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

Return flights

29 Aug - 04 Sep	Ryanair
27 Aug - 11 Sep	Ryanair
30 Aug - 06 Sep	Ryanair
19 Aug - 04 Sep	Ryanair
30 Aug - 05 Sep	Ryanair
27 Aug - 31 Aug	Ryanair
24 Aug - 31 Aug	Ryanair
27 Aug - 30 Aug	Ryanair
23 Aug - 29 Aug	Finnair
28 Aug - 31 Aug	Finnair
26 Aug - 02 Sep	Ryanair
24 Aug - 30 Aug	Ryanair
19 Aug - 26 Aug	Ryanair
25 Aug - 30 Aug	Ryanair
23 Aug - 26 Aug	Finnair
22 Aug - 30 Aug	Finnair
25 Aug - 02 Sep	airBaltic
30 Aug - 08 Sep	airBaltic	direct

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 $305

Return flights