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

Return flights

09 Dec - 17 Dec	Frontier Airlines
05 Dec - 13 Dec	Frontier Airlines
02 Dec - 08 Dec	Frontier Airlines
09 Dec - 22 Dec	Frontier Airlines
08 Dec - 22 Dec	Frontier Airlines
07 Dec - 21 Dec	Frontier Airlines
13 Dec - 23 Dec	Frontier Airlines
02 Dec - 09 Dec	Aeromexico
15 Dec - 22 Dec	LATAM Airlines Group
23 Dec - 15 Jan	Frontier Airlines
16 Dec - 23 Dec	Frontier Airlines
23 Dec - 10 Jan	Frontier Airlines
07 Dec - 07 Jan	Frontier Airlines
23 Dec - 01 Jan	Frontier Airlines
10 Dec - 01 Jan	Frontier Airlines
10 Dec - 03 Jan	Frontier Airlines
19 Dec - 03 Jan	Avianca
13 Dec - 03 Jan	Frontier Airlines
20 Dec - 04 Jan	Frontier Airlines
19 Dec - 04 Jan	Aeromexico

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 $868

Return flights