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$66+ 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 12/11. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ORD
nov. 26 — dic. 31
mié. 11/26
mié. 12/3
1 adult, Economy
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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 octubre 27, 2025.

This Frontier deal was found by Cheapflights users on 10/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/412:44 pmBOI - STL
1 stop20h 30mFrontier
mié. 12/107:43 pmSTL - BOI
1 stop17h 06mFrontier
Deal found 10/27$131
This Kiwi.com deal was found by Cheapflights users on 10/24. 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.
jue. 12/412:44 pmBOI - STL
1 stop20h 30mFrontier
vie. 12/1210:44 pmSTL - BOI
2 stops38h 05mFrontier
Deal found 10/24$268
This Delta deal was found by Cheapflights users on 10/27. 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.
jue. 12/47:30 amBOI - STL
2 stops10h 40mDelta
mié. 12/1012:49 pmSTL - BOI
2 stops8h 31mDelta
Deal found 10/27$284
This Southwest deal was found by Cheapflights users on 10/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/1311:45 amBOI - MDW
1 stop7h 25mSouthwest
jue. 12/186:25 pmMDW - BOI
2 stops7h 10mSouthwest
Deal found 10/27$294
This Delta deal was found by Cheapflights users on 10/25. 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.
jue. 11/137:45 pmBOI - ORD
2 stops11h 45mDelta
dom. 11/167:40 pmORD - BOI
1 stop5h 55mDelta
Deal found 10/25$294
This American Airlines deal was found by Cheapflights users on 10/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/141:25 pmBOI - MLI
1 stop8h 38mAmerican Airlines
mar. 11/185:46 amMLI - BOI
1 stop7h 49mAmerican Airlines
Deal found 10/27$294
This American Airlines deal was found by Cheapflights users on 10/25. 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.
sáb. 11/11:33 pmBOI - ORD
1 stop9h 09mAmerican Airlines
sáb. 11/159:55 amORD - BOI
Nonstop4h 11mAmerican Airlines
Deal found 10/25$296
This Frontier deal was found by Cheapflights users on 10/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/1212:44 pmBOI - ORD
1 stop10h 28mFrontier
jue. 12/257:00 amORD - BOI
1 stop5h 43mFrontier
Deal found 10/26$298
This United Airlines deal was found by Cheapflights users on 10/27. 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. 11/135:00 amBOI - ORD
1 stop5h 23mUnited Airlines
dom. 11/168:45 amORD - BOI
Nonstop3h 54mUnited Airlines
Deal found 10/27$299
This United Airlines deal was found by Cheapflights users on 10/27. 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.
vie. 11/142:31 pmBOI - MLI
1 stop5h 30mUnited Airlines
mar. 11/181:00 pmMLI - BOI
2 stops11h 28mUnited Airlines
Deal found 10/27$299
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/1312:33 pmBOI - ORD
2 stops34h 11mFrontier
dom. 11/166:00 amORD - BOI
1 stop6h 43mFrontier
Deal found 10/27$301
This Kiwi.com deal was found by Cheapflights users on 10/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/1212:44 pmBOI - ORD
1 stop10h 28mMultiple Airlines
jue. 12/2512:39 pmORD - BOI
2 stops27h 25mMultiple Airlines
Deal found 10/26$302

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 octubre 27, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$131
(Frontier)

One-way from

$66
(Trip.com)

Popular in

December

Cheapest in

February

Average price

$407

Good round-trip deal

$352 or less

Good one-way deal

$273 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. 4% potential increase in price ($19 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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

