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

Return flights

19 Aug - 18 Sep	Austrian Airlines
30 Aug - 13 Sep	Ryanair
21 Aug - 08 Sep	KLM
21 Aug - 09 Sep	SWISS
24 Aug - 10 Sep	KLM
09 Aug - 16 Aug	easyJet
02 Aug - 16 Aug	Ryanair
08 Aug - 15 Aug	Ryanair
01 Aug - 01 Sep	Ryanair
05 Aug - 18 Aug	easyJet
07 Aug - 29 Aug	transavia
08 Aug - 29 Aug	Ryanair
02 Aug - 15 Aug	Ryanair
02 Aug - 18 Aug	easyJet
23 Aug - 30 Aug	IndiGo
11 Aug - 25 Aug	IndiGo
19 Aug - 02 Sep	KLM
18 Aug - 01 Sep	Lufthansa

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 733€

Return flights