Cheap flights from the United States to Illinois from $38
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from the United States to Illinois departing on 8/30. 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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Frontier flights from United States to Illinois
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Spirit Airlines flights from United States to Illinois
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How to get the cheapest flight ticket from United States 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 United States is in September. Flight prices, which tend to average around $177, 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 January is also cheap. Prices for this month can be found on momondo for an average of $180.
What is the cheapest day to depart on your flight to Illinois?
The cheapest day to depart from United States to Illinois is on a Wednesday when prices can be found for as low as $360. Flights from United States to Illinois on a Sunday will generally be more expensive and average around $469. 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 United States to Illinois during this time can be as low as $288. Flights at noon are often more expensive with an average ticket price of $443.
What is the cheapest United States to Illinois flight route?
Fly from Atlanta Hartsfield-Jackson to Chicago Midway for the best United States - Illinois flight prices
How far in advance should I book a flight to Illinois?
You are more likely to see cheaper flights to Illinois from United States when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $241 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from United States for as low as $200 on momondo.
What cabin class options are available on United States to Illinois flights?
There are 4 cabin classes available to choose from on United States to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from United States to Illinois?
Frontier and Spirit Airlines are the most popular carriers operating from United States to Illinois
What airlines fly to Illinois?
American Airlines, United Airlines and Frontier are the top three most popular airlines that fly to Illinois from United States according to our data. American Airlines is the first choice among our users, with 38% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 11 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.
How many flights depart from United States to Illinois on average per day?
As of June 2025, 572 flights take off from United States and land in Illinois each day. The most common flight departure time for this route is 8:00AM, with 41% of daily flights taking off at noon.
How many flights depart from United States to Illinois on average per week?
The number of flights available between United States and Illinois is 4,005 per week as of June 2025. The most frequent departure day is Mon, with 17% of weekly flights leaving on this day.
Cheap United States to Illinois flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from United States to Illinois
When did momondo last update prices for flights from United States to Illinois?
Prices for flights from United States to Illinois refresh daily.
How many operators does momondo search for flights from United States to Illinois?
As of June 2025, there are 12 operators available to choose from for flights from United States to Illinois.
How old do you have to be to fly from United States to Illinois?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from United States to Illinois.
What documentation or ID do you need to fly to Illinois?
The travel and health documents required for your trip to Illinois can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Illinois. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from United States to Illinois?
Based on momondo bookings for flights between United States and Illinois, the leading plane model is Boeing 737-800, making up 21.97% of the total bookings. Other popular models include Airbus A321neo with 11.25%, Boeing 737-900 with 9.95%, and Boeing 737 MAX 8 with 9.29%.
Best airlines flying from United States to Illinois
Compare and see reviews for airlines that fly from United States to Illinois with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $41 | Free Cancellation | Rating 6.3 8,096 reviews | |||
| PriceFrom $50 | Free Cancellation | Rating 5.9 3,293 reviews | |||
| PriceFrom $54 | Free Cancellation | Rating 7.2 710 reviews | |||
| PriceFrom $78 | Free Cancellation | Rating 7.3 2,920 reviews | |||
| PriceFrom $94 | Free Cancellation | Rating 8.0 7,969 reviews | |||
| PriceFrom $97 | Free Cancellation | Rating 7.4 8,852 reviews | |||
| PriceFrom $108 | Free Cancellation | Rating 7.8 2,533 reviews | |||
| PriceFrom $124 | Free Cancellation | Rating 8.0 4,278 reviews | |||
| PriceFrom $130 | Free Cancellation | Rating 6.9 340 reviews | |||
| PriceFrom $136 | Free Cancellation | Rating 7.2 10,000 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from United States to Illinois?
To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Illinois from United States.
Can I find flights from United States to Illinois with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for United States to Illinois flights to just show those with flexible booking policies.
How can momondo help me find flights from United States to Illinois?
momondo provides multiple filters to help you find the best flight to Illinois from United States. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.
I’m not ready to book a flight from United States to Illinois right now. Can momondo alert me if prices change?
Price alerts on flights to Illinois from United States 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.