HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$74+ 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 10/21. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ORD
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Boise to Illinois with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 septiembre 11, 2025.

Round-trip from

$207
(United Airlines)

One-way from

$74
(American Airlines)

Popular in

December

Cheapest in

January

Average price

$352

Good round-trip deal

$351 or less

Good one-way deal

$187 or less
From Boise Air Term. Gowen Fld to Illinois
Search Deals
One-way flight from Boise Air Term. Gowen Fld to Illinois
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($20 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals
Price to beat on a round-trip flight from Boise Air Term. Gowen Fld to Illinois.
Search Deals
Price to beat on a one-way flight from Boise Air Term. Gowen Fld to Illinois.
Search Deals

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 septiembre 11, 2025.

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.
mié. 10/222:39 pmBOI - STL
1 stop5h 07mUnited Airlines
lun. 10/275:29 pmSTL - BOI
1 stop6h 59mUnited Airlines
Deal found 9/9$207
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.
sáb. 10/183:00 pmBOI - STL
1 stop7h 07mDelta
lun. 10/207:30 pmSTL - BOI
1 stop5h 29mDelta
Deal found 9/10$220
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/35:43 pmBOI - STL
1 stop5h 55mDelta
mar. 10/78:53 amSTL - BOI
1 stop6h 09mDelta
Deal found 9/9$234
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/106:22 pmBOI - ORD
1 stop24h 20mMultiple Airlines
jue. 11/136:00 amORD - BOI
1 stop6h 43mMultiple Airlines
Deal found 9/9$241
This Hawaiian 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/87:13 amBOI - ORD
1 stop10h 46mHawaiian Airlines
mié. 10/156:00 amORD - BOI
1 stop8h 10mHawaiian Airlines
Deal found 9/9$242
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 10/53:10 pmBOI - ORD
Nonstop3h 30mUnited Airlines
sáb. 11/18:45 amORD - BOI
Nonstop3h 54mUnited Airlines
Deal found 9/11$243
This Orbitz 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/269:26 pmBOI - ORD
1 stop13h 25mMultiple Airlines
lun. 9/298:00 amORD - BOI
1 stop8h 00mMultiple Airlines
Deal found 9/11$244
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/285:54 amBOI - ORD
1 stop6h 15mAlaska Airlines
dom. 11/22:54 pmORD - BOI
1 stop9h 55mAlaska Airlines
Deal found 9/9$245
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/2411:39 pmBOI - MDW
1 stop9h 01mDelta
lun. 10/279:20 amMDW - BOI
1 stop5h 42mDelta
Deal found 9/9$246
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.
lun. 9/299:26 pmBOI - ORD
2 stops19h 48mMultiple Airlines
vie. 10/39:54 pmORD - BOI
1 stop16h 27mMultiple Airlines
Deal found 9/10$246
This Hawaiian 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/274:00 pmBOI - ORD
1 stop7h 04mHawaiian Airlines
sáb. 10/46:00 amORD - BOI
1 stop9h 36mHawaiian Airlines
Deal found 9/9$248
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.
mié. 10/82:44 pmBOI - ORD
1 stop7h 28mUnited Airlines
vie. 10/104:05 pmORD - BOI
Nonstop3h 42mUnited Airlines
Deal found 9/9$250

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 septiembre 11, 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

