HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$102+ 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 2/18. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ORD
Jan 26 — Feb 21
Sun 1/26
Sun 2/2
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

Discover tips and strategies to find the most affordable flight options for your journey from Boise (BOI) to Illinois (USIL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 21, 2025.

Round-trip from

$249
(Delta)

One-way from

$102
(Kiwi.com)
From Boise Air Term. Gowen Fld to Illinois
Search Deals
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 January 21, 2025.

This Delta deal was found by Cheapflights users on 1/19. 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 2/65:30 amBOI - MDW
1 stop6h 12mDelta
Sun 2/96:00 amMDW - BOI
1 stop7h 28mDelta
Deal found 1/19$249
This Delta deal was found by Cheapflights users on 1/19. 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 10/27:30 amBOI - ORD
1 stop9h 20mDelta
Mon 10/62:20 pmORD - BOI
1 stop8h 47mDelta
Deal found 1/19$249
This United Airlines deal was found by Cheapflights users on 1/20. 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 3/45:30 pmBOI - ORD
1 stop5h 28mUnited Airlines
Tue 3/117:35 pmORD - BOI
Nonstop4h 10mUnited Airlines
Deal found 1/20$259
This Alaska Airlines deal was found by Cheapflights users on 1/20. 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.
Wed 2/59:30 amBOI - ORD
1 stop7h 29mAlaska Airlines
Sun 2/96:55 pmORD - BOI
1 stop19h 06mAlaska Airlines
Deal found 1/20$269
This Cheapflightsfares deal was found by Cheapflights users on 1/20. 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 5/19:49 pmBOI - ORD
1 stop13h 25mSpirit Airlines
Mon 5/51:14 pmORD - BOI
1 stop8h 35mSpirit Airlines
Deal found 1/20$275
This American Airlines deal was found by Cheapflights users on 1/19. 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 8/201:38 pmBOI - ORD
1 stop9h 41mAmerican Airlines
Sun 8/249:45 amORD - BOI
Nonstop3h 55mAmerican Airlines
Deal found 1/19$299
This Delta deal was found by Cheapflights users on 1/20. 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 2/196:00 amBOI - STL
1 stop6h 43mDelta
Wed 2/266:00 amSTL - BOI
2 stops8h 45mDelta
Deal found 1/20$316
This American Airlines deal was found by Cheapflights users on 1/20. 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 2/191:56 pmBOI - STL
1 stop8h 43mAmerican Airlines
Wed 2/267:15 amSTL - BOI
1 stop7h 01mAmerican Airlines
Deal found 1/20$319
This Southwest deal was found by Cheapflights users on 1/19. 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.
Tue 2/412:20 pmBOI - ORD
2 stops9h 15mSouthwest
Tue 2/116:15 amORD - BOI
1 stop10h 10mSouthwest
Deal found 1/19$334
This Southwest deal was found by Cheapflights users on 1/20. 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.
Wed 3/195:05 pmBOI - MDW
1 stop5h 00mSouthwest
Wed 3/265:40 amMDW - BOI
1 stop8h 10mSouthwest
Deal found 1/20$339
This Mytrip deal was found by Cheapflights users on 1/19. 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.
Fri 1/247:38 pmBOI - ORD
1 stop8h 53mMultiple Airlines
Sat 2/112:25 pmORD - BOI
2 stops22h 24mMultiple Airlines
Deal found 1/19$352
This Southwest deal was found by Cheapflights users on 1/19. 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.
Sun 2/165:15 pmBOI - STL
1 stop7h 15mSouthwest
Sun 2/237:30 pmSTL - BOI
1 stop6h 15mSouthwest
Deal found 1/19$379

Find flights from Boise to Illinois within your budget

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 January 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Tue 3/4

