$117 Find Cheap Flights from Idaho Falls to Illinois

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Idaho Falls to Illinois departing on 2/2. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Illinois

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Idaho Falls to Illinois, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Idaho Falls to Illinois, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Idaho Falls to Illinois

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Chicago
Chicago1 stop$298
Moline
Moline1 stop$400
St. Louis
St. Louis1 stop$371
Chicago
Chicago1 stop$298
Moline
Moline1 stop$400
St. Louis
St. Louis1 stop$371

Book Cheap Idaho Falls to Illinois Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Idaho Falls to Illinois that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Idaho Falls to Illinois

Mon, Jan 26 - Tue, Feb 3
Alaska Airlines Logo
6:58 pm - 5:10 pmIDA-ORD
21h 12m1 stop
Alaska Airlines Logo
6:06 pm - 6:18 pmORD-IDA
25h 12m1 stop
$298Alaska Airlines
Find Deal
Mon, Jan 26 - Tue, Feb 3
Alaska Airlines Logo
6:58 pm - 2:38 pmIDA-ORD
18h 40m1 stop
Alaska Airlines Logo
3:44 pm - 10:59 pmORD-IDA
32h 15m2 stops
$324Alaska Airlines
Find Deal
Sun, Jan 18 - Thu, Jan 22
Hawaiian Airlines Logo
9:00 am - 5:10 pmIDA-ORD
7h 10m1 stop
Hawaiian Airlines Logo
3:35 pm - 10:59 pmORD-IDA
8h 24m1 stop
$364Hawaiian Airlines
Find Deal
Sun, Jan 18 - Thu, Jan 22
Hawaiian Airlines Logo
9:00 am - 5:10 pmIDA-ORD
7h 10m1 stop
Hawaiian Airlines Logo
3:35 pm - 10:59 pmORD-IDA
8h 24m1 stop
$370Hawaiian Airlines
Find Deal
Tue, Jan 6 - Tue, Jan 13
United Airlines Logo
5:00 am - 1:16 pmIDA-STL
7h 16m1 stop
United Airlines Logo
8:45 am - 1:30 pmSTL-IDA
5h 45m1 stop
$371United Airlines
Find Deal
Tue, Jan 6 - Tue, Jan 13
United Airlines Logo
5:00 am - 1:16 pmIDA-STL
7h 16m1 stop
United Airlines Logo
11:20 am - 9:14 pmSTL-IDA
10h 54m2 stops
$376United Airlines
Find Deal
Sun, Jan 18 - Thu, Jan 22
Alaska Airlines Logo
6:58 pm - 1:54 pmIDA-STL
17h 56m1 stop
Alaska Airlines Logo
2:50 pm - 10:59 pmSTL-IDA
9h 09m1 stop
$377Alaska Airlines
Find Deal
Mon, Jan 26 - Tue, Feb 3
Delta Logo
6:35 pm - 9:53 amIDA-MDW
14h 18m2 stops
Delta Logo
1:26 pm - 10:57 pmMDW-IDA
10h 31m2 stops
$391Delta
Find Deal
Mon, Jan 26 - Tue, Feb 3
Delta Logo
6:35 pm - 8:42 amIDA-ORD
13h 07m2 stops
Delta Logo
1:58 pm - 10:57 pmORD-IDA
9h 59m2 stops
$391Delta
Find Deal
Tue, Jan 27 - Sat, Jan 31
American Airlines Logo
2:07 pm - 9:58 pmIDA-MLI
6h 51m1 stop
American Airlines Logo
6:00 am - 1:37 pmMLI-IDA
8h 37m1 stop
$409American Airlines
Find Deal
Booking Insights

KAYAK's insights & trends for Idaho Falls to Illinois flights

Get data-powered insights and trends into flights from Idaho Falls to Illinois to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest Idaho Falls to Illinois flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Illinois from Idaho Falls found in the last 72 hours was to Chicago, at $391 round-trip. The most popular route is from Idaho Falls (IDA) to Chicago O'Hare Intl Airport (ORD), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $391.

Can I save money by flying with a layover from Idaho Falls to Illinois?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $533, prices are generally cheapest when you fly direct.

What’s the cheapest day of the week to fly from Idaho Falls to Illinois?

The average price of all round-trip flights from Idaho Falls to Illinois clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Illinois on a Tuesday and more expensive on a Sunday. On your return trip to Idaho Falls, you should consider flying back on a Friday, and avoid Wednesdays for better deals.

Good to know

Low seasonJanuary
Cheapest flight$117
Best time to beat the crowds but there is an average 40% increase in price.
Most popular time to fly and prices are also 27% lower on average.
Flight from Idaho Falls to Chicago O'Hare Airport

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Idaho Falls to Illinois?

    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 Idaho Falls to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Idaho Falls to Illinois?

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

  • What is the Hacker Fare option on flights from Idaho Falls to Illinois?

    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 Idaho Falls to Illinois with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Idaho Falls to Illinois?

    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 Idaho Falls to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Illinois?

    The cheapest time of day to fly to Illinois is generally in the morning, when round-trip flights cost $413 on average. Morning departures are around 33% 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 $616.

Reviews of the top 3 airlines serving from Idaho Falls to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Idaho Falls to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Idaho Falls to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
DeltaOverall score based on 8011 reviews
7.9Entertainment
7.9Comfort
8.1Boarding
8.5Crew
7.3Food
Airline reviews

Good seats in Main cabin, excellent service and excellent landing

10.0 ExcellentAnonymous, Dec 2025SEA - MSP
Read more Delta reviews

Good seats in Main cabin, excellent service and excellent landing

My flight was cancelled with no explanation after I had already cleared security. I was given 4 options to rebook, only one being non-stop like I had paid for. I grabbed it. It was 4 plus hours later and then took off even later. Biggest complaint is that I booked early and had an aisle seat. They gave me a "window" seat in front of the exit row, so the seat did not decline. I weigh all of 103 #s and it was tight for me! For what I paid, I feel I was kind of ripped off. I think they should have given me the empty comfort seat for the inconvenience. There was no apology nor any explanation as to why the flight was cancelled. My guess is it benefitted Delta in some way.

