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

Return flights

22 Sep - 30 Sep	Pegasus Airlines
25 Sep - 30 Sep	Pegasus Airlines
30 Sep - 01 Oct	AJet
23 Sep - 30 Sep	AJet
30 Sep - 02 Oct	AJet
25 Sep - 27 Sep	Pegasus Airlines
21 Sep - 23 Sep	AJet
22 Sep - 29 Sep	Pegasus Airlines
21 Sep - 24 Sep	Pegasus Airlines
28 Sep - 30 Sep	Pegasus Airlines
20 Sep - 23 Sep	Pegasus Airlines
20 Sep - 28 Sep	AJet
28 Sep - 07 Oct	Pegasus Airlines
28 Sep - 07 Oct	Turkish Airlines	direct
30 Sep - 02 Oct	Turkish Airlines	direct
30 Sep - 01 Oct	Turkish Airlines	direct

Also check the deals for one-way flights from Istanbul to Riga 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 Istanbul to Riga in September from 141€

Return flights