AirHint found the following cheapest return flights from Austin (AUS) to Buenos Aires (EZE) in December 2025 (see full year).

Return flights

14 Dec - 23 Dec	United
16 Dec - 23 Dec	Delta
17 Dec - 23 Dec	Spirit Airlines
23 Dec - 30 Dec	LATAM Airlines Group
22 Dec - 09 Jan	Frontier Airlines
15 Dec - 12 Jan	Delta
21 Dec - 09 Jan	Frontier Airlines
12 Dec - 03 Jan	Spirit Airlines
27 Dec - 03 Jan	Frontier Airlines
16 Dec - 04 Jan	Spirit Airlines
13 Dec - 03 Jan	Spirit Airlines
20 Dec - 04 Jan	Spirit Airlines
15 Dec - 02 Jan	Spirit Airlines
19 Dec - 03 Jan	Frontier Airlines

Also check the deals for one-way flights from Austin to Buenos Aires 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 Austin to Buenos Aires in December from 614€

Return flights