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

Return flights

16 Aug - 21 Aug	Spirit Airlines
31 Aug - 04 Sep	jetBlue	direct
30 Aug - 04 Sep	jetBlue	direct
22 Aug - 25 Aug	jetBlue
11 Aug - 16 Aug	Frontier Airlines	direct
04 Aug - 08 Aug	Frontier Airlines	direct
22 Aug - 26 Aug	jetBlue
04 Aug - 09 Aug	Frontier Airlines	direct
16 Aug - 19 Aug	Frontier Airlines
23 Aug - 26 Aug	jetBlue
24 Aug - 26 Aug	jetBlue
16 Aug - 21 Aug	jetBlue	direct
30 Aug - 03 Sep	jetBlue
30 Aug - 02 Sep	jetBlue
27 Aug - 02 Sep	Frontier Airlines
29 Aug - 03 Sep	Frontier Airlines
28 Aug - 03 Sep	Frontier Airlines
28 Aug - 02 Sep	Frontier Airlines
31 Aug - 01 Sep	jetBlue
30 Aug - 01 Sep	jetBlue

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 $235

Return flights