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Cheap flights from Illinois to Idaho Falls from $135

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Idaho Falls departing on 3/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Illinois to Idaho Falls

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
7:00 am - 1:30 pm
ORD
-
IDA
7h 30m
1 stop
United Airlines Logo
5:30 pm - 11:53 pm
IDA
-
ORD
5h 23m
1 stop
$269United Airlines
Thu, Mar 12 - Mon, Mar 16
American Airlines Logo
6:04 am - 1:13 pm
ORD
-
IDA
8h 09m
1 stop
American Airlines Logo
1:43 pm - 10:45 pm
IDA
-
ORD
8h 02m
1 stop
$274American Airlines
Fri, Apr 17 - Wed, Apr 22
United Airlines Logo
8:41 am - 1:30 pm
STL
-
IDA
5h 49m
1 stop
United Airlines Logo
5:30 pm - 11:34 pm
IDA
-
STL
5h 04m
1 stop
$279United Airlines
Tue, Mar 3 - Tue, Mar 10
United Airlines Logo
6:25 am - 1:30 pm
STL
-
IDA
8h 05m
2 stops
United Airlines Logo
5:30 pm - 11:34 pm
IDA
-
STL
5h 04m
1 stop
$284United Airlines
Tue, Mar 3 - Tue, Mar 10
Alaska Airlines Logo
7:00 am - 4:43 pm
STL
-
IDA
10h 43m
1 stop
Alaska Airlines Logo
5:20 pm - 1:51 pm
IDA
-
STL
19h 31m
1 stop
$287Alaska Airlines
Wed, Mar 4 - Tue, Mar 10
Delta Logo
7:45 am - 2:34 pm
ORD
-
IDA
7h 49m
1 stop
Delta Logo
3:16 pm - 9:50 pm
IDA
-
ORD
5h 34m
1 stop
$294Delta
Fri, May 8 - Mon, May 11
Delta Logo
1:20 pm - 5:49 pm
ORD
-
IDA
5h 29m
1 stop
Delta Logo
6:55 pm - 8:30 am
IDA
-
ORD
12h 35m
2 stops
$299Delta
Fri, Mar 6 - Mon, Mar 9
Alaska Airlines Logo
3:54 pm - 11:36 pm
ORD
-
IDA
8h 42m
1 stop
Alaska Airlines Logo
5:20 pm - 2:13 pm
IDA
-
ORD
19h 53m
1 stop
$303Alaska Airlines
Fri, Mar 6 - Mon, Mar 9
Alaska Airlines Logo
7:40 am - 11:36 pm
ORD
-
IDA
16h 56m
2 stops
Alaska Airlines Logo
5:20 pm - 2:11 pm
IDA
-
ORD
19h 51m
1 stop
$311Alaska Airlines
Wed, Mar 11 - Mon, Mar 16
Allegiant Air Logo
12:16 pm - 3:30 pm
MLI
-
IDA
28h 14m
1 stop
Allegiant Air Logo
7:12 pm - 7:38 pm
IDA
-
MLI
23h 26m
1 stop
$630Allegiant Air
Thu, Feb 26 - Sun, Mar 1

United Airlines flights from Illinois to Idaho Falls

Our best United Airlines deals on Illinois to Idaho Falls flight tickets
United Airlines
Mar 3
STL8:41 amLambert-St Louis
5h 49m
1 stop
IDA1:30 pmIdaho Falls Fanning Field
Mar 10
IDA5:30 pmIdaho Falls Fanning Field
5h 04m
1 stop
STL11:34 pmLambert-St Louis
$279
United Airlines
Mar 3
STL6:25 amLambert-St Louis
8h 05m
2 stops
IDA1:30 pmIdaho Falls Fanning Field
Mar 10
IDA5:30 pmIdaho Falls Fanning Field
5h 04m
1 stop
STL11:34 pmLambert-St Louis
$284
United Airlines
Feb 17
ORD2:02 pmChicago O'Hare Intl
7h 56m
1 stop
IDA8:58 pmIdaho Falls Fanning Field
Feb 21
IDA5:33 pmIdaho Falls Fanning Field
5h 26m
1 stop
ORD11:59 pmChicago O'Hare Intl
$329

Delta flights from Illinois to Idaho Falls

Our best Delta deals on Illinois to Idaho Falls flight tickets
Delta
May 8
ORD7:45 amChicago O'Hare Intl
7h 49m
1 stop
IDA2:34 pmIdaho Falls Fanning Field
May 11
IDA3:16 pmIdaho Falls Fanning Field
5h 34m
1 stop
ORD9:50 pmChicago O'Hare Intl
$294
Delta
Mar 6
ORD1:20 pmChicago O'Hare Intl
5h 29m
1 stop
IDA5:49 pmIdaho Falls Fanning Field
Mar 9
IDA6:55 pmIdaho Falls Fanning Field
12h 35m
2 stops
ORD8:30 amChicago O'Hare Intl
$299
Delta
Feb 18
ORD2:05 pmChicago O'Hare Intl
9h 16m
2 stops
IDA10:21 pmIdaho Falls Fanning Field
Feb 22
IDA5:25 amIdaho Falls Fanning Field
5h 54m
1 stop
ORD12:19 pmChicago O'Hare Intl
$334

