Cheapest return flights from Washington to San Juan in December from 331€

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

Return flights

15 Dec - 19 Dec Frontier Airlines
26 Dec - 02 Jan Frontier Airlines direct
21 Dec - 28 Dec Frontier Airlines direct
20 Dec - 03 Jan Frontier Airlines direct
31 Dec - 05 Jan Delta
17 Dec - 30 Dec United
25 Dec - 31 Dec United direct
19 Dec - 31 Dec United direct
27 Dec - 04 Jan United
27 Dec - 03 Jan United

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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