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$77+ 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 11/3. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ORD
ago. 3 — ago. 101
dom. 8/3
dom. 8/10
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 julio 29, 2025.

Round-trip from

$211
(Cheapflightsfares)

One-way from

$77
(Booking.com)

Popular in

December

Cheapest in

January

Average price

$431

Good round-trip deal

$320 or less

Good one-way deal

$185 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 ($18 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 July 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 julio 29, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 7/26. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/22:16 pmBOI - ORD
1 stop13h 33mSpirit Airlines
lun. 10/68:15 amORD - BOI
1 stop13h 06mSpirit Airlines
Deal found 7/26$211
This Alaska Airlines deal was found by Cheapflights users on 7/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/47:13 amBOI - ORD
1 stop15h 46mAlaska Airlines
mar. 10/76:00 amORD - BOI
1 stop9h 36mAlaska Airlines
Deal found 7/27$214
This Delta deal was found by Cheapflights users on 7/28. 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.
sáb. 9/205:25 amBOI - MDW
1 stop6h 38mDelta
mié. 10/19:20 amMDW - BOI
1 stop5h 55mDelta
Deal found 7/28$215
This Delta deal was found by Cheapflights users on 7/28. 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. 9/244:20 pmBOI - ORD
1 stop6h 35mDelta
sáb. 10/42:25 pmORD - BOI
1 stop6h 55mDelta
Deal found 7/28$215
This Southwest deal was found by Cheapflights users on 7/28. 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.
mar. 9/2312:45 pmBOI - MDW
1 stop8h 15mSouthwest
mar. 10/77:10 amMDW - BOI
1 stop7h 35mSouthwest
Deal found 7/28$235
This United Airlines deal was found by Cheapflights users on 7/28. 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.
mar. 9/2312:27 pmBOI - ORD
Nonstop3h 33mUnited Airlines
vie. 9/264:05 pmORD - BOI
Nonstop3h 42mUnited Airlines
Deal found 7/28$235
This Frontier deal was found by Cheapflights users on 7/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/712:36 pmBOI - ORD
1 stop10h 56mFrontier
dom. 9/76:00 amORD - BOI
1 stop6h 37mFrontier
Deal found 7/28$238
This Hawaiian Airlines deal was found by Cheapflights users on 7/28. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/194:00 pmBOI - ORD
1 stop6h 39mHawaiian Airlines
mar. 8/268:00 amORD - BOI
1 stop8h 00mHawaiian Airlines
Deal found 7/28$250
This American Airlines deal was found by Cheapflights users on 7/29. 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.
mar. 8/261:10 pmBOI - ORD
Nonstop3h 33mAmerican Airlines
lun. 9/19:50 amORD - BOI
Nonstop3h 39mAmerican Airlines
Deal found 7/29$266
This Delta deal was found by Cheapflights users on 7/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/231:35 pmBOI - MLI
1 stop8h 13mDelta
mar. 8/266:00 amMLI - BOI
1 stop7h 35mDelta
Deal found 7/27$269
This United Airlines deal was found by Cheapflights users on 7/28. 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.
lun. 8/185:42 pmBOI - STL
1 stop5h 17mUnited Airlines
mar. 8/196:35 amSTL - BOI
1 stop5h 56mUnited Airlines
Deal found 7/28$274
This Hawaiian Airlines deal was found by Cheapflights users on 7/28. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/196:35 amBOI - STL
1 stop7h 04mHawaiian Airlines
lun. 9/223:35 pmSTL - BOI
1 stop9h 33mHawaiian Airlines
Deal found 7/28$278

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 julio 29, 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

jue. 10/2

2:16 pm-4:49 am

1 stop13h 33m

Chicago O'Hare Intl

lun. 10/6

8:15 am-8:21 pm

1 stop13h 06m

$211

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

sáb. 10/4

7:13 am-11:59 pm

1 stop15h 46m

Chicago O'Hare Intl

mar. 10/7

6:00 am-2:36 pm

1 stop9h 36m

$214

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

sáb. 9/20

5:25 am-1:03 pm

1 stop6h 38m

Chicago Midway

sáb. 10/4

7:15 pm-11:59 pm

1 stop5h 44m

$215

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

mié. 9/24

4:20 pm-11:55 pm

1 stop6h 35m

Chicago O'Hare Intl

sáb. 10/4

2:25 pm-8:20 pm

1 stop6h 55m

$215

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

mar. 9/23

12:45 pm-10:00 pm

1 stop8h 15m

Chicago Midway

mar. 10/7

7:10 am-1:45 pm

1 stop7h 35m

$235

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

mar. 9/23

12:27 pm-5:00 pm

Nonstop3h 33m

Chicago O'Hare Intl

vie. 9/26

4:05 pm-6:47 pm

Nonstop3h 42m

$235

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

dom. 9/21

12:22 pm-11:59 pm

1 stop10h 37m

Chicago O'Hare Intl

jue. 10/9

6:00 am-11:53 am

1 stop6h 53m

$238

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

mar. 8/19

4:00 pm-11:39 pm

1 stop6h 39m

Chicago O'Hare Intl

mar. 8/26

8:00 am-3:00 pm

1 stop8h 00m

$250

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

mar. 8/26

1:10 pm-5:43 pm

Nonstop3h 33m

Chicago O'Hare Intl

lun. 9/1

9:50 am-12:29 pm

Nonstop3h 39m

$266

BoiseMoline

BOI - MLI

BOIMLI

Boise Air Term. Gowen Fld

sáb. 8/23

1:35 pm-10:48 pm

1 stop8h 13m

Moline Quad-City

mar. 8/26

6:00 am-12:35 pm

1 stop7h 35m

$269

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 46 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 julio 29, 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 julio 29, 2025.

The most flights from BOI to USIL are scheduled on a Tuesday (11 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (8 on average).

How much does it cost to fly round-trip from Boise to Illinois?

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 julio 29, 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

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Southwest
8.0
Very good
4,238 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,977 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Hawaiian Airlines
7.8
Good
2,605 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,899 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Crew

8.5

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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 $77 on Spirit Airlines. Other airlines that offer cheap prices include Frontier from $90 and Hawaiian Airlines from $107 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 (96%), Air Canada (84%) or Lufthansa (84%) 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 $1,316, our data indicates the cheapest price to be $158. The most popular route (Boise Air Term. Gowen Fld - Chicago O'Hare Intl), is priced around $161.

  • 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

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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 julio 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$139Average$317FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$217Average$327FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$233Average$386FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$236Average$538FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$239Average$528FlexibilityNo cancel feeOn-time69%

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