Best time to fly Rio Branco to São Paulo

Every month pooled across the years on record, so "July" means July generally rather than one particular July. Full RBR to GRU record →

There is not yet enough of the year on record for this route to say anything about seasons. The months below are shown as recorded.

Month Flights On time Cancelled When late, by
January 14 71.4% 0% 49 min
February 12 83.3% 0% 32 min
March 13 84.6% 0% 33 min
April 25 70.8% 4% 33 min
May 28 75% 0% 26 min
June 27 81.5% 0% 39 min
July 35 82.9% 0% 27 min
August 22 95.5% 0% 31 min
September 21 85.7% 0% 38 min
October 1 100% 0%
November 12 83.3% 0% 29 min
December 13 66.7% 7.69% 46 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.