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

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 8/16. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ORD
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheap flight deals from Boise to Illinois

Keep the following information in mind while searching for Boise to Illinois flight deals. Data was last updated June 12, 2025.

Round-trip from

$191
(Cheapflightsfares)

One-way from

$91
(Delta)

Popular in

December

Cheapest in

January

Average price

$372

Good round-trip deal

$349 or less

Good one-way deal

$179 or less
From Boise Air Term. Gowen Fld to Illinois
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One-way flight from Boise Air Term. Gowen Fld to Illinois
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Highest demand for flights based on searches. 4% potential increase in price ($16 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 June 2025
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Price to beat on a round-trip flight from Boise Air Term. Gowen Fld to Illinois.
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Price to beat on a one-way flight from Boise Air Term. Gowen Fld to Illinois.
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Find flight deals from Boise to Illinois

Cheapest flights from Boise to Illinois
Explore the most affordable flight options available from Boise to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 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.
Thu 10/29:49 pmBOI - ORD
1 stop15h 27mSpirit Airlines
Mon 10/66:00 amORD - BOI
1 stop15h 44mSpirit Airlines
Deal found 6/11$189
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.
Fri 10/311:30 pmBOI - ORD
1 stop8h 04mDelta
Sat 10/117:30 amORD - BOI
1 stop9h 59mDelta
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.
Sat 7/125:40 amBOI - MDW
1 stop6h 26mDelta
Sat 7/199:25 amMDW - BOI
2 stops8h 40mDelta
Deal found 6/10$200
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.
Tue 8/54:00 pmBOI - ORD
1 stop6h 39mHawaiian Airlines
Wed 8/66:00 amORD - BOI
1 stop10h 04mHawaiian Airlines
Deal found 6/11$229
This Alaska Airlines deal was found by Cheapflights users on 6/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/24:00 pmBOI - ORD
1 stop12h 00mAlaska Airlines
Tue 10/78:20 amORD - BOI
1 stop15h 51mAlaska Airlines
Deal found 6/9$253
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/77:08 pmBOI - ORD
1 stop21h 09mMultiple Airlines
Mon 8/183:21 pmORD - BOI
1 stop6h 23mMultiple Airlines
Deal found 6/10$262
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/131:07 pmBOI - PIA
1 stop7h 48mAmerican Airlines
Mon 8/186:00 amPIA - BOI
1 stop7h 19mAmerican Airlines
Deal found 6/10$269
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/2612:36 pmBOI - ORD
1 stop10h 23mFrontier
Sun 6/295:40 amORD - BOI
1 stop7h 07mFrontier
Deal found 6/11$270
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.
Sat 8/301:07 pmBOI - ORD
Nonstop3h 33mAmerican Airlines
Tue 9/29:40 amORD - BOI
Nonstop3h 39mAmerican Airlines
Deal found 6/12$274
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/127:15 pmBOI - ORD
1 stop9h 24mUnited Airlines
Sat 7/198:45 amORD - BOI
Nonstop3h 58mUnited Airlines
Deal found 6/11$277
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.
Tue 7/85:42 pmBOI - STL
1 stop5h 17mUnited Airlines
Tue 7/155:15 amSTL - BOI
1 stop5h 31mUnited Airlines
Deal found 6/10$279
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/306:00 amBOI - STL
1 stop6h 29mDelta
Sun 8/317:35 amSTL - BOI
1 stop5h 20mDelta
Deal found 6/11$287

Cheapflights Fare Finder

Customize your flight search to find flights from Boise to Illinois 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 June 12, 2025.
Use the filters below to find and compare flights from Boise to Illinois that are best for you.

