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

Return flights

08 Aug - 11 Aug	Frontier Airlines	direct
01 Aug - 11 Aug	Frontier Airlines	direct
27 Aug - 02 Sep	jetBlue	direct
03 Aug - 11 Aug	Spirit Airlines
01 Aug - 03 Aug	jetBlue	direct
30 Aug - 05 Sep	jetBlue	direct
02 Aug - 04 Aug	jetBlue	direct
08 Aug - 25 Aug	Spirit Airlines
02 Aug - 03 Aug	jetBlue	direct

Also check the deals for one-way flights from San Juan to Santiago 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 San Juan to Santiago in August from $160

Return flights