AirHint found the following cheapest return flights from Paris (CDG) to Sofia (SOF) in September 2026 (see full year).

Return flights

15 Sep - 30 Sep	Austrian Airlines
12 Sep - 14 Sep	SWISS
16 Sep - 04 Oct	Air Serbia
17 Sep - 04 Oct	Air Serbia
15 Sep - 20 Sep	Austrian Airlines
27 Sep - 11 Oct	SKY express
18 Sep - 04 Oct	SKY express
25 Sep - 11 Oct	SKY express
27 Sep - 04 Oct	SKY express
04 Sep - 13 Sep	SKY express
04 Sep - 20 Sep	SKY express
25 Sep - 04 Oct	SKY express
04 Sep - 18 Sep	SKY express

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 157€

Return flights