AirHint found the following cheapest return flights from Austin (AUS) to San Juan (SJU) in May 2026 (see full year).
Return flights
| 19 May - 28 May | Delta | ||
| 08 May - 16 May | Delta | ||
| 09 May - 16 May | United | ||
| 12 May - 19 May | Delta | ||
| 11 May - 17 May | Delta | ||
| 09 May - 16 May | Southwest Airlines | direct |
Also check the deals for one-way flights from Austin to San Juan in May.
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