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

Return flights

25 Aug - 28 Aug	Delta
26 Aug - 28 Aug	Delta
27 Aug - 30 Aug	jetBlue
22 Aug - 27 Aug	jetBlue
27 Aug - 31 Aug	jetBlue
26 Aug - 30 Aug	Southwest Airlines
18 Aug - 29 Aug	jetBlue	direct
30 Aug - 03 Sep	jetBlue
21 Aug - 29 Aug	jetBlue	direct
30 Aug - 03 Sep	jetBlue	direct
21 Aug - 28 Aug	jetBlue
21 Aug - 23 Aug	jetBlue	direct
29 Aug - 05 Sep	jetBlue
27 Aug - 01 Sep	jetBlue
29 Aug - 05 Sep	jetBlue	direct
27 Aug - 01 Sep	jetBlue	direct
30 Aug - 08 Sep	jetBlue
30 Aug - 02 Sep	jetBlue
31 Aug - 01 Sep	jetBlue
30 Aug - 01 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 $285

Return flights