Cheap Flights from Ontario to Illinois
Did You Know?
Minneapolis-St Paul, MN has the most direct flights to Illinois.
The earliest flight from Ontario, CA leaves at 0:10 am.
There are 43 carriers flying into Illinois.
The most popular destination from Ontario, CA is Sky Harbor International.
There are 15 connecting cities from Ontario, CA to Illinois.
Denver, CO is the most popular connecting city from Ontario, CA to Illinois.
Cheap Domestic Flights from Ontario - ONT
American, Alaska, United, Delta, US Airways
US Airways, American, United, Delta
American, United, Delta, US Airways