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

Return flights

20 Aug - 17 Sep	SWISS
28 Aug - 08 Sep	Ryanair
26 Aug - 15 Sep	Ryanair
30 Aug - 14 Sep	Ryanair
31 Aug - 14 Sep	Ryanair
21 Aug - 08 Sep	KLM
19 Aug - 18 Sep	SWISS
31 Aug - 07 Sep	Ryanair
30 Aug - 08 Sep	Air France
01 Aug - 16 Aug	Ryanair
15 Aug - 13 Sep	Ryanair
05 Aug - 18 Aug	easyJet
06 Aug - 13 Aug	Ryanair
20 Aug - 27 Aug	Ryanair
13 Aug - 27 Aug	Ryanair
19 Aug - 22 Aug	Ryanair
19 Aug - 30 Aug	Ryanair
18 Aug - 30 Aug	KLM
12 Aug - 26 Aug	Ryanair
16 Aug - 28 Aug	easyJet

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 $819

Return flights