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Cheap flights from Illinois to Idaho Falls from $146

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 5/4. 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
1 adult, Economy, 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.
Alaska Airlines Logo
3:50 pm - 10:52 pm
STL
-
IDA
8h 02m
1 stop
Alaska Airlines Logo
4:06 pm - 11:59 pm
IDA
-
STL
6h 53m
1 stop
$319Alaska Airlines
Tue, Apr 21 - Tue, Apr 28
American Airlines Logo
6:00 am - 1:44 pm
ORD
-
IDA
8h 44m
1 stop
American Airlines Logo
2:20 pm - 11:12 pm
IDA
-
ORD
7h 52m
1 stop
$329American Airlines
Sat, Aug 22 - Sat, Aug 29
Delta Logo
7:45 am - 2:34 pm
ORD
-
IDA
7h 49m
1 stop
Delta Logo
6:54 pm - 8:39 am
IDA
-
ORD
12h 45m
2 stops
$334Delta
Thu, May 7 - Mon, May 11
Delta Logo
6:45 pm - 10:40 pm
STL
-
IDA
4h 55m
1 stop
Delta Logo
6:58 pm - 8:30 am
IDA
-
STL
12h 32m
2 stops
$339Delta
Tue, Apr 21 - Tue, Apr 28
American Airlines Logo
6:00 am - 1:44 pm
ORD
-
IDA
8h 44m
1 stop
American Airlines Logo
12:46 pm - 5:11 pm
IDA
-
ORD
3h 25mnonstop
$349American Airlines
Sat, Aug 22 - Sat, Aug 29
United Airlines Logo
9:00 am - 11:45 am
ORD
-
IDA
3h 45mnonstop
United Airlines Logo
2:30 pm - 9:39 pm
IDA
-
ORD
6h 09m
1 stop
$355United Airlines
Sat, May 30 - Sat, Jun 6
Alaska Airlines Logo
7:20 am - 1:06 pm
ORD
-
IDA
6h 46m
1 stop
Alaska Airlines Logo
4:14 pm - 5:02 am
IDA
-
ORD
11h 48m
1 stop
$359Alaska Airlines
Sat, Aug 8 - Thu, Aug 13
United Airlines Logo
5:00 am - 9:50 am
ORD
-
IDA
5h 50m
1 stop
United Airlines Logo
5:54 pm - 12:44 am
IDA
-
ORD
5h 50m
1 stop
$360United Airlines
Sat, Jul 11 - Fri, Jul 17
United Airlines Logo
1:05 pm - 5:19 pm
ORD
-
IDA
5h 14m
1 stop
United Airlines Logo
10:35 am - 8:05 pm
IDA
-
ORD
8h 30m
1 stop
$361United Airlines
Fri, May 29 - Sat, Jun 6
United Airlines Logo
5:00 am - 9:50 am
ORD
-
IDA
5h 50m
1 stop
United Airlines Logo
5:54 pm - 12:44 am
IDA
-
ORD
5h 50m
1 stop
$367United Airlines
Thu, Jul 23 - Tue, Jul 28

American Airlines flights from Illinois to Idaho Falls

Our best American Airlines deals on Illinois to Idaho Falls flight tickets
American Airlines
Aug 22
ORD6:00 amChicago O'Hare Intl
8h 44m
1 stop
IDA1:44 pmIdaho Falls Fanning Field
Aug 29
IDA2:20 pmIdaho Falls Fanning Field
7h 52m
1 stop
ORD11:12 pmChicago O'Hare Intl
$329
American Airlines
Aug 22
ORD6:00 amChicago O'Hare Intl
8h 44m
1 stop
IDA1:44 pmIdaho Falls Fanning Field
Aug 29
IDA12:46 pmIdaho Falls Fanning Field
3h 25m
ORD5:11 pmChicago O'Hare Intl
$349
American Airlines
May 26
ORD10:56 amChicago O'Hare Intl
3h 42m
IDA1:38 pmIdaho Falls Fanning Field
Jun 3
IDA12:44 pmIdaho Falls Fanning Field
3h 27m
ORD5:11 pmChicago O'Hare Intl
$369

Alaska Airlines flights from Illinois to Idaho Falls

Our best Alaska Airlines deals on Illinois to Idaho Falls flight tickets
Alaska Airlines
Apr 21
STL3:50 pmLambert-St Louis
8h 02m
1 stop
IDA10:52 pmIdaho Falls Fanning Field
Apr 28
IDA4:06 pmIdaho Falls Fanning Field
6h 53m
1 stop
STL11:59 pmLambert-St Louis
$319
Alaska Airlines
Aug 8
ORD7:20 amChicago O'Hare Intl
6h 46m
1 stop
IDA1:06 pmIdaho Falls Fanning Field
Aug 13
IDA4:14 pmIdaho Falls Fanning Field
11h 48m
1 stop
ORD5:02 amChicago O'Hare Intl
$359
Alaska Airlines
May 2
ORD8:00 amChicago O'Hare Intl
8h 29m
1 stop
IDA3:29 pmIdaho Falls Fanning Field
May 6
IDA4:06 pmIdaho Falls Fanning Field
6h 53m
1 stop
ORD11:59 pmChicago O'Hare Intl
$443

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 March 25, 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

Cheapest round-trip

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 4/21

3:50 pm-10:52 pm

1 stop8h 02m

Idaho Falls Fanning Field

Tue 4/28

4:06 pm-11:59 pm

1 stop6h 53m

$319

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Sat 8/22

6:00 am-1:44 pm

1 stop8h 44m

Idaho Falls Fanning Field

Sat 8/29

2:20 pm-11:12 pm

1 stop7h 52m

$329

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Thu 5/7

7:45 am-2:34 pm

1 stop7h 49m

Idaho Falls Fanning Field

Mon 5/11

6:54 pm-8:39 am

2 stops12h 45m

$334

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 4/21

6:45 pm-10:40 pm

1 stop4h 55m

Idaho Falls Fanning Field

Tue 4/28

6:58 pm-8:30 am

2 stops12h 32m

$339

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Sat 8/22

6:00 am-1:44 pm

1 stop8h 44m

Idaho Falls Fanning Field

Sat 8/29

12:46 pm-5:11 pm

Nonstop3h 25m

$349
Quickest round-trip

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Sat 5/30

9:00 am-11:45 am

Nonstop3h 45m

Idaho Falls Fanning Field

Sat 6/6

2:30 pm-9:39 pm

1 stop6h 09m

$355

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Sat 8/8

7:20 am-1:06 pm

1 stop6h 46m

Idaho Falls Fanning Field

Thu 8/13

4:14 pm-5:02 am

1 stop11h 48m

$359

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Sat 7/11

5:00 am-9:50 am

1 stop5h 50m

Idaho Falls Fanning Field

Fri 7/17

5:54 pm-12:44 am

1 stop5h 50m

$360

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Fri 5/29

1:05 pm-5:19 pm

1 stop5h 14m

Idaho Falls Fanning Field

Sat 6/6

10:35 am-8:05 pm

1 stop8h 30m

$361

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Thu 7/23

5:00 am-9:50 am

1 stop5h 50m

Idaho Falls Fanning Field

Tue 7/28

5:54 pm-12:44 am

1 stop5h 50m

$367

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 $441.

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 11% 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

Best Price Found

$390

Fastest flight time

3h 15m

Direct flights

Every day

Airports in Idaho Falls

1 airport
The best flight deal from Illinois to Idaho Falls found on momondo in the last 72 hours is $390
The fastest flight from Illinois to Idaho Falls takes 3h 15m
Direct flights go from Illinois to Idaho Falls every day.
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
7.1
11,494 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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