Welcome | Sign out

Cheap Flights from Ontario to Illinois

Popular 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
$236
Cheap Flights from Ontario to Illinois - from $236 Round trip from ONT to IL