Carrier route record

F9CVG→MIA

Frontier Airlines · Cincinnati to Miami

Flights: 128
Period: July 2025 to June 2026
Share of route: 13%
Carriers: 5

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

Frontier on CVG to MIA sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 128 flights, with a median arrival 11 minutes early.

The national on-time rate over the same period is 77.6%, so Frontier on CVG to MIA runs 5 points behind the country as a whole. Across a thousand flights that is about 48 extra late arrivals.

On time

72.8%

Arrivals under 15 minutes late, of 125 completed flights

Avg delay

77 min

Across delayed arrivals only, not all flights

Cancelled

1.56%

National rate is 1.81%

Whole route

80.1%

Every carrier on CVG to MIA, 998 flights

These figures cover 128 flights between July 2025 and June 2026. Beyond the headline rate, 14.4% 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.

Carrier by carrier

Frontier against every carrier on CVG to MIA

Frontier flew 128 of the 998 flights on CVG to MIA, about 13% of it. Its 72.8% on time is 7 points worse than the route as a whole, which runs 80.1%. Ranked by on-time rate it is number three of five carriers on the route, where the range runs from Envoy at 82.2% to Delta at 0.0%. Three 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 MIA
Airline	Flights	On time	Avg delay	Cancelled	Grade
Envoy Air	782	82.2%	56 min	0.64%	B+
American Airlinesthin sample	76	75.3%	139 min	1.32%	B
Frontier Airlines (this page)thin sample	128	72.8%	77 min	1.56%	C
Republic Airwaysthin sample	11	54.5%	43 min	0.00%	F+
Delta Air Linesthin sample	1	0.0%	37 min	0.00%	F+

Departure window

When Frontier runs best on this route

Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 128 flights.

There are not enough flights in each departure window to split Frontier's CVG to MIA record by time of day without the percentages moving on noise. The headline rate of 72.8% is the reliable figure here.

Across the year

Frontier on CVG to MIA through the year

Jul–Sep 202527 flights—
Oct–Dec 202518 flights—
Jan–Mar 202663 flights73.3%
Apr–Jun 202620 flights—

Scale runs 65% to 80%. Rows with fewer than 30 flights show a dash.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 72.8% on time across 128 flights.

Split by quarter, Frontier on CVG to MIA logged 27 flights in Jul–Sep 2025, 18 flights in Oct–Dec 2025, 63 flights in Jan–Mar 2026 and 20 flights in Apr–Jun 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 72.8% annual figure is the one to use.

Delay causes

Why Frontier runs late on this route

One category carries most of the weight here. Late-arriving aircraft accounts for 59% of the 2,613 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
59%
Carrier
21%
National Airspace System
18%
Extreme weather
2%

59% 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 2,613 reported delay minutes here, that single category outweighs weather by 25 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 2,613 reported delay minutes.

Cancellations sit at 1.56% against a national 1.81%, which is ordinary. Diversions add another 0.78%.

Connections and stage length

What a delay here costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 14.4% 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 948 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.

The return leg is a different operation and performs like one: it runs 69.0% on time across 129 flights, 4 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 4 points of difference.

One caution: this is a thin sample. 128 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 MIA

Put together: treat all of this as provisional. 128 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 72.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 125 completed flights over 12 months sit behind that.

Where to go next

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