Best time to fly London to Thessaloniki

Every month pooled across the years on record, so "July" means July generally rather than one particular July. Full STN to SKG 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 48 68.8% 0% 0 min
February 64 82.5% 1.56% 0 min
March 68 94.1% 0% 0 min
April 50 80% 0% 0 min
May 51 52.9% 0% 0 min
June 51 49% 0% 0 min
July 23 39.1% 0% 0 min
August 22 54.5% 0% 0 min
September 22 59.1% 0% 0 min
October 25 64% 0% 0 min
November 36 80.6% 0% 0 min
December 34 79.4% 0% 0 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.