Route reliability record
AUS→PHL
Austin to Philadelphia
- Flights
- 1,150
- 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 about 3.1 hours on average. That rests on 1,150 AUS to PHL flights, with a median arrival 6 minutes early.
Best time to fly AUS to PHL: a 8am–11am departure, ideally on a Tuesday. Flights in that window arrived on time 83.6% of the time and Tuesday flights 83.2%, against 76.2% 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
76.2%
Arrivals under 15 minutes late, of 1,124 completed flights
Avg delay
188 min
Across delayed arrivals only, not all flights
Cancelled
2.00%
National rate is 1.89%
Best carrier
American
76.2% on time across 1,105 flights
These figures cover 1,150 flights between September 2025 and August 2026. Beyond the headline rate, 12.2% 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 AUS to PHL
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 | 37 | 78.4% | 57 min | 0.00% | B+ |
| American Airlines | 1,105 | 76.2% | 193 min | 2.08% | B |
| Republic Airwaysthin sample | 8 | 75.0% | 69 min | 0.00% | B+ |
Flight by flight
Flights on AUS to PHL
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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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 11 points, against half a point between the best and worst carrier.
- 5am–8am342 flights83.3%
- 8am–11am61 flights83.6%
- 11am–2pm326 flights72.2%
- 2pm–5pm373 flights72.5%
- 5pm–8pm48 flights72.9%
- 8pm–5am—
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 72.2% on time against 83.6% for 8am–11am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 2pm–5pm window is the busiest, with 373 flights scheduled in it.
Explore
Filter AUS to PHL 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 PHL, the best departure window is 8am–11am at 83.6% on time and the worst is 11am–2pm at 72.2%, a wide gap of 11.4 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am83.3%
- 8–11am83.6%
- 11am–2pm72.2%
- 2–5pm72.5%
- 5–8pm72.9%
- 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 15 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.
April is the best month on the calendar at 84.2% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. October was the busiest month here, with 122 flights.
Across the week, Tuesday is the strongest day at 83.2% on time and Sunday the weakest at 68.1%, a spread of 15 points.
Delay causes
Why this route gets delayed
Carrier accounts for 57% of the 50,000 delay minutes carriers reported here, and the remaining four split what is left.
- 57%Carrier
- 33%Late-arriving aircraft
- 6%National Airspace System
- 3%Extreme weather
The largest share of delay minutes, 57%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 29,000 of the 50,000 delay minutes reported here. The split is drawn from 50,111 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 83.6% on time here.
Cancellations sit at 2.00% against a national 1.89%, which is ordinary. Diversions add another 0.26%.
Connections and stage length
What a delay here actually costs
12.2% 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 76.3% on time across 1,147 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 1,150 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 PHL 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. April runs 84.2% on time and March 69.0%, a swing of 15 points. If the dates move at all, move them out of March before you think about anything else. 1,124 completed flights over 12 months sit behind that.
Common questions
AUS to PHL questions
How often is AUS to PHL 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 1,150 flights in this analysis, against 22.7% nationally. Delayed flights are late by about 3.1 hours on average.
How reliable is AUS to PHL compared with the rest of the country?
76.2% 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 AUS to PHL?
The 8am–11am departure window is the strongest at 83.6% on time. The 11am–2pm window is the weakest at 72.2%, 11 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 March delays on AUS to PHL?
March is the weakest month at 69.0% on time, compared with 84.2% in April. Across the year that is 15 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
- PHL to AUS — the return legseparate record
- Austin-Bergstrom International (AUS) delay statistics
- Philadelphia International (PHL) delay statistics
- AUS to DEN, a related route78.9%
- ATL to PHL, a related route74.6%
- AUS to DFW, a related route74.9%
- Frontier Airlines on-time record78.4%
- American Airlines on-time record76.2%
- Republic Airways on-time record75.0%
- 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 PHL and PHL 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.