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

Return flights

18 Sep - 23 Sep	Pegasus Airlines
23 Sep - 26 Sep	Pegasus Airlines
09 Sep - 15 Sep	Pegasus Airlines
23 Sep - 30 Sep	AJet
09 Sep - 14 Sep	Pegasus Airlines
13 Sep - 16 Sep	Pegasus Airlines
10 Sep - 14 Sep	Pegasus Airlines
15 Sep - 22 Sep	Pegasus Airlines
11 Sep - 19 Sep	Pegasus Airlines	direct
08 Sep - 11 Sep	Pegasus Airlines
30 Sep - 10 Oct	AJet
23 Sep - 03 Oct	Pegasus Airlines	direct
30 Sep - 10 Oct	Pegasus Airlines	direct

Also check the deals for one-way flights from Istanbul to Oslo 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 Oslo in September from 134€

Return flights