Cheapest return flights from Washington to San Juan in December from $148

AirHint found the following cheapest return flights from Washington (IAD) to San Juan (SJU) in December 2025 (see full year).

Return flights

28 Dec - 31 Dec Frontier Airlines
30 Dec - 10 Jan Frontier Airlines direct
30 Dec - 07 Jan Frontier Airlines
28 Dec - 29 Dec Frontier Airlines
28 Dec - 29 Dec Frontier Airlines direct
29 Dec - 01 Jan Frontier Airlines
30 Dec - 01 Jan Frontier Airlines
31 Dec - 07 Jan Frontier Airlines
27 Dec - 31 Dec Frontier Airlines
27 Dec - 01 Jan Frontier Airlines
27 Dec - 30 Dec Frontier Airlines direct
30 Dec - 02 Jan Frontier Airlines
29 Dec - 02 Jan Frontier Airlines
27 Dec - 29 Dec Frontier Airlines
28 Dec - 30 Dec Frontier Airlines direct
26 Dec - 31 Dec Frontier Airlines
27 Dec - 29 Dec Frontier Airlines direct
30 Dec - 04 Jan Frontier Airlines direct
26 Dec - 01 Jan Frontier Airlines
25 Dec - 31 Dec Frontier Airlines

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

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