Best time to fly New York to San Antonio

Every month pooled across the years on record, so "July" means July generally rather than one particular July. Full JFK to SAT 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 30 81.5% 10% 274 min
February 28 80.8% 7.14% 37 min
March 31 92.6% 12.9% 277 min
April 30 96.7% 0% 209 min
May 31 96.8% 0% 32 min
June 30 82.8% 0% 43 min
July 31 87.1% 0% 123 min
August 31 100% 0%
September 30 90% 0% 89 min
October 31 90.3% 0% 95 min
November 30 90% 0% 25 min
December 29 70.4% 6.9% 98 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.