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

Return flights

30 Sep - 07 Oct	Air India
11 Sep - 24 Sep	Air France
18 Sep - 30 Sep	KLM
13 Sep - 21 Sep	Air France
19 Sep - 28 Sep	Qatar Airways
09 Sep - 19 Sep	KLM
01 Sep - 09 Sep	IndiGo
26 Sep - 04 Oct	IndiGo
17 Sep - 22 Sep	SWISS
04 Sep - 18 Sep	IndiGo
28 Sep - 10 Oct	IndiGo
26 Sep - 12 Oct	IndiGo
16 Sep - 16 Oct	SWISS
12 Sep - 19 Sep	Air France
01 Sep - 31 Oct	IndiGo
12 Sep - 20 Sep	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 672€

Return flights