AirHint found the following cheapest return flights from San Francisco (SFO) to Buenos Aires (AEP) in December 2025 (see full year).

Return flights

10 Dec - 19 Dec	Hawaiian Airlines
13 Dec - 20 Dec	Frontier Airlines
25 Dec - 09 Jan	Frontier Airlines
12 Dec - 01 Jan	Frontier Airlines
10 Dec - 01 Jan	Frontier Airlines
09 Dec - 01 Jan	LATAM Airlines Group
24 Dec - 31 Dec	Aeromexico
12 Dec - 02 Jan	Frontier Airlines
12 Dec - 03 Jan	Frontier Airlines
19 Dec - 26 Dec	Frontier Airlines
25 Dec - 03 Jan	LATAM Airlines Group
17 Dec - 31 Dec	Frontier Airlines
18 Dec - 05 Jan	Frontier Airlines
19 Dec - 02 Jan	Frontier Airlines
26 Dec - 03 Jan	Delta

Also check the deals for one-way flights from San Francisco 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 San Francisco to Buenos Aires in December from 892€

Return flights