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

Return flights

02 Sep - 15 Sep	China Eastern
22 Sep - 01 Oct	IndiGo
20 Sep - 27 Sep	Air France
15 Sep - 30 Sep	Air France
30 Sep - 09 Oct	IndiGo
17 Sep - 22 Sep	SWISS
09 Sep - 19 Sep	Air France
04 Sep - 18 Sep	SWISS
19 Sep - 23 Sep	IndiGo
12 Sep - 15 Sep	Air France
16 Sep - 16 Oct	IndiGo
19 Sep - 30 Oct	Iberojet
26 Sep - 04 Oct	IndiGo
13 Sep - 21 Sep	IndiGo
12 Sep - 21 Sep	Air France

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 $815

Return flights