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

Return flights

30 Sep - 08 Oct	Wizz Air
17 Sep - 24 Sep	Ryanair
24 Sep - 03 Oct	Wizz Air
30 Sep - 07 Oct	Wizz Air
14 Sep - 17 Sep	Wizz Air
24 Sep - 30 Sep	Wizz Air
24 Sep - 27 Sep	Wizz Air
15 Sep - 17 Sep	Wizz Air
16 Sep - 20 Sep	Wizz Air
17 Sep - 25 Sep	Ryanair
17 Sep - 21 Sep	Wizz Air
30 Sep - 06 Oct	easyJet
17 Sep - 23 Sep	Wizz Air
14 Sep - 19 Sep	Wizz Air
22 Sep - 01 Oct	Ryanair
20 Sep - 01 Oct	Air Serbia

Also check the deals for one-way flights from Sofia to Lisbon 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 Sofia to Lisbon in September from 123€

Return flights