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$91+ Cheap flights from Illinois to Boise (BOI)

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 Boise

Keep the following information in mind while searching for Illinois to Boise 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 Boise Air Term. Gowen Fld
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One-way flight from Illinois to Boise Air Term. Gowen Fld
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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 Boise Air Term. Gowen Fld.
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Price to beat on a one-way flight from Illinois to Boise Air Term. Gowen Fld.
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Find flight deals from Illinois to Boise

Cheapest flights from Illinois to Boise
Explore the most affordable flight options available from Illinois to Boise. 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 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 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 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 Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/163:35 pmSTL - BOI
1 stop8h 05mAlaska Airlines
mié. 9/246:35 amBOI - STL
1 stop7h 04mAlaska Airlines
Deal found 6/10$254
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/259:45 amORD - BOI
Nonstop3h 59mAmerican Airlines
mié. 10/291:17 pmBOI - ORD
Nonstop3h 37mAmerican Airlines
Deal found 6/12$255
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.
jue. 9/186:59 pmSTL - BOI
1 stop6h 18mDelta
jue. 9/2511:30 pmBOI - STL
1 stop7h 40mDelta
Deal found 6/10$255
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 6/225:40 amORD - BOI
1 stop7h 07mFrontier
dom. 6/2912:36 pmBOI - ORD
1 stop10h 07mFrontier
Deal found 6/10$260
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/84:00 pmSTL - BOI
2 stops8h 05mSouthwest
lun. 9/154:30 pmBOI - STL
1 stop6h 25mSouthwest
Deal found 6/10$260
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 8/206:15 amORD - BOI
1 stop8h 34mUnited Airlines
mié. 10/228:20 amBOI - ORD
Nonstop3h 39mUnited Airlines
Deal found 6/10$261

Cheapflights Fare Finder

Customize your flight search to find flights from Illinois to Boise 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 Boise that are best for you.

Fly from

Illinois

Fly to

Boise

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

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

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

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

mar. 7/15

6:00 am-3:04 pm

1 stop10h 04m

Boise Air Term. Gowen Fld

mar. 7/22

4:00 pm-11:39 pm

1 stop6h 39m

$234

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

lun. 9/8

6:30 pm-9:28 am

1 stop15h 58m

Boise Air Term. Gowen Fld

lun. 9/15

4:34 pm-11:59 pm

1 stop6h 25m

$254

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

jue. 8/21

6:00 am-12:19 pm

1 stop7h 19m

Boise Air Term. Gowen Fld

mar. 8/26

1:36 pm-11:14 pm

1 stop8h 38m

$255

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

dom. 6/22

5:40 am-11:47 am

1 stop7h 07m

Boise Air Term. Gowen Fld

dom. 6/29

12:36 pm-11:43 pm

1 stop10h 07m

$260

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

lun. 9/8

4:00 pm-11:05 pm

2 stops8h 05m

Boise Air Term. Gowen Fld

lun. 9/15

4:30 pm-11:55 pm

1 stop6h 25m

$260

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 46 results
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Best time to book a flight from Illinois to Boise

Have a flexible travel schedule? Discover the best time to fly to Boise 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 Boise

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

Currently, October is the cheapest month in which you can book a flight from Illinois to Boise (average of $314). Flying from Illinois to Boise 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 BOI?

Find hourly flight availability from Illinois to Boise. 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 Boise as you normally would.

Weekly flight availability from Illinois to Boise

Explore weekly flight availability from Illinois to Boise. 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 BOI 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 Boise by month

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

In terms of precipitation, rainfall in Boise 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 Boise when rainfall is around 0.2 in.

Temperature in Boise by month

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

If weather is an important factor for your trip to Boise, 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 Boise

Get insights into the airlines that provide service to Boise. 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 Boise. Reviews last updated junio 12, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Illinois to Boise to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

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

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

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

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

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
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

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

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

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

Entertainment

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

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 Boise. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Boise from Illinois?

    Boise Air Term. Gowen Fld (BOI), located 3.3 mi from the city center, is the airport you fly into when you book flights from Illinois to Boise.

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

    $91 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on Spirit Airlines and Southwest, with prices starting from $95 and $96, respectively.

  • What are the most popular routes from Illinois to Boise?

    The most popular route from Illinois to Boise is Chicago O'Hare Intl - Boise Air Term. Gowen Fld. You may also consider Chicago Midway - Boise Air Term. Gowen Fld or Lambert-St Louis - Boise Air Term. Gowen Fld.

  • What are the most reliable airlines from Illinois to Boise?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Illinois to Boise on time: SkyWest Airlines (84%), United Airlines (83%), Air Canada (81%).

  • What are the cheapest flights from Illinois to Boise?

    While on average a flight from Illinois to Boise is generally $310, our data shows the cheapest flight currently is $127. When looking at the most popular route, (Chicago O'Hare Intl - Boise Air Term. Gowen Fld), you can expect to pay $190 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Illinois to Boise 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 Boise?

    Currently, October is the cheapest month in which you can book a flight from Illinois to Boise (average of $314). Flying from Illinois to Boise 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

Traveling to a place near Illinois?

Book flights to Illinois if you plan to visit one of these locations
Nampa
Meridian
Ontario
McCall
Caldwell

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Alternative routes for Illinois to Boise

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 Boise

Discover the top 6 airlines that operate flights from Illinois to Boise. 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$288FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$204Average$337FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$237Average$552FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$258Average$348FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$271Average$524FlexibilityNo cancel feeOn-time69%

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