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

Return flights

13 Sep - 30 Oct	Air China
04 Sep - 19 Sep	Air India
02 Sep - 27 Sep	Air India
02 Sep - 16 Sep	Air China
16 Sep - 22 Sep	Air India
26 Sep - 12 Oct	Air India
06 Sep - 26 Sep	Air India
19 Sep - 04 Oct	Air India
22 Sep - 30 Sep	Scoot Tigerair
03 Sep - 20 Sep	Turkish Airlines
27 Sep - 10 Oct	Air China
18 Sep - 01 Oct	Air China
10 Sep - 08 Oct	British Airways
25 Sep - 02 Oct	Air China
10 Sep - 16 Sep	Air Canada
04 Sep - 20 Sep	Air China
25 Sep - 16 Oct	British Airways
22 Sep - 17 Oct	Finnair
15 Sep - 21 Sep	Air Canada

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 $907

Return flights