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

Return flights

23 Sep - 30 Sep	Spirit Airlines
09 Sep - 23 Sep	Spirit Airlines
24 Sep - 28 Sep	Spirit Airlines
13 Sep - 21 Sep	Spirit Airlines
10 Sep - 23 Sep	Spirit Airlines
10 Sep - 19 Sep	Spirit Airlines
12 Sep - 26 Sep	Spirit Airlines
20 Sep - 27 Sep	Spirit Airlines
06 Sep - 14 Sep	jetBlue
13 Sep - 04 Oct	Spirit Airlines
02 Sep - 13 Sep	jetBlue
12 Sep - 04 Oct	jetBlue
13 Sep - 04 Oct	Air France	direct

Also check the deals for one-way flights from Atlanta 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 Atlanta to Madrid in September from $479

Return flights