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

Return flights

02 Dec - 22 Dec	Iberia
02 Dec - 17 Dec	KLM
06 Dec - 21 Dec	Turkish Airlines
05 Dec - 22 Dec	Turkish Airlines
02 Dec - 23 Dec	KLM
24 Dec - 31 Dec	Vueling Airlines
01 Dec - 22 Dec	SWISS
01 Dec - 23 Dec	Turkish Airlines
01 Dec - 14 Dec	Turkish Airlines
02 Dec - 15 Dec	KLM
27 Dec - 12 Jan	Turkish Airlines
27 Dec - 09 Jan	Turkish Airlines
28 Dec - 10 Jan	Turkish Airlines
29 Dec - 07 Jan	KLM
27 Dec - 10 Jan	Turkish Airlines
26 Dec - 09 Jan	KLM
25 Dec - 08 Jan	KLM
26 Dec - 10 Jan	KLM
27 Dec - 02 Jan	KLM
28 Dec - 04 Jan	KLM

Also check the deals for one-way flights from Porto to Bangkok 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 Porto to Bangkok in December from 657€

Return flights