AirHint found the following cheapest return flights from Raleigh-durham (RDU) to San Juan (SJU) in August 2025 (see full year).

Return flights

21 Aug - 24 Aug	Frontier Airlines
18 Aug - 23 Aug	Frontier Airlines
21 Aug - 23 Aug	Frontier Airlines
03 Aug - 09 Aug	Frontier Airlines
21 Aug - 22 Aug	Frontier Airlines
21 Aug - 26 Aug	Frontier Airlines
22 Aug - 26 Aug	Frontier Airlines
18 Aug - 22 Aug	Frontier Airlines
29 Aug - 04 Sep	Frontier Airlines
19 Aug - 03 Sep	Frontier Airlines
04 Aug - 13 Aug	Frontier Airlines	direct
12 Aug - 13 Aug	Frontier Airlines

Also check the deals for one-way flights from Raleigh-durham 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 Raleigh-durham to San Juan in August from $168

Return flights