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

Return flights

01 Dec - 05 Dec	Vueling Airlines
08 Dec - 10 Dec	Ryanair
03 Dec - 06 Dec	Ryanair
04 Dec - 09 Dec	Vueling Airlines
07 Dec - 10 Dec	easyJet
11 Dec - 15 Dec	Ryanair
05 Dec - 12 Dec	Ryanair
04 Dec - 08 Dec	Vueling Airlines
06 Dec - 08 Dec	Ryanair
13 Dec - 27 Dec	Ryanair

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

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 December from $169

Return flights