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$132+ Cheap flights from Illinois to Boise (BOI)

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 7/15. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Jul 23 — Jul 301
Thu 7/23
Thu 7/30
1 adult, Economy
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Cheap flight deals from Illinois to Boise

Cheapest flights from Illinois to Boise
Explore the most affordable flight options available from Illinois to Boise. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 23, 2026.

This CheapOair deal was found by Cheapflights users on 6/18. 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.
Thu 9/1012:46 pm
STL
-
BOI
1 stop27h 11m
Frontier
Mon 9/143:52 pm
BOI
-
STL
1 stop18h 59m
Frontier
Deal found 6/18$284
This CheapOair deal was found by Cheapflights users on 6/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/298:08 pm
STL
-
BOI
1 stop17h 21m
Frontier
Sun 8/21:24 pm
BOI
-
STL
1 stop4h 59m
Frontier
Deal found 6/20$286
This CheapOair deal was found by Cheapflights users on 6/22. 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.
Thu 9/2412:46 pm
STL
-
BOI
1 stop27h 11m
Frontier
Sun 9/2712:59 pm
BOI
-
STL
1 stop5h 16m
Frontier
Deal found 6/22$301
This CheapOair deal was found by Cheapflights users on 6/21. 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.
Mon 7/278:08 pm
STL
-
BOI
1 stop17h 21m
Frontier
Sun 8/21:24 pm
BOI
-
STL
1 stop4h 59m
Frontier
Deal found 6/21$318
This American Airlines deal was found by Cheapflights users on 6/20. 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.
Sat 10/176:26 am
BMI
-
BOI
1 stop7h 06m
American Airlines
Thu 10/222:57 pm
BOI
-
BMI
1 stop7h 05m
American Airlines
Deal found 6/20$329
This American Airlines deal was found by Cheapflights users on 6/21. 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.
Tue 9/2211:35 am
ORD
-
BOI
Nonstop3h 56m
American Airlines
Tue 9/293:21 pm
BOI
-
ORD
Nonstop3h 55m
American Airlines
Deal found 6/21$335
This American Airlines deal was found by Cheapflights users on 6/22. 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.
Sat 8/111:32 am
ORD
-
BOI
Nonstop3h 50m
American Airlines
Sat 8/82:58 pm
BOI
-
ORD
Nonstop3h 51m
American Airlines
Deal found 6/22$336
This Expedia deal was found by Cheapflights users on 6/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/67:56 pm
STL
-
BOI
1 stop14h 41m
Multiple Airlines
Tue 8/111:24 pm
BOI
-
STL
1 stop4h 59m
Multiple Airlines
Deal found 6/17$337
This Kiwi.com deal was found by Cheapflights users on 6/22. 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.
Mon 8/312:41 pm
ORD
-
BOI
1 stop22h 48m
Frontier
Thu 9/1012:59 pm
BOI
-
ORD
1 stop7h 36m
Frontier
Deal found 6/22$338
This Alaska Airlines deal was found by Cheapflights users on 6/17. 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.
Sat 8/296:01 am
ORD
-
BOI
1 stop9h 01m
Alaska Airlines
Tue 9/14:20 pm
BOI
-
ORD
1 stop6h 39m
Alaska Airlines
Deal found 6/17$340
This Trip.com deal was found by Cheapflights users on 6/22. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/243:43 pm
ORD
-
BOI
1 stop7h 50m
Alaska Airlines
Sat 8/294:20 pm
BOI
-
ORD
1 stop6h 39m
Alaska Airlines
Deal found 6/22$342
This Alaska Airlines deal was found by Cheapflights users on 6/22. 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.
Tue 8/118:02 am
ORD
-
BOI
1 stop7h 05m
Alaska Airlines
Mon 8/247:48 pm
BOI
-
ORD
1 stop9h 32m
Alaska Airlines
Deal found 6/22$344

Find flight deals from Illinois to Boise

Keep the following information in mind while searching for Illinois to Boise flight deals. Data was last updated June 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$284
(CheapOair)

One-way from

$132
(Mytrip)

Popular in

June

Cheapest in

February

Average price

$469

Good round-trip deal

$370 or less

Good one-way deal

$243 or less
Provider with most accurate pricing for Chicago (CHI)-Boise Air Term. Gowen Fld flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Boise Air Term. Gowen Fld flights.
Search Deals
From Illinois to Boise Air Term. Gowen Fld
Search Deals
One-way flight from Illinois to Boise Air Term. Gowen Fld
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($53 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 June 2026
Search Deals
Price to beat on a round-trip flight from Illinois to Boise Air Term. Gowen Fld.
Search Deals
Price to beat on a one-way flight from Illinois to Boise Air Term. Gowen Fld.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Boise 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 June 23, 2026.
Use the filters below to find and compare flights from Illinois to Boise that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BloomingtonBoise

