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

Return flights

10 Dec - 17 Dec	Vueling Airlines
02 Dec - 03 Dec	Vueling Airlines
12 Dec - 14 Dec	TAP
06 Dec - 13 Dec	Vueling Airlines
10 Dec - 13 Dec	Vueling Airlines
12 Dec - 15 Dec	TAP
06 Dec - 10 Dec	Vueling Airlines
15 Dec - 19 Dec	TAP
09 Dec - 16 Dec	TAP
02 Dec - 09 Dec	Vueling Airlines
31 Dec - 07 Jan	TAP
17 Dec - 28 Jan	Vueling Airlines
31 Dec - 19 Jan	Vueling Airlines
31 Dec - 13 Jan	Vueling Airlines
31 Dec - 09 Jan	Vueling Airlines
28 Dec - 01 Jan	TAP
31 Dec - 20 Jan	Vueling Airlines
31 Dec - 15 Jan	Vueling Airlines
31 Dec - 06 Jan	TAP
15 Dec - 06 Jan	TAP

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 133€

Return flights