Cheapest return flights from Washington to San Juan in August from $321

Best time to book flights for Washington (IAD) to San Juan (SJU) flights at AirHint

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

Return flights

12 Aug - 26 Aug United
11 Aug - 14 Aug Frontier Airlines
23 Aug - 30 Aug Delta
05 Aug - 13 Aug Frontier Airlines
04 Aug - 08 Aug United
15 Aug - 29 Aug United direct
05 Aug - 13 Aug United direct
15 Aug - 20 Aug United
08 Aug - 10 Aug Frontier Airlines
09 Aug - 23 Aug United
29 Aug - 03 Sep Volaris El Salvador
18 Aug - 01 Sep United direct
28 Aug - 02 Sep United

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

Skyscanner

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.

Book a cheap hotel in San Juan

Cheap car rent in San Juan