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

Return flights

27 Sep - 02 Oct	Air India
27 Sep - 03 Oct	Air India
08 Sep - 19 Sep	Hainan Airlines
08 Sep - 18 Sep	Thai VietJet Air
10 Sep - 20 Sep	IndiGo
12 Sep - 22 Sep	Thai Lion Air
06 Sep - 13 Sep	Thai VietJet Air
18 Sep - 08 Oct	Air France
25 Sep - 09 Oct	Air France
15 Sep - 17 Sep	SWISS
26 Sep - 29 Sep	Turkish Airlines
07 Sep - 13 Sep	Air France
18 Sep - 11 Oct	Air France
26 Sep - 04 Oct	KLM
12 Sep - 21 Sep	IndiGo
21 Sep - 03 Oct	Air France
13 Sep - 21 Sep	Air France
16 Sep - 16 Oct	SWISS

Also check the deals for one-way flights from Bangkok to Lisbon 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 Bangkok to Lisbon in September from 640€

Return flights