Fly from

Boise

Fly to

Illinois

Route

Depart

Return

Price

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Sat 9/6

9:49 pm-2:16 pm

1 stop15h 27m

Chicago O'Hare Intl

Sat 9/13

6:00 am-8:44 pm

1 stop15h 44m

$191

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Tue 7/15

4:20 pm-11:56 pm

1 stop6h 36m

Chicago O'Hare Intl

Tue 7/22

7:20 pm-12:09 am

1 stop5h 49m

$195

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

Sat 7/12

5:40 am-1:06 pm

1 stop6h 26m

Chicago Midway

Sat 7/19

9:25 am-5:05 pm

2 stops8h 40m

$200

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Tue 8/5

4:00 pm-11:39 pm

1 stop6h 39m

Chicago O'Hare Intl

Wed 8/6

6:00 am-3:04 pm

1 stop10h 04m

$229

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Thu 8/7

7:08 pm-5:17 pm

1 stop21h 09m

Chicago O'Hare Intl

Mon 8/18

3:21 pm-8:44 pm

1 stop6h 23m

$262

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Mon 9/1

5:45 pm-10:04 pm

1 stop27h 19m

Chicago O'Hare Intl

Tue 9/9

10:00 am-5:18 pm

1 stop8h 18m

$264

BoisePeoria

BOI - PIA

BOIPIA

Boise Air Term. Gowen Fld

Wed 8/13

1:07 pm-9:55 pm

1 stop7h 48m

Greater Peoria

Mon 8/18

6:00 am-12:19 pm

1 stop7h 19m

$269

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Thu 6/26

12:36 pm-11:59 pm

1 stop10h 23m

Chicago O'Hare Intl

Sun 6/29

5:40 am-11:47 am

1 stop7h 07m

$270

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Sat 8/30

1:07 pm-5:40 pm

Nonstop3h 33m

Chicago O'Hare Intl

Tue 9/2

9:40 am-12:19 pm

Nonstop3h 39m

$274

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Sat 7/12

7:15 pm-5:39 am

1 stop9h 24m

Chicago O'Hare Intl

Sat 7/19

8:45 am-11:43 am

Nonstop3h 58m

$277

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 50 results
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Best time to book a flight from Boise to Illinois

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

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

Currently, August is the cheapest month in which you can book a flight from Boise to Illinois (average of $245). Flying from Boise to Illinois in March is currently the most expensive (average of $321). 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 BOI to IL?

Find hourly flight availability from Boise to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 12, 2025.

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

Weekly flight availability from Boise to Illinois

Explore weekly flight availability from Boise to Illinois. 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 June 12, 2025.

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

Rainfall in Illinois by month

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

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

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

If weather is an important factor for your trip to Illinois, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated June 12, 2025.
Read through reviews of airlines operating flights from Boise to Illinois, such as Alaska Airlines, Southwest and Delta. Users can see the overall rating for each airline as well as how each is rated 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

Overall

8.0

Boarding

8.1

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

Overall

8.0

Boarding

8.1

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

Overall

8.0

Boarding

8.1

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
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Overall

8.0

Boarding

8.1

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

Overall

8.0

Boarding

8.1

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

Overall

8.0

Boarding

8.1

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 Boise to Illinois. 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 from for flights from Boise to Illinois?

    If you book a flight to Illinois from Boise, you will be flying from Air Term. Gowen Fld, which is the city’s only airport. Boise Air Term. Gowen Fld (BOI) is located 3.3 mi from the center of Boise.

  • What are the cheapest airlines to fly from Boise to Illinois 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.

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

    Most travelers choose Boise Air Term. Gowen Fld - Chicago O'Hare Intl, Boise Air Term. Gowen Fld - Chicago Midway or Boise Air Term. Gowen Fld - Lambert-St Louis when deciding on the best route from Boise to Illinois.

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

    Consider SkyWest Airlines (92%), Air Canada (91%) or Lufthansa (91%) when booking your flight. These represent the most reliable airlines when flying from Boise to Illinois.

  • What are the cheapest flights from Boise to Illinois?

    Looking for the cheapest flight from Boise to Illinois? While on average our users pay $1,292, our data indicates the cheapest price to be $167. The most popular route (Boise Air Term. Gowen Fld - Chicago O'Hare Intl), is priced around $182.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Boise to Illinois (average of $245). Flying from Boise to Illinois in March is currently the most expensive (average of $321). 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 Boise to Illinois

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

Discover the top 5 airlines that operate flights from Boise to Illinois. 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$156Average$298FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$196Average$528FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$217Average$327FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$248Average$500FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$258Average$368FlexibilityNo cancel feeOn-time63%

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