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
25 Aug - 15 Sep	Vueling Airlines
05 Aug - 12 Aug	Ryanair
21 Aug - 05 Sep	Ryanair
06 Aug - 23 Aug	Ryanair
16 Aug - 21 Aug	Ryanair
23 Aug - 30 Aug	KLM
13 Aug - 20 Aug	IndiGo
17 Aug - 01 Sep	KLM
14 Aug - 20 Aug	TAP
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 708€

Return flights