HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$78+ 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 8/14. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ORD
may. 3 — may. 101
sáb. 5/3
sáb. 5/10
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 abril 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$175
(Delta)

One-way from

$78
(Southwest)

Popular in

December

Cheapest in

January

Average price

$390

Good round-trip deal

$412 or less

Good one-way deal

$139 or less
Provider with most accurate pricing for Boise Air Term. Gowen Fld-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Chicago (CHI) flights.
Search Deals
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. 1% potential increase in price ($4 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 April 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 abril 28, 2025.

This Delta deal was found by Cheapflights users on 4/26. 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.
dom. 6/2910:24 amBOI - MDW
1 stop6h 16mDelta
mié. 7/97:21 pmMDW - BOI
1 stop5h 38mDelta
Deal found 4/26$175
This Delta deal was found by Cheapflights users on 4/28. 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. 5/2812:50 pmBOI - ORD
1 stop7h 50mDelta
mié. 6/46:20 pmORD - BOI
1 stop6h 52mDelta
Deal found 4/28$175
This United Airlines deal was found by Cheapflights users on 4/28. 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. 9/1712:27 pmBOI - ORD
Nonstop3h 33mUnited Airlines
vie. 9/198:45 amORD - BOI
Nonstop3h 46mUnited Airlines
Deal found 4/28$189
This CheapOair deal was found by Cheapflights users on 4/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/152:57 pmBOI - STL
1 stop17h 12mFrontier
mié. 5/218:15 pmSTL - BOI
1 stop16h 36mFrontier
Deal found 4/27$227
This CheapOair deal was found by Cheapflights users on 4/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 6/512:36 pmBOI - ORD
1 stop10h 23mFrontier
dom. 6/86:00 amORD - BOI
1 stop6h 47mFrontier
Deal found 4/28$237
This Alaska Airlines deal was found by Cheapflights users on 4/28. 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. 5/277:06 pmBOI - ORD
1 stop9h 34mAlaska Airlines
sáb. 5/316:00 amORD - BOI
1 stop9h 05mAlaska Airlines
Deal found 4/28$264
This Orbitz deal was found by Cheapflights users on 4/28. 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.
dom. 9/79:49 pmBOI - ORD
2 stops23h 39mMultiple Airlines
mié. 9/106:20 amORD - BOI
1 stop9h 40mMultiple Airlines
Deal found 4/28$275
This Southwest deal was found by Cheapflights users on 4/26. 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.
mar. 7/17:05 pmBOI - MDW
1 stop8h 55mSouthwest
mar. 7/85:50 pmMDW - BOI
2 stops7h 50mSouthwest
Deal found 4/26$285
This Delta deal was found by Cheapflights users on 4/28. 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. 6/1811:40 pmBOI - STL
1 stop7h 43mDelta
lun. 6/237:15 pmSTL - BOI
1 stop5h 59mDelta
Deal found 4/28$287
This American Airlines deal was found by Cheapflights users on 4/28. 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.
vie. 6/201:15 pmBOI - ORD
Nonstop3h 37mAmerican Airlines
vie. 6/275:00 amORD - BOI
1 stop6h 56mAmerican Airlines
Deal found 4/28$295
This Southwest deal was found by Cheapflights users on 4/28. 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.
dom. 8/105:25 amBOI - ORD
2 stops8h 55mSouthwest
mar. 8/196:15 amORD - BOI
1 stop6h 30mSouthwest
Deal found 4/28$302
This United Airlines deal was found by Cheapflights users on 4/27. 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.
jue. 5/811:02 amBOI - STL
2 stops8h 59mUnited Airlines
dom. 5/115:20 amSTL - BOI
1 stop5h 39mUnited Airlines
Deal found 4/27$328

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 abril 28, 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 - MDW

