Cheapest return flights from Austin to San Juan in December from $638

Best time to book flights for Austin (AUS) to San Juan (SJU) flights at AirHint

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

Return flights

25 Dec - 31 Dec American Airlines
19 Dec - 19 Dec American Airlines
26 Dec - 03 Jan American Airlines
19 Dec - 03 Jan American Airlines

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

Skyscanner

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.

Book a cheap hotel in San Juan

Cheap car rent in San Juan