The busiest passenger airlines that fly out of Will Rogers World Airport in Oklahoma City are Delta, Southwest and United. The other airlines that fly from Oklahoma City are American Airlines, Allegiant Air and Alaska Airlines.
Southwest flies from Oklahoma City to Atlanta, Georgia; Baltimore, Maryland; Denver, Colorado; Las Vegas, Nevada and Phoenix, Arizona. Southwest also flies to Midway Airport in Chicago, Illinois; Love Field in Dallas, Texas; Hobby Airport in Houston, Texas; and St. Louis, Missouri. United flies to Denver; Los Angeles, California; Newark, New Jersey and San Francisco, California. United also operates flights to Intercontinental Airport in Houston, O'Hare Airport in Chicago and Dulles Airport in Washington, D.C.
Delta operates flights from Oklahoma City to Atlanta; Detroit, Michigan; Minneapolis, Minnesota and Salt Lake City, Utah. American Airlines flies from Oklahoma City to Dallas/Fort Worth Airport, O'Hare Airport in Chicago and to Los Angeles. Alaska Airlines flies to Seattle, Washington. Allegiant Air flies to Las Vegas, Nevada. Allegiant also plans to begin service from Oklahoma City to Orlando, Florida in the spring of 2016.
Another airline that operated out of Oklahoma City was Great Plains Airlines, which used Will Rogers World Airport as its hub to Tulsa, Oklahoma; Albuquerque, New Mexico and Colorado Springs, Colorado until 2004. Despite the airport's name, no airline flies internationally from Oklahoma City as of 2015.