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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

Flights
Airline
Lowest Price
American, Alaska, United, Delta, US Airways
$317
US Airways, American, United, Delta
$332
American, United, Delta, US Airways
$332
American, United
$331
Delta, American
$332
American
$332
Cheap Flights from Ontario to Illinois - from $317 Round trip from ONT to IL