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

Return flights

01 Sep - 08 Sep	Bulgaria Air	direct
05 Sep - 08 Sep	Bulgaria Air	direct
07 Sep - 08 Sep	Bulgaria Air	direct
05 Sep - 12 Sep	Bulgaria Air
08 Sep - 08 Sep	Ryanair
12 Sep - 12 Sep	Smart Wings
12 Sep - 16 Sep	Smart Wings
09 Sep - 09 Sep	TUIfly

Also check the deals for one-way flights from Bourgas 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 Bourgas to Sofia in September from 106€

Return flights