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

Return flights

16 Sep - 29 Sep	Ryanair
09 Sep - 16 Sep	Ryanair
16 Sep - 23 Sep	easyJet
11 Sep - 21 Sep	Ryanair
04 Sep - 16 Sep	Ryanair
05 Sep - 21 Sep	Ryanair
18 Sep - 30 Sep	Air Europa
28 Sep - 13 Oct	Ryanair
22 Sep - 18 Oct	Air Europa
27 Sep - 11 Oct	Air Europa
28 Sep - 04 Oct	Wizz Air Malta
15 Sep - 19 Sep	Ryanair
09 Sep - 23 Sep	KLM
21 Sep - 29 Sep	KLM
19 Sep - 06 Oct	Lufthansa
26 Sep - 13 Oct	SWISS
29 Sep - 31 Oct	SWISS

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.

Book a cheap hotel in Bangkok

Cheap car rent in Bangkok

Cheapest return flights from Porto to Bangkok in September from 617€

Return flights