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to Idaho Falls that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated February 3, 2026.
Use the filters below to find and compare flights from Illinois to Idaho Falls that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Thu 3/12

7:00 am-1:30 pm

1 stop7h 30m

Idaho Falls Fanning Field

Mon 3/16

5:30 pm-11:53 pm

1 stop5h 23m

$269

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Fri 4/17

6:04 am-1:13 pm

1 stop8h 09m

Idaho Falls Fanning Field

Wed 4/22

1:43 pm-10:45 pm

1 stop8h 02m

$274

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 3/3

8:41 am-1:30 pm

1 stop5h 49m

Idaho Falls Fanning Field

Tue 3/10

5:30 pm-11:34 pm

1 stop5h 04m

$279

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 3/3

6:25 am-1:30 pm

2 stops8h 05m

Idaho Falls Fanning Field

Tue 3/10

5:30 pm-11:34 pm

1 stop5h 04m

$284

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Wed 3/4

7:00 am-4:43 pm

1 stop10h 43m

Idaho Falls Fanning Field

Tue 3/10

5:20 pm-1:51 pm

1 stop19h 31m

$287

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Fri 5/8

7:45 am-2:34 pm

1 stop7h 49m

Idaho Falls Fanning Field

Mon 5/11

3:16 pm-9:50 pm

1 stop5h 34m

$294

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Fri 3/6

1:20 pm-5:49 pm

1 stop5h 29m

Idaho Falls Fanning Field

Mon 3/9

6:55 pm-8:30 am

2 stops12h 35m

$299

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Fri 3/6

3:54 pm-11:36 pm

1 stop8h 42m

Idaho Falls Fanning Field

Mon 3/9

5:20 pm-2:13 pm

1 stop19h 53m

$303

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Wed 3/11

7:40 am-11:36 pm

2 stops16h 56m

Idaho Falls Fanning Field

Mon 3/16

5:20 pm-2:11 pm

1 stop19h 51m

$311

MolineIdaho Falls

MLI - IDA

MLIIDA

Moline Quad-City

Thu 2/26

12:16 pm-3:30 pm

1 stop28h 14m

Idaho Falls Fanning Field

Sun 3/1

7:12 pm-7:38 pm

1 stop23h 26m

$630

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Idaho Falls from

How to get the cheapest flight ticket from Illinois to Idaho Falls

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 day to depart on your flight to Idaho Falls?

Our data shows that Friday is the least expensive day to fly to Idaho Falls. Tickets to fly out on this day can be as low as $323. Be sure to avoid booking your departure on a Wednesday as prices are generally higher than usual. According to our data, the average ticket price to Idaho Falls on Wednesday is $396.

What is the cheapest Illinois to Idaho Falls Fanning Field flight route?

Fly from Chicago O'Hare Intl to Idaho Falls Fanning Field for the best Illinois - Idaho Falls Fanning Field flight prices

What cabin class options are available on Illinois to Idaho Falls Fanning Field flights?

There are 2 cabin classes available to choose from on Illinois to Idaho Falls Fanning Field 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 Illinois to Idaho Falls flights?

You could potentially save up to 39% on your flight if you consider stops on a Illinois to Idaho Falls flight.

Cheap Illinois to Idaho Falls flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Idaho Falls

Fastest flight time

3h 15m

Direct flights

Mon, Wed, Thu and Sat

Airports in Idaho Falls

1 airport
The fastest flight from Illinois to Idaho Falls takes 3h 15m
Direct flights go from Illinois to Idaho Falls on Monday, Wednesday, Thursday and Saturday. There are no airlines offering direct flights.
There is 1 airport in Idaho Falls. From Illinois there are direct flights to Idaho Falls Fanning Field (IDA).
Search flight deals

  • When did momondo last update prices for flights from Illinois to Idaho Falls Fanning Field Airport?

    Prices for flights from Illinois to Idaho Falls Fanning Field Airport were last updated today.

  • How many operators does momondo search for flights from Illinois to Idaho Falls Fanning Field Airport?

  • How old do you have to be to fly from Illinois to Idaho Falls Fanning Field Airport?

    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 Illinois to Idaho Falls Fanning Field Airport.

  • What documentation or ID do you need to fly to Idaho Falls Fanning Field Airport?

    The travel and health documents required for your trip to Idaho Falls Fanning Field Airport 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 Idaho Falls Fanning Field Airport. 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 Illinois to Idaho Falls?

Best airlines flying from Illinois to Idaho Falls

Compare and see reviews for airlines that fly from Illinois to Idaho Falls with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $323Free CancellationRating
7.2
11,216 reviews
Search American Airlines flights

Traveling to a place near Idaho Falls?

Book flights to Idaho Falls if you plan to visit one of these locations
Rexburg

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Idaho Falls?

Finding the right flight to Idaho Falls from Illinois is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Idaho Falls quick and easy, saving you time and money.

Can I find flights from Illinois to Idaho Falls with flexible booking policies on momondo?

Yes. All flights to Idaho Falls from Illinois on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Illinois to Idaho Falls?

momondo provides multiple filters to help you find the best flight to Idaho Falls from Illinois. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Illinois to Idaho Falls right now. Can momondo alert me if prices change?

Price alerts on flights to Idaho Falls from Illinois 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.

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