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

Return flights

25 Sep - 09 Oct	Ryanair	direct
25 Sep - 11 Oct	Ryanair	direct
25 Sep - 14 Oct	Ryanair	direct
30 Sep - 14 Oct	Ryanair
27 Sep - 11 Oct	Air Europa
23 Sep - 09 Oct	Ryanair	direct
27 Sep - 09 Oct	Ryanair	direct
20 Sep - 11 Oct	Ryanair
25 Sep - 02 Oct	Ryanair
23 Sep - 11 Oct	Ryanair	direct
25 Sep - 29 Sep	Ryanair
25 Sep - 27 Sep	Ryanair
25 Sep - 30 Sep	easyJet
27 Sep - 29 Sep	Air Europa
27 Sep - 30 Sep	Air Europa
22 Sep - 29 Sep	Scandinavian Airlines
23 Sep - 25 Sep	easyJet
25 Sep - 28 Sep	Ryanair
26 Sep - 29 Sep	Jet2
26 Sep - 30 Sep	Vueling Airlines

Also check the deals for one-way flights from Alicante 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 Alicante to Sofia in September from $118

Return flights