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

Return flights

17 Sep - 24 Sep	China Eastern
17 Sep - 22 Sep	VietJet Air
24 Sep - 29 Oct	Turkish Airlines
16 Sep - 23 Sep	Turkish Airlines
16 Sep - 21 Oct	Turkish Airlines
17 Sep - 21 Oct	Thai Airways
18 Sep - 25 Sep	Scoot
16 Sep - 27 Sep	Singapore Airlines
17 Sep - 22 Oct	Thai Airways
28 Sep - 13 Oct	Turkish Airlines
28 Sep - 14 Oct	Turkish Airlines
20 Sep - 28 Sep	Thai Airways
19 Sep - 30 Sep	Thai Airways
29 Sep - 17 Oct	Emirates
21 Sep - 08 Oct	Thai Airways
23 Sep - 12 Oct	Thai Airways
18 Sep - 03 Oct	Finnair
19 Sep - 25 Sep	Qantas

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.

Book a cheap hotel in Copenhagen

Cheap car rent in Copenhagen

Cheapest return flights from Sydney to Copenhagen in September from 778€

Return flights