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

Return flights

15 Sep - 28 Sep	Delta
15 Sep - 27 Sep	Delta
16 Sep - 28 Sep	Delta
16 Sep - 15 Oct	Delta
15 Sep - 23 Sep	Delta
15 Sep - 25 Sep	Delta
16 Sep - 23 Sep	Delta
16 Sep - 22 Sep	Delta
15 Sep - 21 Sep	Delta
16 Sep - 25 Sep	Delta
15 Sep - 07 Oct	Delta
15 Sep - 16 Oct	Delta
15 Sep - 23 Oct	Delta
16 Sep - 30 Sep	Delta
16 Sep - 06 Oct	Delta
26 Sep - 06 Oct	American Airlines
23 Sep - 27 Oct	Delta
23 Sep - 16 Oct	Delta
23 Sep - 07 Oct	Delta
16 Sep - 01 Oct	Delta

Also check the deals for one-way flights from Madrid to Buenos Aires 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 Buenos Aires in September from 743€

Return flights