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

Return flights

10 Sep - 24 Sep	SWISS
08 Sep - 22 Sep	SWISS
01 Sep - 17 Sep	Finnair
08 Sep - 15 Sep	KLM
11 Sep - 30 Sep	KLM
29 Sep - 14 Oct	SWISS
19 Sep - 29 Sep	SWISS
26 Sep - 26 Oct	SWISS
29 Sep - 03 Oct	easyJet
28 Sep - 03 Oct	Etihad Airways
27 Sep - 03 Oct	TAP
15 Sep - 20 Sep	Vueling Airlines
01 Sep - 08 Sep	Finnair
23 Sep - 17 Oct	Air France
24 Sep - 18 Oct	SWISS

Also check the deals for one-way flights from Lisbon to Singapore 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 Lisbon to Singapore in September from $693

Return flights