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

Return flights

09 Sep - 16 Sep	Norwegian
14 Sep - 21 Sep	Ryanair
08 Sep - 15 Sep	Norwegian
26 Sep - 04 Oct	Scandinavian Airlines
22 Sep - 25 Sep	Ethiopian Airlines
12 Sep - 22 Sep	Emirates
13 Sep - 22 Sep	Emirates
13 Sep - 21 Sep	Emirates

Also check the deals for one-way flights from Oslo to Seoul 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 Oslo to Seoul in September from 613€

Return flights