Cheapest return flights from Denver to San Juan in January from $178

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

Return flights

07 Jan - 12 Jan Frontier Airlines
08 Jan - 12 Jan Frontier Airlines
07 Jan - 14 Jan Frontier Airlines
07 Jan - 13 Jan Frontier Airlines
28 Jan - 07 Feb Frontier Airlines
22 Jan - 26 Jan Frontier Airlines
10 Jan - 17 Jan Frontier Airlines
15 Jan - 22 Jan Frontier Airlines
25 Jan - 03 Feb Frontier Airlines
09 Jan - 13 Jan Frontier Airlines
14 Jan - 21 Jan Frontier Airlines
14 Jan - 18 Jan Frontier Airlines

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

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