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

Return flights

30 Aug - 01 Sep	Aer Lingus
28 Aug - 30 Aug	Norwegian Air Sweden AOC
29 Aug - 01 Sep	Finnair
25 Aug - 01 Sep	Finnair
28 Aug - 31 Aug	Norwegian Air Sweden AOC
23 Aug - 19 Sep	Scandinavian Airlines
08 Aug - 15 Aug	Finnair
11 Aug - 23 Aug	Finnair
11 Aug - 15 Aug	Finnair
11 Aug - 16 Aug	Finnair
08 Aug - 16 Aug	Finnair
27 Aug - 30 Aug	Norwegian
15 Aug - 23 Aug	Finnair
26 Aug - 30 Aug	Ryanair
26 Aug - 02 Sep	Lufthansa
23 Aug - 19 Sep	airBaltic	direct
30 Aug - 01 Sep	airBaltic	direct
24 Aug - 20 Sep	airBaltic
25 Aug - 20 Sep	airBaltic

Also check the deals for one-way flights from Lisbon to Riga in August.

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 August from 269€

Return flights