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

Return flights

01 Dec - 04 Dec	American Airlines
03 Dec - 11 Dec	jetBlue
09 Dec - 13 Dec	Delta
04 Dec - 10 Dec	jetBlue
04 Dec - 12 Dec	jetBlue
11 Dec - 14 Dec	jetBlue	direct
10 Dec - 19 Dec	United
11 Dec - 16 Dec	United
11 Dec - 20 Dec	United
14 Dec - 18 Dec	Southwest Airlines
12 Dec - 10 Jan	jetBlue
13 Dec - 09 Jan	jetBlue
13 Dec - 10 Jan	jetBlue
29 Dec - 08 Jan	United
18 Dec - 11 Jan	Southwest Airlines
29 Dec - 06 Jan	United
18 Dec - 06 Jan	United
24 Dec - 01 Jan	Southwest Airlines
18 Dec - 05 Jan	United
28 Dec - 02 Jan	Southwest Airlines

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 230€

Return flights