Cheapest one-way flights from Austin to San Juan in December from 89€

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

One-Way flights

01 Dec jetBlue
15 Dec Frontier Airlines
31 Dec Spirit Airlines
13 Dec Spirit Airlines
14 Dec Spirit Airlines
30 Dec Spirit Airlines
29 Dec Spirit Airlines
22 Dec Frontier Airlines
25 Dec Spirit Airlines
13 Dec Southwest Airlines direct

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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