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

Return flights

10 Sep - 28 Sep	IndiGo
09 Sep - 23 Sep	IndiGo
04 Sep - 18 Sep	IndiGo
01 Sep - 08 Sep	Finnair
24 Sep - 10 Oct	KLM
05 Sep - 10 Sep	Turkish Airlines
09 Sep - 19 Sep	Lufthansa
06 Sep - 13 Sep	Finnair
05 Sep - 13 Sep	Finnair
19 Sep - 04 Oct	IndiGo
17 Sep - 04 Oct	IndiGo
01 Sep - 07 Sep	Lufthansa
22 Sep - 26 Sep	Scandinavian Airlines

Also check the deals for one-way flights from Oslo to Singapore 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 Singapore in September from 525€

Return flights