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

Return flights

08 Sep - 12 Sep	Pegasus Airlines	direct
10 Sep - 13 Sep	Pegasus Airlines	direct
17 Sep - 19 Sep	Pegasus Airlines	direct
13 Sep - 17 Sep	Pegasus Airlines	direct
10 Sep - 11 Sep	Pegasus Airlines
25 Sep - 28 Sep	Pegasus Airlines
25 Sep - 29 Sep	Pegasus Airlines
26 Sep - 28 Sep	Pegasus Airlines	direct
26 Sep - 29 Sep	Pegasus Airlines	direct
02 Sep - 06 Sep	Pegasus Airlines

Also check the deals for one-way flights from Istanbul 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 Istanbul to Bucharest in September from $123

Return flights