AirHint found the following cheapest return flights from Philadelphia (PHL) to Santiago (STI) in July 2025 (see full year).

Return flights

31 Jul - 25 Aug	Spirit Airlines
17 Jul - 23 Jul	Frontier Airlines
18 Jul - 23 Jul	Frontier Airlines
28 Jul - 10 Aug	Spirit Airlines
19 Jul - 27 Jul	Spirit Airlines
19 Jul - 22 Jul	Spirit Airlines
18 Jul - 27 Jul	Frontier Airlines
26 Jul - 10 Aug	Spirit Airlines
17 Jul - 22 Jul	Frontier Airlines
04 Jul - 07 Jul	Frontier Airlines
14 Jul - 24 Jul	American Airlines

Also check the deals for one-way flights from Philadelphia to Santiago in July.

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 Philadelphia to Santiago in July from $375

Return flights