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

Return flights

16 Sep - 23 Sep	KLM
19 Sep - 23 Sep	Finnair
19 Sep - 24 Sep	Finnair
16 Sep - 27 Sep	Air China
17 Sep - 25 Sep	Air China
17 Sep - 23 Sep	Air China
16 Sep - 28 Sep	Air China
23 Sep - 30 Sep	Finnair
19 Sep - 30 Sep	Finnair
18 Sep - 01 Oct	Finnair
17 Sep - 02 Oct	Emirates
17 Sep - 22 Oct	Emirates
19 Sep - 26 Sep	Finnair
19 Sep - 02 Oct	Finnair
26 Sep - 02 Oct	Finnair
19 Sep - 03 Oct	Finnair
30 Sep - 03 Oct	Greater Bay Airlines
18 Sep - 02 Oct	Finnair
28 Sep - 01 Oct	China Eastern
30 Sep - 31 Oct	Greater Bay Airlines

Also check the deals for one-way flights from Hong Kong to Madrid 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 Madrid in September from 583€

Return flights