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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 4/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Feb 7 — Feb 141
Sat 2/7
Sat 2/14
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 January 8, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$181
(Delta)

One-way from

$72
(Frontier)

Popular in

November

Cheapest in

September

Average price

$396

Good round-trip deal

$357 or less

Good one-way deal

$127 or less
Provider with most accurate pricing for Chicago (CHI)-Boise Air Term. Gowen Fld flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Boise Air Term. Gowen Fld flights.
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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. 1% potential increase in price ($6 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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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 January 8, 2026.

This Delta deal was found by Cheapflights users on 1/8. 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 2/62:20 pmORD - BOI
1 stop8h 38mDelta
Sun 2/85:40 amBOI - ORD
1 stop6h 42mDelta
Deal found 1/8$181
This Delta deal was found by Cheapflights users on 1/7. 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.
Thu 1/292:20 pmORD - GEG
1 stop6h 25mDelta
Sun 2/17:30 pmGEG - ORD
1 stop15h 52mDelta
Deal found 1/7$181
This Kiwi.com deal was found by Cheapflights users on 1/7. 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.
Wed 2/118:10 amORD - BOI
2 stops28h 41mFrontier
Sun 2/1511:56 amBOI - ORD
1 stop11h 24mFrontier
Deal found 1/7$186
This Delta deal was found by Cheapflights users on 1/7. 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.
Thu 2/197:15 amORD - BOI
2 stops12h 07mDelta
Mon 2/231:51 pmBOI - ORD
1 stop9h 01mDelta
Deal found 1/7$187
This Delta deal was found by Cheapflights users on 1/8. 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.
Sat 1/317:30 amORD - GEG
1 stop7h 07mDelta
Tue 2/35:05 amGEG - ORD
2 stops10h 50mDelta
Deal found 1/8$187
This Delta deal was found by Cheapflights users on 1/7. 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.
Thu 2/191:26 pmMDW - BOI
2 stops9h 30mDelta
Mon 2/237:15 pmBOI - MDW
2 stops12h 39mDelta
Deal found 1/7$192
This Delta deal was found by Cheapflights users on 1/7. 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.
Thu 2/268:50 amORD - BOI
2 stops12h 25mDelta
Tue 3/37:30 amBOI - ORD
2 stops13h 00mDelta
Deal found 1/7$192
This Delta deal was found by Cheapflights users on 1/7. 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 1/301:50 pmORD - GEG
2 stops11h 02mDelta
Mon 2/27:30 pmGEG - ORD
2 stops12h 11mDelta
Deal found 1/7$192
This Delta deal was found by Cheapflights users on 1/7. 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 1/301:49 pmMDW - GEG
2 stops11h 03mDelta
Mon 2/27:30 pmGEG - MDW
2 stops11h 22mDelta
Deal found 1/7$192
This Delta deal was found by Cheapflights users on 1/6. 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.
Tue 5/56:03 pmORD - GEG
1 stop8h 04mDelta
Wed 5/131:00 pmGEG - ORD
1 stop8h 47mDelta
Deal found 1/6$199
This Delta deal was found by Cheapflights users on 1/7. 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 4/87:25 amORD - GEG
1 stop7h 35mDelta
Mon 4/133:29 pmGEG - ORD
1 stop6h 29mDelta
Deal found 1/7$209
This Delta deal was found by Cheapflights users on 1/6. 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.
Sat 5/95:00 pmORD - GEG
2 stops8h 44mDelta
Wed 5/135:20 amGEG - ORD
2 stops10h 41mDelta
Deal found 1/6$210

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 January 8, 2026.
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

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Fri 2/6

2:20 pm-9:58 pm

1 stop8h 38m

Boise Air Term. Gowen Fld

Sun 2/8

5:40 am-1:22 pm

1 stop6h 42m

$181

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Thu 2/26

2:20 pm-9:56 pm

1 stop8h 36m

Boise Air Term. Gowen Fld

Tue 3/3

1:51 pm-11:52 pm

1 stop9h 01m

$181

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Wed 3/18

7:25 am-2:45 pm

1 stop9h 20m

Spokane

Sat 3/21

3:25 pm-11:52 pm

1 stop6h 27m

$181

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Wed 2/4

2:20 pm-6:45 pm

1 stop6h 25m

Spokane

Wed 2/11

1:20 pm-11:53 pm

1 stop8h 33m

$181

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Thu 2/5

1:50 pm-10:52 pm

2 stops11h 02m

Spokane

Mon 2/9

5:05 am-1:22 pm

1 stop6h 17m

$187

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Thu 2/19

1:26 pm-9:56 pm

2 stops9h 30m

Boise Air Term. Gowen Fld

Mon 2/23

7:15 pm-8:54 am

2 stops12h 39m

$192

ChicagoSpokane

MDW - GEG

MDWGEG

Chicago Midway

Fri 1/30

1:49 pm-10:52 pm

2 stops11h 03m

Spokane

Mon 2/2

7:30 pm-8:52 am

2 stops11h 22m

$192

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Mon 2/16

7:15 am-2:58 pm

2 stops9h 43m

Spokane

Mon 2/23

7:30 pm-9:41 am

2 stops12h 11m

$192

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Sat 3/14

5:00 pm-12:02 am

2 stops9h 02m

Spokane

Fri 3/20

9:40 am-9:34 pm

2 stops9h 54m

$192

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Wed 4/8

7:25 am-1:00 pm

1 stop7h 35m

Spokane

Mon 4/13

3:29 pm-11:58 pm

1 stop6h 29m

$209

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/7

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, July is the cheapest month in which you can book a flight from Illinois to Idaho (average of $149). Flying from Illinois to Idaho in December is currently the most expensive (average of $288). 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 January 8, 2026.

It’s typically best to fly out from Illinois to Idaho at noon. Doing so could potentially save you 32% on the flight price compared to flying in the afternoon, which is usually more expensive.

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 January 8, 2026.

The most flights from USIL to USID are scheduled on a Monday (6 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 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 January 8, 2026.
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
11,661 reviews

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Alaska Airlines
8.0
Very good
11,661 reviews
Alaska Airlines
8.0
Very good
11,661 reviews

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Southwest
8.0
Very good
4,250 reviews
Alaska Airlines
8.0
Very good
11,661 reviews

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Delta
7.9
Good
8,025 reviews
Alaska Airlines
8.0
Very good
11,661 reviews

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
United Airlines
7.4
Good
9,139 reviews
Alaska Airlines
8.0
Very good
11,661 reviews

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
American Airlines
7.2
Good
11,095 reviews
Alaska Airlines
8.0
Very good
11,661 reviews

Crew

8.5

Overall

8.0

Food

7.1

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.

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 7h 25m. Fly via Delta, Alaska Airlines, or Southwest to get the fastest option. Illinois and Idaho are separated by a distance of 1378 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 $77 on Alaska Airlines. Other airlines that offer cheap prices include Delta from $87 and Southwest from $87 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, July is the cheapest month in which you can book a flight from Illinois to Idaho (average of $149). Flying from Illinois to Idaho in December is currently the most expensive (average of $288). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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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 4 airlines flying from Illinois to Idaho

Discover the top 4 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 January 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$174Average$333FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$237Average$412FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$249Average$487FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$254Average$333FlexibilityNo cancel feeOn-time63%

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