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

Return flights

25 Aug - 09 Sep	Finnair
20 Aug - 24 Aug	Norwegian
25 Aug - 29 Aug	Turkish Airlines
10 Aug - 25 Aug	Qatar Airways
19 Aug - 21 Aug	IndiGo
03 Aug - 20 Aug	Norwegian
02 Aug - 18 Aug	Qatar Airways
01 Aug - 18 Aug	Qatar Airways
02 Aug - 10 Aug	Qatar Airways
13 Aug - 03 Sep	Turkish Airlines
01 Aug - 04 Aug	IndiGo

Also check the deals for one-way flights from Oslo to Singapore in August.

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 August from 543€

Return flights