HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Boise

$92+ 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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Apr 22 — Apr 291
Wed 4/22
Wed 4/29
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Boise 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 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 March 23, 2026.

This CheapOair deal was found by Cheapflights users on 3/20. 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 4/18:16 pm
STL
-
BOI
1 stop15h 52m
Frontier
Sun 4/512:03 pm
BOI
-
STL
1 stop20h 45m
Frontier
Deal found 3/20$237
This CheapOair deal was found by Cheapflights users on 3/18. 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.
Wed 4/83:29 pm
ORD
-
BOI
1 stop20h 39m
Frontier
Sun 4/1212:03 pm
BOI
-
ORD
1 stop24h 16m
Frontier
Deal found 3/18$261
This SmartFares deal was found by Cheapflights users on 3/22. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/26:00 am
ORD
-
BOI
1 stop7h 35m
Alaska Airlines
Sat 5/92:57 pm
BOI
-
ORD
1 stop8h 02m
Alaska Airlines
Deal found 3/22$265
This Expedia deal was found by Cheapflights users on 3/18. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/58:00 am
ORD
-
BOI
1 stop8h 33m
Multiple Airlines
Sun 5/101:22 pm
BOI
-
ORD
1 stop6h 15m
Multiple Airlines
Deal found 3/18$273
This Kiwi.com deal was found by Cheapflights users on 3/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/44:28 pm
ORD
-
BOI
2 stops20h 59m
Frontier
Tue 5/121:22 pm
BOI
-
ORD
1 stop6h 15m
Frontier
Deal found 3/20$275
This CheapOair deal was found by Cheapflights users on 3/20. 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 7/89:48 pm
ORD
-
BOI
1 stop15h 21m
Frontier
Thu 7/161:04 pm
BOI
-
ORD
1 stop6h 49m
Frontier
Deal found 3/20$281
This Kiwi.com deal was found by Cheapflights users on 3/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/99:42 pm
ORD
-
BOI
1 stop15h 45m
Frontier
Tue 5/121:22 pm
BOI
-
ORD
1 stop6h 15m
Frontier
Deal found 3/20$287
This Alaska Airlines deal was found by Cheapflights users on 3/22. 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.
Sat 5/26:00 am
ORD
-
BOI
1 stop7h 35m
Alaska Airlines
Tue 5/512:15 pm
BOI
-
ORD
1 stop10h 44m
Alaska Airlines
Deal found 3/22$295
This Alaska Airlines deal was found by Cheapflights users on 3/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/154:10 pm
ORD
-
BOI
1 stop8h 37m
Alaska Airlines
Wed 4/222:57 pm
BOI
-
ORD
1 stop8h 02m
Alaska Airlines
Deal found 3/19$300
This Kiwi.com deal was found by Cheapflights users on 3/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/44:28 pm
ORD
-
BOI
2 stops20h 59m
Frontier
Thu 5/71:22 pm
BOI
-
ORD
1 stop6h 15m
Frontier
Deal found 3/20$301
This Alaska Airlines deal was found by Cheapflights users on 3/17. 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 10/312:54 pm
ORD
-
BOI
1 stop9h 19m
Alaska Airlines
Tue 11/36:00 am
BOI
-
ORD
1 stop7h 12m
Alaska Airlines
Deal found 3/17$305
This Alaska Airlines deal was found by Cheapflights users on 3/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/298:00 am
ORD
-
BOI
1 stop6h 52m
Alaska Airlines
Mon 5/42:57 pm
BOI
-
ORD
1 stop8h 02m
Alaska Airlines
Deal found 3/19$310

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 March 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$248
(Southwest)

One-way from

$92
(CheapOair)

Popular in

June

Cheapest in

February

Average price

$397

Good round-trip deal

$329 or less

Good one-way deal

$259 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. 6% potential increase in price ($25 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 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

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Wed 4/29

6:00 am-1:52 pm

1 stop8h 52m

Boise Air Term. Gowen Fld

Sat 5/2

2:57 pm-11:59 pm

1 stop8h 02m

$295

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Wed 4/15

4:10 pm-11:47 pm

1 stop8h 37m

Boise Air Term. Gowen Fld

Wed 4/22

2:57 pm-11:59 pm

1 stop8h 02m

$300

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Thu 4/30

3:52 pm-11:02 pm

1 stop8h 10m

Boise Air Term. Gowen Fld

Sat 5/2

2:57 pm-11:59 pm

1 stop8h 02m

$310

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Thu 4/30

3:52 pm-11:02 pm

1 stop8h 10m

Boise Air Term. Gowen Fld

Mon 5/4

2:57 pm-11:59 pm

1 stop8h 02m

$325

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 4/7

7:00 am-1:58 pm

1 stop7h 58m

Boise Air Term. Gowen Fld

Wed 4/8

2:22 pm-11:59 pm

1 stop8h 37m

$337

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Wed 4/29

9:29 am-2:26 pm

1 stop5h 57m

Boise Air Term. Gowen Fld

Sat 5/2

6:00 am-6:36 pm

2 stops11h 36m

$340

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Sat 4/11

6:00 am-12:22 pm

1 stop7h 22m

Boise Air Term. Gowen Fld

Tue 4/14

6:32 am-6:40 pm

1 stop11h 08m

$344

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Sat 5/16

9:22 am-5:50 pm

2 stops9h 28m

Boise Air Term. Gowen Fld

Tue 5/26

9:16 pm-8:42 am

2 stops10h 26m

$345

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Wed 4/15

2:09 pm-12:17 am

2 stops11h 08m

Boise Air Term. Gowen Fld

Wed 4/22

7:24 am-4:39 pm

1 stop8h 15m

$345

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Sat 5/16

5:41 pm-11:46 pm

1 stop7h 05m

Boise Air Term. Gowen Fld

Tue 5/26

11:39 pm-8:39 am

1 stop8h 00m

$345

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/19

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

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 $158). Flying from Illinois to Boise in March is currently the most expensive (average of $383). 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 March 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 afternoon tend to be the most expensive. A flight at noon could potentially save you up to 25% 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 March 23, 2026.

The most flights from USIL to BOI are scheduled on a Monday (6 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (6 on average).

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 57m. 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?

    $77 is the cheapest one-way deal found within the past few days, from Alaska Airlines. You may also be able to find cheap deals on Southwest and Delta, with prices starting from $87 and $87, 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 Chicago Midway - Boise Air Term. Gowen Fld or Lambert-St Louis - 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 (66%), Envoy Air (66%), Air Canada (59%).

  • What are the cheapest flights from Illinois to Boise?

    While on average a flight from Illinois to Boise is generally $346, our data shows the cheapest flight currently is $189. When looking at the most popular route, (Chicago O'Hare Intl - Boise Air Term. Gowen Fld), you can expect to pay $293 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 $158). Flying from Illinois to Boise in March is currently the most expensive (average of $383). 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
Ontario
Meridian
Nampa
Caldwell
McCall

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.

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 March 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$174Average$295FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$237Average$462FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$254Average$378FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$255Average$468FlexibilityNo cancel feeOn-time71%

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.
Site
©2026 Cheapflights