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

Return flights

29 Sep - 07 Oct	Wizz Air
29 Sep - 06 Oct	Ryanair	direct
28 Sep - 06 Oct	Wizz Air
26 Sep - 06 Oct	Wizz Air
24 Sep - 05 Oct	Ryanair	direct
26 Sep - 08 Oct	Wizz Air	direct
29 Sep - 05 Oct	Ryanair	direct
24 Sep - 08 Oct	Wizz Air	direct
28 Sep - 06 Oct	Wizz Air	direct
28 Sep - 10 Oct	Wizz Air	direct
21 Sep - 30 Sep	Ryanair
26 Sep - 30 Sep	Ryanair
22 Sep - 24 Sep	Wizz Air
26 Sep - 29 Sep	Wizz Air
24 Sep - 29 Sep	Ryanair
28 Sep - 29 Sep	Wizz Air
17 Sep - 30 Sep	Air Europa
23 Sep - 30 Sep	Air Europa
22 Sep - 25 Sep	Wizz Air
21 Sep - 24 Sep	Ryanair

Also check the deals for one-way flights from Madrid 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 Madrid to Sofia in September from 92€

Return flights