$67+ Cheap flights from Ontario (ONT) to Illinois

Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to Illinois.

For as low as $323, Frontier can have you in Illinois from Ontario in 4h 03m. The distance between Ontario and Illinois is about 1695 mi. Both multi-stop and nonstop flights can be found to your destination and back.

$82 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on United Airlines and American Airlines, with prices starting from $102 and $112, respectively.

The most popular flight routes from Ontario to Illinois are Ontario - Chicago O'Hare Intl, Ontario - Chicago Midway and Ontario - Lambert-St Louis.

While on average a flight from Ontario to Illinois is generally $1,169, our data shows the cheapest flight currently is $101. When looking at the most popular route, (Ontario - Chicago O'Hare Intl), you can expect to pay $145 for that flight.

Yes. In addition to deals on Ontario to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Illinois.

Yes. Cheapflights offers flight deals from Ontario to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Currently, March is the cheapest month in which you can book a flight from Ontario to Illinois (average of $77). Flying from Ontario to Illinois in February is currently the most expensive (average of $165). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.