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

Select a price to book. see full year.

Dates, airline, and price
Dates	Airline	Price
16 Sep	United
17 Sep	United
20 Sep	United
21 Sep	United
28 Sep	United
29 Sep	United
05 Sep	United
06 Sep	United
08 Sep	United
09 Sep	United

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

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Updated Jul 14, 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), September

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