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

Return flights

04 Dec - 08 Dec	LATAM Airlines Group
30 Dec - 29 Jan	LATAM Airlines Group
31 Dec - 29 Jan	LATAM Airlines Group
07 Dec - 14 Dec	LATAM Airlines Group
01 Dec - 14 Dec	LATAM Airlines Group
27 Dec - 27 Jan	LATAM Airlines Group
05 Dec - 16 Dec	Avianca
01 Dec - 01 Jan	Avianca
24 Dec - 24 Jan	Avianca
24 Dec - 31 Jan	Avianca
29 Dec - 29 Jan	Avianca
02 Dec - 18 Dec	LATAM Airlines Group
07 Dec - 15 Jan	LATAM Airlines Group
28 Dec - 28 Jan	LATAM Airlines Group
26 Dec - 26 Jan	Avianca
02 Dec - 28 Dec	LATAM Airlines Group
05 Dec - 14 Dec	Avianca
01 Dec - 31 Dec	LATAM Airlines Group
02 Dec - 26 Dec	LATAM Airlines Group
02 Dec - 22 Dec	Air Europa

Also check the deals for one-way flights from Madrid to Asuncion in December.

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 Asuncion in December from 799€

Return flights