Route reliability record
MIA→AUS
Miami to Austin
- Flights
- 2,236
- Period
- September 2025 to August 2026
- Distance
- 1,103 mi
- Carriers
- 5
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, 5 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 2,236 MIA to AUS flights, with a median arrival 5 minutes early.
Best time to fly MIA to AUS: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 90.8% of the time and Tuesday flights 81.5%, against 72.2% for the route overall.
The national on-time rate over the same period is 77.3%, so this route runs 5 points behind the country as a whole. Across a thousand flights that is about 51 extra late arrivals.
Key figures
On time
72.2%
Arrivals under 15 minutes late, of 2,212 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
0.89%
National rate is 1.89%
Best carrier
American
73.9% on time across 1,551 flights
These figures cover 2,236 flights between September 2025 and August 2026. Beyond the headline rate, 9.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Carrier by carrier
Which airline is most reliable on MIA to AUS
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 |
|---|---|---|---|---|---|
| Frontier Airlinesthin sample | 28 | 78.6% | 100 min | 0.00% | B+ |
| Envoy Airthin sample | 17 | 76.5% | 48 min | 0.00% | B+ |
| American Airlines | 1,551 | 73.9% | 72 min | 1.03% | C |
| Delta Air Linesthin sample | 284 | 69.4% | 86 min | 1.06% | C |
| Southwest Airlinesthin sample | 356 | 66.5% | 53 min | 0.28% | C+ |
Flight by flight
Flights on MIA to AUS
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.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Best ways to make this trip
The most reliable ways to fly Miami to Austin
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. MIA → AUSMiami to Austin | American Airlines | 73.1% | 73.9% | 1.03% | 5am–8am, Tue | AA 2629 19:40 |
| 2. FLL → AUSFort Lauderdale to Austin | Southwest Airlines | 72.5% | 72.9% | 0.54% | 5am–8am, Tue | — |
| 3. FLL → AUSFort Lauderdale to Austin | JetBlue Airways | 54.5% | 55.4% | 1.64% | 8am–11am, Tue | B6 2271 20:00 |
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 24 points, against half a point between the best and worst carrier.
- 5am–8am110 flights90.8%
- 8am–11am375 flights87.4%
- 11am–2pm268 flights67.3%
- 2pm–5pm464 flights67.5%
- 5pm–8pm668 flights67.1%
- 8pm–5am351 flights70.0%
Scale runs 60% to 95%.
Book the early departure. Flights leaving between 5am–8am arrive on time 90.8% of the time, against 67.1% for the evening window. That is 24 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5pm–8pm window is the busiest, with 668 flights scheduled in it.
Explore
Filter MIA to AUS 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 AUS, the best departure window is 5am–8am at 90.8% on time and the worst is 5pm–8pm at 67.1%, a wide gap of 23.7 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am90.8%
- 8–11am87.4%
- 11am–2pm67.3%
- 2–5pm67.5%
- 5–8pm67.1%
- 8pm–5am70.0%
best all US flightsScale 60% to 95%.
Across the year
When delays peak on this route
This route's year swings by 22 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 57.5% on time, 22 points below September, the best at 79.8%. 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 81.5% on time and Sunday the weakest at 60.6%, a spread of 21 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 43,000 reported delay minutes.
- 40%Late-arriving aircraft
- 38%Carrier
- 15%National Airspace System
- 7%Extreme weather
- 0%Security
40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 43,000 reported delay minutes here, that single category outweighs weather by 6 to one. The split is drawn from 43,157 reported delay minutes.
The largest share of delay minutes, 38%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 16,000 of the 43,000 delay minutes reported here.
Cancellations are rare at 0.89%, 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
9.7% 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.
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 79.8% on time across 2,236 flights, 8 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 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 AUS 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. September runs 79.8% on time and July 57.5%, a swing of 22 points. If the dates move at all, move them out of July before you think about anything else. 2,212 completed flights over 12 months sit behind that.
Common questions
MIA to AUS questions
How often is MIA to AUS delayed?
Roughly one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 27.8% 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 MIA to AUS compared with the rest of the country?
72.2% of flights arrive on time here against a national 77.3%, a difference of 5 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 AUS?
The 5am–8am departure window is the strongest at 90.8% on time. The 5pm–8pm window is the weakest at 67.1%, 24 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 MIA to AUS?
July is the weakest month at 57.5% on time, compared with 79.8% in September. Across the year that is 22 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
- AUS to MIA — the return legseparate record
- Miami International (MIA) delay statistics
- Austin-Bergstrom International (AUS) delay statistics
- American Airlines on MIA to AUS73.9%
- Delta Air Lines on MIA to AUS69.4%
- Southwest Airlines on MIA to AUS66.5%
- MIA to ATL, a related route74.2%
- DEN to AUS, a related route76.2%
- MIA to LGA, a related route67.4%
- Frontier Airlines on-time record78.6%
- Envoy Air on-time record76.5%
- American Airlines on-time record73.9%
- Why the first flight of the morning is statistically safest
- How often a connection fails at the major US hubs
Direction matters. MIA to AUS and AUS to MIA are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Embed MIA to AUS’s on-time badge on your site
Paste this into a web page. The badge shows the current on-time rate, cancellation rate and grade, and updates every month. Preview it, or build a badge for another route or airport.
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.