AirHint found the following cheapest return flights from Washington (DCA) to San Juan (SJU) in December 2025 (see full year).

Return flights

07 Dec - 14 Dec	United
31 Dec - 16 Jan	Delta
04 Dec - 07 Dec	United
05 Dec - 07 Dec	United
31 Dec - 07 Jan	Delta
11 Dec - 15 Dec	Southwest Airlines
31 Dec - 09 Jan	Delta
11 Dec - 20 Dec	United
18 Dec - 22 Dec	jetBlue
31 Dec - 03 Jan	Southwest Airlines
24 Dec - 09 Jan	United
30 Dec - 04 Jan	Southwest Airlines
25 Dec - 03 Jan	Southwest Airlines
27 Dec - 03 Jan	Southwest Airlines
24 Dec - 10 Jan	United
19 Dec - 31 Dec	Southwest Airlines
25 Dec - 09 Jan	United

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

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 December from 242€

Return flights