September is the quiet secret of the Mediterranean charter season. The crowds thin, the water is at its warmest, the slot pressure eases, and the aircraft that spent August shuttling between the islands start flying home. That last part is where the value is.

Where the aircraft are in late summer

By the end of August the fleet is distributed across the leisure map: Ibiza and Palma, Olbia, Figari, Mykonos, Nice as the hub between them. Through September that distribution unwinds. Operators pull aircraft back toward their bases, and every repositioning flight is a potential empty leg: the same aircraft, a fraction of the price, on the day it happens to be flying anyway.

The unwinding follows the geography. The Nice to Olbia lane runs both ways all month. Corsica empties northward through Figari and Ajaccio. The Balearics feed back into Geneva, Zurich and London. If your dates are flexible by even a day or two, late summer is the best empty-leg hunting of the year, and our alert desk does the watching.

The islands in September

Corsica keeps its slot coordination until late October, but the pressure drops with the crowds; parking that was impossible in the first week of August becomes a phone call in the last week of September. Our Corsica guide covers the four airports and the rules in detail. Sardinia through Olbia is similar. The Balearics relax earlier. Mykonos and the Greek islands hold their season longest, with warm water into October.

Pricing softens, but not evenly

Charter prices in late September can sit noticeably below the August peak on the same lane, but the softening is uneven: weekends still price like weekends, and the last Sunday of the school holidays prices like the last Sunday of the school holidays. Midweek in the second half of September is the sweet spot. For the underlying numbers per class, see our cost guide and the route pages, each of which carries an indicative from-price.

If the summer got away from you, this is the recovery window. Tell us the dates and whether they bend; flexibility is worth real money in September.