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 octubre 27, 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

jue. 12/4

12:44 pm-10:14 am

1 stop20h 30m

Lambert-St Louis

mié. 12/10

7:43 pm-11:49 am

1 stop17h 06m

$131

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

jue. 12/4

12:44 pm-10:14 am

1 stop20h 30m

Lambert-St Louis

vie. 12/12

10:44 pm-11:49 am

2 stops38h 05m

$268

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

jue. 12/4

7:30 am-7:10 pm

2 stops10h 40m

Lambert-St Louis

mié. 12/10

12:49 pm-8:20 pm

2 stops8h 31m

$284

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

sáb. 12/13

6:00 am-1:30 pm

1 stop6h 30m

Chicago O'Hare Intl

jue. 12/18

1:00 pm-12:45 am

1 stop12h 45m

$294

BoiseMoline

BOI - MLI

BOIMLI

Boise Air Term. Gowen Fld

vie. 11/14

1:25 pm-11:03 pm

1 stop8h 38m

Moline Quad-City

mar. 11/18

5:46 am-12:35 pm

1 stop7h 49m

$294

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

vie. 11/14

9:00 am-9:25 pm

2 stops11h 25m

Chicago O'Hare Intl

dom. 11/16

7:40 pm-12:35 am

1 stop5h 55m

$294

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

jue. 11/13

7:45 pm-8:30 am

2 stops11h 45m

Chicago O'Hare Intl

dom. 11/16

7:40 pm-12:35 am

1 stop5h 55m

$294

BoiseMoline

BOI - MLI

BOIMLI

Boise Air Term. Gowen Fld

vie. 11/14

2:31 pm-9:01 pm

1 stop5h 30m

Moline Quad-City

mar. 11/18

1:00 pm-11:28 pm

2 stops11h 28m

$299

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

mar. 12/9

5:45 am-1:09 pm

1 stop6h 24m

Chicago O'Hare Intl

jue. 12/25

6:00 am-1:49 pm

1 stop8h 49m

$306

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

sáb. 12/13

1:50 pm-10:45 pm

1 stop7h 55m

Chicago Midway

jue. 12/18

6:35 pm-12:35 am

1 stop7h 00m

$307

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/25

Showing 1-10 of 60 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, May is the cheapest month in which you can book a flight from Boise to Illinois (average of $87). Flying from Boise to Illinois in March is currently the most expensive (average of $268). 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 octubre 27, 2025.

When flying from Boise to Illinois, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 28% versus a flight in the morning.

What is the cheapest day to fly from Boise to Illinois?

Use this chart to determine the cheapest time to fly round-trip from Boise to Illinois. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Boise to Illinois flight should consider departing on Monday evenings when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 octubre 27, 2025.

The most flights from BOI to USIL are scheduled on a Monday (8 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 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 octubre 27, 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
11,197 reviews

Food

7.1

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Alaska Airlines
8.0
Very good
11,197 reviews
Alaska Airlines
8.0
Very good
11,197 reviews

Food

7.1

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Southwest
8.0
Very good
4,236 reviews
Alaska Airlines
8.0
Very good
11,197 reviews

Food

7.1

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Delta
7.9
Good
7,996 reviews
Alaska Airlines
8.0
Very good
11,197 reviews

Food

7.1

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
United Airlines
7.4
Good
8,997 reviews
Alaska Airlines
8.0
Very good
11,197 reviews

Food

7.1

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
American Airlines
7.2
Good
11,033 reviews
Alaska Airlines
8.0
Very good
11,197 reviews

Food

7.1

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.

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?

    Frontier, Delta, and Southwest can get you from Boise to Illinois in just under 6h 30m. Your travel time can differ by up to 14h. The distance between Boise and Illinois is about 1432 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 $75 on Frontier. Other airlines that offer cheap prices include Alaska Airlines from $114 and Southwest from $135 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 SkyWest Airlines (97%), Lufthansa (83%) or Emirates (77%) 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 $919, our data indicates the cheapest price to be $119. The most popular route (Boise Air Term. Gowen Fld - Chicago O'Hare Intl), is priced around $204.

  • 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, May is the cheapest month in which you can book a flight from Boise to Illinois (average of $87). Flying from Boise to Illinois in March is currently the most expensive (average of $268). 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 octubre 27, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$139Average$276FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$217Average$353FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$233Average$393FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$233Average$486FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$255Average$499FlexibilityNo cancel feeOn-time71%

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