Cheapest return flights from St. Louis to San Juan in January from $153

AirHint found the following cheapest return flights from St. Louis (STL) to San Juan (SJU) in January 2026 (see full year).

Return flights

07 Jan - 11 Jan Frontier Airlines
30 Jan - 05 Feb Frontier Airlines
28 Jan - 03 Feb Frontier Airlines
17 Jan - 21 Jan Frontier Airlines
27 Jan - 02 Feb Frontier Airlines
05 Jan - 12 Jan Frontier Airlines
29 Jan - 11 Feb Frontier Airlines
07 Jan - 18 Jan Frontier Airlines
16 Jan - 18 Jan Frontier Airlines

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

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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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