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

Return flights

02 Dec - 06 Dec	Ryanair
10 Dec - 17 Dec	Ryanair
06 Dec - 10 Dec	Ryanair
06 Dec - 12 Dec	Ryanair
13 Dec - 20 Dec	Ryanair
06 Dec - 11 Dec	Ryanair
04 Dec - 09 Dec	Norwegian Air Sweden AOC
05 Dec - 08 Dec	Lufthansa
11 Dec - 18 Dec	Norwegian Air Sweden AOC
01 Dec - 08 Dec	Ryanair
29 Dec - 02 Jan	KLM
29 Dec - 01 Jan	KLM
23 Dec - 01 Jan	Ryanair
23 Dec - 04 Jan	Ryanair
27 Dec - 01 Jan	airBaltic
28 Dec - 01 Jan	Ryanair
30 Dec - 01 Jan	Ryanair
20 Dec - 01 Jan	LOT
20 Dec - 03 Jan	Ryanair
27 Dec - 03 Jan	Ryanair

Also check the deals for one-way flights from Riga to Lisbon 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 Riga to Lisbon in December from $187

Return flights