Route reliability record
PHL→AUS
Philadelphia to Austin
- Flights
- 1,147
- Period
- September 2025 to August 2026
- Distance
- 1,431 mi
- Carriers
- 3
This route lands a B, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 1,147 PHL to AUS flights, with a median arrival 9 minutes early.
Best time to fly PHL to AUS: a 8am–11am departure, ideally on a Tuesday. Flights in that window arrived on time 80.8% of the time and Tuesday flights 83.6%, against 76.3% 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
76.3%
Arrivals under 15 minutes late, of 1,123 completed flights
Avg delay
83 min
Across delayed arrivals only, not all flights
Cancelled
1.74%
National rate is 1.89%
Best carrier
American
75.9% on time across 1,102 flights
These figures cover 1,147 flights between September 2025 and August 2026. Beyond the headline rate, 10.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on PHL 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 |
|---|---|---|---|---|---|
| Republic Airwaysthin sample | 8 | 87.5% | 99 min | 0.00% | A+ |
| Frontier Airlinesthin sample | 37 | 86.5% | 62 min | 0.00% | A+ |
| American Airlines | 1,102 | 75.9% | 84 min | 1.81% | B |
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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 13 points, against half a point between the best and worst carrier.
- 5am–8am25 flights—
- 8am–11am392 flights80.8%
- 11am–2pm309 flights78.4%
- 2pm–5pm73 flights76.7%
- 5pm–8pm321 flights68.0%
- 8pm–5am27 flights—
Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 80.8% of the time, against 68.0% for the evening window. That is 13 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 392 flights scheduled in it.
Explore
Filter PHL 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 PHL to AUS, the best departure window is 8am–11am at 80.8% on time and the worst is 5pm–8pm at 68.0%, a wide gap of 12.8 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am—
- 8–11am80.8%
- 11am–2pm78.4%
- 2–5pm76.7%
- 5–8pm68.0%
- 8pm–5am—
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
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.
July is the worst month at 67.8% on time, 20 points below February, the best at 87.3%. 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. October was the busiest month here, with 122 flights.
Across the week, Tuesday is the strongest day at 83.6% on time and Sunday the weakest at 69.0%, a spread of 15 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 54% of the 22,000 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Late-arriving aircraft
- 26%Carrier
- 17%National Airspace System
- 3%Extreme weather
54% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 22,000 reported delay minutes here, that single category outweighs weather by 18 to one. The split is drawn from 22,195 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 80.8% on time here.
Cancellations sit at 1.74% against a national 1.89%, which is ordinary. Diversions add another 0.35%.
Connections and stage length
What a delay here actually costs
10.0% 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 1,431 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 runs 76.2% on time across 1,150 flights, within half 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 1,147 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. February runs 87.3% on time and July 67.8%, a swing of 20 points. If the dates move at all, move them out of July before you think about anything else. 1,123 completed flights over 12 months sit behind that.
Common questions
PHL to AUS questions
How often is PHL 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 1,147 flights in this analysis, against 22.7% nationally. Delayed flights are late by an hour and a half on average.
How reliable is PHL to AUS compared with the rest of the country?
76.3% of flights arrive on time here against a national 77.3%, 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 PHL to AUS?
The 8am–11am departure window is the strongest at 80.8% on time. The 5pm–8pm window is the weakest at 68.0%, 13 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 PHL to AUS?
July is the weakest month at 67.8% on time, compared with 87.3% in February. 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 PHL — the return legseparate record
- Philadelphia International (PHL) delay statistics
- Austin-Bergstrom International (AUS) delay statistics
- PHL to ATL, a related route78.0%
- DEN to AUS, a related route76.2%
- PHL to MCO, a related route72.4%
- Republic Airways on-time record87.5%
- Frontier Airlines on-time record86.5%
- American Airlines on-time record75.9%
- 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. PHL to AUS and AUS to PHL 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.