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

Return flights

05 Dec - 09 Dec	Ryanair
06 Dec - 11 Dec	Ryanair
09 Dec - 13 Dec	Ryanair
06 Dec - 10 Dec	Ryanair
06 Dec - 09 Dec	easyJet
10 Dec - 13 Dec	Ryanair
11 Dec - 13 Dec	Ryanair
04 Dec - 06 Dec	Ryanair
13 Dec - 16 Dec	easyJet
04 Dec - 09 Dec	Ryanair
27 Dec - 01 Jan	Ryanair
29 Dec - 01 Jan	Vueling Airlines
29 Dec - 05 Jan	Ryanair
30 Dec - 03 Jan	Ryanair
20 Dec - 03 Jan	Ryanair
28 Dec - 01 Jan	Ryanair
27 Dec - 03 Jan	Ryanair
26 Dec - 03 Jan	Ryanair
29 Dec - 02 Jan	Scandinavian Airlines
29 Dec - 03 Jan	Vueling Airlines

Also check the deals for one-way flights from Lisbon 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 Lisbon to Riga in December from $162

Return flights