Route reliability record
CVG→MIA
Cincinnati to Miami
- Flights
- 998
- Period
- July 2025 to June 2026
- Distance
- 948 mi
- Carriers
- 5
This route lands a B+, 3 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 998 CVG to MIA flights, with a median arrival 5 minutes early.
Best time to fly CVG to MIA: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 90.0% of the time and Tuesday flights 84.7%, against 80.1% for the route overall.
The US average over the same twelve months is 77.6%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
80.1%
Arrivals under 15 minutes late, of 986 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
0.80%
National rate is 1.81%
Best carrier
Envoy
82.2% on time across 782 flights
These figures cover 998 flights between July 2025 and June 2026. The median arrival is 5 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.
Carrier by carrier
Which airline is most reliable on CVG to MIA
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.
| 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 Airlinesthin 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+ |
Flight by flight
Flights on CVG to MIA
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
Best ways to make this trip
The most reliable ways to fly Cincinnati to Miami
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 1 of the top 2 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. CVG → MIACincinnati to Miami | Envoy Air | 81.7% | 82.2% | 0.64% | 5am–8am, Sat | MQ 3638 08:41 |
| 2. CVG → FLLCincinnati to Fort Lauderdale | Delta Air Lines | 77.3% | 78.3% | 1.31% | 5am–8am, Wed | DL 661 16:32 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 20 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am442 flights90.0%
- 8am–11am144 flights78.0%
- 11am–2pm36 flights79.4%
- 2pm–5pm8 flights—
- 5pm–8pm357 flights69.6%
- 8pm–5am11 flights—
Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 90.0% of the time, against 69.6% for the evening window. That is 20 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 442 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 24 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
December is the weak month at 68.2% on time, against 91.8% in November. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. March was the busiest month here, with 122 flights.
Across the week, Tuesday is the strongest day at 84.7% on time and Sunday the weakest at 73.8%. 11 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 13,000 reported delay minutes.
- 40%Late-arriving aircraft
- 33%Carrier
- 18%National Airspace System
- 9%Extreme weather
- 0%Security
40% 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 13,000 reported delay minutes here, that single category outweighs weather by 5 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 13,046 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 90.0% on time here.
Cancellations are rare at 0.80%, 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 stage length
What a delay here actually costs
6.7% 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 about an hour, which a normal layover absorbs.
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 runs 77.4% on time across 998 flights, within 3 points 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. 998 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.
Work out the risk of missing a connection in MIA after this flight
What to do with this
Booking this route
Put together: treat all of this as provisional. 998 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 80.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 986 completed flights over 12 months sit behind that.
Common questions
CVG to MIA questions
How often is CVG to MIA delayed?
About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 19.9% of the 998 flights in this analysis, against 22.4% nationally. Delayed flights are late by about an hour on average.
How reliable is CVG to MIA compared with the rest of the country?
80.1% of flights arrive on time here against a national 77.6%, a difference of 3 points in its favour. That is worth a B+ on this site's grading scale.
What time of day has the fewest delays on CVG to MIA?
The 5am–8am departure window is the strongest at 90.0% on time. The 5pm–8pm window is the weakest at 69.6%, 20 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are December delays on CVG to MIA?
December is the weakest month at 68.2% on time, compared with 91.8% in November. Across the year that is 24 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- MIA to CVG — the return legseparate record
- Cincinnati/Northern Kentucky International (CVG) delay statistics
- Miami International (MIA) delay statistics
- Envoy Air on CVG to MIA82.2%
- Frontier Airlines on CVG to MIA72.8%
- CVG to ORD, a related route70.2%
- ATL to MIA, a related route71.0%
- CVG to ATL, a related route86.4%
- Envoy Air on-time record82.2%
- American Airlines on-time record75.3%
- Frontier Airlines on-time record72.8%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
Direction matters. CVG to MIA and MIA to CVG are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.