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

Return flights

16 Sep - 23 Sep	China Eastern
02 Sep - 09 Sep	AirAsia X
03 Sep - 10 Sep	VietJet Air
16 Sep - 03 Oct	British Airways
16 Sep - 26 Sep	British Airways
09 Sep - 23 Sep	Singapore Airlines
05 Sep - 12 Sep	Qatar 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 $1300

Return flights