Cheapest return flights from Washington to San Juan in September from 391€

Best time to book flights for Washington (IAD) to San Juan (SJU) flights at AirHint

AirHint found the following cheapest return flights from Washington (IAD) to San Juan (SJU) in September 2025 (see full year).

Return flights

18 Sep - 22 Sep United

Also check the deals for one-way flights from Washington to San Juan in September.

Skyscanner

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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