Cheapest return flights from Austin to San Juan in January from $138

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

Return flights

08 Jan - 11 Jan Frontier Airlines
08 Jan - 18 Jan Frontier Airlines
09 Jan - 18 Jan Frontier Airlines
08 Jan - 13 Jan Frontier Airlines
21 Jan - 25 Jan Spirit Airlines
20 Jan - 25 Jan jetBlue
06 Jan - 15 Jan Frontier Airlines
19 Jan - 24 Jan Southwest Airlines
23 Jan - 27 Jan Delta
08 Jan - 21 Jan Spirit Airlines
24 Jan - 10 Feb Spirit Airlines
21 Jan - 10 Feb Spirit Airlines
30 Jan - 10 Feb Spirit Airlines
20 Jan - 10 Feb Spirit Airlines
24 Jan - 09 Feb Spirit Airlines
21 Jan - 09 Feb Spirit Airlines
30 Jan - 09 Feb Spirit Airlines
19 Jan - 09 Feb Spirit Airlines
20 Jan - 09 Feb Spirit Airlines
24 Jan - 08 Feb Spirit Airlines

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

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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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