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

Return flights

03 Dec - 17 Dec	KLM
03 Dec - 07 Dec	KLM
03 Dec - 10 Dec	KLM
06 Dec - 10 Dec	KLM
06 Dec - 14 Dec	KLM
09 Dec - 16 Dec	KLM
04 Dec - 11 Dec	Iberia
11 Dec - 16 Dec	Iberia
11 Dec - 15 Dec	Iberia
10 Dec - 12 Dec	Iberia
11 Dec - 07 Jan	Iberia
29 Dec - 14 Jan	KLM
31 Dec - 11 Jan	KLM
16 Dec - 11 Jan	Iberia
15 Dec - 11 Jan	Iberia
12 Dec - 11 Jan	ITA Airways
15 Dec - 09 Jan	Iberia
30 Dec - 01 Jan	Luxair
29 Dec - 01 Jan	KLM
13 Dec - 12 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.

Book a cheap hotel in Porto

Cheap car rent in Porto

Cheapest return flights from London to Porto in December from 182€

Return flights