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

Return flights

20 Jan - 23 Jan	Delta
19 Jan - 23 Jan	Delta
20 Jan - 28 Jan	Delta
21 Jan - 28 Jan	Delta
24 Jan - 29 Jan	Delta
20 Jan - 24 Jan	Delta
24 Jan - 28 Jan	Delta
27 Jan - 31 Jan	United
29 Jan - 01 Feb	Southwest Airlines
29 Jan - 03 Feb	Southwest Airlines
14 Jan - 23 Jan	Southwest Airlines
23 Jan - 01 Feb	Southwest Airlines
21 Jan - 25 Jan	Southwest Airlines
30 Jan - 01 Feb	Southwest Airlines
29 Jan - 02 Feb	Southwest Airlines
31 Jan - 07 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 194€

Return flights