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

Return flights

29 Aug - 08 Sep	Ryanair
30 Aug - 07 Sep	Ryanair
24 Aug - 31 Aug	Ryanair
23 Aug - 31 Aug	Ryanair
29 Aug - 31 Aug	Ryanair
18 Aug - 26 Aug	TAP
27 Aug - 30 Aug	Norwegian
26 Aug - 30 Aug	Ryanair
21 Aug - 08 Sep	KLM
16 Aug - 31 Aug	British Airways
12 Aug - 01 Sep	Ryanair
19 Aug - 20 Aug	easyJet
18 Aug - 27 Aug	KLM
15 Aug - 31 Aug	Transavia France
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 716€

Return flights