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

Return flights

11 Aug - 05 Sep	TAP
29 Aug - 02 Sep	Ryanair
26 Aug - 06 Sep	Ryanair
30 Aug - 01 Sep	Aer Lingus
21 Aug - 26 Aug	Finnair
28 Aug - 31 Aug	Norwegian Air Sweden AOC
29 Aug - 01 Sep	Ryanair
07 Aug - 14 Aug	Finnair
13 Aug - 20 Aug	Finnair
20 Aug - 27 Aug	Finnair
11 Aug - 18 Aug	Ryanair
25 Aug - 01 Sep	Finnair
28 Aug - 30 Aug	Norwegian Air Sweden AOC
16 Aug - 22 Aug	Finnair
06 Aug - 13 Aug	Ryanair
13 Aug - 25 Aug	Ryanair
08 Aug - 02 Sep	Finnair

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.

Book a cheap hotel in Riga

Cheap car rent in Riga

Cheapest return flights from Lisbon to Riga in August from $322

Return flights