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

Return flights

09 Sep - 16 Sep	Qatar Airways
08 Sep - 13 Sep	SWISS
24 Sep - 01 Oct	Air France
27 Sep - 28 Sep	IndiGo
09 Sep - 13 Sep	KLM
09 Sep - 21 Sep	KLM
08 Sep - 21 Oct	Air France
26 Sep - 04 Oct	IndiGo
12 Sep - 20 Sep	SWISS
30 Sep - 09 Oct	Turkish Airlines
05 Sep - 12 Sep	Finnair
05 Sep - 13 Sep	SWISS
26 Sep - 10 Oct	IndiGo
24 Sep - 14 Oct	TAP
05 Sep - 07 Sep	TAP

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 569€

Return flights