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

Return flights

09 Sep - 23 Sep	Air China
10 Sep - 23 Sep	Air China
09 Sep - 17 Sep	Air China
07 Sep - 19 Sep	Air China
24 Sep - 11 Oct	Air China
04 Sep - 15 Sep	Air China
04 Sep - 16 Sep	Air China
03 Sep - 17 Sep	Air China
03 Sep - 15 Sep	Air China
12 Sep - 19 Sep	Air China
09 Sep - 16 Sep	Air China
21 Sep - 12 Oct	Air China
23 Sep - 12 Oct	Air China
10 Sep - 27 Oct	Air China
20 Sep - 12 Oct	Air China
23 Sep - 11 Oct	Air China
24 Sep - 04 Oct	Air China
19 Sep - 14 Oct	Air China
16 Sep - 16 Oct	Air China
20 Sep - 04 Oct	Air China

Also check the deals for one-way flights from Madrid to Hanoi 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 Madrid to Hanoi in September from $631

Return flights