$113 Cheap United flights Washington (IAD) to San Juan (SJU)

Scoring cheap one-way United Airlines flights from IAD to SJU from $113 on Expedia is a cinch — just filter by “Price (lowest to highest).” Alternatively, check out our affordable return fares from $178 for your next exciting vacation.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Look for one-way or return flights to San Juan in October or September. You could find a cheap fare with United Airlines during these off-peak months.

Search for United Airlines flights from IAD to SJU about one month before you want to leave. The cheapest time to reserve an international flight is usually 18 to 29 days ahead of your departure date when you can save 17% versus booking four to five months in advance. No matter your fare class and itinerary, the best day to book international airfare is usually Sunday. Friday can be the most expensive. Passengers who book on a Sunday can save 17% on average compared to those who book on a Friday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Yes, you can travel from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU) on any of United Airlines’s 14 direct weekly flights. Make use of our “Nonstop” and “Airline” filters to find the United Airlines flight that’ll get you to SJU at a time that suits you.

The journey time for a direct United Airlines flight from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU) takes approximately 3h 47m.

If flexibility is what you’re after, Thursday offers the most choice for United Airlines flights from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU). You can pick from 2 different departures.

Jetting off from IAD at 8:30AM UTC-5, the first United Airlines flight to SJU arrives at 1:17PM UTC-4. Flying earlier in the day means you’re less likely to encounter cancellations or delays.* Not a morning person? The last United Airlines flight from IAD to SJU departs at 5:35PM UTC-5 and touches down at 10:22PM UTC-4.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Luis Munoz Marin Intl. Airport (SJU) is the main San Juan hub for United Airlines flights from Washington Dulles Intl. Airport (IAD).

A rewarding loyalty program and the ability to rack up points through United Mileage Plus are the start of the reasons to jet off from IAD to SJU with United Airlines. Plus, by joining Expedia’s free One Key™ program, you can receive OneKeyCash™* in addition to United Airlines’s loyalty program earnings. It’s yours to spend on future bookings.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

You’ll likely board a Boeing 737 MAX 9 or a Boeing 737 MAX 8 when flying United Airlines from Washington Dulles Intl. Airport (IAD) to Luis Munoz Marin Intl. Airport (SJU). However, keep in mind that a different aircraft may be used due to operational factors.

Changes are generally free within 24 hours of making a booking, but your airline may add a charge after that time. For further information about modifying your flights, head to your “Trips,” select your flight and click on “Manage Booking.” If you want the flexibility to change your itinerary without extra charges, apply the “Changes included” and “No cancel fee” filters when organizing your next getaway.