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

Return flights

04 Dec - 17 Dec	Copa
12 Dec - 19 Dec	Copa
12 Dec - 14 Dec	Copa
24 Dec - 31 Dec	Copa
09 Dec - 16 Dec	Copa
24 Dec - 18 Jan	Copa
14 Dec - 01 Jan	Copa
26 Dec - 30 Dec	Avianca
24 Dec - 05 Jan	Avianca
18 Dec - 01 Jan	Copa
22 Dec - 01 Jan	Copa
21 Dec - 01 Jan	Copa
20 Dec - 01 Jan	GOL Linhas Aéreas
17 Dec - 29 Dec	Copa
22 Dec - 02 Jan	LATAM Airlines Group
18 Dec - 02 Jan	LATAM Airlines Group
21 Dec - 04 Jan	GOL Linhas Aéreas

Also check the deals for one-way flights from Miami 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 Miami to Asuncion in December from $433

Return flights