Route reliability record
MIA→CHS
Miami to Charleston
- Flights
- 952
- Period
- September 2025 to August 2026
- Distance
- 489 mi
- Carriers
- 3
This route sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 952 MIA to CHS flights, with a median arrival 1 minute early.
Best time to fly MIA to CHS: a 8am–11am departure, ideally on a Tuesday. Flights in that window arrived on time 87.5% of the time and Tuesday flights 78.6%, against 68.2% for the route overall.
The national on-time rate over the same period is 77.3%, so this route runs 9 points behind the country as a whole. Across a thousand flights that is about 91 extra late arrivals.
Key figures
On time
68.2%
Arrivals under 15 minutes late, of 938 completed flights
Avg delay
82 min
Across delayed arrivals only, not all flights
Cancelled
1.26%
National rate is 1.89%
Best carrier
American
66.3% on time across 884 flights
These figures cover 952 flights between September 2025 and August 2026. Beyond the headline rate, 12.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on MIA to CHS
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 Airthin sample | 53 | 98.1% | 16 min | 0.00% | A+ |
| Republic Airwaysthin sample | 15 | 76.9% | 48 min | 13.33% | B− |
| American Airlines | 884 | 66.3% | 82 min | 1.13% | C |
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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 29 points, against half a point between the best and worst carrier.
- 5am–8am107 flights84.9%
- 8am–11am177 flights87.5%
- 11am–2pm5 flights—
- 2pm–5pm39 flights71.4%
- 5pm–8pm264 flights60.9%
- 8pm–5am360 flights58.6%
Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 58.6% on time, against 87.5% for the 8am–11am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 8pm–5am window is the busiest, with 360 flights scheduled in it.
Explore
Filter MIA to CHS 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 MIA to CHS, the best departure window is 8am–11am at 87.5% on time and the worst is 8pm–5am at 58.6%, a wide gap of 28.9 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am84.9%
- 8–11am87.5%
- 11am–2pm—
- 2–5pm71.4%
- 5–8pm60.9%
- 8pm–5am58.6%
best all US flightsScale 50% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 44 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.
August is the worst month at 41.0% on time, 44 points below September, the best at 85.2%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. March was the busiest month here, with 93 flights.
Across the week, Tuesday is the strongest day at 78.6% on time and Sunday the weakest at 50.4%, a spread of 28 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 43% of the 24,000 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 43%Carrier
- 11%National Airspace System
- 3%Extreme weather
- 0%Security
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 24,000 reported delay minutes here, that single category outweighs weather by 12 to one. The split is drawn from 24,303 reported delay minutes.
The largest share of delay minutes, 43%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 10,000 of the 24,000 delay minutes reported here.
Cancellations sit at 1.26% against a national 1.89%, which is ordinary. Diversions add another 0.21%.
Connections and stage length
What a delay here actually costs
12.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 489 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 8am–11am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 80.1% on time across 953 flights, 12 points above 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 12 points of difference.
One caution: this is a thin sample. 952 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 CHS after this flight
What to do with this
Booking this route
Put together: treat all of this as provisional. 952 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 68.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 938 completed flights over 12 months sit behind that.
Common questions
MIA to CHS questions
How often is MIA to CHS delayed?
About one flight in three arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 31.8% of the 952 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
How reliable is MIA to CHS compared with the rest of the country?
68.2% of flights arrive on time here against a national 77.3%, a difference of 9 points against it. That is worth a C on this site's grading scale.
What time of day has the fewest delays on MIA to CHS?
The 8am–11am departure window is the strongest at 87.5% on time. The 8pm–5am window is the weakest at 58.6%, 29 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 August delays on MIA to CHS?
August is the weakest month at 41.0% on time, compared with 85.2% in September. Across the year that is 44 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
- CHS to MIA — the return legseparate record
- Miami International (MIA) delay statistics
- Charleston International (CHS) delay statistics
- MIA to ATL, a related route74.2%
- ATL to CHS, a related route82.3%
- MIA to LGA, a related route67.4%
- Envoy Air on-time record98.1%
- Republic Airways on-time record76.9%
- American Airlines on-time record66.3%
- 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. MIA to CHS and CHS to MIA 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.