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

Return flights

05 Sep - 19 Sep	Etihad Airways
08 Sep - 16 Sep	Etihad Airways
02 Sep - 14 Sep	Etihad Airways
16 Sep - 23 Sep	Etihad Airways
18 Sep - 29 Sep	Malaysia Airlines
30 Sep - 06 Oct	Etihad Airways
29 Sep - 01 Oct	Etihad Airways

Also check the deals for one-way flights from Sydney to Keflavik 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 Keflavik in September from $1668

Return flights