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

mié. 10/22

2:39 pm-8:46 pm

1 stop5h 07m

Lambert-St Louis

lun. 10/27

5:29 pm-11:28 pm

1 stop6h 59m

$207

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

sáb. 10/18

3:00 pm-11:07 pm

1 stop7h 07m

Lambert-St Louis

lun. 10/20

7:30 pm-11:59 pm

1 stop5h 29m

$220

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

vie. 10/3

5:43 pm-12:38 am

1 stop5h 55m

Lambert-St Louis

mar. 10/7

8:53 am-2:02 pm

1 stop6h 09m

$234

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

vie. 11/7

5:30 am-1:30 pm

1 stop7h 00m

Chicago O'Hare Intl

mié. 11/12

2:15 pm-11:10 pm

2 stops9h 55m

$243

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

mar. 10/28

5:54 am-1:09 pm

1 stop6h 15m

Chicago O'Hare Intl

dom. 11/2

2:54 pm-11:49 pm

1 stop9h 55m

$245

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

vie. 11/14

6:28 am-4:57 pm

1 stop9h 29m

Chicago O'Hare Intl

lun. 11/17

6:00 am-3:12 pm

1 stop10h 12m

$254

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

mar. 9/30

2:28 pm-10:07 pm

1 stop6h 39m

Chicago O'Hare Intl

lun. 10/6

7:59 pm-11:34 am

1 stop16h 35m

$254

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

mar. 11/4

5:42 am-1:08 pm

1 stop6h 26m

Chicago Midway

mié. 11/12

9:41 am-2:04 pm

1 stop5h 23m

$255

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

mar. 11/4

5:42 am-1:08 pm

1 stop6h 26m

Chicago Midway

sáb. 11/8

7:10 pm-11:54 pm

1 stop5h 44m

$255

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

mar. 10/21

12:40 pm-10:40 pm

2 stops9h 00m

Chicago Midway

jue. 10/23

6:25 pm-12:20 am

1 stop6h 55m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 60 results
1
2
3
...
6

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 septiembre 11, 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 septiembre 11, 2025.

The most flights from BOI to USIL are scheduled on a Wednesday (13 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (9 on average).

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 septiembre 11, 2025.
Read through reviews of airlines operating flights from Boise to Illinois, such as Alaska Airlines, Southwest, and Delta. 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

Comfort

7.8

Entertainment

7.0

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

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

Comfort

7.8

Entertainment

7.0

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

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

Comfort

7.8

Entertainment

7.0

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

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

Comfort

7.8

Entertainment

7.0

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

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

Comfort

7.8

Entertainment

7.0

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

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

Comfort

7.8

Entertainment

7.0

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

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 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.

  • How long is the flight from Boise to Illinois?

    United Airlines, Delta, and Southwest can get you from Boise to Illinois in just under 5h 07m. Your travel time can differ by up to 2h. The distance between Boise and Illinois is about 1378 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 $77 on Southwest. Other airlines that offer cheap prices include Delta from $79 and Frontier from $85 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 (85%), Air Canada (76%) or United Airlines (76%) 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 $693, our data indicates the cheapest price to be $134. The most popular route (Boise Air Term. Gowen Fld - Chicago O'Hare Intl), is priced around $157.

  • 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Boise to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Spokane to Seattle flights
Boise to Las Vegas flights
Boise to Seattle flights
Boise to Los Angeles flights
Boise to Sky Harbor Intl flights
Spokane to Sky Harbor Intl flights
Boise to Denver flights
Boise to Portland flights
Boise to Dallas/Fort Worth flights
Boise to O'Hare Intl flights
Boise to San Diego flights
Spokane to Dallas/Fort Worth flights
Boise to Sacramento flights
Spokane to Los Angeles flights
Spokane to San Diego flights
Boise to Minneapolis flights
Spokane to Las Vegas flights
Boise to John F Kennedy Intl flights
Boise to Burbank flights
Spokane to Denver flights
Boise to Spokane flights
Boise to Honolulu flights
Boise to Hobby flights
Boise to Santa Ana flights
Boise to Newark flights
Boise to San Francisco flights
Spokane to Boise flights
Boise to Orlando flights
Boise to LaGuardia flights
Spokane to Salt Lake City flights
Boise to Ontario flights
Spokane to O'Hare Intl flights
Spokane to San Francisco flights
Spokane to John F Kennedy Intl flights
Boise to Atlanta flights
Spokane to Miami flights
Spokane to Portland flights
Spokane to Minneapolis flights
Boise to Kahului flights
Spokane to Orlando flights
Spokane to Honolulu flights
Boise to San Jose flights
Boise to Fort Lauderdale flights
Spokane to Kahului flights
Spokane to Nashville flights
Spokane to Reagan-National flights
Spokane to Tampa flights
Spokane to Hobby flights
Boise to George Bush Intcntl flights
Spokane to Lihue flights

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 septiembre 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$139Average$274FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$224Average$327FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$232Average$491FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$233Average$378FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$247Average$486FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.