With 85.4 percent of flights leaving within 15 minutes of scheduled departure times, Salt Lake International Airport is the fifth most "on-time" airport among 30 majuor U.S. airports..(Note: The worst time to fly out of Salt Lake City is from 8 to 9 p.m., when only 63 percent of flights leave on time.)

Percent of airport departures that leave on time

Memphis 87.4% (Best in U.S.)

Las Vegas 85.9%

Los Angeles 85.9%

D.C. (Dulles) 85.7%

Salt Lake City 85.4%

N.Y. (La Guardia) 76.6%

Chicago 76.4%

Philadelphia 76.0% (Worst in U.S.)

Source: U.S. Department of Transportation