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

Return flights

16 Sep - 30 Sep	Ryanair
02 Sep - 30 Oct	TAP
15 Sep - 22 Sep	Ryanair
04 Sep - 16 Sep	TAP
18 Sep - 24 Sep	easyJet
15 Sep - 26 Sep	Vueling Airlines
18 Sep - 30 Sep	TAP
03 Sep - 30 Oct	Etihad Airways
02 Sep - 09 Sep	Wizz Air Malta
04 Sep - 30 Sep	TAP
22 Sep - 29 Sep	easyJet
15 Sep - 28 Sep	easyJet
27 Sep - 05 Oct	TAP
27 Sep - 09 Oct	TAP
25 Sep - 02 Oct	KLM
06 Sep - 04 Oct	KLM
20 Sep - 03 Oct	KLM
28 Sep - 10 Oct	Air France
26 Sep - 24 Oct	KLM
26 Sep - 10 Oct	KLM

Also check the deals for one-way flights from Lisbon 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 Lisbon to Bangkok in September from 579€

Return flights