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

Return flights

13 Dec - 16 Dec	Ryanair
11 Dec - 15 Dec	Ryanair
16 Dec - 17 Dec	Ryanair
10 Dec - 17 Dec	Vueling Airlines
04 Dec - 06 Dec	Ryanair
01 Dec - 03 Dec	Ryanair
03 Dec - 09 Dec	easyJet
10 Dec - 12 Dec	easyJet
06 Dec - 17 Dec	Ryanair
10 Dec - 13 Dec	easyJet
17 Dec - 07 Jan	Wizz Air Malta
17 Dec - 05 Jan	Wizz Air Malta
11 Dec - 04 Jan	easyJet
12 Dec - 05 Jan	Vueling Airlines
12 Dec - 04 Jan	Vueling Airlines
24 Dec - 01 Jan	Ryanair
21 Dec - 05 Jan	Ryanair
20 Dec - 07 Jan	Ryanair
28 Dec - 01 Jan	Ryanair
29 Dec - 01 Jan	Ryanair

Also check the deals for one-way flights from Lisbon to Sofia in December.

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 Lisbon to Sofia in December from $108

Return flights