Cheapest return flights from Washington to San Juan in December from 126€

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

Return flights

01 Dec - 04 Dec Frontier Airlines direct
14 Dec - 20 Dec Frontier Airlines direct
11 Dec - 19 Dec Frontier Airlines direct
14 Dec - 22 Dec Frontier Airlines direct
07 Dec - 11 Dec Frontier Airlines
05 Dec - 19 Dec Frontier Airlines
11 Dec - 21 Dec Frontier Airlines direct
01 Dec - 12 Dec Frontier Airlines
15 Dec - 20 Dec Frontier Airlines
15 Dec - 22 Dec Frontier Airlines
14 Dec - 12 Jan Frontier Airlines
11 Dec - 08 Jan Frontier Airlines
31 Dec - 21 Jan Frontier Airlines
31 Dec - 21 Jan United direct
31 Dec - 26 Jan Frontier Airlines
30 Dec - 24 Jan Frontier Airlines
16 Dec - 13 Jan Frontier Airlines
29 Dec - 06 Jan Frontier Airlines
30 Dec - 20 Jan Frontier Airlines
30 Dec - 06 Jan Frontier Airlines

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

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