AirHint found the following cheapest return flights from Austin (AUS) to San Juan (SJU) in January 2026 (see full year).

Return flights

20 Jan - 24 Jan	United
20 Jan - 23 Jan	American Airlines
30 Jan - 03 Feb	American Airlines
14 Jan - 19 Jan	Delta
17 Jan - 20 Jan	Delta
17 Jan - 19 Jan	Delta
15 Jan - 19 Jan	Delta
16 Jan - 19 Jan	Delta
16 Jan - 20 Jan	Delta
16 Jan - 21 Jan	jetBlue
14 Jan - 23 Jan	Spirit Airlines

Also check the deals for one-way 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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Cheapest return flights from Austin to San Juan in January from $245

Return flights