Cheapest return flights from Washington to San Jose in December from $228

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

Return flights

06 Dec - 16 Dec Frontier Airlines
04 Dec - 08 Dec Avianca direct
01 Dec - 09 Dec Avianca direct
04 Dec - 09 Dec Avianca direct
09 Dec - 13 Dec Avianca direct
02 Dec - 06 Dec Avianca direct
06 Dec - 16 Dec Avianca direct
06 Dec - 09 Dec United
08 Dec - 13 Dec Avianca direct
06 Dec - 09 Dec Avianca direct
25 Dec - 12 Jan Volaris El Salvador
28 Dec - 01 Jan Volaris El Salvador
26 Dec - 01 Jan Frontier Airlines
23 Dec - 06 Jan Avianca direct
28 Dec - 03 Jan Volaris El Salvador
24 Dec - 12 Jan Volaris El Salvador
30 Dec - 03 Jan Volaris El Salvador
25 Dec - 01 Jan Volaris El Salvador
27 Dec - 01 Jan Copa
27 Dec - 03 Jan Volaris El Salvador

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

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