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

Return flights

28 Aug - 02 Sep	Ryanair
27 Aug - 02 Sep	Norwegian
27 Aug - 28 Aug	Norwegian Air Sweden AOC
01 Aug - 03 Aug	Ryanair
06 Aug - 16 Aug	Ryanair
01 Aug - 05 Aug	Ryanair
01 Aug - 04 Aug	Ryanair
23 Aug - 27 Aug	Norwegian Air Sweden AOC
02 Aug - 06 Aug	Ryanair
26 Aug - 04 Sep	Ryanair
23 Aug - 27 Aug	airBaltic	direct
02 Aug - 06 Aug	airBaltic	direct
06 Aug - 16 Aug	airBaltic	direct

Also check the deals for one-way flights from Porto to Riga 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 Riga in August from 233€

Return flights