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

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

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

As of July 2026, 16 flights take off from Illinois and land in Idaho each day. The most common flight departure time for this route is 7:00PM, with 44% of daily flights taking off at noon.

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

As of July 2026, there are 118 flights per week flying from Illinois to Idaho. The most common day of the week flights depart is Mon, with 16% of flights taking off on this day.

What airlines fly to Idaho?

American Airlines, United Airlines and Southwest 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 54% of people opting to fly with this airline when traveling to Idaho. Keep in mind that there are 5 different airlines that fly to Idaho on a routine basis, so you have a few additional options to choose from.

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 6h 21m. Keep in mind that layovers or delays could extend your travel time.

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 July 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.

$119 Cheap Flights from Illinois to Idaho in 2026

Discover deals from 900+ travel sites with momondo.

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.

6:50 am - 2:57 pm

ORD

BOI

9h 07m

1 stop

3:52 pm - 5:42 am

BOI

ORD

12h 50m

1 stop

$254Frontier

Mon, Sep 21 - Mon, Sep 28

6:50 am - 2:57 pm

ORD

BOI

9h 07m

1 stop

3:52 pm - 5:42 am

BOI

ORD

12h 50m

1 stop

$276Frontier

Fri, Sep 11 - Sun, Sep 13

7:45 am - 12:15 pm

ORD

IDA

5h 30m

1 stop

1:05 pm - 9:52 pm

IDA

ORD

7h 47m

1 stop

$291Delta

Sat, Sep 19 - Tue, Sep 22

6:00 am - 2:35 pm

ORD

IDA

9h 35m

2 stops

6:00 am - 11:59 am

IDA

ORD

4h 59m

1 stop

$296Delta

Tue, Aug 18 - Tue, Aug 25

11:30 am - 1:37 pm

ORD

GEG

4h 07mnonstop

2:27 pm - 8:28 pm

GEG

ORD

4h 01mnonstop

$297American Airlines

Sat, Aug 15 - Sat, Aug 22

8:50 pm - 10:40 pm

MDW

GEG

3h 50mnonstop

6:00 am - 11:30 am

GEG

MDW

3h 30mnonstop

$297Southwest

Mon, Aug 17 - Mon, Aug 24

1:50 pm - 8:42 pm

ORD

GEG

8h 52m

1 stop

2:27 pm - 8:28 pm

GEG

ORD

4h 01mnonstop

$307American Airlines

Wed, Aug 12 - Sat, Aug 22

8:40 am - 11:28 am

ORD

BOI

3h 48mnonstop

12:24 pm - 5:03 pm

BOI

ORD

3h 39mnonstop

$307United Airlines

Mon, Aug 17 - Thu, Aug 20

11:40 am - 2:10 pm

MDW

BOI

3h 30mnonstop

12:10 pm - 4:30 pm

BOI

MDW

3h 20mnonstop

$307Southwest

Mon, Aug 17 - Thu, Aug 20

8:40 am - 11:28 am

ORD

BOI

3h 48mnonstop

5:44 pm - 11:59 pm

BOI

ORD

5h 15m

1 stop

$317United Airlines

Sat, Aug 15 - Mon, Aug 17

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Frontier flights from Illinois to Idaho

