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

Return flights

17 Sep - 25 Sep	LATAM Airlines Group
30 Sep - 29 Oct	GOL Linhas Aéreas
24 Sep - 26 Oct	Avianca
18 Sep - 25 Sep	LATAM Airlines Group
28 Sep - 20 Oct	Avianca
28 Sep - 22 Oct	Avianca
24 Sep - 22 Oct	Avianca
07 Sep - 14 Sep	LATAM Airlines Group
18 Sep - 13 Oct	GOL Linhas Aéreas
28 Sep - 10 Oct	Avianca
17 Sep - 15 Oct	LATAM Airlines Group
14 Sep - 22 Sep	LATAM Airlines Group
26 Sep - 20 Oct	Avianca
28 Sep - 14 Oct	Avianca
15 Sep - 22 Sep	LATAM Airlines Group
26 Sep - 30 Sep	Avianca
12 Sep - 19 Sep	Avianca
14 Sep - 19 Sep	GOL Linhas Aéreas
21 Sep - 28 Sep	Avianca
19 Sep - 26 Sep	LATAM Airlines Group

Also check the deals for one-way flights from Asuncion 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 Asuncion to Madrid in September from $981

Return flights