AirHint found the following cheapest one-way flights from Riga (RIX) to Porto (OPO) in September 2026 (see full year).
One-Way flights
| 19 Sep | Norwegian Air Sweden AOC | ||
| 14 Sep | LOT | ||
| 05 Sep | LOT | ||
| 13 Sep | Ryanair | ||
| 19 Sep | airBaltic | direct | |
| 05 Sep | airBaltic | direct |
Also check the deals for return flights from Riga to Porto in September.
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