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

Return flights

10 Dec - 24 Dec	KLM
05 Dec - 12 Dec	KLM
06 Dec - 12 Dec	KLM
03 Dec - 11 Dec	KLM
11 Dec - 17 Dec	KLM
03 Dec - 10 Dec	KLM
06 Dec - 10 Dec	SWISS
06 Dec - 09 Dec	SWISS
06 Dec - 08 Dec	SWISS
10 Dec - 19 Jan	KLM
04 Dec - 09 Dec	SWISS
31 Dec - 21 Jan	KLM
15 Dec - 09 Jan	Iberia
12 Dec - 12 Jan	Iberia
31 Dec - 09 Jan	KLM
16 Dec - 19 Jan	Iberia
15 Dec - 14 Jan	Iberia
04 Dec - 16 Jan	KLM
31 Dec - 28 Jan	Iberia
31 Dec - 11 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 195€

Return flights