Cheapest one-way flights from Washington to San Juan in January from $67

AirHint found the following cheapest one-way flights from Washington (IAD) to San Juan (SJU) in January 2026 (see full year).

One-Way flights

03 Jan Frontier Airlines direct
26 Jan Frontier Airlines direct
01 Jan Frontier Airlines
30 Jan Frontier Airlines direct
09 Jan Frontier Airlines direct
05 Jan Frontier Airlines direct
22 Jan Frontier Airlines
08 Jan Frontier Airlines
15 Jan Frontier Airlines
14 Jan Frontier Airlines

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

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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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