AirHint found the following cheapest return flights from Riga (RIX) to Bucharest (OTP) in September 2025 (see full year).

Return flights

10 Sep - 14 Sep	Norwegian Air Sweden AOC
17 Sep - 20 Sep	Norwegian Air Sweden AOC
25 Sep - 02 Oct	Ryanair
17 Sep - 21 Sep	Norwegian Air Sweden AOC
19 Sep - 22 Sep	airBaltic	direct
03 Sep - 10 Sep	Norwegian Air Sweden AOC
16 Sep - 19 Sep	Ryanair
17 Sep - 24 Sep	airBaltic
05 Sep - 08 Sep	Norwegian Air Sweden AOC
08 Sep - 15 Sep	airBaltic
17 Sep - 24 Sep	airBaltic	direct

Also check the deals for one-way flights from Riga to Bucharest in September.

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 Bucharest in September from 120€

Return flights