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

Return flights

07 Dec - 15 Dec	TAP
07 Dec - 14 Dec	TAP
07 Dec - 13 Dec	TAP
07 Dec - 08 Dec	TAP
28 Dec - 08 Jan	TAP
31 Dec - 08 Jan	TAP
31 Dec - 07 Jan	TAP
14 Dec - 15 Dec	TAP
07 Dec - 17 Dec	TAP
14 Dec - 17 Dec	TAP
16 Dec - 17 Dec	TAP
14 Dec - 16 Dec	TAP
30 Dec - 13 Jan	TAP
31 Dec - 14 Jan	Vueling Airlines
09 Dec - 16 Dec	TAP
07 Dec - 10 Jan	TAP
31 Dec - 09 Jan	TAP
28 Dec - 07 Jan	TAP
31 Dec - 13 Jan	Vueling Airlines
31 Dec - 16 Jan	Vueling Airlines

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 156€

Return flights