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

Return flights

30 Sep - 30 Oct	Ryanair
30 Sep - 26 Oct	Ryanair
19 Sep - 06 Oct	Ryanair
27 Sep - 30 Sep	Ryanair
17 Sep - 30 Sep	Ryanair
23 Sep - 30 Sep	easyJet
19 Sep - 23 Sep	Ryanair
16 Sep - 23 Sep	easyJet
17 Sep - 24 Sep	Ryanair
09 Sep - 23 Sep	Ryanair
22 Sep - 17 Oct	Ryanair
26 Sep - 30 Sep	Volotea
21 Sep - 10 Oct	Ryanair
26 Sep - 03 Oct	Ryanair
15 Sep - 22 Sep	easyJet
26 Sep - 11 Oct	Ryanair
13 Sep - 20 Sep	Ryanair
28 Sep - 16 Oct	easyJet
28 Sep - 10 Oct	easyJet
28 Sep - 05 Oct	KLM

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

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 September from 520€

Return flights