Cheapest return flights from Washington to San Jose in December from $265

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

Return flights

02 Dec - 06 Dec Avianca direct
15 Dec - 23 Dec Avianca direct
03 Dec - 07 Dec Copa
10 Dec - 14 Dec Volaris El Salvador
17 Dec - 22 Dec Copa
20 Dec - 30 Dec Frontier Airlines
18 Dec - 23 Dec Avianca direct
22 Dec - 26 Dec Avianca
20 Dec - 28 Dec Frontier Airlines
12 Dec - 15 Dec Avianca

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

Skyscanner

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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