Cheapest return flights from Denver to San Juan in January from 154€

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

Return flights

05 Jan - 12 Jan Frontier Airlines
07 Jan - 12 Jan Frontier Airlines
28 Jan - 07 Feb Frontier Airlines
14 Jan - 21 Jan Frontier Airlines
23 Jan - 26 Jan Frontier Airlines
14 Jan - 18 Jan Frontier Airlines
16 Jan - 20 Jan Frontier Airlines
04 Jan - 11 Jan Frontier Airlines
15 Jan - 18 Jan Frontier Airlines
03 Jan - 09 Jan Frontier Airlines
19 Jan - 23 Jan United

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

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