What is the cheapest airline that flies from Illinois to Idaho?

Delta, Alaska Airlines, and Frontier are the most popular carriers operating from Illinois to Idaho

How many flights depart from Illinois to Idaho on average per day?

As of June 2026, 12 flights take off from Illinois and land in Idaho each day. The most common flight departure time for this route is 7:00PM, with 50% of daily flights taking off in the evening.

How long is the flight from Illinois to Idaho?

Flight times from Illinois to Idaho vary, but if you’re flying out of Chicago and flying into Boise (one of the most popular routes), then the duration is 3h 38m on average. Another popular route from Illinois to Idaho is flying from Peoria to Boise, which will take roughly 5h 53m. Keep in mind that layovers or delays could extend your travel time.

How many flights depart from Illinois to Idaho on average per week?

As of June 2026, there are 85 flights per week flying from Illinois to Idaho. The most common day of the week flights depart is Wed, with 20% of flights taking off on this day.

What airlines fly to Idaho?

American Airlines, United Airlines and Delta are the top three most popular airlines that fly to Idaho from Illinois according to our data. American Airlines is the first choice among our users, with 49% of people opting to fly with this airline when traveling to Idaho. Keep in mind that there are 4 different airlines that fly to Idaho on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Illinois to Idaho?

Prices for flights from Illinois to Idaho were last updated today.

How many operators does momondo search for flights from Illinois to Idaho?

As of June 2026, there are 5 operators available to choose from for flights from Illinois to Idaho.

How old do you have to be to fly from Illinois to Idaho?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Idaho.

What documentation or ID do you need to fly to Idaho?

The travel and health documents you'll need for your trip to Idaho may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Idaho. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$110 Cheap Flights from Illinois to Idaho in 2026

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Find the cheapest flights from Illinois to Idaho

