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

Return flights

25 Sep - 30 Sep	Air Canada
24 Sep - 02 Oct	Delta
29 Sep - 07 Oct	Iberia
30 Sep - 07 Oct	Iberia
28 Sep - 07 Oct	Iberia
27 Sep - 07 Oct	Finnair
23 Sep - 26 Sep	Finnair
22 Sep - 24 Sep	Finnair
24 Sep - 07 Oct	Finnair
27 Sep - 04 Oct	Iberia
30 Sep - 08 Oct	Finnair
27 Sep - 08 Oct	Finnair
25 Sep - 07 Oct	Iberia
24 Sep - 25 Sep	Delta
26 Sep - 30 Sep	Air Canada
24 Sep - 30 Sep	Air Canada
22 Sep - 25 Sep	Iberia
23 Sep - 30 Sep	Iberia
20 Sep - 24 Sep	Iberia
21 Sep - 23 Sep	Iberia

Also check the deals for one-way flights from Mexico City 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 Mexico City to Madrid in September from $729

Return flights