The flight distance from Washington Dulles International Airport (IAD) in Washington, United States to Sines Airport (SIE) in Sines Airport, Portugal is 5,834 kilometers (3,625 miles / 3,150 nautical miles). The estimated flight time for this route is approximately 8h, flying east northeast at a heading of 68°.

This is a long-haul route typically operated by wide-body aircraft such as the Boeing 777 or Airbus A350. Full meal service, in-flight entertainment, and comfort amenities are standard.

This is an international route connecting United States with Portugal. It is an intercontinental flight between North America and Europe. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 00:12 in Washington, it's 05:12 in Sines Airport. The 5-hour time difference may cause some jet lag. Most travelers adjust within a day or two.

The return flight from Sines Airport (SIE) to Washington (IAD) follows a heading of 294° (west northwest). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the Washington Dulles International Airport (IAD) and Sines Airport (SIE) detail pages, or use our flight duration calculator to compare other routes.