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

Return flights

16 Sep - 27 Sep	Air China
19 Sep - 24 Sep	Air China
16 Sep - 24 Sep	Air China
19 Sep - 26 Sep	Air China
16 Sep - 21 Sep	Air China
16 Sep - 26 Sep	Air China
19 Sep - 25 Sep	Air China
16 Sep - 20 Sep	Air China
16 Sep - 19 Sep	Air China
18 Sep - 25 Sep	Air China
25 Sep - 02 Oct	China Eastern
26 Sep - 02 Oct	Finnair
26 Sep - 03 Oct	Finnair
14 Sep - 01 Oct	Emirates
24 Sep - 01 Oct	China Eastern
20 Sep - 04 Oct	China Eastern
27 Sep - 02 Oct	Finnair
22 Sep - 05 Oct	China Eastern
24 Sep - 05 Oct	China Eastern
23 Sep - 05 Oct	China Eastern

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 $451

Return flights