Cheapest return flights from Austin to San Juan in September from 194€

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

Return flights

22 Sep - 25 Sep Southwest Airlines
19 Sep - 22 Sep Southwest Airlines
22 Sep - 26 Sep Delta
06 Sep - 11 Sep Southwest Airlines
29 Sep - 11 Oct United
05 Sep - 07 Sep Frontier Airlines
02 Sep - 06 Sep United
06 Sep - 09 Sep Southwest Airlines
06 Sep - 08 Sep Southwest Airlines
10 Sep - 16 Sep Southwest Airlines

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

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.

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