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

Return flights

11 Aug - 17 Aug	Etihad Airways
13 Aug - 27 Aug	Qatar Airways
08 Aug - 21 Aug	Etihad Airways
17 Aug - 24 Aug	Finnair
24 Aug - 31 Aug	Air India
05 Aug - 12 Sep	Lufthansa
17 Aug - 26 Aug	SWISS
26 Aug - 08 Sep	Emirates
30 Aug - 06 Sep	IndiGo
22 Aug - 05 Sep	IndiGo
23 Aug - 28 Aug	Emirates
18 Aug - 29 Aug	Emirates
02 Aug - 09 Aug	IndiGo
08 Aug - 10 Aug	Qatar Airways
31 Aug - 04 Sep	Qatar Airways
29 Aug - 02 Sep	Lufthansa

Also check the deals for one-way flights from Singapore to Lisbon in August.

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 August from $895

Return flights