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

Return flights

31 Aug - 05 Sep	United
31 Aug - 04 Sep	United
11 Aug - 16 Aug	Delta
18 Aug - 22 Aug	Delta
04 Aug - 07 Aug	Southwest Airlines
04 Aug - 08 Aug	Southwest Airlines
01 Aug - 08 Aug	Southwest Airlines
12 Aug - 22 Aug	Southwest Airlines
18 Aug - 21 Aug	Southwest Airlines
30 Aug - 13 Sep	United
04 Aug - 13 Aug	Southwest Airlines
26 Aug - 09 Sep	United
06 Aug - 13 Aug	jetBlue
24 Aug - 28 Aug	Delta
23 Aug - 06 Sep	United
27 Aug - 10 Sep	United
22 Aug - 05 Sep	United
31 Aug - 14 Sep	United
24 Aug - 07 Sep	United
28 Aug - 04 Sep	jetBlue

Also check the deals for one-way flights from Washington to San Juan in August.

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 August from 157€

Return flights