Cheapest one-way IAD–SJU flights, July

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

One-Way flights

13 Jul Frontier Airlines
29 Jul Frontier Airlines
28 Jul Frontier Airlines
08 Jul Frontier Airlines
22 Jul Frontier Airlines
17 Jul Allegiant Air
09 Jul Frontier Airlines
04 Jul Frontier Airlines
06 Jul Frontier Airlines
23 Jul Frontier Airlines

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

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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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