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

Return flights

31 Aug - 07 Sep	TAP
25 Aug - 10 Sep	TAP
21 Aug - 31 Aug	TAP
19 Aug - 31 Aug	TAP
18 Aug - 31 Aug	TAP
01 Aug - 08 Aug	TAP
21 Aug - 29 Aug	TAP
10 Aug - 31 Aug	TAP
08 Aug - 18 Aug	Royal Air Maroc
31 Aug - 09 Sep	TAP
16 Aug - 28 Aug	TAP

Also check the deals for one-way flights from Porto to Sao Tome 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 Sao Tome in August from $1076

Return flights