Cheapest return flights from Washington to San Juan in December from $244

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

Return flights

11 Dec - 14 Dec Frontier Airlines direct
07 Dec - 13 Dec Frontier Airlines
04 Dec - 08 Dec Frontier Airlines
15 Dec - 20 Dec United
12 Dec - 20 Dec United direct
04 Dec - 09 Dec United direct
16 Dec - 20 Dec United
14 Dec - 21 Dec Frontier Airlines direct
13 Dec - 21 Dec Frontier Airlines
30 Dec - 10 Jan United
04 Dec - 08 Dec United direct
29 Dec - 02 Jan Frontier Airlines direct
23 Dec - 02 Jan Frontier Airlines direct
30 Dec - 04 Jan Frontier Airlines direct
23 Dec - 03 Jan Frontier Airlines direct
23 Dec - 01 Jan Frontier Airlines
28 Dec - 03 Jan Frontier Airlines direct
28 Dec - 02 Jan Frontier Airlines direct
22 Dec - 03 Jan Frontier Airlines direct
26 Dec - 02 Jan Frontier Airlines direct

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

Skyscanner

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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