AirHint found the following cheapest return flights from Indianapolis (IND) to San Juan (SJU) in August 2025 (see full year).

Return flights

21 Aug - 24 Aug	Frontier Airlines
30 Aug - 19 Sep	Spirit Airlines
30 Aug - 06 Sep	Southwest Airlines
30 Aug - 01 Sep	Frontier Airlines
28 Aug - 31 Aug	Allegiant Air
22 Aug - 25 Aug	Frontier Airlines
20 Aug - 25 Aug	United
20 Aug - 21 Aug	Spirit Airlines
30 Aug - 31 Aug	Spirit Airlines
22 Aug - 31 Aug	Spirit Airlines
20 Aug - 31 Aug	Spirit Airlines
21 Aug - 31 Aug	Spirit Airlines
20 Aug - 24 Aug	Spirit Airlines
28 Aug - 01 Sep	Spirit Airlines
22 Aug - 01 Sep	Spirit Airlines
20 Aug - 01 Sep	Spirit Airlines
21 Aug - 01 Sep	Spirit Airlines

Also check the deals for one-way flights from Indianapolis to San Juan in August.

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 Indianapolis to San Juan in August from $266

Return flights