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

Return flights

15 Sep - 23 Sep	Ryanair
09 Sep - 30 Oct	Etihad Airways
24 Sep - 15 Oct	TAP
08 Sep - 18 Sep	Ryanair
17 Sep - 24 Sep	TAP
20 Sep - 28 Sep	TAP
30 Sep - 15 Oct	Iberia
09 Sep - 17 Sep	Ryanair
15 Sep - 21 Sep	easyJet
23 Sep - 14 Oct	Iberia
10 Sep - 24 Sep	TAP
03 Sep - 18 Sep	TAP
29 Sep - 09 Oct	easyJet
09 Sep - 18 Sep	TAP
04 Sep - 18 Sep	TAP
23 Sep - 04 Oct	easyJet
23 Sep - 12 Oct	KLM
27 Sep - 05 Oct	KLM
23 Sep - 15 Oct	KLM
22 Sep - 04 Oct	easyJet

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 $736

Return flights