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

Return flights

07 Sep - 17 Sep	Finnair
16 Sep - 01 Oct	Finnair
16 Sep - 24 Sep	Finnair
15 Sep - 29 Sep	Finnair
11 Sep - 18 Sep	Finnair
17 Sep - 30 Sep	Lufthansa
17 Sep - 24 Sep	Finnair
11 Sep - 23 Sep	Finnair
15 Sep - 26 Sep	Finnair
24 Sep - 01 Oct	Finnair
04 Sep - 19 Sep	Finnair
04 Sep - 24 Sep	Finnair
23 Sep - 02 Oct	Finnair
08 Sep - 02 Oct	Finnair
22 Sep - 05 Oct	Finnair
23 Sep - 05 Oct	Finnair
22 Sep - 04 Oct	Finnair
23 Sep - 04 Oct	Finnair
18 Sep - 03 Oct	Finnair
27 Sep - 02 Oct	Finnair

Also check the deals for one-way flights from Hong Kong 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 Hong Kong to Keflavik in September from $774

Return flights