Best time to fly Austin to Philadelphia
Every month pooled across the years on record, so "July" means July generally rather than one particular July. Full AUS to PHL record →
Best month
April
84.2% on time · 77 flights
Worst month
July
66.7% on time · 126 flights
| Month | Flights | On time | Cancelled | When late, by |
|---|---|---|---|---|
| January | 62 | 82.5% | 8.06% | 354 min |
| February | 68 | 81.3% | 5.88% | 353 min |
| March | 89 | 69% | 2.25% | 292 min |
| April | 77 | 84.2% | 1.3% | 128 min |
| May | 107 | 80.8% | 0.93% | 179 min |
| June | 113 | 76.1% | 0% | 128 min |
| July | 126 | 66.7% | 6.35% | 135 min |
| August | 117 | 75.2% | 2.56% | 77 min |
| September | 113 | 81.4% | 0% | 233 min |
| October | 122 | 72.1% | 0% | 71 min |
| November | 121 | 71.1% | 0% | 152 min |
| December | 87 | 74.1% | 2.3% | 70 min |
What a seasonal pattern can and cannot tell you
Months differ for reasons that repeat — summer thunderstorms in the American interior, winter fog and de-icing in northern Europe, school holidays filling every seat and leaving no slack in the schedule. Those are real and they come back each year.
What the pattern cannot do is forecast a particular flight. A quiet month has late days and a bad month has punctual ones. Treat this as a way to choose between two dates you are indifferent about, not as a promise.