Cheapest return flights from Washington to San Jose in December from $414

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

Return flights

26 Dec - 30 Dec Copa
27 Dec - 29 Dec Volaris El Salvador
29 Dec - 10 Jan Avianca
29 Dec - 07 Jan Avianca
31 Dec - 05 Jan Frontier Airlines
30 Dec - 05 Jan Frontier Airlines
27 Dec - 31 Dec Frontier Airlines
29 Dec - 10 Jan Avianca direct
28 Dec - 02 Jan GOL Linhas AΓ©reas
27 Dec - 29 Dec Avianca direct
30 Dec - 04 Jan Frontier Airlines
29 Dec - 04 Jan Avianca
28 Dec - 04 Jan Frontier Airlines
30 Dec - 05 Jan Avianca direct

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

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