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

Return flights

23 Sep - 18 Oct	Thai Airways
18 Sep - 27 Sep	Finnair
18 Sep - 25 Sep	Thai Airways
23 Sep - 30 Sep	Thai Airways
18 Sep - 30 Sep	Thai Airways
25 Sep - 13 Oct	Thai Airways
19 Sep - 28 Sep	Thai Airways
20 Sep - 27 Sep	Thai Airways
23 Sep - 10 Oct	Thai Airways
19 Sep - 02 Oct	Thai Airways
21 Sep - 06 Oct	Thai Airways
28 Sep - 09 Oct	Virgin Australia

Also check the deals for one-way flights from Sydney 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 Sydney to Oslo in September from $1540

Return flights