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

Return flights

06 Dec - 10 Dec	Ryanair
06 Dec - 11 Dec	Ryanair
01 Dec - 04 Dec	Ryanair
05 Dec - 07 Dec	Ryanair
11 Dec - 13 Dec	Ryanair
04 Dec - 06 Dec	Wizz Air Malta
20 Dec - 04 Jan	Vueling Airlines
05 Dec - 08 Dec	Lufthansa
06 Dec - 11 Dec	airBaltic	direct
11 Dec - 13 Dec	airBaltic	direct
17 Dec - 20 Dec	Ryanair
20 Dec - 03 Jan	Ryanair
27 Dec - 01 Jan	easyJet
29 Dec - 02 Jan	Scandinavian Airlines
27 Dec - 03 Jan	LOT
11 Dec - 03 Jan	airBaltic	direct
28 Dec - 04 Jan	Ryanair
20 Dec - 03 Jan	airBaltic	direct
27 Dec - 01 Jan	airBaltic	direct
27 Dec - 03 Jan	airBaltic	direct

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 135€

Return flights