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:59 pm - 10:35 pm

STL

GEG

5h 36m

1 stop

5:20 pm - 12:34 am

GEG

STL

5h 14m

1 stop

$249Delta

mar., sep. 8 - mar., sep. 15

9:40 am - 12:20 pm

ORD

IDA

3h 40mnonstop

1:43 pm - 6:00 pm

IDA

ORD

3h 17mnonstop

$271American Airlines

mié., oct. 7 - mié., oct. 14

6:25 am - 12:57 pm

ORD

GEG

8h 32m

1 stop

6:00 am - 3:51 pm

GEG

ORD

7h 51m

1 stop

$279Delta

sáb., ago. 22 - sáb., ago. 29

3:34 pm - 8:25 pm

STL

GEG

6h 51m

1 stop

6:30 am - 6:04 pm

GEG

STL

9h 34m

2 stops

$290American Airlines

jue., sep. 10 - mar., sep. 15

6:42 pm - 11:59 pm

ORD

GEG

7h 17m

1 stop

7:41 pm - 5:00 am

GEG

ORD

7h 19m

1 stop

$303Alaska Airlines

mar., jul. 7 - mar., jul. 14

6:00 am - 12:31 pm

ORD

GEG

8h 31m

1 stop

3:44 pm - 11:59 pm

GEG

ORD

6h 15m

1 stop

$309Alaska Airlines

sáb., sep. 5 - sáb., sep. 5

5:00 am - 9:50 am

ORD

IDA

5h 50m

1 stop

5:54 pm - 12:44 am

IDA

ORD

5h 50m

1 stop

$317United Airlines

sáb., ago. 1 - sáb., ago. 8

5:00 am - 9:50 am

ORD

IDA

5h 50m

1 stop

5:54 pm - 12:44 am

IDA

ORD

5h 50m

1 stop

$318United Airlines

sáb., ago. 1 - sáb., ago. 8

2:55 pm - 8:50 pm

MDW

BOI

6h 55m

1 stop

1:05 pm - 11:00 pm

BOI

MDW

8h 55m

2 stops

$340Southwest

mar., jul. 7 - mar., jul. 14

2:55 pm - 8:50 pm

MDW

BOI

6h 55m

1 stop

7:10 am - 11:30 am

BOI

MDW

3h 20mnonstop

$355Southwest

mar., jul. 7 - mar., jul. 14

Frontier flights from Illinois to Idaho

Our best Frontier deals on Illinois to Idaho flight tickets

Frontier

Jul 1

STL8:08 pmLambert-St Louis

17h 22m

1 stop

BOI12:30 pmBoise Air Term. Gowen Fld

Jul 7

BOI1:24 pmBoise Air Term. Gowen Fld

4h 59m

1 stop

STL7:23 pmLambert-St Louis

$320

Frontier

Sep 28

STL8:10 pmLambert-St Louis

16h 54m

1 stop

BOI12:04 pmBoise Air Term. Gowen Fld

Oct 1

BOI12:59 pmBoise Air Term. Gowen Fld

5h 16m

1 stop

STL7:15 pmLambert-St Louis

$334

Frontier

Jun 22

ORD9:48 pmChicago O'Hare Intl

15h 42m

1 stop

BOI12:30 pmBoise Air Term. Gowen Fld

Jun 25

BOI1:25 pmBoise Air Term. Gowen Fld

6h 18m

1 stop

ORD8:43 pmChicago O'Hare Intl

$339

American Airlines flights from Illinois to Idaho

Our best American Airlines deals on Illinois to Idaho flight tickets

American Airlines

Oct 7

ORD9:40 amChicago O'Hare Intl

3h 40m

IDA12:20 pmIdaho Falls Fanning Field

Oct 14

IDA1:43 pmIdaho Falls Fanning Field

3h 17m

ORD6:00 pmChicago O'Hare Intl

$271

American Airlines

Sep 10

STL3:34 pmLambert-St Louis

6h 51m

1 stop

GEG8:25 pmSpokane

Sep 15

GEG6:30 amSpokane

9h 34m

2 stops

STL6:04 pmLambert-St Louis

$290

American Airlines

Aug 20

STL8:00 amLambert-St Louis

6h 24m

1 stop

BOI1:24 pmBoise Air Term. Gowen Fld

Aug 25

BOI1:55 pmBoise Air Term. Gowen Fld

9h 19m

2 stops

STL12:14 amLambert-St Louis

$308

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

mar. 9/8

6:59 pm-10:35 pm

1 stop5h 36m

Spokane

mar. 9/15

5:20 pm-12:34 am

1 stop5h 14m

$249

Quickest round-trip

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

mié. 10/7

9:40 am-12:20 pm

Nonstop3h 40m

Idaho Falls Fanning Field

mié. 10/14

1:43 pm-6:00 pm

Nonstop3h 17m

$271

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

sáb. 8/22

6:25 am-12:57 pm

1 stop8h 32m

Spokane

sáb. 8/29

6:00 am-3:51 pm

1 stop7h 51m

$279

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

jue. 9/10

3:34 pm-8:25 pm

1 stop6h 51m

Spokane

mar. 9/15

6:30 am-6:04 pm

2 stops9h 34m

$290

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

mar. 7/7

6:42 pm-11:59 pm

1 stop7h 17m

Spokane

mar. 7/14

7:41 pm-5:00 am

1 stop7h 19m

$303

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

sáb. 9/5

6:00 am-12:31 pm

1 stop8h 31m

Spokane

sáb. 9/5

3:44 pm-11:59 pm

1 stop6h 15m

$309

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

sáb. 8/1

5:00 am-9:50 am

1 stop5h 50m

Idaho Falls Fanning Field

sáb. 8/8

5:54 pm-12:44 am

1 stop5h 50m

$317

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

sáb. 8/1

5:00 am-9:50 am

1 stop5h 50m

Idaho Falls Fanning Field

sáb. 8/8

5:54 pm-12:44 am

1 stop5h 50m

$318

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

mar. 7/7

2:55 pm-8:50 pm

1 stop6h 55m

Boise Air Term. Gowen Fld

mar. 7/14

1:05 pm-11:00 pm

2 stops8h 55m

$340

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

mar. 7/7

2:55 pm-8:50 pm

1 stop6h 55m

Boise Air Term. Gowen Fld

mar. 7/14

7:10 am-11:30 am

Nonstop3h 20m

$355

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Illinois to Idaho

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

Prices

Airlines

Other information

What is the cheapest month to fly to Idaho?

In general, July is the cheapest month to fly from Illinois to Idaho. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $91. If you don’t want to visit Idaho in July, then you should wait until August to fly from Illinois, when ticket prices are also cheap, with an average price of $114.

What is the cheapest day to depart on your flight to Idaho?

Our data shows that Wednesday is the least expensive day to fly to Idaho. Tickets to fly out on this day can be as low as $363. On the other hand, Monday is the most expensive day to depart from Illinois because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $548.

What is the cheapest time of day to depart on your flight to Idaho?

According to our data, the cheapest time of day to fly to Idaho is in the morning. momondo users have found flights departing from Illinois to Idaho in the morning for as low as $400. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In the evening is when there is more demand to fly to Idaho, so prices are often more expensive at around $497 per ticket.

What is the cheapest Illinois to Idaho flight route?

Fly from Chicago O'Hare Intl to Boise Air Term. Gowen Fld for the best Illinois - Idaho flight prices

How far in advance should I book a flight from Illinois to Idaho?

