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

Return flights

12 Dec - 17 Dec	Frontier Airlines
04 Dec - 09 Dec	jetBlue
15 Dec - 17 Dec	Spirit Airlines
11 Dec - 16 Dec	Frontier Airlines
04 Dec - 09 Dec	Frontier Airlines	direct
11 Dec - 16 Dec	jetBlue	direct
17 Dec - 20 Dec	Frontier Airlines
17 Dec - 20 Dec	jetBlue	direct
30 Dec - 06 Jan	jetBlue
15 Dec - 20 Dec	Spirit Airlines
28 Dec - 06 Jan	jetBlue
25 Dec - 31 Dec	jetBlue
26 Dec - 06 Jan	jetBlue
28 Dec - 04 Jan	jetBlue

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

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 December from $288

Return flights