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

Return flights

28 Dec - 31 Dec	Iberia
30 Dec - 08 Jan	Iberia
30 Dec - 31 Dec	Iberia
31 Dec - 31 Dec	Iberia
29 Dec - 31 Dec	Iberia
31 Dec - 12 Jan	Iberia
30 Dec - 09 Jan	Iberia
31 Dec - 09 Jan	Iberia
30 Dec - 07 Jan	Iberia
31 Dec - 07 Jan	Iberia
28 Dec - 07 Jan	Iberia
29 Dec - 31 Jan	KLM
29 Dec - 01 Jan	KLM
27 Dec - 31 Dec	KLM
28 Dec - 30 Dec	Iberia
27 Dec - 28 Dec	KLM
28 Dec - 01 Jan	KLM
27 Dec - 30 Dec	KLM
27 Dec - 29 Dec	KLM
29 Dec - 30 Dec	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 218€

Return flights