$96 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 5/11. 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
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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$299
Moline
Moline2 stops$609
St. Louis
St. Louis1 stop$279
Chicago
Chicago1 stop$299
Moline
Moline2 stops$609
St. Louis
St. Louis1 stop$279

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

Sun, Mar 29 - Fri, Apr 10
Delta Logo
6:55 pm - 12:21 am
IDA
-
STL
4h 26m
1 stop
Delta Logo
7:15 am - 12:27 pm
STL
-
IDA
6h 12m
1 stop
$279Delta
Sun, Mar 29 - Tue, Apr 7
Delta Logo
6:55 pm - 12:21 am
IDA
-
STL
4h 26m
1 stop
Delta Logo
12:28 pm - 10:16 pm
STL
-
IDA
10h 48m
2 stops
$284Delta
Wed, Apr 8 - Mon, Apr 13
Delta Logo
6:55 pm - 12:21 am
IDA
-
STL
4h 26m
1 stop
Delta Logo
6:45 pm - 10:40 pm
STL
-
IDA
4h 55m
1 stop
$294Delta
Sun, Aug 2 - Sat, Aug 8
United Airlines Logo
6:03 pm - 12:44 am
IDA
-
ORD
5h 41m
1 stop
United Airlines Logo
5:00 am - 9:55 am
ORD
-
IDA
5h 55m
1 stop
$299United Airlines
Sun, Apr 19 - Thu, Apr 23
Multiple Airlines Logo
9:59 am - 6:47 am
IDA
-
ORD
43h 48m
2 stops
Multiple Airlines Logo
9:18 pm - 3:27 pm
ORD
-
IDA
19h 09m
1 stop
$326Multiple Airlines
Tue, Mar 3 - Sat, Mar 7
United Airlines Logo
2:40 pm - 10:52 pm
IDA
-
ORD
7h 12m
1 stop
United Airlines Logo
7:00 am - 1:30 pm
ORD
-
IDA
7h 30m
1 stop
$329United Airlines
Wed, Apr 15 - Wed, Apr 22
Alaska Airlines Logo
6:00 am - 2:51 pm
IDA
-
STL
7h 51m
1 stop
Alaska Airlines Logo
7:00 am - 3:29 pm
STL
-
IDA
9h 29m
1 stop
$337Alaska Airlines
Thu, May 7 - Tue, May 12
Alaska Airlines Logo
4:06 pm - 11:59 pm
IDA
-
ORD
6h 53m
1 stop
Alaska Airlines Logo
6:00 am - 3:29 pm
ORD
-
IDA
10h 29m
1 stop
$337Alaska Airlines
Sun, Apr 19 - Thu, Apr 23
Multiple Airlines Logo
9:59 am - 6:47 am
IDA
-
ORD
43h 48m
2 stops
Multiple Airlines Logo
9:18 pm - 3:27 pm
ORD
-
IDA
19h 09m
1 stop
$353Multiple Airlines
Tue, Mar 24 - Mon, Mar 30
American Airlines Logo
2:18 pm - 1:21 pm
IDA
-
MLI
22h 03m
2 stops
American Airlines Logo
7:09 pm - 1:48 pm
MLI
-
IDA
19h 39m
2 stops
$903American Airlines
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 $359 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 $359.

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.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $499 on average.

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 seasonFebruary
Cheapest flight$96
Best time to beat the crowds but there is an average 2% increase in price.
Most popular time to fly and prices are also 21% 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 afternoon, when round-trip flights cost $426 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 $426.

Top tips for finding cheap flights to Illinois

  • Looking for a cheap flight? 25% of our users found tickets from Idaho Falls to the following destinations at these prices or less: Chicago $317 one-way - $424 round-trip

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 8212 reviews
7.9Comfort
7.8Entertainment
7.2Food
8.1Boarding
8.5Crew
Airline reviews

The crew, and fellow passengers, were super gracious and kind. There seemed to be plenty of bin space even though the plane was full. It’s nice to get a glass of wine with dinner in Premiere seating, and there was a lot of food.

10.0 ExcellentGrace, Feb 2026
LAX - JFK
Read more Delta reviews

The crew, and fellow passengers, were super gracious and kind. There seemed to be plenty of bin space even though the plane was full. It’s nice to get a glass of wine with dinner in Premiere seating, and there was a lot of food.

