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

Return flights

17 Jan - 24 Jan	United
09 Jan - 15 Jan	Delta
09 Jan - 16 Jan	Delta
07 Jan - 15 Jan	United
20 Jan - 27 Jan	Delta
09 Jan - 17 Jan	Delta
08 Jan - 16 Jan	Southwest Airlines
08 Jan - 23 Jan	Southwest Airlines
15 Jan - 16 Jan	Southwest Airlines
15 Jan - 23 Jan	Southwest Airlines
24 Jan - 01 Feb	United

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

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Washington to San Juan in January from 242€

Return flights