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

Return flights

14 Jan - 23 Jan	Delta
18 Jan - 23 Jan	Delta
25 Jan - 27 Jan	Southwest Airlines
11 Jan - 15 Jan	United
24 Jan - 29 Jan	Southwest Airlines
14 Jan - 20 Jan	Southwest Airlines
23 Jan - 27 Jan	Southwest Airlines
29 Jan - 03 Feb	Southwest Airlines
23 Jan - 01 Feb	Southwest Airlines
29 Jan - 01 Feb	Southwest Airlines
29 Jan - 02 Feb	Southwest Airlines
11 Jan - 17 Jan	United
09 Jan - 14 Jan	United
20 Jan - 25 Jan	Southwest Airlines

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 339CAD

Return flights