Route reliability record
CVG→MIA
Cincinnati to Miami
- Flights
- 989
- Period
- September 2025 to August 2026
- Distance
- 948 mi
- Carriers
- 5
This route lands a B+, 4 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 about an hour on average. That rests on 989 CVG to MIA flights, with a median arrival 7 minutes early.
Best time to fly CVG to MIA: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 89.2% of the time and Tuesday flights 84.9%, against 81.6% for the route overall.
Set against the rest of the country, this route's record is 4 points better than the US average of 77.3%. That gap is worth roughly 43 fewer late arrivals for every thousand flights.
Key figures
On time
81.6%
Arrivals under 15 minutes late, of 977 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
0.81%
National rate is 1.89%
Best carrier
Envoy
83.8% on time across 795 flights
These figures cover 989 flights between September 2025 and August 2026. The median arrival is 7 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.
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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 | 795 | 83.8% | 53 min | 0.63% | B+ |
| American Airlinesthin sample | 76 | 75.3% | 139 min | 1.32% | B |
| Frontier Airlinesthin sample | 101 | 72.4% | 71 min | 1.98% | C |
| Republic Airwaysthin sample | 16 | 62.5% | 46 min | 0.00% | D+ |
| 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.
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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 | 83.3% | 83.8% | 0.63% | 5am–8am, Sat | MQ 3638 08:41 |
| 2. CVG → FLLCincinnati to Fort Lauderdale | Delta Air Lines | 78.2% | 79.0% | 0.95% | 5am–8am, Wed | DL 661 14:39 |
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 16 points, against half a point between the best and worst carrier.
- 5am–8am439 flights89.2%
- 8am–11am167 flights79.3%
- 11am–2pm53 flights82.4%
- 2pm–5pm8 flights—
- 5pm–8pm311 flights72.9%
- 8pm–5am11 flights—
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 89.2% of the time, against 72.9% for the evening window. That is 16 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 439 flights scheduled in it.
Explore
Filter CVG to MIA by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On CVG to MIA, the best departure window is 5am–8am at 89.2% on time and the worst is 5pm–8pm at 72.9%, a wide gap of 16.3 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am89.2%
- 8–11am79.3%
- 11am–2pm82.4%
- 2–5pm—
- 5–8pm72.9%
- 8pm–5am—
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
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 84.9% on time and Sunday the weakest at 78.9%, a spread of 6 points.
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 12,000 reported delay minutes.
- 41%Carrier
- 36%Late-arriving aircraft
- 20%National Airspace System
- 3%Extreme weather
- 0%Security
36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 12,000 reported delay minutes here, that single category outweighs weather by 13 to one. The split is drawn from 11,556 reported delay minutes.
The largest share of delay minutes, 41%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,771 of the 12,000 delay minutes reported here.
Cancellations are rare at 0.81%, 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 actually costs
5.8% 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 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.
The return leg runs 81.4% on time across 989 flights, within half 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. 989 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. 989 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 81.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 977 completed flights over 12 months sit behind that.
Common questions
CVG to MIA questions
How often is CVG to MIA delayed?
Roughly 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 18.4% of the 989 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
How reliable is CVG to MIA compared with the rest of the country?
81.6% of flights arrive on time here against a national 77.3%, a difference of 4 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 89.2% on time. The 5pm–8pm window is the weakest at 72.9%, 16 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 MIA83.8%
- Frontier Airlines on CVG to MIA72.4%
- CVG to ORD, a related route70.8%
- ATL to MIA, a related route71.2%
- CVG to ATL, a related route85.4%
- Envoy Air on-time record83.8%
- American Airlines on-time record75.3%
- Frontier Airlines on-time record72.4%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.