Cheapest one-way flights from Washington to San Juan in December from $46

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

One-Way flights

29 Dec Frontier Airlines direct
30 Dec Frontier Airlines direct
31 Dec United direct
31 Dec American Airlines
27 Dec Frontier Airlines direct
28 Dec Frontier Airlines direct
26 Dec Frontier Airlines direct
25 Dec Frontier Airlines
24 Dec Delta
25 Dec United direct

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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