Cheapest one-way flights from Washington to San Juan in December from 53€

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

One-Way flights

11 Dec Frontier Airlines direct
10 Dec Frontier Airlines
05 Dec Frontier Airlines
31 Dec United direct
14 Dec Frontier Airlines direct
30 Dec Frontier Airlines direct
03 Dec Frontier Airlines
29 Dec Frontier Airlines
06 Dec Frontier Airlines
13 Dec Frontier Airlines

Also check the deals for return flights from Washington to San Juan in December.

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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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