Cheapest return flights from Denver to San Juan in January from $138

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

Return flights

24 Jan - 28 Jan Frontier Airlines
08 Jan - 12 Jan Frontier Airlines
09 Jan - 13 Jan Frontier Airlines
23 Jan - 30 Jan Frontier Airlines
13 Jan - 27 Jan Frontier Airlines
15 Jan - 28 Jan Frontier Airlines
29 Jan - 02 Feb Frontier Airlines
30 Jan - 02 Feb Frontier Airlines
15 Jan - 22 Jan Frontier Airlines
30 Jan - 01 Feb Frontier Airlines
09 Jan - 18 Jan Frontier Airlines
29 Jan - 01 Feb Frontier Airlines
18 Jan - 25 Jan Frontier Airlines
22 Jan - 08 Feb Frontier Airlines
06 Jan - 11 Jan Frontier Airlines
28 Jan - 07 Feb Frontier Airlines

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

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