Cheapest return flights from Austin to San Juan in September from 192€

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

Return flights

06 Sep - 12 Sep Southwest Airlines
22 Sep - 25 Sep Southwest Airlines
19 Sep - 23 Sep Southwest Airlines
14 Sep - 20 Sep Southwest Airlines
06 Sep - 11 Sep Southwest Airlines
13 Sep - 23 Sep Spirit Airlines
12 Sep - 23 Sep Spirit Airlines
18 Sep - 23 Sep Southwest Airlines
24 Sep - 28 Sep Southwest Airlines
13 Sep - 22 Sep Spirit 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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