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

Return flights

08 Dec - 12 Dec	Delta
09 Dec - 13 Dec	jetBlue	direct
03 Dec - 07 Dec	Southwest Airlines
08 Dec - 15 Dec	Southwest Airlines
11 Dec - 16 Dec	United
10 Dec - 14 Dec	Southwest Airlines
04 Dec - 08 Dec	Southwest Airlines
05 Dec - 07 Dec	Southwest Airlines
11 Dec - 14 Dec	United
17 Dec - 24 Dec	United
30 Dec - 02 Jan	United
29 Dec - 05 Jan	Southwest Airlines
25 Dec - 02 Jan	Southwest Airlines
18 Dec - 06 Jan	United
26 Dec - 02 Jan	Southwest Airlines
30 Dec - 03 Jan	Southwest Airlines
31 Dec - 04 Jan	Southwest Airlines
20 Dec - 03 Jan	jetBlue
26 Dec - 03 Jan	Southwest Airlines
28 Dec - 04 Jan	Delta

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 209€

Return flights