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

Return flights

19 Dec - 09 Jan	Frontier Airlines
23 Dec - 29 Dec	Southwest Airlines
23 Dec - 01 Jan	Southwest Airlines
22 Dec - 03 Jan	Frontier Airlines
23 Dec - 09 Jan	Spirit Airlines
22 Dec - 09 Jan	Spirit Airlines
19 Dec - 27 Dec	Southwest Airlines
20 Dec - 09 Jan	Spirit Airlines
22 Dec - 01 Jan	Spirit Airlines
20 Dec - 29 Dec	Spirit Airlines
23 Dec - 03 Jan	Spirit Airlines
20 Dec - 01 Jan	Spirit Airlines
20 Dec - 03 Jan	Spirit Airlines

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

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 December from 498€

Return flights