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

Return flights

06 Dec - 14 Dec	SWISS
06 Dec - 15 Dec	SWISS
06 Dec - 09 Dec	SWISS
06 Dec - 10 Dec	SWISS
06 Dec - 12 Dec	SWISS
02 Dec - 09 Dec	SWISS
03 Dec - 10 Dec	Lufthansa
03 Dec - 09 Dec	Lufthansa
10 Dec - 14 Dec	Lufthansa
10 Dec - 12 Dec	Lufthansa
03 Dec - 14 Jan	KLM
31 Dec - 02 Jan	Luxair
31 Dec - 12 Jan	KLM
13 Dec - 05 Jan	ITA Airways
31 Dec - 04 Jan	Luxair
24 Dec - 04 Jan	Luxair
31 Dec - 09 Jan	Luxair
31 Dec - 07 Jan	Luxair
26 Dec - 26 Jan	KLM
30 Dec - 08 Jan	KLM

Also check the deals for one-way flights from London to Lisbon 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 London to Lisbon in December from $234

Return flights