Cheapest return flights from St. Louis to San Juan in December from 418€

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

Return flights

18 Dec - 21 Dec Spirit Airlines
24 Dec - 29 Dec Frontier Airlines
25 Dec - 29 Dec Frontier Airlines
20 Dec - 31 Dec Southern Airways Express
30 Dec - 03 Jan Frontier Airlines
21 Dec - 02 Jan Frontier Airlines
27 Dec - 03 Jan Southwest Airlines

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

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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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