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

Return flights

05 Sep - 18 Sep	Lufthansa
17 Sep - 24 Sep	SWISS
03 Sep - 18 Sep	Hainan Airlines
10 Sep - 17 Sep	SWISS
14 Sep - 23 Sep	Air China
21 Sep - 30 Sep	Lufthansa
11 Sep - 17 Sep	Air China
09 Sep - 24 Sep	Finnair
22 Sep - 02 Oct	Finnair
11 Sep - 25 Sep	Air China
16 Sep - 25 Sep	Air China
20 Sep - 01 Oct	Finnair
23 Sep - 02 Oct	Finnair
17 Sep - 02 Oct	Lufthansa
19 Sep - 02 Oct	Finnair
25 Sep - 02 Oct	Finnair
22 Sep - 04 Oct	Finnair
30 Sep - 13 Oct	KLM
28 Sep - 05 Oct	Finnair
25 Sep - 04 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 $771

Return flights