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

Return flights

25 Sep - 08 Oct	Air India
23 Sep - 30 Sep	Turkish Airlines
25 Sep - 30 Sep	Turkish Airlines
26 Sep - 30 Sep	Turkish Airlines
26 Sep - 05 Oct	Air France
26 Sep - 04 Oct	Qatar Airways
25 Sep - 10 Oct	Iberia
29 Sep - 05 Oct	Air France
19 Sep - 29 Sep	SWISS
27 Sep - 30 Sep	Iberia
21 Sep - 23 Sep	SWISS
23 Sep - 23 Sep	KLM
23 Sep - 28 Sep	Air France

Also check the deals for one-way flights from Singapore 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 Singapore to Lisbon in September from $730

Return flights