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

Return flights

30 Aug - 02 Sep	Ryanair
26 Aug - 02 Sep	Ryanair
27 Aug - 30 Aug	Norwegian Air Sweden AOC
26 Aug - 29 Aug	Ryanair
21 Aug - 28 Aug	Ryanair
26 Aug - 02 Sep	airBaltic	direct
26 Aug - 31 Aug	airBaltic
23 Aug - 26 Aug	Ryanair
23 Aug - 30 Aug	Ryanair
19 Aug - 23 Aug	Ryanair
18 Aug - 23 Aug	Finnair
30 Aug - 02 Sep	airBaltic	direct
18 Aug - 20 Aug	Finnair
23 Aug - 30 Aug	airBaltic	direct

Also check the deals for one-way flights from Riga to Sofia 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 Sofia in August from 236€

Return flights