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

Return flights

27 Aug - 30 Aug	Norwegian
23 Aug - 30 Aug	Norwegian Air Sweden AOC
22 Aug - 10 Sep	Norwegian
22 Aug - 27 Aug	Norwegian
23 Aug - 27 Aug	Norwegian Air Sweden AOC
25 Aug - 30 Aug	Norwegian
26 Aug - 04 Sep	Ryanair
22 Aug - 29 Aug	Norwegian
20 Aug - 23 Aug	Norwegian
28 Aug - 08 Sep	Ryanair
28 Aug - 01 Sep	Ryanair
26 Aug - 30 Aug	Ryanair
14 Aug - 19 Aug	Ryanair
13 Aug - 05 Sep	easyJet
14 Aug - 20 Aug	Ryanair
30 Aug - 03 Sep	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 226€

Return flights