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$116+ 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 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Jun 10 — Jun 171
Wed 6/10
Wed 6/17
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 May 11, 2026.

This CheapOair deal was found by Cheapflights users on 5/10. 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 6/178:08 pm
STL
-
BOI
1 stop17h 22m
Frontier
Sun 6/211:25 pm
BOI
-
STL
1 stop28h 28m
Frontier
Deal found 5/10$240
This CheapOair deal was found by Cheapflights users on 5/10. 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 6/88:08 pm
STL
-
BOI
1 stop17h 22m
Frontier
Sun 6/141:25 pm
BOI
-
STL
1 stop28h 28m
Frontier
Deal found 5/10$280
This Expedia deal was found by Cheapflights users on 5/6. 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 8/273:00 pm
STL
-
BOI
1 stop8h 33m
Multiple Airlines
Tue 9/11:04 pm
BOI
-
STL
1 stop5h 19m
Multiple Airlines
Deal found 5/6$328
This Southwest deal was found by Cheapflights users on 5/8. 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.
Wed 7/155:25 am
MDW
-
BOI
1 stop6h 40m
Southwest
Tue 7/213:00 pm
BOI
-
MDW
1 stop7h 35m
Southwest
Deal found 5/8$335
This American Airlines deal was found by Cheapflights users on 5/10. 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.
Wed 7/157:00 am
ORD
-
BOI
1 stop8h 47m
American Airlines
Tue 7/216:20 am
BOI
-
ORD
1 stop8h 31m
American Airlines
Deal found 5/10$335
This American Airlines deal was found by Cheapflights users on 5/10. 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 7/46:04 am
ORD
-
BOI
1 stop9h 43m
American Airlines
Sat 7/113:53 pm
BOI
-
ORD
1 stop7h 57m
American Airlines
Deal found 5/10$336
This flugladen.de deal was found by Cheapflights users on 5/7. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/286:00 am
ORD
-
BOI
1 stop7h 35m
Alaska Airlines
Wed 9/161:29 pm
BOI
-
ORD
1 stop9h 12m
Alaska Airlines
Deal found 5/7$339
This Delta deal was found by Cheapflights users on 5/9. 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.
Sun 5/249:23 am
MDW
-
BOI
2 stops9h 27m
Delta
Wed 5/275:20 am
BOI
-
MDW
1 stop6h 59m
Delta
Deal found 5/9$340
This Delta deal was found by Cheapflights users on 5/9. 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.
Thu 5/287:12 am
ORD
-
BOI
1 stop8h 31m
Delta
Fri 5/299:16 pm
BOI
-
ORD
2 stops10h 20m
Delta
Deal found 5/9$340
This American Airlines deal was found by Cheapflights users on 5/9. 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 6/611:30 am
ORD
-
BOI
Nonstop3h 52m
American Airlines
Sat 6/133:12 pm
BOI
-
ORD
Nonstop3h 47m
American Airlines
Deal found 5/9$344
This Travelocity deal was found by Cheapflights users on 5/10. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/273:00 pm
STL
-
BOI
1 stop8h 33m
Multiple Airlines
Thu 9/31:04 pm
BOI
-
STL
1 stop5h 19m
Multiple Airlines
Deal found 5/10$344
This Delta deal was found by Cheapflights users on 5/10. 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.
Fri 5/296:23 am
MDW
-
BOI
1 stop7h 20m
Delta
Tue 6/211:39 pm
BOI
-
MDW
1 stop9h 21m
Delta
Deal found 5/10$345

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 May 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$240
(CheapOair)

One-way from

$116
(CheapOair)

Popular in

November

Cheapest in

February

Average price

$409

Good round-trip deal

$375 or less

Good one-way deal

$222 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. 5% potential increase in price ($22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 11, 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 7/15

6:04 am-2:47 pm

1 stop9h 43m

Boise Air Term. Gowen Fld

Tue 7/21

12:14 pm-10:15 pm

1 stop9h 01m

$335

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Thu 5/28

6:25 pm-12:45 am

1 stop7h 20m

Boise Air Term. Gowen Fld

Sat 6/6

6:00 pm-5:10 am

1 stop10h 10m

$340

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Wed 7/15

1:18 pm-11:46 pm

2 stops11h 28m

Boise Air Term. Gowen Fld

Tue 7/21

10:29 am-6:18 pm

1 stop6h 49m

$360

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Tue 8/18

1:48 pm-11:59 pm

2 stops11h 11m

Boise Air Term. Gowen Fld

Wed 8/26

11:12 am-6:19 pm

1 stop6h 07m

$360

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Wed 7/15

2:07 pm-11:46 pm

2 stops10h 39m

Boise Air Term. Gowen Fld

Tue 7/21

1:05 pm-9:48 pm

1 stop7h 43m

$360

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Thu 5/28

5:44 pm-11:58 pm

1 stop7h 14m

Boise Air Term. Gowen Fld

Mon 6/1

6:07 pm-6:20 am

1 stop11h 13m

$364

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Thu 5/28

7:13 pm-11:46 pm

1 stop5h 33m

Boise Air Term. Gowen Fld

Mon 6/1

11:39 pm-10:00 am

1 stop9h 21m

$364

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Sat 7/4

6:10 am-11:30 am

1 stop6h 20m

Boise Air Term. Gowen Fld

Sat 7/11

10:25 am-6:15 pm

1 stop6h 50m

$365

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Wed 5/27

9:23 am-5:50 pm

2 stops9h 27m

Boise Air Term. Gowen Fld

Sat 5/30

5:20 am-1:19 pm

1 stop6h 59m

$369

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Fri 7/3

1:46 pm-10:35 pm

1 stop9h 49m

Boise Air Term. Gowen Fld

Mon 7/6

7:53 pm-8:30 am

2 stops11h 37m

$375

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/9

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

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

The best time to book flights from Illinois to Boise is 70 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.

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

Currently, May is the cheapest month in which you can book a flight from Illinois to Boise (average of $87). Flying from Illinois to Boise 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 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 May 11, 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 May 11, 2026.

The most flights from USIL to BOI 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 (3 on average).

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

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 7h 20m. 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 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: SkyWest Airlines (76%), American Airlines (75%), Envoy Air (75%).

  • What are the cheapest flights from Illinois to Boise?

    While on average a flight from Illinois to Boise is generally $339, our data shows the cheapest flight currently is $172. When looking at the most popular route, (Chicago O'Hare Intl - Boise Air Term. Gowen Fld), you can expect to pay $259 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, May is the cheapest month in which you can book a flight from Illinois to Boise (average of $87). Flying from Illinois to Boise 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.

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

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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 May 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$174Average$313FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$254Average$378FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$256Average$493FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$268Average$443FlexibilityNo cancel feeOn-time71%

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