$131 Find Cheap Flights from Idaho Falls to Illinois - Compare and Save

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 7/27. 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$291
Moline
Moline1 stop$409
St. Louis
St. Louis1 stop$319
Chicago
Chicago1 stop$291
Moline
Moline1 stop$409
St. Louis
St. Louis1 stop$319

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

Wed, Sep 23 - Sat, Sep 26
United Airlines Logo
4:04 pm - 11:59 pm
IDA
-
ORD
6h 55m
1 stop
United Airlines Logo
5:00 am - 9:53 am
ORD
-
IDA
5h 53m
1 stop
$291United Airlines
Wed, Dec 2 - Sat, Dec 5
Delta Logo
6:45 pm - 8:34 am
IDA
-
ORD
12h 49m
2 stops
Delta Logo
7:30 am - 12:27 pm
ORD
-
IDA
5h 57m
1 stop
$296Delta
Wed, Sep 2 - Sun, Sep 6
American Airlines Logo
1:43 pm - 6:18 pm
IDA
-
ORD
3h 35mnonstop
American Airlines Logo
6:00 am - 1:50 pm
ORD
-
IDA
8h 50m
1 stop
$300American Airlines
Wed, Sep 2 - Sun, Sep 6
American Airlines Logo
1:43 pm - 6:18 pm
IDA
-
ORD
3h 35mnonstop
American Airlines Logo
10:35 am - 1:09 pm
ORD
-
IDA
3h 34mnonstop
$301American Airlines
Wed, Dec 2 - Sat, Dec 5
United Airlines Logo
2:35 pm - 11:19 pm
IDA
-
ORD
7h 44m
1 stop
United Airlines Logo
5:00 am - 9:28 am
ORD
-
IDA
5h 28m
1 stop
$304United Airlines
Tue, Aug 4 - Tue, Sep 1
Delta Logo
6:00 am - 11:59 am
IDA
-
ORD
4h 59m
1 stop
Delta Logo
2:00 pm - 6:20 pm
ORD
-
IDA
5h 20m
1 stop
$310Delta
Fri, Sep 4 - Sat, Sep 5
United Airlines Logo
2:25 pm - 10:00 pm
IDA
-
ORD
6h 35m
1 stop
United Airlines Logo
9:00 am - 11:38 am
ORD
-
IDA
3h 38mnonstop
$314United Airlines
Tue, Aug 4 - Tue, Sep 1
Delta Logo
6:00 am - 11:59 am
IDA
-
ORD
4h 59m
1 stop
Delta Logo
11:22 am - 10:32 pm
ORD
-
IDA
12h 10m
2 stops
$315Delta
Tue, Aug 4 - Sat, Aug 8
Delta Logo
7:00 pm - 12:41 am
IDA
-
STL
4h 41m
1 stop
Delta Logo
5:00 pm - 10:32 pm
STL
-
IDA
6h 32m
1 stop
$319Delta
Mon, Dec 7 - Tue, Dec 8
Alaska Airlines Logo
6:15 am - 2:26 pm
IDA
-
STL
7h 11m
1 stop
Alaska Airlines Logo
3:24 pm - 10:39 pm
STL
-
IDA
8h 15m
1 stop
$344Alaska 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.

How much is a round-trip flight from Idaho Falls to Illinois?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Idaho Falls to Illinois departing in September.

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 5 days was to Chicago, at $348 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 5 days was $348.

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

The average price for all round-trip flights from Idaho Falls to Illinois depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to Illinois is generally in the afternoon, when round-trip flights cost $471 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 $546.

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 $409, prices are generally cheapest when you fly direct.

What is the cheapest month to fly from Idaho Falls to Illinois?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Idaho Falls to Illinois, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Idaho Falls to Illinois is July, when tickets cost $184 (return) on average. On the other hand, the most expensive months are March and April, when the average cost of round-trip tickets is $410 and $384 respectively.

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 Saturday, and avoid Fridays for better deals.

Good to know

Low seasonFebruary
Cheapest flight$131
Best time to beat the crowds but there is an average 16% increase in price.
Most popular time to fly with an average 1% increase in price.
Flight from Idaho Falls to St. Louis

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.

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 $254 one-way - $400 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.
7.8
DeltaOverall score based on 8449 reviews
7.8Comfort
8.1Boarding
8.5Crew
7.8Entertainment
7.2Food
Airline reviews

It was as good as it could be. Flying is not a pleasant experience these days.

8.0 ExcellentMark, Jun 2026
LAX - ORD
Read more Delta reviews

It was as good as it could be. Flying is not a pleasant experience these days.

There was an unruly family behind us that made the short flight miserable!!! The cabin crew did nothing to contain it.

