Cheapest return flights from Washington to San Juan in December from 121€

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

Return flights

04 Dec - 11 Dec Frontier Airlines direct
07 Dec - 11 Dec Frontier Airlines direct
04 Dec - 07 Dec Frontier Airlines direct
30 Dec - 06 Jan Frontier Airlines
05 Dec - 07 Dec Frontier Airlines
09 Dec - 13 Dec United direct
06 Dec - 10 Dec United direct
10 Dec - 17 Dec United direct
13 Dec - 20 Dec Frontier Airlines
12 Dec - 14 Dec Frontier Airlines
12 Dec - 19 Dec United direct
25 Dec - 06 Jan Frontier Airlines
15 Dec - 07 Jan Frontier Airlines
26 Dec - 06 Jan Frontier Airlines
20 Dec - 11 Jan Frontier Airlines
31 Dec - 06 Jan Frontier Airlines
30 Dec - 04 Jan Frontier Airlines
31 Dec - 06 Jan United direct
25 Dec - 05 Jan Frontier Airlines
18 Dec - 06 Jan Frontier Airlines

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

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