Cheapest one-way flights from Washington to San Juan in December from $84

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
07 Dec Frontier Airlines direct
31 Dec Frontier Airlines
30 Dec Frontier Airlines
10 Dec United direct
30 Dec Frontier Airlines direct
14 Dec Frontier Airlines direct
31 Dec United direct
05 Dec Frontier Airlines
12 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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