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

Return flights

03 Sep - 17 Sep	VietJet Air
03 Sep - 24 Sep	VietJet Air
02 Sep - 24 Sep	VietJet Air
04 Sep - 19 Sep	Air China
13 Sep - 19 Sep	Air China
14 Sep - 25 Sep	AirAsia X
28 Sep - 23 Oct	Turkish Airlines
10 Sep - 08 Oct	VietJet Air
16 Sep - 07 Oct	Scoot
05 Sep - 12 Sep	VietJet Air
12 Sep - 04 Oct	VietJet Air
05 Sep - 17 Sep	Thai Airways
05 Sep - 18 Sep	Thai Airways
05 Sep - 19 Sep	Thai Airways
29 Sep - 22 Oct	Thai Airways
20 Sep - 17 Oct	Air China
05 Sep - 15 Oct	Turkish Airlines
28 Sep - 13 Oct	Turkish Airlines
27 Sep - 01 Oct	Singapore Airlines
05 Sep - 17 Oct	Thai Airways

Also check the deals for one-way flights from Sydney to Copenhagen 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 Copenhagen in September from $1083

Return flights