Cheapest return flights from Austin to San Juan in December from $230

AirHint found the following cheapest return flights from Austin (AUS) to San Juan (SJU) in December 2025 (see full year).

Return flights

13 Dec - 20 Dec Spirit Airlines
04 Dec - 08 Dec Frontier Airlines
11 Dec - 16 Dec Frontier Airlines
12 Dec - 21 Dec Frontier Airlines
14 Dec - 21 Dec jetBlue
14 Dec - 19 Dec Spirit Airlines
05 Dec - 10 Dec Spirit Airlines
31 Dec - 13 Jan Spirit Airlines
04 Dec - 10 Dec Frontier Airlines
31 Dec - 12 Jan Spirit Airlines
31 Dec - 09 Jan Spirit Airlines
30 Dec - 09 Jan Frontier Airlines
12 Dec - 15 Dec Spirit Airlines
12 Dec - 19 Dec Spirit Airlines
30 Dec - 13 Jan Spirit Airlines
30 Dec - 12 Jan Spirit Airlines
31 Dec - 11 Jan Spirit Airlines
30 Dec - 06 Jan Frontier Airlines
31 Dec - 15 Jan Spirit Airlines
30 Dec - 11 Jan Spirit Airlines

Also check the deals for one-way flights from Austin to San Juan in December.

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