Route reliability record
SJC→AUS
San Jose to Austin
- Flights
- 1,143
- Period
- July 2025 to June 2026
- Distance
- 1,476 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 1,143 SJC to AUS flights, with a median arrival 1 minute early.
Best time to fly SJC to AUS: a 5am–8am departure, ideally on a Saturday. Flights in that window arrived on time 93.5% of the time and Saturday flights 88.1%, against 76.2% 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
76.2%
Arrivals under 15 minutes late, of 1,135 completed flights
Avg delay
46 min
Across delayed arrivals only, not all flights
Cancelled
0.26%
National rate is 1.81%
Best carrier
Southwest
76.2% on time across 1,143 flights
These figures cover 1,143 flights between July 2025 and June 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
Carrier by carrier
Which airline is most reliable on SJC 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 | 1,143 | 76.2% | 46 min | 0.26% | B+ |
Best ways to make this trip
The most reliable ways to fly San Jose 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. SFO → AUSSan Francisco to Austin | United Airlines | 82.1% | 82.7% | 0.73% | 5am–8am, Wed | UA 1107 07:00 |
| 2. SJC → AUSSan Jose to Austin | Southwest Airlines | 76.0% | 76.2% | 0.26% | 5am–8am, Sat | — |
| 3. SFO → AUSSan Francisco to Austin | Delta Air Lines | 60.0% | 61.0% | 1.58% | 2pm–5pm, Sat | DL 381 13:10 |
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 36 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–8am282 flights93.5%
- 8am–11am228 flights83.2%
- 11am–2pm168 flights74.4%
- 2pm–5pm176 flights57.7%
- 5pm–8pm281 flights65.6%
- 8pm–5am8 flights—
Scale runs 50% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 93.5% of the time, against 57.7% for the afternoon window. That is 36 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 282 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 21 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.
June is the worst month at 62.8% on time, 21 points below August, the best at 84.2%. 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. July was the busiest month here, with 111 flights.
Across the week, Saturday is the strongest day at 88.1% on time and Friday the weakest at 69.5%. 19 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 57% of the 12,000 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.
- 57%Late-arriving aircraft
- 26%Carrier
- 16%National Airspace System
- 1%Extreme weather
57% 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 12,000 reported delay minutes here, that single category outweighs weather by 57 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 12,481 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 93.5% on time here.
Cancellations are rare at 0.26%, below the national 1.81% 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
5.3% 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 1,476 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 74.3% on time across 1,141 flights, within 2 points 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 1,143 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. August runs 84.2% on time and June 62.8%, a swing of 21 points. If the dates move at all, move them out of June before you think about anything else. 1,135 completed flights over 12 months sit behind that.
Common questions
SJC to AUS questions
How often is SJC 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 23.8% of the 1,143 flights in this analysis, against 22.4% nationally. Delayed flights are late by roughly 45 minutes on average.
How reliable is SJC to AUS compared with the rest of the country?
76.2% 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 SJC to AUS?
The 5am–8am departure window is the strongest at 93.5% on time. The 2pm–5pm window is the weakest at 57.7%, 36 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 June delays on SJC to AUS?
June is the weakest month at 62.8% on time, compared with 84.2% in August. Across the year that is 21 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 SJC — the return legseparate record
- Norman Y. Mineta San Jose International (SJC) delay statistics
- Austin-Bergstrom International (AUS) delay statistics
- SJC to SAN, a related route72.4%
- DEN to AUS, a related route76.1%
- SJC to LAX, a related route86.6%
- Southwest Airlines on-time record76.2%
- 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. SJC to AUS and AUS to SJC 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.