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
06 Dec - 10 Dec	Southwest Airlines
06 Dec - 20 Dec	Southwest Airlines
02 Dec - 06 Dec	United
03 Dec - 09 Dec	United
04 Dec - 06 Dec	Southwest Airlines
13 Dec - 20 Dec	Southwest Airlines
05 Dec - 10 Dec	Southwest Airlines
31 Dec - 09 Jan	United
17 Dec - 23 Dec	United
18 Dec - 21 Dec	Southwest Airlines
24 Dec - 09 Jan	United
28 Dec - 09 Jan	Delta
24 Dec - 01 Jan	Southwest Airlines
31 Dec - 04 Jan	Southwest Airlines
28 Dec - 04 Jan	Southwest Airlines
24 Dec - 04 Jan	Southwest Airlines
26 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 184€

Return flights