$135 Find Cheap Flights from Ontario to Illinois - Compare and Save

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Illinois.

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ontario to Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Ontario to Illinois with an airline and back with another airline.

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Ontario to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Ontario and Illinois are connected by different airlines. The airlines that fly that route the most regularly are United Airlines (145 flights per week), Air Canada (130 flights per week), and Air New Zealand (66 flights per week).

There are 12 airports in Illinois. The busiest airport is Chicago O'Hare Airport (ORD), with 92% of all flights arriving there.

Prices will differ depending on the departure airport, but generally, the cheapest airport to fly to in Illinois is Chicago Midway Airport (MDW), with an average flight price of $150.

Based on KAYAK data, the cheapest day to fly to Illinois is Friday where round-trip tickets can be as cheap as $469. On the other hand, the most expensive day to fly is Monday, where round-trip prices are $747 on average.

The cheapest time of day to fly to Illinois is generally at night, when round-trip flights cost $397 on average. Morning departures are around 32% cheaper than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the evening, which is peak travel time and where the average cost of a ticket is $739.

The cheapest ticket to Illinois from Ontario found in the last 5 days was to Chicago O'Hare Intl Airport, at $145 round-trip. The most popular route is Ottawa (YOW) to Chicago O'Hare Intl Airport (ORD) and the cheapest round-trip airline ticket found on this route in the last 5 days was $145.

The cheapest month for flights from Ontario to Illinois is January, when tickets cost $67 (return) on average. On the other hand, the most expensive months are November and May, when the average cost of round-trip tickets is $578 and $480 respectively.

To get a below average price on the flight from Ontario to Illinois, you should book around 3 weeks before departure, which saves you about 45% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 24 weeks before departure.

From Ontario, there are direct flights to Illinois from 2 cities. The city with the most direct flights is Toronto, with 570 direct flights each week.

There are around 94 direct flights from within Ontario to Illinois every day. Most flights (47%) depart in the morning.

Each week there are around 654 direct flights from within Ontario to Illinois. The most common day for departures is Sunday, with 15% of flights taking off on this day.

An average nonstop flight from Ontario to Illinois takes 7h 13m, covering a distance of 605 miles. The shortest route is Toronto Island Airport (YTZ) to Chicago Midway Airport (MDW) with an average flight time of 1h 50m.

There are not any long-haul (6-12 hour flight duration) or medium-haul (3-6 hour flight duration) flights to Illinois. Instead, there are 654 short-haul flights (up to 3 hour flight duration), with the most arriving from Toronto.

Based on KAYAK flight searches, the most popular destination is St. Louis (86% of total searches to Illinois). The next most popular destinations are Moline (6%) and Peoria (2%). Searches for flights to Decatur (2%), to Bloomington (2%) and to Champaign (2%) are also popular.