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

Return flights

11 Dec - 15 Dec	Luxair
05 Dec - 07 Dec	Iberia
02 Dec - 09 Dec	KLM
14 Dec - 31 Dec	Iberia
01 Dec - 03 Dec	Iberia
09 Dec - 10 Dec	Iberia
15 Dec - 19 Dec	Iberia
11 Dec - 12 Dec	Iberia
09 Dec - 11 Dec	Iberia
05 Dec - 08 Dec	Luxair
31 Dec - 07 Jan	KLM
26 Dec - 01 Jan	Iberia
18 Dec - 11 Jan	KLM
23 Dec - 11 Jan	KLM
15 Dec - 05 Jan	Iberia
27 Dec - 11 Jan	KLM
30 Dec - 02 Jan	Iberia
03 Dec - 04 Jan	Iberia
15 Dec - 04 Jan	Iberia
04 Dec - 05 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 202€

Return flights