7:41 pm-6:36 am

1 stop9h 55m

Chicago O'Hare Intl

Tue 3/11

10:49 am-12:32 pm

3 stops26h 43m

$248

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

Tue 3/4

5:30 am-12:42 pm

1 stop6h 12m

Chicago Midway

Tue 3/11

7:09 pm-11:59 pm

1 stop5h 50m

$249

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Tue 2/4

5:45 am-1:30 pm

1 stop6h 45m

Chicago O'Hare Intl

Tue 2/11

7:15 am-1:45 pm

1 stop7h 30m

$249

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Fri 1/31

7:38 pm-5:31 am

1 stop8h 53m

Chicago O'Hare Intl

Tue 2/4

7:45 am-1:45 pm

1 stop7h 00m

$297

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 2/19

5:45 am-4:53 pm

2 stops10h 08m

Lambert-St Louis

Wed 2/26

10:22 am-8:15 pm

2 stops10h 53m

$314

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 2/19

1:56 pm-11:39 pm

1 stop8h 43m

Lambert-St Louis

Wed 2/26

7:15 am-1:16 pm

1 stop7h 01m

$319

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Tue 2/4

12:20 pm-10:35 pm

2 stops9h 15m

Chicago O'Hare Intl

Tue 2/11

6:15 am-3:25 pm

1 stop10h 10m

$334

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Thu 2/20

5:30 pm-11:58 pm

1 stop5h 28m

Chicago O'Hare Intl

Tue 2/25

7:35 pm-10:45 pm

Nonstop4h 10m

$339

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Thu 2/20

5:00 pm-5:53 am

1 stop11h 53m

Chicago O'Hare Intl

Tue 2/25

5:54 pm-8:30 am

2 stops15h 36m

$352

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sun 2/16

5:15 pm-1:30 am

1 stop7h 15m

Lambert-St Louis

Sun 2/23

7:30 pm-12:45 am

1 stop6h 15m

$379

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/19

Showing 1-10 of 33 results
1
2
3
4

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.

Travel insights for flights from Boise to Illinois

Get recent, data-driven insights about flights from Boise to Illinois including ideal travel times, pricing trends, and more.

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 $320). 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 January 21, 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 January 21, 2025.

The most flights from BOI to USIL are scheduled on a Monday (7 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (2 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 January 21, 2025.
Read through reviews of airlines operating flights from Boise to Illinois, such as Alaska Airlines, Spirit Airlines and Southwest. 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.
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Entertainment

7.7

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,659 reviews
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Entertainment

7.7

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,696 reviews
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Entertainment

7.7

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,521 reviews
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Entertainment

7.7

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,982 reviews
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Entertainment

7.7

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Entertainment

7.7

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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 $102 on Spirit Airlines. Other airlines that offer cheap prices include Alaska Airlines from $114 and Delta from $115 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 - Lambert-St Louis or Boise Air Term. Gowen Fld - Chicago Midway when deciding on the best route from Boise to Illinois.

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

    Consider Lufthansa (88%), SkyWest Airlines (88%) or United Airlines (88%) 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 $1,222, our data indicates the cheapest price to be $239. The most popular route (Boise Air Term. Gowen Fld - Chicago O'Hare Intl), is priced around $199.

  • 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 $320). 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 Sky Harbor Intl flights
Boise to Seattle flights
Boise to Sky Harbor Intl flights
Boise to Las Vegas flights
Spokane to Denver flights
Boise to Los Angeles flights
Spokane to Seattle flights
Spokane to Salt Lake City flights
Spokane to Las Vegas flights
Boise to Dallas/Fort Worth flights
Spokane to Dallas/Fort Worth flights
Spokane to Los Angeles flights
Boise to San Diego flights
Boise to Honolulu flights
Boise to Orlando flights
Spokane to San Francisco flights
Boise to John F Kennedy Intl flights
Boise to Fort Lauderdale flights
Spokane to San Jose flights
Spokane to San Diego flights
Boise to Minneapolis flights
Spokane to New Orleans flights
Spokane to Tampa flights
Spokane to Kahului flights
Spokane to Minneapolis flights
Idaho Falls to New Orleans flights
Boise to Kahului flights
Boise to Denver flights
Idaho Falls to Denver flights
Spokane to Honolulu flights
Boise to Portland flights
Boise to Santa Ana flights
Boise to Salt Lake City flights
Spokane to Atlanta flights
Boise to Miami flights
Boise to O'Hare Intl flights
Jackson to Dallas/Fort Worth flights
Spokane to John F Kennedy Intl flights
Lewiston to New Orleans flights
Boise to San Francisco flights
Boise to Hobby flights
Spokane to Orlando flights
Boise to Nashville flights
Spokane to Fort Lauderdale flights
Boise to New Orleans flights
Boise to LaGuardia flights
Boise to Ontario flights
Spokane to Newark flights
Idaho Falls to Seattle flights
Spokane to Boise 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 January 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$114Average$208FlexibilityNo cancel feeOn-time65%
DeltaCheapest$185Average$343FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$215Average$368FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$236Average$545FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$294Average$584FlexibilityNo cancel feeOn-time69%
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.