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$72+ Cheap flights from Illinois to Idaho

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from Illinois to Idaho

Keep the following information in mind while searching for Illinois to Idaho flight deals. Data was last updated September 11, 2025.

Round-trip from

$157
(Delta)

One-way from

$72
(Southwest)

Popular in

November

Cheapest in

September

Average price

$322

Good round-trip deal

$269 or less

Good one-way deal

$147 or less
From Illinois to Idaho
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One-way flight from Illinois to Idaho
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Highest demand for flights based on searches. 12% potential increase in price ($56 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Illinois to Idaho.
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Price to beat on a one-way flight from Illinois to Idaho.
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Find flight deals from Illinois to Idaho

Cheapest flights from Illinois to Idaho
Explore the most affordable flight options available from Illinois to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Southwest deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/125:25 amMDW - BOI
1 stop9h 40mSouthwest
Sat 11/155:00 amBOI - MDW
1 stop5h 45mSouthwest
Deal found 9/10$160
This American Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2210:30 amORD - GEG
Nonstop3h 50mAmerican Airlines
Tue 10/281:12 pmGEG - ORD
Nonstop3h 52mAmerican Airlines
Deal found 9/10$163
This Kiwi.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/25:35 amORD - BOI
1 stop7h 02mMultiple Airlines
Fri 10/39:26 pmBOI - ORD
1 stop13h 25mMultiple Airlines
Deal found 9/10$166
This Delta deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/17:10 amORD - BOI
1 stop9h 30mDelta
Tue 10/75:25 amBOI - ORD
1 stop7h 05mDelta
Deal found 9/11$167
This Delta deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/128:50 amORD - BOI
1 stop6h 14mDelta
Sat 11/1511:13 amBOI - ORD
2 stops9h 23mDelta
Deal found 9/10$172
This Delta deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/86:05 pmORD - GEG
1 stop7h 54mDelta
Wed 10/153:37 pmGEG - ORD
1 stop6h 13mDelta
Deal found 9/10$177
This Alaska Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/143:25 pmORD - BOI
1 stop7h 55mAlaska Airlines
Sun 11/166:05 pmBOI - ORD
1 stop11h 17mAlaska Airlines
Deal found 9/11$178
This United Airlines deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/34:05 pmORD - BOI
Nonstop3h 42mUnited Airlines
Sun 10/53:10 pmBOI - ORD
Nonstop3h 30mUnited Airlines
Deal found 9/9$179
This American Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/210:46 amORD - GEG
Nonstop3h 58mAmerican Airlines
Sat 10/41:30 pmGEG - ORD
Nonstop3h 48mAmerican Airlines
Deal found 9/10$179
This Southwest deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/257:00 amORD - BOI
1 stop8h 05mSouthwest
Wed 10/294:15 pmBOI - ORD
1 stop5h 50mSouthwest
Deal found 9/9$180
This Delta deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/226:05 pmORD - GEG
1 stop7h 54mDelta
Tue 10/2812:51 pmGEG - ORD
1 stop9h 07mDelta
Deal found 9/11$183
This Delta deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/246:08 amORD - BOI
2 stops10h 58mDelta
Mon 10/272:00 pmBOI - ORD
1 stop8h 50mDelta
Deal found 9/11$184

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Idaho 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, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from Illinois to Idaho that are best for you.

Fly from

Illinois

Fly to

Idaho

Route

Depart

Return

Price

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Tue 3/3

9:20 am-10:05 pm

2 stops13h 45m

Boise Air Term. Gowen Fld

Wed 3/4

5:40 am-1:08 pm

1 stop6h 28m

$162

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Fri 10/3

4:05 pm-6:47 pm

Nonstop3h 42m

Boise Air Term. Gowen Fld

Sun 10/5

3:10 pm-7:40 pm

Nonstop3h 30m

$179

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Fri 10/24

2:25 pm-10:06 pm

1 stop8h 41m

Boise Air Term. Gowen Fld

Mon 10/27

2:00 pm-11:50 pm

1 stop8h 50m

$179

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Sat 10/25

7:00 am-2:05 pm

1 stop8h 05m

Boise Air Term. Gowen Fld

Wed 10/29

4:15 pm-11:05 pm

1 stop5h 50m

$180

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Sat 11/15

7:47 am-2:54 pm

1 stop9h 07m

Spokane

Mon 11/17

1:16 pm-12:02 am

1 stop8h 46m

$183

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Mon 11/17

7:47 am-12:43 pm

1 stop6h 56m

Spokane

Wed 12/3

1:15 pm-9:24 pm

1 stop6h 09m

$183

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Thu 11/13

6:35 pm-12:35 am

1 stop7h 00m

Boise Air Term. Gowen Fld

Tue 11/18

3:45 pm-10:55 pm

1 stop6h 10m

$187

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Thu 11/6

7:37 am-2:57 pm

1 stop9h 20m

Spokane

Mon 11/10

6:05 am-5:18 pm

1 stop9h 13m

$189

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Thu 11/6

5:53 pm-12:22 am

1 stop8h 29m

Spokane

Mon 11/10

8:59 pm-6:22 am

1 stop7h 23m

$194

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Wed 10/1

5:30 pm-11:57 pm

1 stop7h 27m

Boise Air Term. Gowen Fld

Tue 10/7

9:00 am-9:43 pm

2 stops11h 43m

$198

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 60 results
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Best time to book a flight from Illinois to Idaho

Have a flexible travel schedule? Discover the best time to fly to Idaho from Illinois with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Illinois to Idaho

What is the cheapest month to book a flight from Illinois to Idaho?

Currently, October is the cheapest month in which you can book a flight from Illinois to Idaho (average of $314). Flying from Illinois to Idaho in June is currently the most expensive (average of $398). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IL to ID?

Find hourly flight availability from Illinois to Idaho. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Idaho as you normally would.

Weekly flight availability from Illinois to Idaho

Explore weekly flight availability from Illinois to Idaho. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 11, 2025.

The most flights from USIL to USID are scheduled on a Wednesday (9 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (7 on average).

Reviews of airlines servicing Idaho

Get insights into the airlines that provide service to Idaho. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Idaho. Reviews last updated September 11, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta from Illinois to Idaho. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.0

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.0

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Southwest
8.0
Very good
4,248 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.0

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Delta
8.0
Very good
7,960 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.0

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
8,937 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.0

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.0

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Idaho. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Illinois to Idaho?

    There are many flights that can get you from Illinois to Idaho in 3h 42m. Fly via Delta, United Airlines, or Southwest to get the fastest option. Illinois and Idaho are separated by a distance of 1432 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Illinois to Idaho one-way?

    One-way options have recently been found by users for as low as $72 on Southwest. Other airlines that offer cheap prices include Delta from $79 and United Airlines from $79 one-way.

  • Can I find deals for flights from Illinois to Idaho that include hotel bookings?

    Yes. In addition to deals on Illinois to Idaho flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Idaho?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Idaho.

  • Can I find deals for business class flights from Illinois to Idaho?

    Yes. Cheapflights offers flight deals from Illinois to Idaho by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Illinois to Idaho?

    Currently, October is the cheapest month in which you can book a flight from Illinois to Idaho (average of $314). Flying from Illinois to Idaho in June is currently the most expensive (average of $398). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Alternative routes for Illinois to Idaho

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Illinois to Idaho

Discover the top 5 airlines that operate flights from Illinois to Idaho. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$174Average$335FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$204Average$381FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$237Average$504FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$254Average$348FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$265Average$554FlexibilityNo cancel feeOn-time69%

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