Route reliability record
MDW→AUS
Chicago to Austin
- Flights
- 1,356
- Period
- July 2025 to June 2026
- Distance
- 972 mi
- Carriers
- 1
This route lands a B, about a point worse than the national rate of 77.6%. About one flight in four arrives 15 minutes late or worse, and those flights are late by roughly 45 minutes on average. That is a workable record, not a spotless one. That rests on 1,356 MDW to AUS flights, with a median arrival 3 minutes early.
Best time to fly MDW to AUS: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 89.5% of the time and Tuesday flights 83.1%, against 76.3% 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
76.3%
Arrivals under 15 minutes late, of 1,339 completed flights
Avg delay
47 min
Across delayed arrivals only, not all flights
Cancelled
1.03%
National rate is 1.81%
Best carrier
Southwest
76.3% on time across 1,356 flights
These figures cover 1,356 flights between July 2025 and June 2026. The median arrival is 3 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 MDW 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 |
|---|---|---|---|---|---|
| Southwest Airlines | 1,356 | 76.3% | 47 min | 1.03% | B |
Best ways to make this trip
The most reliable ways to fly Chicago 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. ORD → AUSChicago to Austin | United Airlines | 77.1% | 77.9% | 1.09% | 5am–8am, Sat | — |
| 2. MDW → AUSChicago to Austin | Southwest Airlines | 75.5% | 76.3% | 1.03% | 5am–8am, Tue | — |
| 3. ORD → AUSChicago to Austin | American Airlines | 65.1% | 67.0% | 2.86% | 5am–8am, Tue | — |
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 28 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–8am133 flights89.5%
- 8am–11am392 flights86.0%
- 11am–2pm138 flights75.7%
- 2pm–5pm229 flights77.3%
- 5pm–8pm147 flights61.9%
- 8pm–5am317 flights65.0%
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 61.9% on time, against 89.5% for the 5am–8am 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 8am–11am window is the busiest, with 392 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 20 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 65.4% on time, against 85.6% in September. 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. October was the busiest month here, with 137 flights.
Across the week, Tuesday is the strongest day at 83.1% on time and Friday the weakest at 72.4%. 11 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. Late-arriving aircraft accounts for 49% of the 15,000 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.
- 49%Late-arriving aircraft
- 28%Carrier
- 20%National Airspace System
- 3%Extreme weather
- 1%Security
49% 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 15,000 reported delay minutes here, that single category outweighs weather by 15 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 14,795 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 89.5% on time here.
Cancellations sit at 1.03% against a national 1.81%, which is ordinary. Diversions add another 0.22%.
Connections and stage length
What a delay here actually costs
5.5% 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 roughly 45 minutes, which a normal layover absorbs.
The 972 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 runs 77.5% on time across 1,352 flights, within about a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 1,356 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 85.6% on time and December 65.4%, a swing of 20 points. If the dates move at all, move them out of December before you think about anything else. 1,339 completed flights over 12 months sit behind that.
Common questions
MDW to AUS questions
How often is MDW to AUS delayed?
About 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 23.7% of the 1,356 flights in this analysis, against 22.4% nationally. Delayed flights are late by roughly 45 minutes on average.
How reliable is MDW to AUS compared with the rest of the country?
76.3% of flights arrive on time here against a national 77.6%, a difference of about a point against it. That is worth a B on this site's grading scale.
What time of day has the fewest delays on MDW to AUS?
The 5am–8am departure window is the strongest at 89.5% on time. The 5pm–8pm window is the weakest at 61.9%, 28 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 MDW to AUS?
December is the weakest month at 65.4% on time, compared with 85.6% in September. Across the year that is 20 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 MDW — the return legseparate record
- Chicago Midway International (MDW) delay statistics
- Austin-Bergstrom International (AUS) delay statistics
- MDW to ATL, a related route79.8%
- DEN to AUS, a related route76.1%
- MDW to PHX, a related route75.0%
- Southwest Airlines on-time record76.3%
- 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. MDW to AUS and AUS to MDW are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Embed MDW 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.