LOUDOUN COUNTY, Va. (DC News Now) -- People heading west have another nonstop option when it comes to flying to a popular California destination...for a time. United Airlines began seasonal nonstop service from Washington Dulles International Airport (IAD) to Palm Springs International Airport (PSP) on Thursday, Dec. 19. Who is Dulles International Airport named for? The airline said there would be one flight in each direction, daily, through April 30, 2025. IAD's website says the aiport offers nonstop service to 85 domestic destinations and 59 international ones.