Cheap flights from Great Falls to Illinois from $151
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Great Falls to Illinois departing on 7/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Delta flights from Great Falls to Illinois
Our best Delta deals on Great Falls to Illinois flight tickets
United Airlines flights from Great Falls to Illinois
Our best United Airlines deals on Great Falls to Illinois flight tickets
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How to get the cheapest flight ticket from Great Falls to Illinois
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Illinois?
The cheapest month to fly to Illinois from Great Falls is in September. Flight prices, which tend to average around $307, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of September, then flying in December is also cheap. Prices for this month can be found on momondo for an average of $324.
What is the cheapest day to depart on your flight to Illinois?
The cheapest day to depart from Great Falls to Illinois is on a Tuesday when prices can be found for as low as $299. Flights from Great Falls to Illinois on a Saturday will generally be more expensive and average around $661. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.
What is the cheapest time of day to depart on your flight to Illinois?
Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from Great Falls to Illinois during this time can be as low as $349. Flights in the morning are often more expensive with an average ticket price of $660.
What is the cheapest Great Falls to Illinois flight route?
Fly from Great Falls to Chicago O'Hare Intl for the best Great Falls - Illinois flight prices
What cabin class options are available on Great Falls to Illinois flights?
There are 3 cabin classes available to choose from on Great Falls to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
Can stopping save me money on Great Falls to Illinois flights?
You could potentially save up to 67% on your flight if you consider stops on a Great Falls to Illinois flight.
What is the cheapest airline that flies from Great Falls to Illinois?
United Airlines and Delta are the most popular carriers operating from Great Falls to Illinois
What airlines fly to Illinois?
United Airlines, Delta and Alaska Airlines are the top three most popular airlines that fly to Illinois from Great Falls according to our data. United Airlines is the first choice among our users, with 56% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 3 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.
Cheap Great Falls to Illinois flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Great Falls to Illinois
When did momondo last update prices for flights from Great Falls Airport to Illinois?
Prices for flights from Great Falls Airport to Illinois refresh daily.
How many operators does momondo search for flights from Great Falls Airport to Illinois?
As of June 2025, there are 2 operators available to choose from for flights from Great Falls Airport to Illinois.
How old do you have to be to fly from Great Falls Airport to Illinois?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Great Falls Airport to Illinois.
What documentation or ID do you need to fly to Illinois?
The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Great Falls to Illinois?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Great Falls to Illinois is Embraer 175 (Enhanced Winglets) (50.00% of total bookings). The next most popular plane model is Embraer 170 (50.00%).
Best airlines flying from Great Falls to Illinois
Compare and see reviews for airlines that fly from Great Falls to Illinois with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $205 | Free Cancellation | Rating 8.0 10,000 reviews | |||
| PriceFrom $302 | Free Cancellation | Rating 7.4 8,840 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from Great Falls to Illinois?
It is quick and easy to find Great Falls to Illinois flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Illinois that suits you.
Can I find flights from Great Falls to Illinois with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for Great Falls to Illinois flights to just show those with flexible booking policies.
How can momondo help me find flights from Great Falls to Illinois?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from Great Falls.
I’m not ready to book a flight from Great Falls to Illinois right now. Can momondo alert me if prices change?
Price alerts on flights to Illinois from Great Falls are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.