Route reliability record
IND→MIA
Indianapolis to Miami
- Flights
- 928
- Period
- July 2025 to June 2026
- Distance
- 1,020 mi
- Carriers
- 6
This route lands a B+, about a point 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 an hour and a half on average. That is a workable record, not a spotless one. That rests on 928 IND to MIA flights, with a median arrival 5 minutes early.
Best time to fly IND to MIA: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 86.4% of the time and Tuesday flights 86.4%, against 78.9% 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
78.9%
Arrivals under 15 minutes late, of 915 completed flights
Avg delay
92 min
Across delayed arrivals only, not all flights
Cancelled
0.97%
National rate is 1.81%
Best carrier
American
80.3% on time across 749 flights
These figures cover 928 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 IND 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 |
|---|---|---|---|---|---|
| American Airlines | 749 | 80.3% | 104 min | 1.20% | B |
| Frontier Airlinesthin sample | 4 | 75.0% | 86 min | 0.00% | B+ |
| Southwest Airlinesthin sample | 113 | 74.3% | 46 min | 0.00% | C+ |
| Envoy Airthin sample | 56 | 73.2% | 72 min | 0.00% | C+ |
| Delta Air Linesthin sample | 2 | 50.0% | 22 min | 0.00% | F+ |
| Republic Airwaysthin sample | 4 | 50.0% | 31 min | 0.00% | F+ |
Best ways to make this trip
The most reliable ways to fly Indianapolis 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. 2 of the top 3 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. IND → FLLIndianapolis to Fort Lauderdale | Southwest Airlines | 81.8% | 82.4% | 0.72% | 5am–8am, Wed | — |
| 2. IND → MIAIndianapolis to Miami | American Airlines | 79.3% | 80.3% | 1.20% | 5am–8am, Tue | — |
| 3. IND → FLLIndianapolis to Fort Lauderdale | Spirit Airlines | 77.7% | 80.5% | 3.49% | 5am–8am, Wed | — |
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 21 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–8am365 flights86.4%
- 8am–11am50 flights79.6%
- 11am–2pm230 flights81.6%
- 2pm–5pm45 flights73.3%
- 5pm–8pm237 flights65.7%
- 8pm–5am1 flights—
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 86.4% of the time, against 65.7% for the evening window. That is 21 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 365 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 30 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 62.5% on time, against 92.9% in October. 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. January was the busiest month here, with 122 flights.
Across the week, Tuesday is the strongest day at 86.4% on time and Sunday the weakest at 70.5%. 16 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
One category carries most of the weight here. Carrier accounts for 45% of the 18,000 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.
- 45%Carrier
- 35%Late-arriving aircraft
- 13%National Airspace System
- 7%Extreme weather
- 0%Security
35% 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 18,000 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 17,705 reported delay minutes.
The largest share of delay minutes, 45%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 8,012 of the 18,000 delay minutes reported here.
Cancellations sit at 0.97% against a national 1.81%, which is ordinary. Diversions add another 0.43%.
Connections and stage length
What a delay here actually costs
7.0% 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 an hour and a half, which a normal layover absorbs.
The 1,020 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 73.0% on time across 931 flights, 6 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 6 points of difference.
One caution: this is a thin sample. 928 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. 928 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 78.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 915 completed flights over 12 months sit behind that.
Common questions
IND to MIA questions
How often is IND 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 21.1% of the 928 flights in this analysis, against 22.4% nationally. Delayed flights are late by an hour and a half on average.
How reliable is IND to MIA compared with the rest of the country?
78.9% of flights arrive on time here against a national 77.6%, a difference of about a point in its favour. That is worth a B+ on this site's grading scale.
What time of day has the fewest delays on IND to MIA?
The 5am–8am departure window is the strongest at 86.4% on time. The 5pm–8pm window is the weakest at 65.7%, 21 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 IND to MIA?
December is the weakest month at 62.5% on time, compared with 92.9% in October. Across the year that is 30 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 IND — the return legseparate record
- Indianapolis International (IND) delay statistics
- Miami International (MIA) delay statistics
- American Airlines on IND to MIA80.3%
- Southwest Airlines on IND to MIA74.3%
- IND to ORD, a related route76.5%
- ATL to MIA, a related route71.0%
- IND to ATL, a related route88.5%
- American Airlines on-time record80.3%
- Frontier Airlines on-time record75.0%
- Southwest Airlines on-time record74.3%
- 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. IND to MIA and MIA to IND 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.