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

Return flights

23 Sep - 01 Oct	Pegasus Airlines
24 Sep - 29 Sep	Ryanair
18 Sep - 24 Sep	Pegasus Airlines
11 Sep - 18 Sep	Ryanair
23 Sep - 24 Sep	Ryanair
15 Sep - 23 Sep	easyJet
20 Sep - 25 Sep	Eurowings
11 Sep - 20 Sep	Ryanair
29 Sep - 06 Oct	easyJet
12 Sep - 19 Sep	Ryanair
12 Sep - 20 Sep	Ryanair
19 Sep - 24 Sep	Ryanair
27 Sep - 05 Oct	Air Serbia
27 Sep - 04 Oct	Ryanair
28 Sep - 13 Oct	SKY express
21 Sep - 06 Oct	SKY express
28 Sep - 06 Oct	SKY express

Also check the deals for one-way flights from Duesseldorf 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 Duesseldorf to Sofia in September from $198

Return flights