Cheapest return flights from Denver to San Juan in January from 237€

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

Return flights

17 Jan - 22 Jan Frontier Airlines
06 Jan - 10 Jan Frontier Airlines
28 Jan - 07 Feb Frontier Airlines
01 Jan - 31 Jan Frontier Airlines
01 Jan - 08 Jan Frontier Airlines
14 Jan - 19 Jan Frontier Airlines
15 Jan - 19 Jan Frontier Airlines
11 Jan - 18 Jan jetBlue
14 Jan - 21 Jan Delta
12 Jan - 19 Jan American Airlines
02 Jan - 06 Jan Frontier Airlines

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

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