$141 Find Cheap Flights from Montana 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 Montana to Illinois.

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Montana 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 Montana 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 Montana to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Montana and Illinois are connected by different airlines. The airlines that fly that route the most regularly are United Airlines (41 flights per week), American Airlines (36 flights per week), and Alaska Airlines (29 flights per week).

There are 12 airports in Illinois. The busiest airport is Chicago O'Hare Airport (ORD), with 91% 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 $306.

Based on KAYAK data, the cheapest day to fly to Illinois is Thursday where round-trip tickets can be as cheap as $419. On the other hand, the most expensive day to fly is Sunday, where round-trip prices are $601 on average.

The cheapest time of day to fly to Illinois is generally in the evening, when round-trip flights cost $431 on average. Morning departures are around 10% more expensive than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the morning, which is peak travel time and where the average cost of a ticket is $475.

The cheapest ticket to Illinois from Montana found in the last 5 days was to Chicago O'Hare Intl Airport, at $285 round-trip. The most popular route is Billings (BIL) to Chicago O'Hare Intl Airport (ORD) and the cheapest round-trip airline ticket found on this route in the last 5 days was $285.

The cheapest month for flights from Montana to Illinois is February, when tickets cost $205 (return) on average. On the other hand, the most expensive months are July and January, when the average cost of round-trip tickets is $259 and $253 respectively.

To get a below average price on the flight from Montana to Illinois, you should book around 4 weeks before departure, which saves you about 25% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 11 weeks before departure.

From Montana, there are direct flights to Illinois from 5 cities. The city with the most direct flights is Bozeman, with 85 direct flights each week.

There are around 22 direct flights from within Montana to Illinois every day. Most flights (53%) depart in the morning.

Each week there are around 152 direct flights from within Montana to Illinois. The most common day for departures is Saturday, with 16% of flights taking off on this day.

An average nonstop flight from Montana to Illinois takes 8h 51m, covering a distance of 1182 miles. The shortest route is Bozeman (BZN) to Chicago Midway Airport (MDW) with an average flight time of 2h 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 152 short-haul flights (up to 3 hour flight duration), with the most arriving from Bozeman.

Based on KAYAK flight searches, the most popular destination is Chicago (85% of total searches to Illinois). The next most popular destinations are St. Louis (8%) and Moline (4%). Searches for flights to Peoria (2%), to Dubuque (0%) and to Evansville (0%) are also popular.