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

One-Way flights

09 Sep	Norwegian Air Sweden AOC
10 Sep	Norwegian Air Sweden AOC
01 Sep	Norwegian Air Sweden AOC
02 Sep	Norwegian Air Sweden AOC
06 Sep	Norwegian Air Sweden AOC
16 Sep	Norwegian Air Sweden AOC
04 Sep	Norwegian Air Sweden AOC
20 Sep	Norwegian Air Sweden AOC
26 Sep	Norwegian Air Sweden AOC
29 Sep	Norwegian Air Sweden AOC

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 59€

One-Way flights