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Cheapest one-way flights from Washington (IAD) to San Jose (SJO), December

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Dates, airline, and price
Dates	Airline	Price
01 Dec	United
06 Dec	Copa
07 Dec	Copa
08 Dec	Copa
09 Dec	Copa
10 Dec	Copa
11 Dec	Copa
12 Dec	Copa
15 Dec	United

deals for return flights from Washington to San Jose in December.

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Updated Jul 15, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

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Cheapest one-way flights from Washington (IAD) to San Jose (SJO), December

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