The closest airport to Chapman University's campus is Santa Ana Airport (SNA, also known as Orange County or John Wayne). The Airport is served by America, United, Continental, Delta, American West, TWA, and Alaska Airlines. From there you can take a Blue or Super Shuttle for $10 each way. A cab costs approximately $25.
Long Beach Airport (LGB) is the next closest (approximately 30 minutes), and
Los Angeles Airport (
LAX) is approximately one hour from the University and is served by a large number of airlines. The Shuttle costs $16 from LAX. Cabs from LAX to Orange are very expensive but become increasingly reasonable if you can share them.