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

Return flights

27 Sep - 27 Sep	United
20 Sep - 23 Sep	Southwest Airlines
20 Sep - 27 Sep	Southwest Airlines
14 Sep - 19 Sep	Delta
07 Sep - 12 Sep	Delta
14 Sep - 18 Sep	Delta
19 Sep - 22 Sep	Southwest Airlines
14 Sep - 21 Sep	Southwest Airlines
27 Sep - 03 Oct	Delta
27 Sep - 04 Oct	Delta
29 Sep - 03 Oct	Delta
30 Sep - 04 Oct	Delta
12 Sep - 20 Sep	Spirit Airlines
01 Sep - 22 Sep	United
26 Sep - 04 Oct	United
26 Sep - 02 Oct	United
26 Sep - 03 Oct	Frontier Airlines

Also check the deals for one-way flights from Raleigh-durham to San Juan in September.

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

Cheapest return flights from Raleigh-durham to San Juan in September from 235€

Return flights