Average delays for scheduled flights at Scotland’s busiest airport were reduced by one minute to eight minutes in April to June compared to last year.
A total of 86 per cent of flights operated within the industry’s punctuality measure of up to 15 minutes late - up 2 percentage points.
The figure equals that for January to March last year, but this year’s achievement is more significant because more people fly in the spring than winter.
The figure is believed to be the airport’s highest for the season since CAA records began 15 years ago.
However, Edinburgh’s charter flight punctuality slumped from 76 per cent to 62 per cent, with average delays increasing from 19 to 33 minutes.
The airport said only about 2 per cent of its passengers travelled on such flights.
An airport spokesman said: “The team at Edinburgh airport is committed to giving our passengers the best service possible, and punctuality is an important component in this.
“It takes a lot of collaboration, co-ordination and dedication to get it right and we’re pleased to see we’re getting it right most of the time.
“We’ll continue to work hard to make sure that this trend continues.”
Glasgow airport saw scheduled flight punctuality improve by 1 percentage point to 84 per cent, with average delays down by one minute to ten minutes.
Its charter flight punctuality was unchanged at 76 per cent, with average delays increasing by four minutes to 22 minutes.