Best time to fly São Paulo to Dallas/Fort Worth
Every month pooled across the years on record, so "July" means July generally rather than one particular July. Full GRU to DFW record →
Best month
August
91.9% on time · 62 flights
Worst month
December
73.8% on time · 68 flights
| Month | Flights | On time | Cancelled | When late, by |
|---|---|---|---|---|
| January | 76 | 85.9% | 6.58% | 344 min |
| February | 60 | 78.3% | 0% | 160 min |
| March | 63 | 77.8% | 0% | 132 min |
| April | 60 | 86% | 5% | 33 min |
| May | 62 | 78.3% | 3.23% | 104 min |
| June | 60 | 84.5% | 3.33% | 614 min |
| July | 93 | 88% | 1.08% | 532 min |
| August | 62 | 91.9% | 0% | 356 min |
| September | 60 | 86% | 5% | 610 min |
| October | 62 | 80.3% | 1.61% | 131 min |
| November | 60 | 75% | 6.67% | 171 min |
| December | 68 | 73.8% | 4.41% | 261 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.