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

Return flights

15 Dec - 19 Dec	Iberia
28 Dec - 31 Dec	Iberia
24 Dec - 31 Dec	Iberia
05 Dec - 07 Dec	Iberia
04 Dec - 08 Dec	Luxair
05 Dec - 08 Dec	Iberia
11 Dec - 12 Dec	Iberia
05 Dec - 05 Dec	Iberia
04 Dec - 05 Dec	Iberia
29 Dec - 12 Jan	Iberia
13 Dec - 15 Dec	Luxair
29 Dec - 01 Jan	Iberia
26 Dec - 01 Jan	Iberia
27 Dec - 01 Jan	Luxair
30 Dec - 04 Jan	Iberia
30 Dec - 02 Jan	Iberia
24 Dec - 02 Jan	KLM
22 Dec - 01 Jan	KLM
25 Dec - 01 Jan	Luxair
29 Dec - 04 Jan	Iberia

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 196€

Return flights