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

Return flights

12 Dec - 15 Dec	Ryanair
01 Dec - 05 Dec	Ryanair
11 Dec - 16 Dec	Ryanair
12 Dec - 13 Dec	Ryanair
01 Dec - 07 Dec	Ryanair
05 Dec - 10 Dec	Ryanair
10 Dec - 15 Dec	Ryanair
03 Dec - 06 Dec	Ryanair
06 Dec - 13 Dec	Ryanair
08 Dec - 10 Dec	Ryanair
15 Dec - 05 Jan	Ryanair
31 Dec - 04 Jan	Vueling Airlines
19 Dec - 05 Jan	Vueling Airlines
21 Dec - 06 Jan	easyJet
21 Dec - 05 Jan	Ryanair
25 Dec - 04 Jan	airBaltic
31 Dec - 05 Jan	Ryanair
29 Dec - 01 Jan	Ryanair
13 Dec - 03 Jan	Norwegian Air Sweden AOC
27 Dec - 01 Jan	TAP

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 134€

Return flights