AirHint found the following cheapest return flights from Milan (LIN) to Sofia (SOF) in September 2025 (see full year).

Return flights

16 Sep - 22 Sep	ITA Airways
20 Sep - 26 Sep	ITA Airways
27 Sep - 01 Oct	ITA Airways
29 Sep - 03 Oct	ITA Airways
20 Sep - 22 Sep	ITA Airways
21 Sep - 24 Sep	ITA Airways
30 Sep - 02 Oct	easyJet
11 Sep - 14 Sep	ITA Airways
12 Sep - 14 Sep	ITA Airways
12 Sep - 15 Sep	ITA Airways
20 Sep - 24 Sep	ITA Airways
20 Sep - 23 Sep	easyJet
17 Sep - 24 Sep	easyJet
13 Sep - 13 Oct	ITA Airways
29 Sep - 02 Oct	easyJet

Also check the deals for one-way flights from Milan to Sofia in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

Book a cheap hotel in Sofia

Cheap car rent in Sofia

Cheapest return flights from Milan to Sofia in September from 161€

Return flights