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

Return flights

10 Dec - 12 Dec	Vueling Airlines
01 Dec - 07 Dec	easyJet
01 Dec - 14 Dec	Ryanair
05 Dec - 08 Dec	Ryanair
17 Dec - 23 Dec	Vueling Airlines
18 Dec - 23 Dec	Ryanair
20 Dec - 23 Dec	Ryanair
26 Dec - 31 Dec	easyJet
22 Dec - 04 Jan	Vueling Airlines
20 Dec - 29 Dec	Ryanair
18 Dec - 02 Jan	Vueling Airlines
19 Dec - 23 Dec	Wizz Air Malta
19 Dec - 02 Jan	Vueling Airlines

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 122€

Return flights