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Idaho

$91+ 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 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
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 junio 12, 2025.

Round-trip from

$190
(Cheapflightsfares)

One-way from

$91
(Delta)

Popular in

November

Cheapest in

September

Average price

$394

Good round-trip deal

$302 or less

Good one-way deal

$187 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 ($60 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in June 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 junio 12, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 6/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/283:21 pmORD - BOI
1 stop6h 23mSpirit Airlines
vie. 10/39:49 pmBOI - ORD
1 stop15h 27mSpirit Airlines
Deal found 6/11$190
This Delta deal was found by Cheapflights users on 6/10. 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.
mié. 8/209:15 amMDW - BOI
1 stop5h 46mDelta
mié. 10/221:43 pmBOI - MDW
1 stop7h 01mDelta
Deal found 6/10$195
This Delta deal was found by Cheapflights users on 6/10. 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.
mar. 7/87:20 pmORD - BOI
1 stop5h 49mDelta
mar. 7/1512:50 pmBOI - ORD
1 stop8h 18mDelta
Deal found 6/10$195
This Delta deal was found by Cheapflights users on 6/10. 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.
vie. 7/116:15 pmORD - GEG
1 stop7h 49mDelta
mar. 7/153:38 pmGEG - ORD
1 stop6h 18mDelta
Deal found 6/10$205
This Delta deal was found by Cheapflights users on 6/10. 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.
sáb. 8/237:17 pmMDW - GEG
1 stop6h 16mDelta
sáb. 8/309:40 amGEG - MDW
2 stops9h 32mDelta
Deal found 6/10$210
This Alaska Airlines deal was found by Cheapflights users on 6/11. 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.
mar. 8/198:00 amORD - GEG
1 stop6h 28mAlaska Airlines
mié. 8/271:40 pmGEG - ORD
1 stop6h 24mAlaska Airlines
Deal found 6/11$214
This Hawaiian Airlines deal was found by Cheapflights users on 6/11. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/186:20 amORD - BOI
1 stop9h 40mHawaiian Airlines
mar. 9/236:35 amBOI - ORD
1 stop9h 14mHawaiian Airlines
Deal found 6/11$225
This Hawaiian Airlines deal was found by Cheapflights users on 6/11. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/136:00 amORD - GEG
1 stop8h 28mHawaiian Airlines
mié. 8/138:48 pmGEG - ORD
1 stop6h 52mHawaiian Airlines
Deal found 6/11$229
This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/105:40 amORD - BOI
1 stop7h 06mMultiple Airlines
vie. 8/159:49 pmBOI - ORD
1 stop15h 27mMultiple Airlines
Deal found 6/10$232
This Mytrip deal was found by Cheapflights users on 6/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 7/97:08 amORD - GEG
1 stop27h 35mMultiple Airlines
dom. 7/139:33 amGEG - ORD
1 stop18h 30mMultiple Airlines
Deal found 6/11$233
This Alaska Airlines deal was found by Cheapflights users on 6/12. 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.
mar. 7/156:00 amORD - BOI
1 stop10h 04mAlaska Airlines
mar. 7/224:00 pmBOI - ORD
1 stop6h 39mAlaska Airlines
Deal found 6/12$234
This Southwest deal was found by Cheapflights users on 6/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/121:25 pmMDW - GEG
Nonstop3h 55mSouthwest
mié. 9/172:45 pmGEG - MDW
1 stop12h 25mSouthwest
Deal found 6/11$234

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 junio 12, 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

ORD - BOI

ORDBOI

Chicago O'Hare Intl

jue. 9/4

3:21 pm-8:44 pm

1 stop6h 23m

Boise Air Term. Gowen Fld

dom. 9/7

9:49 pm-2:16 pm

1 stop15h 27m

$191

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

mié. 8/20

9:15 am-2:01 pm

1 stop5h 46m

Boise Air Term. Gowen Fld

mié. 10/22

1:43 pm-9:44 pm

1 stop7h 01m

$195

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

mar. 7/8

7:20 pm-12:09 am

1 stop5h 49m

Boise Air Term. Gowen Fld

mar. 7/15

12:50 pm-10:08 pm

1 stop8h 18m

$195

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

vie. 7/11

6:15 pm-12:04 am

1 stop7h 49m

Spokane

mar. 7/15

3:38 pm-11:56 pm

1 stop6h 18m

$205

ChicagoSpokane

MDW - GEG

MDWGEG

Chicago Midway

sáb. 8/23

7:17 pm-11:33 pm

1 stop6h 16m

Spokane

sáb. 8/30

9:40 am-9:12 pm

2 stops9h 32m

$210

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

mar. 8/19

8:00 am-12:28 pm

1 stop6h 28m

Spokane

mié. 8/27

1:40 pm-10:04 pm

1 stop6h 24m

$214

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

lun. 8/11

8:00 am-4:10 pm

1 stop9h 10m

Boise Air Term. Gowen Fld

mar. 8/19

4:00 pm-11:39 pm

1 stop6h 39m

$227

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

mié. 8/13

6:00 am-12:28 pm

1 stop8h 28m

Spokane

mié. 8/13

8:48 pm-5:40 am

1 stop6h 52m

$229

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

dom. 8/10

5:40 am-11:46 am

1 stop7h 06m

Boise Air Term. Gowen Fld

vie. 8/15

9:49 pm-2:16 pm

1 stop15h 27m

$232

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

mié. 7/9

7:08 am-8:43 am

1 stop27h 35m

Spokane

dom. 7/13

9:33 am-6:03 am

1 stop18h 30m

$233

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

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 $395). 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 junio 12, 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 junio 12, 2025.

The most flights from USIL to USID are scheduled on a Tuesday (7 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (6 on average).

Rainfall in Idaho by month

Plan your trip to Idaho by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Idaho ranges from 0.2 - 1.6 inches per month. December is typically the wettest month, when rainfall can reach 1.6 in. August is typically the driest time to visit Idaho when rainfall is around 0.2 in.

Temperature in Idaho by month

Plan your trip to Idaho by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Idaho, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 75.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 30.2 F).

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 junio 12, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Illinois to Idaho. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

  • 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 $91 on Delta. Other airlines that offer cheap prices include Spirit Airlines from $95 and Southwest from $96 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 $395). 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

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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 6 airlines flying from Illinois to Idaho

Discover the top 6 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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$104Average$274FlexibilityNo cancel feeOn-time65%
DeltaCheapest$174Average$413FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$204Average$337FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$237Average$522FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$258Average$348FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$271Average$567FlexibilityNo cancel feeOn-time69%

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