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

Return flights

14 Jul - 17 Jul	United
14 Jul - 07 Aug	United
12 Jul - 15 Jul	Southwest Airlines
21 Jul - 24 Jul	United
09 Jul - 09 Jul	jetBlue
22 Jul - 29 Jul	Delta
09 Jul - 16 Jul	Delta
20 Jul - 26 Jul	Delta
20 Jul - 23 Jul	Delta
24 Jul - 01 Aug	Southwest Airlines
13 Jul - 17 Jul	United
22 Jul - 31 Jul	United
30 Jul - 03 Aug	jetBlue	direct
18 Jul - 01 Aug	United
20 Jul - 03 Aug	United
22 Jul - 05 Aug	United
31 Jul - 05 Aug	jetBlue
19 Jul - 02 Aug	United
26 Jul - 09 Aug	United
30 Jul - 13 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 $176

Return flights