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

Return flights

13 May - 16 May	Spirit Airlines
02 May - 16 May	Spirit Airlines
02 May - 09 May	Spirit Airlines
13 May - 14 May	Spirit Airlines
02 May - 14 May	Spirit Airlines
13 May - 15 May	Spirit Airlines
07 May - 11 May	Spirit Airlines
02 May - 15 May	Spirit Airlines
08 May - 16 May	Spirit Airlines
08 May - 09 May	Spirit Airlines
28 May - 15 Jun	Spirit Airlines
22 May - 15 Jun	United

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

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 May from 148€

Return flights