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

Return flights

30 Aug - 06 Sep	Ryanair
30 Aug - 13 Sep	Ryanair
22 Aug - 25 Aug	Ryanair
22 Aug - 06 Sep	Ryanair
20 Aug - 27 Aug	TAP
19 Aug - 31 Aug	Ryanair
21 Aug - 08 Sep	KLM
21 Aug - 28 Aug	Ryanair
19 Aug - 02 Sep	KLM

Also check the deals for one-way flights from Porto to Bangkok in August.

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 August from $886

Return flights