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

Return flights

04 Dec - 10 Dec	KLM
03 Dec - 08 Dec	KLM
02 Dec - 09 Dec	KLM
03 Dec - 16 Dec	KLM
05 Dec - 09 Dec	KLM
03 Dec - 24 Dec	KLM
06 Dec - 09 Dec	SWISS
10 Dec - 15 Dec	KLM
05 Dec - 08 Dec	KLM
10 Dec - 17 Dec	KLM
06 Dec - 20 Jan	KLM
31 Dec - 07 Jan	KLM
31 Dec - 06 Jan	KLM
16 Dec - 07 Jan	KLM
12 Dec - 07 Jan	ITA Airways
14 Dec - 20 Jan	KLM
18 Dec - 11 Jan	ITA Airways
31 Dec - 05 Jan	KLM
31 Dec - 01 Jan	Luxair
19 Dec - 11 Jan	ITA Airways

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 $237

Return flights