Cheapest return flights from Washington to San Juan in January from 176€

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

Return flights

14 Jan - 23 Jan Frontier Airlines
11 Jan - 15 Jan Frontier Airlines
01 Jan - 08 Jan Frontier Airlines
04 Jan - 08 Jan Frontier Airlines
14 Jan - 20 Jan Delta
10 Jan - 17 Jan Frontier Airlines
23 Jan - 01 Feb Frontier Airlines
08 Jan - 12 Jan Frontier Airlines
23 Jan - 27 Jan United direct
08 Jan - 11 Jan Frontier Airlines
19 Jan - 24 Jan United direct
29 Jan - 03 Feb United
29 Jan - 02 Feb United
23 Jan - 01 Feb United direct
29 Jan - 01 Feb United

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

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