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

Return flights

15 Aug - 22 Aug	Frontier Airlines
21 Aug - 28 Aug	Frontier Airlines
11 Aug - 21 Aug	Southwest Airlines
27 Aug - 30 Aug	Southwest Airlines
19 Aug - 21 Aug	Spirit Airlines
03 Aug - 22 Aug	Spirit Airlines
19 Aug - 22 Aug	Spirit Airlines
15 Aug - 17 Aug	Frontier Airlines
03 Aug - 21 Aug	Spirit Airlines
19 Aug - 29 Aug	Spirit Airlines
19 Aug - 05 Sep	Spirit Airlines
27 Aug - 16 Sep	Spirit Airlines
27 Aug - 05 Sep	Spirit Airlines
27 Aug - 14 Sep	Spirit Airlines
21 Aug - 05 Sep	Spirit Airlines
15 Aug - 05 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 224€

Return flights