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

Return flights

20 Aug - 21 Sep	Ryanair
30 Aug - 05 Sep	Ryanair
27 Aug - 02 Sep	Ryanair
21 Aug - 28 Aug	Norwegian Air Sweden AOC
30 Aug - 06 Sep	Ryanair
18 Aug - 19 Sep	Ryanair
26 Aug - 02 Sep	Scandinavian Airlines
29 Aug - 13 Sep	airBaltic
30 Aug - 15 Sep	Ryanair
19 Aug - 24 Aug	Ryanair
30 Aug - 08 Sep	Ryanair
25 Aug - 03 Sep	airBaltic
20 Aug - 25 Aug	Ryanair
11 Aug - 24 Aug	Norwegian Air Sweden AOC
21 Aug - 26 Aug	Norwegian Air Sweden AOC
24 Aug - 31 Aug	Ryanair
19 Aug - 29 Aug	Ryanair
11 Aug - 16 Aug	Finnair
06 Aug - 19 Aug	Ryanair
06 Aug - 11 Aug	Ryanair

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 220€

Return flights