You are more likely to see cheaper flights to Idaho from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Idaho for around $437 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Idaho from Illinois for as low as $302 on momondo.

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

There are 4 cabin classes available to choose from on Illinois to Idaho 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 flights?

No. A direct flight is the cheapest option for a flight between Illinois to Idaho.

Cheap Illinois to Idaho flight deals and tips

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

Best Price Found	$242
Fastest flight time	3h 17m
Direct flights	Every day
Airports in Idaho	27 airports

The best one-way flight to Idaho from Illinois in the past 72 hours is $242. The best round-trip flight deal from Illinois to Idaho found on momondo in the last 72 hours is $380.

The fastest flight from Illinois to Idaho takes 3h 17m

Direct flights go from Illinois to Idaho every day.

There are 27 airports in Idaho. From Illinois there are direct flights to Idaho Falls Fanning Field (IDA), Jackson Hole (JAC), Boise Air Term. Gowen Fld (BOI).

Search flight deals

Frequently asked questions about flying from Illinois to Idaho

When did momondo last update prices for flights from Illinois to Idaho?
Prices for flights from Illinois to Idaho were last updated today.
How many operators does momondo search for flights from Illinois to Idaho?
As of June 2026, there are 5 operators available to choose from for flights from Illinois to Idaho.
How old do you have to be to fly from Illinois to Idaho?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Idaho.
What documentation or ID do you need to fly to Idaho?
The travel and health documents you'll need for your trip to Idaho may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Idaho. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Illinois to Idaho?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Illinois to Idaho is Embraer 175 (Enhanced Winglets) (30.61% of total bookings). The next most popular plane models are Boeing 737-800 (19.83%), Airbus A319 (17.35%), and Boeing 737 MAX 9 (11.22%).

Best airlines flying from Illinois to Idaho

Compare and see reviews for airlines that fly from Illinois to Idaho with momondo

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $236	Free Cancellation	Rating 7.9 8,398 reviews	Search Delta flights
United Airlines	PriceFrom $263	Free Cancellation	Rating 7.4 9,771 reviews	Search United Airlines flights
American Airlines	PriceFrom $268	Free Cancellation	Rating 7.1 11,642 reviews	Search American Airlines flights
Southwest	PriceFrom $285	Free Cancellation	Rating 8.0 4,255 reviews	Search Southwest flights

Why use momondo?

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

It is quick and easy to find Illinois to Idaho flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Idaho that suits you.

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

Flights from Illinois to Idaho with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

momondo provides multiple filters to help you find the best flight to Idaho 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 right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Illinois to Idaho flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Idaho trip

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Popular cities

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Popular cities in Idaho

Flights to New Yorkfrom $60

Flights to Los Angelesfrom $77

Flights to Orlandofrom $68

Flights to Miamifrom $78

Flights to Chicagofrom $64

Flights to San Franciscofrom $66

Flights to Las Vegasfrom $66

Flights to Washington, D.C.from $50

Flights to Bostonfrom $79

Flights to Atlantafrom $50

Flights to Fort Lauderdalefrom $59

Flights to Dallasfrom $63

Cheap flights from Illinois to Idaho from $110

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 departing on 8/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Frontier flights from Illinois to Idaho

Our best Frontier deals on Illinois to Idaho flight tickets

American Airlines flights from Illinois to Idaho

Our best American Airlines deals on Illinois to Idaho flight tickets

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See travel insights to Idaho from

How to get the cheapest flight ticket from Illinois to Idaho

What is the cheapest month to fly to Idaho?

What is the cheapest day to depart on your flight to Idaho?

What is the cheapest time of day to depart on your flight to Idaho?

What is the cheapest Illinois to Idaho flight route?

How far in advance should I book a flight from Illinois to Idaho?

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

Can stopping save me money on Illinois to Idaho flights?

What is the cheapest airline that flies from Illinois to Idaho?

What airlines fly to Idaho?

How many flights depart from Illinois to Idaho on average per day?

How many flights depart from Illinois to Idaho on average per week?

How long is the flight from Illinois to Idaho?

Cheap Illinois to Idaho flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in Idaho

Frequently asked questions about flying from Illinois to Idaho

Best airlines flying from Illinois to Idaho

Compare and see reviews for airlines that fly from Illinois to Idaho with momondo

Why use momondo?

An easier way to manage your Idaho trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Idaho

Popular cities in Idaho

Popular flights according to clicks in the last 7 days on momondo

Illinois flight routes

According to popular flight searches on momondo this year

Idaho flight routes

According to popular flight searches on momondo this year

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Airlines are sorted and displayed according to clicks in the past 7 days on momondo

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