Cheapest return flights from Riga to Porto in September from $220

Best time to book flights for Riga (RIX) to Porto (OPO) flights at AirHint

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

Return flights

17 Sep - 21 Sep Ryanair
06 Sep - 20 Sep Ryanair
03 Sep - 20 Sep Ryanair
20 Sep - 27 Sep Ryanair
26 Sep - 29 Sep Norwegian Air Sweden AOC
03 Sep - 17 Sep Ryanair
06 Sep - 13 Sep Ryanair
09 Sep - 16 Sep Ryanair
09 Sep - 17 Sep Ryanair
09 Sep - 15 Sep Ryanair
17 Sep - 01 Oct Ryanair
18 Sep - 02 Oct Ryanair
20 Sep - 08 Oct Ryanair
17 Sep - 01 Oct airBaltic direct

Also check the deals for one-way flights from Riga to Porto in September.

Skyscanner

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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