Route profile
CHS→MIA
Flight reliability, delays and best times to fly from Charleston to Miami, 489 miles.
Right now
Aviation weather is not currently a factor.
Aviation weather is not currently a factor.
Route reliability
July 2023 – July 2026
Better than 32% of comparable major US routes (4,598 compared)
Calculated from 2,706 flights. How this is calculated · What counts as on time
CHS → MIA arrives on time 79.3% of the time; the return trip, MIA → CHS, arrives on time 69.8% of the time, a 9.5-point gap between the two directions of the same city pair.
CHS → MIA spends 23.9 minutes on the ground on a 489-mile trip: 14.8 minutes from pushback to wheels-up at CHS and 9.2 minutes from touchdown to gate at MIA.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What sets this route apart
Where CHS to MIA differs most from similar routes by hour, weekday, month and airline, July 2023 – July 2026.
CHS to MIA struggles most at 7 AM: 76.8% of its flights scheduled then arrive on time, 11.1 points behind the 87.9% on routes of similar length at the same hour. Against all other routes the gap is 11 points.
June is kinder to CHS to MIA than to routes of similar length: 81.9% on time against 73.7%, 8.2 points better. Against all other routes the gap is 9.2 points.
American Airlines does better on CHS to MIA than on its routes of similar length: 77.9% on time here, 74.6% there, 3.3 points apart. Against all other routes the gap is 2.8 points.
CHS to MIA against comparable routes
July 2023 – July 2026| Measure | This route | Compared with | Them | Gap | Flights behind it |
|---|---|---|---|---|---|
| Hour: 7 AM departures | 76.8% | routes of similar length | 87.9% | −11.1 pts | 151 here, 97,889 there |
| Month: June | 81.9% | routes of similar length | 73.7% | +8.2 pts | 210 here, 118,433 there |
| Airline: American Airlines | 77.9% | routes of similar length | 74.6% | +3.3 pts | 2,034 here, 228,635 there |
Each comparison pools the flights of other routes, with this route’s own left out. Similar length means within 15% of this route’s 489 miles, with at least 5 such routes. A bucket is set against the most comparable group that has enough flights: similar length, then the same origin (at least 3 routes), then all other routes. Hours, weekdays and months appear only where both sides have 120 completed flights, and airlines where both have 600. The gap must be at least 2 points and 2 standard errors, and only the largest gap each way is kept per measure. These are differences in the flights counted, not causes.
When it goes wrong
July 2023 – July 2026
53 min late
against a median of 8 min early
CHS → MIA has an average that understates its risk: a typical arrival is 8 min early, but the worst tenth are 61 minutes worse than that. If the trip has something unmissable at the end of it, the median is the wrong number to plan against.
Percentiles over 2,706 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at MIA after arriving from CHS.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 33% | Likely to miss |
| 45 min | 20% | High risk |
| 60 min | 14% | Some risk |
| 90 min | 9.0% | Some risk |
| 120 min | 6.4% | Some risk |
This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 1.66% of the time and diverts 0.26% of the time, which a late arrival never shows up in.
Chance of missing is the share of 2,654 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.
The worst tenth of arrivals on this route land at least 53 minutes late (90th-percentile gate arrival delay), over 2,706 operations.
Any other layover length: connection checker.
Best time to fly
CHS → MIA flights departing 5–9 AM arrived on time 89.8% of the time, against 65.6% for 6–9 PM departures, a gap of 24.2 percentage points.
By departure window
By departure hour
- 12 AM to 4 AM: too few flights to score
- 5 AM: 91.0% on time from 182 flights
- 6 AM: 91.8% on time from 848 flights
- 7 AM: 76.8% on time from 153 flights
- 8 AM to 9 AM: too few flights to score
- 10 AM: 83.0% on time from 198 flights
- 11 AM: 78.8% on time from 120 flights
- 12 PM to 5 PM: too few flights to score
- 6 PM: 59.6% on time from 188 flights
- 7 PM: 66.6% on time from 405 flights
- 8 PM: 67.5% on time from 362 flights
- 9 PM to 11 PM: too few flights to score
Departure windows with fewer than 120 flights are not scored.
Why CHS → MIA runs late
July 2023 – July 2026
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for CHS → MIA. Only delays of 15 minutes or more are attributed. What the five causes mean
Late-arriving aircraft is the largest cause on CHS → MIA, at 57.1%: flights here mostly leave late because the plane came in late, and the day shows it: 5–9 AM departures arrived on time 89.8% of the time and 6–9 PM departures 65.6%.
Airlines on this route
Carriers with at least 200 flights, by the airline that operated each one.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| American Airlines | 2,074 | 77.9% | 1.64% | -8 min | 10.3% |
| Envoy Air | 609 | 83.8% | 1.48% | -7 min | 5.8% |
American Airlines flew 77.3% of the 2,683 flights listed.
Envoy Air arrived on time 5.9 percentage points more often than American Airlines on this route.
Weekly and seasonal patterns
By day of week
Wednesday is historically the most reliable day and Sunday the least, a gap of 11.4 percentage points.
By month
- Jan: 79.4%
- Feb: 77.4%
- Mar: 79.0%
- Apr: 78.3%
- May: 76.5%
- Jun: 81.9%
- Jul: 73.4%
- Aug: 75.7%
- Sep: 83.3%
- Oct: 85.1%
- Nov: 87.8%
- Dec: 78.0%
July is historically the weakest month and November the strongest, a spread of 14.4 percentage points.
Reliability over time
July 2023 – July 2026
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 79.6% against 80.6% in the 12 months before — broadly unchanged.
Data and methodology
Calculated by FlyerIntel from 2,706 CHS → MIA flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.
Full methodology · Data sources · Report a problem
Related research: How Long a Layover Needs to Be · Two Airlines on One Route · Best Time of Day to Fly From Major US Airports
Analysis last recomputed