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

Return flights

29 Sep - 02 Oct	Ryanair
30 Sep - 03 Oct	Ryanair
17 Sep - 26 Sep	Ryanair
02 Sep - 05 Sep	Ryanair
30 Sep - 02 Oct	Ryanair
10 Sep - 17 Sep	Ryanair
22 Sep - 25 Sep	Ryanair
24 Sep - 28 Sep	Ryanair
01 Sep - 05 Sep	Ryanair
08 Sep - 12 Sep	Ryanair
18 Sep - 19 Sep	Ryanair
20 Sep - 24 Sep	Ryanair
15 Sep - 17 Sep	Ryanair
28 Sep - 02 Oct	Ryanair
28 Sep - 05 Oct	Ryanair

Also check the deals for one-way flights from Warsaw 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 Warsaw to Sofia in September from 145€

Return flights