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

Return flights

10 Dec - 16 Dec	Ryanair
02 Dec - 06 Dec	Ryanair
02 Dec - 10 Dec	Ryanair
03 Dec - 06 Dec	Ryanair
13 Dec - 16 Dec	Ryanair
08 Dec - 10 Dec	Ryanair
11 Dec - 18 Dec	Ryanair
01 Dec - 09 Dec	Ryanair
06 Dec - 13 Dec	Ryanair
08 Dec - 13 Dec	Ryanair
20 Dec - 05 Jan	Ryanair
13 Dec - 01 Jan	airBaltic	direct
26 Dec - 01 Jan	Ryanair
31 Dec - 03 Jan	Ryanair
27 Dec - 01 Jan	TAP
20 Dec - 07 Jan	Vueling Airlines
29 Dec - 03 Jan	LOT
29 Dec - 02 Jan	Ryanair
21 Dec - 05 Jan	Wizz Air Malta
27 Dec - 03 Jan	LOT

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 $152

Return flights