond the headline rate, 8.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Carrier by carrier

Frontier against every carrier on CVG to DEN

Frontier flew 381 of the 1,498 flights on CVG to DEN, about 25% of it. Its 82.0% on time is about level with the route as a whole at 82.7%. Ranked by on-time rate it is number three of four carriers on the route, where the range runs from United at 87.2% to Southwest at 74.2%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.

Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.

On-time performance by carrier on CVG to DEN
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlines	727	87.2%	78 min	0.55%	A+
Allegiant Airthin sample	26	84.6%	35 min	0.00%	B+
Frontier Airlines (this page)	381	82.0%	87 min	0.79%	B+
Southwest Airlinesthin sample	364	74.2%	51 min	1.37%	C

Flight by flight

Frontier flight numbers on CVG to DEN

F9 372520:3681.8% · 278 flights

Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Departure window

When Frontier runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 13 points, against half a point between the best and worst carrier.

5am–8am124 flights87.8%
8am–11am35 flights80.0%
11am–2pm67 flights86.4%
2pm–5pm25 flights—
5pm–8pm15 flights—
8pm–5am115 flights75.2%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 87.8% of the time, against 75.2% for the overnight window. That is 13 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 124 flights scheduled in it.

Across the year

Frontier on CVG to DEN through the year

Jul–Sep 202542 flights92.9%
Oct–Dec 2025120 flights80.7%
Jan–Mar 202671 flights78.6%
Apr–Jun 202686 flights87.2%
Jul–Sep 202662 flights73.3%

Scale runs 65% to 100%.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 82.0% on time across 381 flights.

Frontier on CVG to DEN did not run the same all year. Its best quarter was Jul–Sep 2025 at 92.9% on time and its weakest Jul–Sep 2026 at 73.3%, a swing of 20 points on roughly 76 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.

Across the week, Sunday is the strongest day at 89.1% on time and Wednesday the weakest at 74.3%, a spread of 15 points.

Arrival by arrival

How late Frontier on CVG to DEN runs when it is late

Frontier on CVG to DEN often beats the schedule: 130 of 377 completed flights, 34%, arrived 15 minutes or more early. The 68 late arrivals split 15 under half an hour, 23 between 30 and 60 minutes, and 30 an hour or more.

15+ min early130 flights34.5%
Within 15 min179 flights47.5%
15–29 min late15 flights4.0%
30–59 min late23 flights6.1%
1–2 hours late18 flights4.8%
2+ hours late12 flights3.2%

Scale runs 0% to 100%.

Share of 377 completed flights by arrival against schedule.

14 of 60 late departures made up the time and arrived on time, 23% of them. In the other direction, 22 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 Frontier on CVG to DEN

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.

The latest arrivals of Frontier on CVG to DEN in the period
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 Frontier runs late on this route

Late-arriving aircraft accounts for 52% of the 5,912 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
52%
National Airspace System
27%
Carrier
20%
Extreme weather
1%

52% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,912 reported delay minutes here, that single category outweighs weather by 38 to one. The split is drawn from 5,912 reported delay minutes.

The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 87.8% on time here.

Cancellations are rare at 0.79%, below the national 1.89% 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 stage length

What a delay here costs

8.0% 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.

The return leg runs 80.9% on time across 379 flights, within about a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

One caution: this is a thin sample. 381 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 Frontier on CVG to DEN

Put together: treat all of this as provisional. 381 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 82.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 377 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures