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

Return flights

30 Aug - 31 Aug	Ryanair
26 Aug - 02 Sep	airBaltic	direct
23 Aug - 30 Aug	Ryanair
14 Aug - 19 Aug	Ryanair
19 Aug - 26 Aug	Ryanair
12 Aug - 16 Aug	Ryanair
16 Aug - 23 Aug	LOT
24 Aug - 30 Aug	Ryanair
15 Aug - 19 Aug	LOT
05 Aug - 09 Aug	LOT
15 Aug - 17 Aug	LOT
30 Aug - 06 Sep	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 211€

Return flights