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

Return flights

29 Sep - 14 Oct	Etihad Airways
16 Sep - 23 Sep	Etihad Airways
29 Sep - 06 Oct	IndiGo
09 Sep - 15 Sep	Air France
23 Sep - 01 Oct	Qatar Airways
15 Sep - 25 Sep	SWISS
20 Sep - 29 Sep	Qatar Airways
27 Sep - 05 Oct	Qatar Airways
18 Sep - 25 Sep	Turkish Airlines
12 Sep - 19 Sep	Air India
22 Sep - 28 Sep	Qatar Airways
08 Sep - 13 Sep	Qatar Airways
13 Sep - 22 Sep	Gulf Air
15 Sep - 21 Sep	SWISS
29 Sep - 05 Oct	SWISS
27 Sep - 03 Oct	Qatar Airways
01 Sep - 31 Oct	IndiGo
21 Sep - 02 Oct	British Airways
20 Sep - 02 Oct	British Airways
26 Sep - 11 Oct	British Airways

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 550€

Return flights