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

Return flights

26 Aug - 06 Sep	Air India
28 Aug - 06 Sep	China Eastern
17 Aug - 26 Aug	Air France
26 Aug - 30 Aug	China Eastern
17 Aug - 18 Aug	British Airways
24 Aug - 24 Sep	Air France
22 Aug - 20 Sep	Qatar Airways
22 Aug - 05 Sep	Air France
20 Aug - 27 Aug	Finnair
30 Aug - 31 Aug	IndiGo
28 Aug - 08 Sep	Qatar Airways
26 Aug - 08 Sep	Emirates
18 Aug - 29 Aug	Emirates
28 Aug - 07 Sep	British Airways

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 732€

Return flights