BOIMDW

Boise Air Term. Gowen Fld

dom. 6/29

10:24 am-5:40 pm

1 stop6h 16m

Chicago Midway

jue. 7/10

6:00 am-12:42 pm

1 stop7h 42m

$175

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

mié. 5/28

12:50 pm-9:40 pm

1 stop7h 50m

Chicago O'Hare Intl

mié. 6/4

6:20 pm-12:12 am

1 stop6h 52m

$175

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

mié. 9/17

12:27 pm-5:00 pm

Nonstop3h 33m

Chicago O'Hare Intl

vie. 9/19

8:45 am-11:31 am

Nonstop3h 46m

$189

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

jue. 6/5

12:36 pm-11:59 pm

1 stop10h 23m

Chicago O'Hare Intl

dom. 6/8

6:00 am-11:47 am

1 stop6h 47m

$237

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

mar. 5/27

7:06 pm-5:40 am

1 stop9h 34m

Chicago O'Hare Intl

sáb. 5/31

6:00 am-2:05 pm

1 stop9h 05m

$264

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

dom. 9/7

9:49 pm-10:28 pm

2 stops23h 39m

Chicago O'Hare Intl

mié. 9/10

6:20 am-3:00 pm

1 stop9h 40m

$275

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

mar. 7/1

7:05 pm-5:00 am

1 stop8h 55m

Chicago Midway

mar. 7/8

5:50 pm-12:40 am

2 stops7h 50m

$285

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

vie. 5/23

5:40 pm-12:59 am

1 stop6h 19m

Lambert-St Louis

vie. 8/1

7:15 pm-12:09 am

1 stop5h 54m

$287

BoisePeoria

BOI - PIA

BOIPIA

Boise Air Term. Gowen Fld

mar. 7/15

7:16 am-3:41 pm

1 stop7h 25m

Greater Peoria

mar. 7/22

4:41 pm-9:55 pm

1 stop6h 14m

$294

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

vie. 6/20

1:15 pm-5:52 pm

Nonstop3h 37m

Chicago O'Hare Intl

vie. 6/27

5:00 am-10:56 am

1 stop6h 56m

$295

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 39 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.

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 abril 28, 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 abril 28, 2025.

The most flights from BOI to USIL are scheduled on a Monday (7 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (7 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 abril 28, 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
9,949 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

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
9,949 reviews
Alaska Airlines
8.0
Very good
9,949 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

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
4,292 reviews
Alaska Airlines
8.0
Very good
9,949 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

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
7,929 reviews
Alaska Airlines
8.0
Very good
9,949 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

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
2,402 reviews
Alaska Airlines
8.0
Very good
9,949 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

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
8,696 reviews
Alaska Airlines
8.0
Very good
9,949 reviews

Food

7.1

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

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 $78 on Southwest. Other airlines that offer cheap prices include United Airlines from $78 and Alaska Airlines from $87 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 Lufthansa (95%), SkyWest Airlines (93%) or Air Canada (93%) 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 $962, our data indicates the cheapest price to be $171. The most popular route (Boise Air Term. Gowen Fld - Chicago O'Hare Intl), is priced around $175.

  • 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.
Boise to Las Vegas flights
Boise to Los Angeles flights
Boise to Denver flights
Boise to Seattle flights
Boise to O'Hare Intl flights
Spokane to Seattle flights
Spokane to Dallas/Fort Worth flights
Spokane to San Diego flights
Boise to John F Kennedy Intl flights
Boise to Portland flights
Boise to Sky Harbor Intl flights
Spokane to Sky Harbor Intl flights
Spokane to Los Angeles flights
Spokane to Denver flights
Spokane to O'Hare Intl flights
Boise to Santa Ana flights
Boise to San Diego flights
Boise to Newark flights
Boise to Atlanta flights
Boise to Dallas/Fort Worth flights
Spokane to Las Vegas flights
Idaho Falls to Seattle flights
Boise to Minneapolis flights
Boise to Spokane flights
Spokane to Minneapolis flights
Boise to LaGuardia flights
Spokane to Boston flights
Boise to San Jose flights
Spokane to Salt Lake City flights
Boise to Orlando flights
Spokane to John F Kennedy Intl flights
Jackson to Seattle flights
Boise to Honolulu flights
Spokane to Newark flights
Spokane to Sacramento flights
Boise to Burbank flights
Boise to Sacramento flights
Boise to Midway flights
Spokane to Boise flights
Spokane to Atlanta flights
Jackson to Boston flights
Boise to Miami flights
Spokane to Midway flights
Boise to Tampa flights
Spokane to Portland flights
Jackson to O'Hare Intl flights
Boise to Austin flights
Jackson to Newark flights
Boise to San Francisco flights
Spokane to San Francisco flights

Top 6 airlines flying from Boise to Illinois

Discover the top 6 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 abril 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$127Average$309FlexibilityNo cancel feeOn-time65%
DeltaCheapest$186Average$333FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$196Average$527FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$217Average$333FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$268Average$570FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$324Average$384FlexibilityNo cancel feeOn-time63%

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.