AirHint found the following cheapest one-way flights from Austin (AUS) to San Juan (SJU) in January 2026 (see full year).
One-Way flights
| 04 Jan | Spirit Airlines |
Also check the deals for return flights from Austin to San Juan in January.
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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