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

Return flights

15 Dec - 18 Dec	United
11 Dec - 13 Dec	Southwest Airlines
12 Dec - 15 Dec	United
11 Dec - 14 Dec	Southwest Airlines
11 Dec - 15 Dec	Southwest Airlines
07 Dec - 10 Dec	United
08 Dec - 11 Dec	United
06 Dec - 11 Dec	Delta
09 Dec - 16 Dec	Delta
10 Dec - 15 Dec	Delta
18 Dec - 31 Jan	Southwest Airlines
18 Dec - 11 Jan	Southwest Airlines
18 Dec - 05 Jan	Southwest Airlines
30 Dec - 06 Jan	Southwest Airlines
22 Dec - 01 Jan	United
18 Dec - 06 Jan	Southwest Airlines
18 Dec - 01 Jan	Southwest Airlines
24 Dec - 01 Jan	Southwest Airlines
22 Dec - 05 Jan	United
20 Dec - 06 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 215€

Return flights