AirHint found the following cheapest return flights from Riga (RIX) to Porto (OPO) in September 2026 (see full year).
Return flights
| 30 Sep - 03 Oct | Ryanair | ||
| 19 Sep - 26 Sep | airBaltic | ||
| 16 Sep - 26 Sep | airBaltic | direct | |
| 30 Sep - 03 Oct | airBaltic | direct | |
| 19 Sep - 26 Sep | airBaltic | direct | |
| 20 Sep - 27 Sep | KLM |
Also check the deals for one-way flights from Riga to Porto in September.
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