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

One-Way flights

29 Sep	Wizz Air
26 Sep	Wizz Air
10 Sep	Pegasus Airlines	direct
06 Sep	Pegasus Airlines	direct
21 Sep	Pegasus Airlines	direct
08 Sep	Pegasus Airlines	direct
20 Sep	Pegasus Airlines	direct
01 Sep	Pegasus Airlines	direct
12 Sep	Pegasus Airlines	direct
13 Sep	Pegasus Airlines	direct

Also check the deals for return flights from Oslo 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 Oslo to Istanbul in September from $76

One-Way flights