AirHint found the following cheapest return flights from Raleigh-durham (RDU) to San Juan (SJU) in May 2026 (see full year).

Return flights

11 May - 16 May	Frontier Airlines
10 May - 15 May	Frontier Airlines
01 May - 04 May	Frontier Airlines
09 May - 16 May	Frontier Airlines
01 May - 03 May	Frontier Airlines
13 May - 18 May	Frontier Airlines
07 May - 11 May	Frontier Airlines
14 May - 18 May	Frontier Airlines
08 May - 11 May	Frontier Airlines	direct
18 May - 21 May	Frontier Airlines

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

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 May from 153€

Return flights