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

Return flights

08 Sep - 20 Sep	easyJet
01 Sep - 10 Sep	Vueling Airlines
15 Sep - 18 Sep	easyJet
16 Sep - 18 Sep	Air Serbia
17 Sep - 20 Sep	Air Serbia
18 Sep - 20 Sep	Air Serbia
18 Sep - 22 Sep	Air Serbia
23 Sep - 27 Sep	Air Serbia
23 Sep - 30 Sep	Air Serbia
23 Sep - 02 Oct	Air Serbia
19 Sep - 23 Sep	Air Serbia
27 Sep - 05 Oct	easyJet

Also check the deals for one-way flights from Paris 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 Paris to Sofia in September from $180

Return flights