AirHint found the following cheapest one-way flights from Riga (RIX) to Istanbul (IST) in September 2025 (see full year).

One-Way flights

04 Sep	Norwegian Air Sweden AOC
24 Sep	Norwegian Air Sweden AOC
10 Sep	Norwegian Air Sweden AOC
12 Sep	Norwegian Air Sweden AOC
09 Sep	Norwegian Air Sweden AOC
03 Sep	Norwegian Air Sweden AOC
27 Sep	Norwegian Air Sweden AOC
03 Sep	airBaltic	direct
10 Sep	airBaltic	direct
01 Sep	airBaltic	direct

Also check the deals for return flights from Riga to Istanbul 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 one-way flights from Riga to Istanbul in September from 82€

One-Way flights