AirHint found the following cheapest return flights from Athens (ATH) to Sofia (SOF) in August 2025 (see full year).

Return flights

31 Aug - 09 Sep	Aegean Airlines
31 Aug - 03 Sep	Aegean Airlines
31 Aug - 02 Sep	SKY express
31 Aug - 04 Sep	SKY express
31 Aug - 06 Sep	SKY express
31 Aug - 01 Sep	Aegean Airlines
31 Aug - 07 Sep	SKY express
30 Aug - 04 Sep	SKY express
30 Aug - 02 Sep	Air Serbia
31 Aug - 05 Sep	SKY express
30 Aug - 31 Aug	Air Serbia

Also check the deals for one-way flights from Athens to Sofia in August.

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 Athens to Sofia in August from $227

Return flights