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

Return flights

26 Jul - 01 Aug	Southwest Airlines
14 Jul - 24 Jul	Southwest Airlines
13 Jul - 16 Jul	Southwest Airlines
13 Jul - 17 Jul	Southwest Airlines
08 Jul - 11 Jul	United
29 Jul - 07 Aug	Southwest Airlines
13 Jul - 18 Jul	United
06 Jul - 11 Jul	American Airlines
14 Jul - 19 Jul	Southwest Airlines
09 Jul - 16 Jul	Southwest Airlines
06 Jul - 09 Jul	United
12 Jul - 15 Jul	Southwest Airlines
23 Jul - 06 Aug	United
30 Jul - 06 Aug	Southwest Airlines
31 Jul - 03 Aug	Southwest Airlines
18 Jul - 01 Aug	United
19 Jul - 02 Aug	United
22 Jul - 05 Aug	United
25 Jul - 08 Aug	United
21 Jul - 04 Aug	United

Also check the deals for one-way 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 return flights from Washington to San Juan in July from 140€

Return flights