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

Return flights

10 Dec - 17 Dec	United
11 Dec - 23 Dec	United
09 Dec - 13 Dec	United
05 Dec - 09 Dec	United
06 Dec - 09 Dec	United
15 Dec - 22 Dec	United
04 Dec - 08 Dec	United
11 Dec - 16 Dec	United
13 Dec - 15 Dec	United
11 Dec - 15 Dec	United
30 Dec - 07 Jan	Frontier Airlines
22 Dec - 06 Jan	jetBlue
30 Dec - 06 Jan	Frontier Airlines
24 Dec - 12 Jan	Southwest Airlines
23 Dec - 06 Jan	United
27 Dec - 01 Jan	United
30 Dec - 03 Jan	Southwest Airlines
25 Dec - 01 Jan	United
20 Dec - 02 Jan	United
25 Dec - 04 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 257€

Return flights