BMI - BOI

BMIBOI

Bloomington-Normal

Sat 10/17

6:26 am-12:32 pm

1 stop7h 06m

Boise Air Term. Gowen Fld

Thu 10/22

2:57 pm-11:02 pm

1 stop7h 05m

$329

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Sat 8/1

1:49 pm-9:02 pm

1 stop8h 13m

Boise Air Term. Gowen Fld

Sat 8/8

5:30 am-1:10 pm

1 stop6h 40m

$355

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Wed 8/26

6:40 am-10:55 am

1 stop5h 15m

Boise Air Term. Gowen Fld

Wed 9/2

2:25 pm-10:50 pm

1 stop7h 25m

$355

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Tue 11/24

12:30 pm-8:17 pm

2 stops8h 47m

Boise Air Term. Gowen Fld

Tue 12/1

5:40 am-11:51 am

1 stop5h 11m

$360

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Tue 7/21

2:02 pm-10:18 pm

2 stops9h 16m

Boise Air Term. Gowen Fld

Sat 7/25

6:00 am-12:00 pm

1 stop5h 00m

$360

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Sat 8/15

7:48 am-6:48 pm

2 stops12h 00m

Boise Air Term. Gowen Fld

Wed 8/19

3:29 pm-11:29 pm

1 stop7h 00m

$360

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Fri 7/24

7:40 pm-12:05 am

1 stop5h 25m

Boise Air Term. Gowen Fld

Tue 7/28

2:50 pm-9:52 pm

1 stop6h 02m

$385

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 8/25

6:35 am-2:22 pm

1 stop8h 47m

Boise Air Term. Gowen Fld

Wed 8/26

6:23 am-2:06 pm

1 stop6h 43m

$388

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Wed 8/12

3:15 pm-11:20 pm

1 stop9h 05m

Boise Air Term. Gowen Fld

Mon 8/17

10:50 am-8:15 pm

2 stops8h 25m

$390

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Tue 9/1

6:40 am-1:40 pm

2 stops8h 00m

Boise Air Term. Gowen Fld

Fri 9/4

7:50 pm-5:45 am

1 stop8h 55m

$390

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/21

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Illinois to Boise

Have a flexible travel schedule? Discover the best time to fly to Boise from Illinois 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 Illinois to Boise

What is the cheapest month to book a flight from Illinois to Boise?

Currently, July is the cheapest month in which you can book a flight from Illinois to Boise (average of $91). Flying from Illinois to Boise in June is currently the most expensive (average of $279). 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 IL to BOI?

Find hourly flight availability from Illinois to Boise. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 23, 2026.

One of the essential ways to save on airfare from Illinois to Boise is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight at noon could potentially save you up to 26% on airfare.

Weekly flight availability from Illinois to Boise

Explore weekly flight availability from Illinois to Boise. 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 June 23, 2026.

The most flights from USIL to BOI are scheduled on a Monday (7 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (5 on average).

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

How far ahead should I book a flight from Illinois to Boise?

The best time to book flights from Illinois to Boise is 62 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Boise. 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 into for flights to Boise from Illinois?

    Boise Air Term. Gowen Fld (BOI), located 3.3 mi from the city center, is the airport you fly into when you book flights from Illinois to Boise.

  • How long is the flight from Illinois to Boise?

    Departing from Illinois to Boise will take you 5h 15m. There are 1444 mi between Illinois and Boise. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Illinois to Boise one-way?

    $85 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on Alaska Airlines and American Airlines, with prices starting from $114 and $117, respectively.

  • What are the most popular routes from Illinois to Boise?

    The most popular route from Illinois to Boise is Chicago O'Hare Intl - Boise Air Term. Gowen Fld. You may also consider Lambert-St Louis - Boise Air Term. Gowen Fld or Chicago Midway - Boise Air Term. Gowen Fld.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Illinois to Boise on time: American Airlines (82%), Air Canada (73%), United Airlines (62%).

  • What are the cheapest flights from Illinois to Boise?

    While on average a flight from Illinois to Boise is generally $350, our data shows the cheapest flight currently is $197. When looking at the most popular route, (Chicago O'Hare Intl - Boise Air Term. Gowen Fld), you can expect to pay $296 for that flight.

  • Can I find deals for flights from Illinois to Boise that include hotel bookings?

    Yes. In addition to deals on Illinois to Boise flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Boise?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Boise.

  • Can I find deals for business class flights from Illinois to Boise?

    Yes. Cheapflights offers flight deals from Illinois to Boise 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 Illinois to Boise?

    Currently, July is the cheapest month in which you can book a flight from Illinois to Boise (average of $91). Flying from Illinois to Boise in June is currently the most expensive (average of $279). 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

Traveling to a place near Boise?

Book flights to Boise if you plan to visit one of these locations
Meridian
Nampa
Caldwell
Ontario
McCall

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Top 4 airlines flying from Illinois to Boise

Discover the top 4 airlines that operate flights from Illinois to Boise. 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 June 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$263Average$526FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$268Average$461FlexibilityNo cancel feeOn-time71%
DeltaCheapest$268Average$406FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$288Average$439FlexibilityNo cancel feeOn-time63%

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