Cheapest return flights from Washington to San Juan in January from $88

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

Return flights

12 Jan - 16 Jan Frontier Airlines direct
11 Jan - 16 Jan Frontier Airlines direct
11 Jan - 17 Jan Frontier Airlines direct
10 Jan - 16 Jan Frontier Airlines direct
08 Jan - 16 Jan Frontier Airlines direct
12 Jan - 17 Jan Frontier Airlines direct
09 Jan - 16 Jan Frontier Airlines direct
09 Jan - 17 Jan Frontier Airlines direct
08 Jan - 12 Jan Frontier Airlines direct
10 Jan - 12 Jan Frontier Airlines direct
30 Jan - 02 Feb Frontier Airlines
29 Jan - 02 Feb Frontier Airlines
30 Jan - 03 Feb United direct
30 Jan - 01 Feb Frontier Airlines
23 Jan - 01 Feb Frontier Airlines
29 Jan - 03 Feb United direct
31 Jan - 03 Feb United direct
29 Jan - 01 Feb Frontier Airlines
30 Jan - 02 Feb United direct
31 Jan - 07 Feb Delta

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

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