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

Return flights

01 Dec - 08 Dec	Spirit Airlines
04 Dec - 23 Dec	Spirit Airlines
11 Dec - 23 Dec	Spirit Airlines
11 Dec - 25 Dec	Spirit Airlines
12 Dec - 23 Dec	Spirit Airlines
12 Dec - 25 Dec	Spirit Airlines
25 Dec - 13 Jan	Spirit Airlines
12 Dec - 01 Jan	Spirit Airlines
23 Dec - 25 Dec	Spirit Airlines
23 Dec - 01 Jan	Spirit Airlines
25 Dec - 01 Jan	Spirit Airlines
23 Dec - 02 Jan	Spirit Airlines

Also check the deals for one-way flights from Philadelphia to Santiago 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 Philadelphia to Santiago in December from $489

Return flights