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

Return flights

05 Dec - 08 Dec	Luxair
11 Dec - 14 Dec	Luxair
04 Dec - 07 Dec	Luxair
05 Dec - 09 Dec	SWISS
15 Dec - 18 Dec	KLM
24 Dec - 28 Dec	KLM
31 Dec - 02 Jan	Luxair
26 Dec - 29 Dec	Luxair
16 Dec - 19 Dec	Luxair
26 Dec - 31 Dec	Luxair
17 Dec - 07 Jan	Lufthansa
18 Dec - 29 Dec	Lufthansa
26 Dec - 06 Jan	Luxair
28 Dec - 02 Jan	Luxair
26 Dec - 02 Jan	Luxair
19 Dec - 05 Jan	KLM
26 Dec - 04 Jan	KLM
19 Dec - 06 Jan	KLM
17 Dec - 04 Jan	KLM
20 Dec - 06 Jan	KLM

Also check the deals for one-way flights from London to Porto 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 Porto in December from $267

Return flights