AirHint found the following cheapest one-way flights from Washington (DCA) to San Juan (SJU) in July 2025 (see full year).

One-Way flights

29 Jul	Southwest Airlines
01 Jul	Southwest Airlines
14 Jul	United
08 Jul	Delta
12 Jul	Southwest Airlines
31 Jul	Southwest Airlines
05 Jul	Southwest Airlines
12 Jul	jetBlue	direct
06 Jul	jetBlue
03 Jul	American Airlines

Also check the deals for return flights from Washington to San Juan in July.

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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Cheapest one-way flights from Washington to San Juan in July from $83

One-Way flights