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

Return flights

21 Sep - 27 Sep	Ryanair
28 Sep - 02 Oct	Ryanair
28 Sep - 01 Oct	Ryanair
20 Sep - 27 Sep	Ryanair
27 Sep - 01 Oct	Ryanair
28 Sep - 03 Oct	Ryanair
27 Sep - 30 Sep	Ryanair
21 Sep - 24 Sep	Ryanair
24 Sep - 27 Sep	Ryanair
19 Sep - 27 Sep	Ryanair
22 Sep - 27 Sep	Ryanair
24 Sep - 01 Oct	Ryanair
27 Sep - 29 Sep	Ryanair
28 Sep - 29 Sep	Ryanair
21 Sep - 23 Sep	Ryanair
27 Sep - 01 Oct	Ryanair	direct
28 Sep - 01 Oct	Ryanair	direct
24 Sep - 01 Oct	Ryanair	direct

Also check the deals for one-way flights from Dublin 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 Dublin to Sofia in September from 95€

Return flights