Flight delay was frustrating, also you cannot checkin online without delta app, web browser check-in throw errors

Got on the plane and sat there for an hour before departure.

Very large passenger too space from my own seat. Arm board couldn’t be lowered because of his size. It wads very uncomfortable trip, as the flight was full couldn’t move anywhere having back pain because of the position in which I was the entire flight.

Cramped seating for me. Luckily it wasn’t a long flight

5 hour delay. They blamed the weather but it was the computer issues they had been dealing with for days.

I usually have a positive experience with Delta. Complimentary upgrades are always nice!

The captain was amazing and kept us informed throughout that there would be some rough air. The flight also got delayed but we were able to actually leave on time, which was great.

The staff did not do a good job of getting everyone boarded quickly, so we missed our take off window and had to sit on the tarmac for 20+ min waiting for our turn. The plan was old. Pockets on the back of seats were torn and tearing off. One of the attendants was rude-she would ask a question but he walking away before you finished answering so she kept getting our drink orders wrong.

1 flight cancelled Had to fly out of different city Flight at new departure city was delayed 3 hours causing us to miss connecting flights. By the time we did make it to Prague our luggage did not. Had to wait day and a half for luggage to be delivered. Customer service was not good. Agents did not arrive at gate until 5-10 minutes before boarding

Awful. Delayed flights, missed connection to Toronto. Hotel vouchers were for already booked hotels x3. Giant waste of my time

Boarding was great, and the crew were very friendly. The seats must have been a bit on the older side and you could feel some of the seat components through the padding. Also, the plugs did not work on the row's entertainment screen or charging ports. Checked bag was transferred for connecting flight, and we appreciated how early we had the connecting gate information.

Very easy ! Use the kiosk and bag drop and right to security within 10 min

Over 5 hour delay with minimal updates or ability to standby for alternative flights. During boarding and 1 hr+ wait for takeoff, seats were drenched w water from air conditioning condensation and always leftover crumbs on carpet and seats

Read the fine print. This was my flight home. I booked my flight for the quickest way home. Had a carry-on and a personal item. Same as my outbound flight. Apparently I needed to pre-pay extra for my carry-on. When I checked in, I was told that I had to check it. I said I’ll pay for it, and was told that this wasn’t an option anymore. They said I still had to pay $50 to check my carry-on. I told them I’ll pay whatever to just carry it in as intended. I was not allowed, so eventually I paid $50 to check my carry-on under a plane that was half full, with overhead compartments that were even less full. My white carry-on suitcase was practically destroyed getting from Idaho falls to Denver to Orange County. The low price air fair was a bait and switch. Got me to the gate, made me pay extra, then didn’t even allow me to pay for a carry on. Not to mention that I paid the $8 for WiFi that didn’t work. All to get my suitcase destroyed. I don’t think I’m going to even keep my Untied mileage plus membership and card. Apparently, membership does not have its privileges for this one.

Boarded early, left early, arrived 40 mins early! A win win for me!

These airplanes should be illegal. The seats are two tight, it is a safety issue. Wheelchair support was ridiculously slow. We almost missed our flight.

This flight is a quick way to get to Chicago, but a bit expensive.

Delayed - weather wasn't bad at either end. Also sat on tarmac in ORD.

Flight was delayed…once landed at ORD, no gates were available so made us wait for 56 minutes after we landed to let us out of the aircraft!

The flight de-boarded after being informed of a 3 hour delay. The gate agent said we could go to lounge. The flight ended up boarding 20 minutes later and I missed it.

I love the e fact that the staff communicated swiftly when my flight was delayed and gate number changed

We had a mechanical delay which made us 90 minutes late (9:30 PM) then land and put into the penalty box because a plane was in our gate? What the hell! We should get priority.Damn American.

The seats were extremely cramped, with very little legroom or personal space. There was no room left in the overhead bins for a backpack, and the space under the seat in front was so limited that I could barely fit my bag underneath. Overall, the seating arrangement felt very uncomfortable and overcrowded.

weather delay of almost 2 hours then we landed and our gate wasn't available so we waited another 30 min

Delayed flight more than I hour. When boarding we spent some additional time on the plane before takeoff ....

The flight was delayed significantly and we sat on runway after landing for awhile. Best thing was the flight attendant, Jenny, in first class, who was very professional and attentive. She was excellent - the rest of the flight was not.

The flight attendants were extremely sourly and borderline rude. I did not feel appreciated as an AA customer once.

Flight was delayed due to a steering issue with plane. The delay caused me to miss the connecting flight. The delay caused me to spend an extra 21 hours in airports and flights to get to my destination. The plane issue obviously should have been found and fixed before we even boarded. Ridiculous.

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

Information on your arrival and departure airports