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

Return flights

12 Aug - 29 Aug	Air France
24 Aug - 09 Sep	Turkish Airlines
25 Aug - 15 Sep	KLM
26 Aug - 29 Aug	Vueling Airlines
26 Aug - 30 Aug	Vueling Airlines
21 Aug - 05 Sep	Ryanair
22 Aug - 31 Aug	KLM
06 Aug - 23 Aug	Ryanair
09 Aug - 23 Aug	Ryanair
18 Aug - 30 Aug	KLM
14 Aug - 21 Aug	IndiGo
05 Aug - 25 Aug	IndiGo
04 Aug - 26 Aug	Lufthansa

Also check the deals for one-way flights from Porto to Singapore 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 Porto to Singapore in August from $831

Return flights