Route reliability record
AUS→MIA
Austin to Miami
- Flights
- 2,236
- Period
- September 2025 to August 2026
- Distance
- 1,103 mi
- Carriers
- 6
This route lands a B, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 2,236 AUS to MIA flights, with a median arrival 8 minutes early.
Best time to fly AUS to MIA: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 91.2% of the time and Tuesday flights 87.0%, against 79.8% for the route overall.
The US average over the same twelve months is 77.3%, 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
79.8%
Arrivals under 15 minutes late, of 2,205 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
1.12%
National rate is 1.89%
Best carrier
American
80.8% on time across 1,550 flights
These figures cover 2,236 flights between September 2025 and August 2026. The median arrival is 8 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 AUS 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 |
|---|---|---|---|---|---|
| Spirit Airlinesthin sample | 1 | 100.0% | — | 0.00% | A+ |
| Delta Air Linesthin sample | 283 | 89.6% | 74 min | 1.41% | A |
| Frontier Airlinesthin sample | 28 | 85.7% | 125 min | 0.00% | A+ |
| Envoy Airthin sample | 17 | 82.4% | 75 min | 0.00% | B+ |
| American Airlines | 1,550 | 80.8% | 84 min | 1.16% | B |
| Southwest Airlinesthin sample | 357 | 67.0% | 42 min | 0.84% | C+ |
Flight by flight
Flights on AUS 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 Austin 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. AUS → MIAAustin to Miami | American Airlines | 79.9% | 80.8% | 1.16% | 5am–8am, Tue | — |
| 2. AUS → FLLAustin to Fort Lauderdale | JetBlue Airways | 71.8% | 72.9% | 1.46% | 5am–8am, Tue | B6 2272 06:00 |
| 3. AUS → FLLAustin to Fort Lauderdale | Southwest Airlines | 60.1% | 60.4% | 0.54% | 11am–2pm, Sat | — |
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 29 points, against half a point between the best and worst carrier.
- 5am–8am689 flights91.2%
- 8am–11am504 flights85.7%
- 11am–2pm512 flights73.8%
- 2pm–5pm158 flights62.0%
- 5pm–8pm371 flights66.6%
- 8pm–5am2 flights—
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 91.2% of the time, against 62.0% for the afternoon window. That is 29 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 689 flights scheduled in it.
Explore
Filter AUS 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 AUS to MIA, the best departure window is 5am–8am at 91.2% on time and the worst is 2pm–5pm at 62.0%, a wide gap of 29.2 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am91.2%
- 8–11am85.7%
- 11am–2pm73.8%
- 2–5pm62.0%
- 5–8pm66.6%
- 8pm–5am—
best all US flightsScale 55% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 13 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.
July is the worst month at 72.3% on time, 13 points below February, the best at 85.6%. 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 217 flights.
Across the week, Tuesday is the strongest day at 87.0% on time and Saturday the weakest at 73.9%, a spread of 13 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 45% of the 32,000 delay minutes carriers reported here, and the remaining four split what is left.
- 45%Late-arriving aircraft
- 36%Carrier
- 16%National Airspace System
- 2%Extreme weather
- 1%Security
45% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 32,000 reported delay minutes here, that single category outweighs weather by 23 to one. The split is drawn from 32,342 reported delay minutes.
The largest share of delay minutes, 36%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 12,000 of the 32,000 delay minutes reported here.
Cancellations sit at 1.12% against a national 1.89%, which is ordinary. Diversions add another 0.27%.
Connections and stage length
What a delay here actually costs
6.8% 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 a little over an hour, which a normal layover absorbs.
The 1,103 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 is a different operation and performs like one: it runs 72.2% on time across 2,236 flights, 8 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 8 points of difference.
The sample behind these figures is 2,236 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in MIA after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. February runs 85.6% on time and July 72.3%, a swing of 13 points. If the dates move at all, move them out of July before you think about anything else. 2,205 completed flights over 12 months sit behind that.
Common questions
AUS to MIA questions
How often is AUS 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 20.2% of the 2,236 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
How reliable is AUS to MIA compared with the rest of the country?
79.8% of flights arrive on time here against a national 77.3%, 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 AUS to MIA?
The 5am–8am departure window is the strongest at 91.2% on time. The 2pm–5pm window is the weakest at 62.0%, 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 July delays on AUS to MIA?
July is the weakest month at 72.3% on time, compared with 85.6% in February. Across the year that is 13 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 AUS — the return legseparate record
- Austin-Bergstrom International (AUS) delay statistics
- Miami International (MIA) delay statistics
- Delta Air Lines on AUS to MIA89.6%
- American Airlines on AUS to MIA80.8%
- Southwest Airlines on AUS to MIA67.0%
- AUS to DEN, a related route78.9%
- ATL to MIA, a related route71.2%
- AUS to DFW, a related route74.9%
- Spirit Airlines on-time record100.0%
- Delta Air Lines on-time record89.6%
- Frontier Airlines on-time record85.7%
- 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. AUS to MIA and MIA to AUS 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.