Our best Frontier deals on Illinois to Idaho flight tickets

Frontier

Sep 21

ORD6:50 amChicago O'Hare Intl

9h 07m

1 stop

BOI2:57 pmBoise Air Term. Gowen Fld

Sep 28

BOI3:52 pmBoise Air Term. Gowen Fld

12h 50m

1 stop

ORD5:42 amChicago O'Hare Intl

$254

Frontier

Sep 11

ORD6:50 amChicago O'Hare Intl

9h 07m

1 stop

BOI2:57 pmBoise Air Term. Gowen Fld

Sep 13

BOI3:52 pmBoise Air Term. Gowen Fld

12h 50m

1 stop

ORD5:42 amChicago O'Hare Intl

$276

Frontier

Oct 5

ORD10:40 pmChicago O'Hare Intl

14h 24m

1 stop

BOI12:04 pmBoise Air Term. Gowen Fld

Oct 9

BOI3:52 pmBoise Air Term. Gowen Fld

12h 50m

1 stop

ORD5:42 amChicago O'Hare Intl

$287

Alaska Airlines flights from Illinois to Idaho

Our best Alaska Airlines deals on Illinois to Idaho flight tickets

Alaska Airlines

Aug 29

ORD6:00 amChicago O'Hare Intl

7h 36m

1 stop

BOI12:36 pmBoise Air Term. Gowen Fld

Sep 5

BOI2:17 pmBoise Air Term. Gowen Fld

8h 42m

1 stop

ORD11:59 pmChicago O'Hare Intl

$301

Alaska Airlines

Sep 2

ORD6:00 amChicago O'Hare Intl

7h 03m

1 stop

GEG11:03 amSpokane

Sep 6

GEG7:03 amSpokane

10h 18m

1 stop

ORD7:21 pmChicago O'Hare Intl

$308

Alaska Airlines

Aug 19

ORD6:00 amChicago O'Hare Intl

7h 36m

1 stop

BOI12:36 pmBoise Air Term. Gowen Fld

Aug 25

BOI7:20 amBoise Air Term. Gowen Fld

11h 01m

1 stop

ORD7:21 pmChicago O'Hare Intl

$315

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Mon 9/21

6:50 am-2:57 pm

1 stop9h 07m

Boise Air Term. Gowen Fld

Mon 9/28

3:52 pm-5:42 am

1 stop12h 50m

$254

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Fri 9/11

6:50 am-2:57 pm

1 stop9h 07m

Boise Air Term. Gowen Fld

Sun 9/13

3:52 pm-5:42 am

1 stop12h 50m

$276

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Sat 9/19

7:45 am-12:15 pm

1 stop5h 30m

Idaho Falls Fanning Field

Tue 9/22

1:05 pm-9:52 pm

1 stop7h 47m

$291

ChicagoIdaho Falls

ORD - IDA

ORDIDA

Chicago O'Hare Intl

Tue 8/18

6:00 am-2:35 pm

2 stops9h 35m

Idaho Falls Fanning Field

Tue 8/25

6:00 am-11:59 am

1 stop4h 59m

$296

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Sat 8/15

11:30 am-1:37 pm

Nonstop4h 07m

Spokane

Sat 8/22

2:27 pm-8:28 pm

Nonstop4h 01m

$297

ChicagoSpokane

MDW - GEG

MDWGEG

Chicago Midway

Mon 8/17

8:50 pm-10:40 pm

Nonstop3h 50m

Spokane

Mon 8/24

6:00 am-11:30 am

Nonstop3h 30m

$297

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Wed 8/12

1:50 pm-8:42 pm

1 stop8h 52m

Spokane

Sat 8/22

2:27 pm-8:28 pm

Nonstop4h 01m

$307

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Mon 8/17

8:40 am-11:28 am

Nonstop3h 48m

Boise Air Term. Gowen Fld

Thu 8/20

12:24 pm-5:03 pm

Nonstop3h 39m

$307

Quickest round-trip

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Mon 8/17

11:40 am-2:10 pm

Nonstop3h 30m

Boise Air Term. Gowen Fld

Thu 8/20

12:10 pm-4:30 pm

Nonstop3h 20m

$307

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Sat 8/15

8:40 am-11:28 am

Nonstop3h 48m

Boise Air Term. Gowen Fld

Mon 8/17

5:44 pm-11:59 pm

1 stop5h 15m

$317

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, February 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 $323. If you don’t want to visit Idaho in February, then you should wait until October to fly from Illinois, when ticket prices are also cheap, with an average price of $332.

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 $345. On the other hand, Sunday 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 $587.

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 $393. 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 $564 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 $448 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 $320 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	$225
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 $225. The best round-trip flight deal from Illinois to Idaho found on momondo in the last 72 hours is $346.

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 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 July 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) (30.70% of total bookings). The next most popular plane models are Boeing 737-800 (26.54%), Airbus A319 (15.49%), and Boeing 737 MAX 9 (7.03%).

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
United Airlines	PriceFrom $263	Free Cancellation	Rating 7.4 10,014 reviews	Search United Airlines flights
American Airlines	PriceFrom $268	Free Cancellation	Rating 7.1 11,836 reviews	Search American Airlines flights
Delta	PriceFrom $268	Free Cancellation	Rating 7.8 8,472 reviews	Search Delta flights
Southwest	PriceFrom $288	Free Cancellation	Rating 8.0 4,238 reviews	Search Southwest flights
Alaska Airlines	PriceFrom $348	Free Cancellation	Rating 7.9 12,685 reviews	Search Alaska Airlines 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.

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Popular cities in Idaho

Flights to New Yorkfrom $73

Flights to Los Angelesfrom $56

Flights to Orlandofrom $57

Flights to Miamifrom $69

Flights to Chicagofrom $76

Flights to San Franciscofrom $55

Flights to Las Vegasfrom $46

Flights to Washington, D.C.from $56

Flights to Bostonfrom $110

Flights to Atlantafrom $56

Flights to Fort Lauderdalefrom $58

Flights to Dallasfrom $77

Cheap flights from Illinois to Idaho from $119

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 9/14. 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

Alaska Airlines flights from Illinois to Idaho

Our best Alaska Airlines deals on Illinois to Idaho flight tickets

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Use the filters below to find and compare flights from Illinois to Idaho that are best for you.

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

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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