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

One-Way flights

03 Aug	Ryanair
14 Aug	Ryanair
05 Aug	Norwegian Air Sweden AOC
11 Aug	Norwegian Air Sweden AOC
13 Aug	Norwegian Air Sweden AOC
17 Aug	Ryanair
10 Aug	Ryanair
06 Aug	Ryanair
24 Aug	Ryanair
23 Aug	Norwegian Air Sweden AOC

Also check the deals for return flights from Riga to Porto 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 one-way flights from Riga to Porto in August from 81€

One-Way flights