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

Return flights

04 Sep - 19 Sep	Air China
04 Sep - 18 Sep	Air China
09 Sep - 24 Oct	Air China
07 Sep - 15 Sep	Air India
21 Sep - 28 Sep	Air India
30 Sep - 29 Oct	Turkish Airlines
20 Sep - 11 Oct	Air India
13 Sep - 25 Sep	Thai Airways
20 Sep - 27 Sep	Thai Airways
10 Sep - 08 Oct	Thai Airways
28 Sep - 03 Oct	Thai Airways
09 Sep - 04 Oct	Air China
29 Sep - 17 Oct	Virgin Australia
19 Sep - 11 Oct	Thai Airways
28 Sep - 11 Oct	Thai Airways
12 Sep - 04 Oct	Emirates
21 Sep - 30 Sep	British 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 769€

Return flights