Very smooth, on-time, and pleasantly uneventful flight. The team at the gate and on board were professional and genuinely courteous. The pilot kept us well updated throughout, and both takeoff and landing were steady and enjoyable without any drama. Just a good, solid flight. Thank you! 💗

Staff was exceptional! Everyone was kind, professional and friendly making the trip very pleasant. Thank you!

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

We had a lot of really rough weather but that was not Delta's fault. Pilot was amazing.

First, Delta needs more flights to/from Miami. Second, a 1000pm leaving at 1230pm is unacceptable from their biggest airport world hub. Another aircraft could have been used such as the aircraft scheduled to be used in the morning for that exact same route. Yes, I did get me there but the lack of sleep the next day didn't help me enjoy my entire trip since I was busy with activities during the weekend. This can be and is expected from Spirit (going bankrupt) and Frontier (despite they're nickel and dimers). But from Delta's World Hub? That's totally unacceptable!

This flight was straightforward and without difficulty. Service was OK, but I continue to be underwhelmed by level of attention given to Sky Priority passengers.

It would’ve been nice for all that money to have a more substantial snack for free. I remember once upon a time getting a very nice turkey sandwich with Swiss cheese on whole wheat bread for no charge along with a drink. I guess those days are gone. it’s a little insulting being given a cookie or a bag of baked chips Going forward I’ll just bring my own.

Our flight from SFO to MSP was right on time on 11/15/2025. No delays. As we approached MSP at about 8 pm, we circled in the air until 8:40 pm so I don't call that efficient for MSP. I think the captain should announce the delay and why. (as if we all don't know that we are just circling around the area, slowing down, speeding up, slowing down.) Thank you. Marilyn Fischer

Very bad! They kept delaying my flight and wouldn’t do anything about it

Door to door, the crew and staff were amazing. It was a stressful travel day with delays, but they were focused on customers and doing what they could to get us to our destinations.

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

After boarding the plane in Chicago, the passengers were told that there was a technical problem with the plane. Passengers remained on the plane as they tried to fix the problem. After what was probably an hour passengers were told that there was a need to change planes as the problem was not solved. Passengers disembarked and boarded another plane. After taxing to the runway and waiting for takeoff, passengers were told that owing to the thunderstorm the flight was unable to take off but would try and reroute. After some time passengers were told there wasn't enough fuel for the new route and the plane had to return to the gate for additional fuel. after another log delay the flight got underway. On the plane there was food, drinks, ice or entertainment. We were a glass of water, which appeared rationed. Flight arrived about 5 hours late. The pilot was fantastic and communicated with the passengers throughout the ordeal.

Better WiFi. I cannot understand that in 2025, United is so behind on a technology that is now a necessity and still painfully unreliable, slow and keeps disconnecting.

Trip was great. A wild landing in Ottawa with the wind and rain, but the pilot did a great job. Always love flying United.👍

Excellent experience. Starting with the agent at the Premier bag drop who noticed I was very early for my scheduled flight and offered to rebook me on an earlier flight with my seat preference. She would not let me leave the counter until she knew that all of the changes and new boarding pass showed up on my United app. At the gate, the flight boarded quickly such that we departed early and the flight was smooth. We arrived 20 minutes early at ORD and I was able to be home in time for dinner. One of the best flights I've had.

Salina to travers city was great! But the sept 24 Tranverse city was not! Traverse city to chichago was cancelled, i went to Denver & got to Salina 6 hours later!

See previous note about the passenger in Denver who threw my husband's bag out of the overhead bin in order to maker room for his own. And the flight attendant back up the new passenger.

I enjoyed the extra leg room compared to other airlines. The first stewards made my daughter’s birthday special by giving her an extra snack. Then the last one coming home from Chicago to Appleton made our night really enjoyable Thanks for making our trip enjoyable

It was good..clean, comfy seat. Friendly warm welcoming crew. Was able to check my cabin luggage at the gate which I was able to pickup in a decent time from baggage claim. The app gave all updates from delays to baggage claim info. Overall smooth flight.

It was a typical flight. We had a delay which seems to be the normality now. And we had no in flight service due to conditions.

After we landed we sat on the tarmac for 1.5 hours waiting to get to our gate. Ridiculous.

Terrible. Flight delayed for more than 8 hours with only a $12 meal voucher provided for the inconvenience. The airplane did not have breaks on arrival yet they still made us go through the motions and board on time knowing we could not take off then sit for 40+ minutes before having to get of the time. A complete waste of my time. I cannot believe they can stay business with these shenanigans. I’ll avoid this company like the plague moving forward as the lack of accountability is disgraceful.

This was the best 2 flights I have had with American out of SGF. Great crew both flights.

Excellent - explanations were clear staff was nice and flight was comfortable

Lost bag and 2 days no word leaving for cruise no clothes or stuff

Any flight to ORD after about 2pm this summer has been challenging. Flight was delayed getting in (coming from ORD) and that led to it not leaving before a ground stop due to lightening before they could fuel the plane, and so forth. They made up some time but we were still late in arriving at ORD, and that led to missed connections.

Food was ok, but not as good as I have had before on AA.

Everything you need to know for your flight from Idaho Falls to Illinois

Information on your arrival and departure airports