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

Return flights

30 Aug - 08 Sep	Ryanair
31 Aug - 04 Sep	Ryanair
20 Aug - 27 Aug	Ryanair
23 Aug - 30 Aug	Ryanair
08 Aug - 22 Aug	Ryanair
04 Aug - 06 Sep	Finnair
15 Aug - 18 Aug	Ryanair
01 Aug - 04 Aug	Finnair
07 Aug - 11 Aug	Norwegian Air Sweden AOC
21 Aug - 26 Aug	Norwegian Air Sweden AOC
15 Aug - 21 Aug	Ryanair
09 Aug - 15 Aug	Finnair
13 Aug - 16 Aug	Ryanair
22 Aug - 05 Sep	airBaltic	direct
30 Aug - 12 Sep	airBaltic
30 Aug - 06 Sep	airBaltic
23 Aug - 06 Sep	airBaltic

Also check the deals for one-way flights from Riga to Lisbon 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 Riga to Lisbon in August from $280

Return flights