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

Return flights

16 Sep - 26 Oct	VietJet Air
19 Sep - 22 Sep	VietJet Air
17 Sep - 23 Sep	VietJet Air
16 Sep - 21 Sep	VietJet Air
19 Sep - 21 Sep	VietJet Air
17 Sep - 22 Sep	VietJet Air
14 Sep - 15 Sep	AirAsia X
16 Sep - 22 Sep	VietJet Air
15 Sep - 19 Sep	VietJet Air
20 Sep - 25 Sep	Scoot	direct
20 Sep - 23 Sep	Scoot	direct
16 Sep - 26 Oct	Scoot	direct
19 Sep - 04 Oct	VietJet Air
30 Sep - 07 Oct	Hainan Airlines
23 Sep - 09 Oct	VietJet Air
24 Sep - 09 Oct	VietJet Air
24 Sep - 08 Oct	VietJet Air
19 Sep - 03 Oct	VietJet Air
30 Sep - 21 Oct	AirAsia X
17 Sep - 01 Oct	VietJet Air

Also check the deals for one-way flights from Sydney to Singapore 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 Singapore in September from 334€

Return flights