$223 Cheap United flights Washington (IAD) to Philipsburg (SXM)

Use the "Price (lowest to highest)" filter on Expedia to search for cheap United Airlines round-trip flights from $449 from IAD to SXM. Affordable one-way options from $223 are available too.**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.

To find affordable flights from IAD to SXM with United Airlines, start your search about one month before your planned departure. You can save 17% when you lock in your international tickets 18 to 29 days ahead instead of booking four to five months in advance. Another tip? Booking on Sunday can lead to average savings of 17% compared to Friday (the most expensive day).**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.

The first flight from IAD to SXM with United Airlines departs at 8:39AM UTC-5. You'll touch down at 1:44PM UTC-4. The final United Airlines flight of the day takes off at 8:39AM UTC-5 and arrives at 1:44PM UTC-4. With approximately 20% fewer cancellations for morning and mid-morning flights, heading out early is often the wisest option.**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.

A rewarding loyalty program and the chance to rack up points through United Mileage Plus are the start of the reasons to fly from IAD to SXM with United Airlines. Plus, when you join our One Key™ program, you can earn OneKeyCash™* on top of any airline 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.