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

Return flights

11 Dec - 22 Dec	jetBlue
15 Dec - 22 Dec	jetBlue
12 Dec - 19 Dec	American Airlines
12 Dec - 16 Dec	American Airlines
11 Dec - 15 Dec	American Airlines
13 Dec - 15 Dec	American Airlines
12 Dec - 15 Dec	American Airlines
13 Dec - 20 Dec	American Airlines
14 Dec - 18 Dec	American Airlines
14 Dec - 21 Dec	jetBlue
24 Dec - 14 Jan	jetBlue
15 Dec - 01 Jan	jetBlue
15 Dec - 02 Jan	jetBlue
31 Dec - 02 Jan	jetBlue
18 Dec - 01 Jan	jetBlue
29 Dec - 01 Jan	jetBlue
18 Dec - 05 Jan	jetBlue
18 Dec - 06 Jan	jetBlue
15 Dec - 18 Jan	jetBlue
30 Dec - 01 Jan	jetBlue

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 $301

Return flights