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

Return flights

25 Sep - 30 Sep	Wizz Air UK
25 Sep - 29 Sep	Wizz Air UK
26 Sep - 30 Sep	Ryanair
16 Sep - 19 Sep	Wizz Air UK
02 Sep - 05 Sep	Ryanair
30 Sep - 03 Oct	Ryanair
01 Sep - 06 Sep	Ryanair
09 Sep - 14 Sep	Ryanair
05 Sep - 14 Sep	Ryanair
12 Sep - 14 Sep	Ryanair
28 Sep - 05 Oct	Ryanair
08 Sep - 15 Sep	Ryanair
17 Sep - 01 Oct	SKY express

Also check the deals for one-way flights from Prague 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 Prague to Sofia in September from 114€

Return flights