Cheapest one-way flights from Austin to San Juan in December from $122

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

One-Way flights

06 Dec American Airlines
15 Dec Frontier Airlines
04 Dec Frontier Airlines
05 Dec Spirit Airlines
31 Dec Spirit Airlines
14 Dec Frontier Airlines
03 Dec Spirit Airlines
01 Dec Spirit Airlines
28 Dec Spirit Airlines
23 Dec Spirit Airlines

Also check the deals for return flights from Austin to San Juan in December.

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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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