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

Return flights

02 Sep - 09 Sep	KLM
02 Sep - 11 Sep	KLM
15 Sep - 23 Sep	Delta
03 Sep - 09 Sep	Delta
03 Sep - 10 Sep	Delta
02 Sep - 13 Sep	Delta
03 Sep - 13 Sep	Delta
23 Sep - 30 Sep	Delta
10 Sep - 26 Sep	Delta
28 Sep - 11 Oct	Air France
22 Sep - 10 Oct	Delta
04 Sep - 11 Sep	KLM
25 Sep - 23 Oct	Air France
27 Sep - 07 Oct	Air France
17 Sep - 13 Oct	Delta

Also check the deals for one-way flights from Dallas 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 Dallas to Madrid in September from 459€

Return flights