Cheapest return flights from Washington to San Jose in September from $255

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

Return flights

11 Sep - 16 Sep United
24 Sep - 29 Sep United
01 Sep - 06 Sep American Airlines
11 Sep - 20 Sep American Airlines
05 Sep - 08 Sep jetBlue
16 Sep - 18 Sep jetBlue
24 Sep - 02 Oct Southwest Airlines
21 Sep - 28 Sep Southwest Airlines

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

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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