Cheapest one-way flights from Washington to San Juan in December from 90€

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
31 Dec United direct
14 Dec Frontier Airlines direct
30 Dec Frontier Airlines direct
12 Dec Frontier Airlines
15 Dec Frontier Airlines
08 Dec Frontier Airlines
06 Dec Frontier Airlines
23 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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