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

Return flights

15 Sep - 16 Sep	SKY express
15 Sep - 17 Sep	SKY express
23 Sep - 27 Sep	Aegean Airlines
14 Sep - 16 Sep	Bulgaria Air
12 Sep - 16 Sep	SKY express
10 Sep - 17 Sep	easyJet
24 Sep - 28 Sep	Aegean Airlines
15 Sep - 20 Sep	SKY express
16 Sep - 16 Sep	Aegean Airlines
15 Sep - 18 Sep	SKY express
21 Sep - 03 Oct	SKY express
14 Sep - 03 Oct	SKY express
19 Sep - 03 Oct	SKY express
21 Sep - 02 Oct	SKY express
14 Sep - 02 Oct	SKY express
19 Sep - 02 Oct	SKY express

Also check the deals for one-way flights from Heraklion 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.

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Cheapest return flights from Heraklion to Sofia in September from $149

Return flights