First flight out and was 85 minutes delayed. Notification came out way too late

Delta flights recently are always delayed AND at jfk tney get the gates further away (need To walk 20’ to get to them/all the way at the end of the terminal). Not sure whats happening but price doesnt match experience!

Everything I mentioned earlier - the airbus was more comfortable indeed and the experience was further enhanced.

Delta continues to set the benchmark for traveler-friendly service with minimal disruption and clear communication within the mainland US (coast to coast). I am consistently pleased to be a Delta customer, and this experience once again met my expectations. There was a brief delay departing from MIA due to a technical issue that required the aircraft to return to the gate. However, the situation was handled professionally and transparently. Fortunately, my planned layover allowed ample buffer time, so the adjustment caused no stress. Overall, another smooth and reassuring experience.

Good experience and the flight landed early. There was no food I had or entertainment.

Flight was delayed and no reasons provided. After the passengers were boarded, the crew made announcement that the captain has jot arrived and he would take another 15 mins. All passengers patiently sat until the captain came and started. Terrible experience!

Flight was delayed. No information on why it was delayed. After we boarded the flight, , the crew made announcement that the captain hs not arrived and he will take 15 mins more to arrive. Passengers were just sitting patiently for the captain to arrive and start, Terrible experience.

Totally worth the miles to upgrade to Delta Comfort. Plenty of legroom.

This was my first time flying Delta ever and I had a great experience!

Crew was great (professional, attentive, prompt). Snacks for 4 hrs flight is deplorable.

United Airlines is my preferred airlines and I am thankful for Gary who also help support me on the phone to switch my flight literally last min.

Seated dude next to me even though lots of empty rows. But main thing was we sat on the tarmac after landing for 30 minutes because of, in the words of the dude who sat next to me, “operational incompetence”. We got changing directions about where to pick up gate checked bags. Pilot and flight attendant were awesome though.

It was a pretty standard flight... until the almost hour and a half spent on the taxi way. I get that the weather has been poor but the delay had nothing to do with the weather and more to do with a plane with several issues tying up the gate. I get that that happens from time to time but this has been EVERY flight I've been on for the past 5 years and I fly 3 to 5 times a year. This isn't just United... it's American, it's Delta. It's an issue with the entire industry. I work for UPS and packages on a cargo plane get better service than people do these days. Anymore I HATE flying.

Perfect flight. Smooth flight. Arrived 20 minutes early at destination. Excellent service.

The flights were on time which was great give. It was holiday travel season and there’d been some weather issues. The only complaint and this is every time with United is the terrible seat design. The head rest is not built for comfort and having my neck bent forward for a cross country trip reminded me while I try not to take United flights as a rule.

Everything was absolutely wonderful from check in to baggage claim. Staff was very professional and sweet. Will definitely recommend United to family and friends.

They did the one thing that really matters - got to Chicago early.

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

American Airlines was great and worked very hard to change my ticket so I could get an earlier, direct flight back to Dallas. However, I was informed that Kayak made mistakes with my itinerary and classified my ticket as desiring to be on the earlier flight instead of taking the necessary step of calling AA to get me on the standby list. This ended up keeping me from being added to the standby list and delayed me getting home by 6 hours. I am happy to discuss this further with Kayak so they can correct their procedures so this won't happen again.

Waited for oxygen tanks for 30 minutes after boarding was complete.

We flew in first class. The crew did not offer drinks before the flight took off, but they treated us well during the flight. The food was excellent. There was actually too much food served, but it was nice to have all the options.

Update to handle the delay was very bad, crews no smiles or welcome or thanks. Don’t care attitude

Pilot navigated severe weather/snow storm with skill. Described his intentions clearly

Little warm on the plane and delayed for an hour

So excited very proud first of all I wanna thank kayak all updates very professional and fast alart And amazing cabin crew so nice to me they deserve big salute

The boarding process needs to be fixed. The zone don't work, especially when there is hardly anyone in zones 3, 4,and 5, leaving the majority of the passengers backed up in the aisle, especially because passengers seated near the front are blocking passengers who are seated in the rear of the plane. It would also help if the size of carry on bags was more strictly enforced.

Awful. They won’t help me with anything. I booked on American but they abdicated to Iberia. The ticket was overpriced. Everything negative

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

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

Information on your arrival and departure airports