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

Return flights

06 Dec - 13 Dec	United
08 Dec - 11 Dec	United
05 Dec - 08 Dec	United
09 Dec - 13 Dec	United
06 Dec - 09 Dec	United
11 Dec - 16 Dec	United
05 Dec - 12 Dec	Delta
16 Dec - 22 Dec	United
17 Dec - 15 Jan	Delta
18 Dec - 20 Dec	United
18 Dec - 22 Dec	United
31 Dec - 10 Jan	United
31 Dec - 05 Jan	United
25 Dec - 12 Jan	Southwest Airlines
25 Dec - 04 Jan	jetBlue
24 Dec - 12 Jan	United
29 Dec - 01 Jan	United
22 Dec - 01 Jan	United
28 Dec - 01 Jan	United
20 Dec - 06 Jan	United

Also check the deals for one-way flights from Washington to San Jose 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 Jose in December from 202€

Return flights