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Boise

$84+ 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 2/26. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Feb 25 — Mar 41
Wed 2/25
Wed 3/4
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 January 26, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/112:03 pm
STL
-
BOI
1 stop24h 09m
Frontier
Fri 2/612:07 pm
BOI
-
STL
1 stop25h 39m
Frontier
Deal found 1/25$188
This Kiwi.com deal was found by Cheapflights users on 1/26. 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.
Wed 3/48:17 pm
STL
-
BOI
2 stops16h 34m
Frontier
Sun 3/812:15 pm
BOI
-
STL
1 stop20h 34m
Frontier
Deal found 1/26$196
This Kiwi.com deal was found by Cheapflights users on 1/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2610:11 pm
STL
-
BOI
2 stops14h 00m
Frontier
Sun 3/111:56 am
BOI
-
STL
1 stop24h 13m
Frontier
Deal found 1/25$197
This Trip.com deal was found by Cheapflights users on 1/25. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/93:07 pm
ORD
-
BOI
1 stop9h 23m
Hawaiian Airlines
Wed 3/188:28 pm
BOI
-
ORD
1 stop9h 11m
Hawaiian Airlines
Deal found 1/25$214
This Alaska Airlines deal was found by Cheapflights users on 1/26. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/76:00 am
ORD
-
BOI
1 stop7h 19m
Alaska Airlines
Wed 4/152:22 pm
BOI
-
ORD
1 stop8h 37m
Alaska Airlines
Deal found 1/26$229
This Kiwi.com deal was found by Cheapflights users on 1/26. 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.
Mon 3/26:00 am
ORD
-
BOI
1 stop11h 47m
Multiple Airlines
Thu 3/512:38 pm
BOI
-
ORD
1 stop9h 36m
Multiple Airlines
Deal found 1/26$232
This United Airlines deal was found by Cheapflights users on 1/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/318:30 am
STL
-
BOI
1 stop9h 18m
United Airlines
Sat 4/42:37 pm
BOI
-
STL
1 stop5h 17m
United Airlines
Deal found 1/26$237
This Expedia deal was found by Cheapflights users on 1/25. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/93:44 pm
ORD
-
BOI
1 stop8h 58m
Multiple Airlines
Thu 2/1212:36 pm
BOI
-
ORD
1 stop22h 22m
Multiple Airlines
Deal found 1/25$240
This CheapOair deal was found by Cheapflights users on 1/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/194:16 pm
ORD
-
BOI
1 stop19h 55m
Frontier
Sun 2/2211:56 am
BOI
-
ORD
1 stop11h 24m
Frontier
Deal found 1/26$246
This Alaska Airlines deal was found by Cheapflights users on 1/26. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/98:00 am
ORD
-
BOI
1 stop8h 29m
Alaska Airlines
Mon 4/138:28 pm
BOI
-
ORD
1 stop9h 11m
Alaska Airlines
Deal found 1/26$249
This Alaska Airlines deal was found by Cheapflights users on 1/26. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/23:52 pm
ORD
-
BOI
1 stop8h 10m
Alaska Airlines
Tue 5/57:43 am
BOI
-
ORD
1 stop10h 20m
Alaska Airlines
Deal found 1/26$259
This Kiwi.com deal was found by Cheapflights users on 1/25. 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 Kiwi.com 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
2 stops26h 06m
Frontier
Deal found 1/25$261

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 January 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$196
(Kiwi.com)

One-way from

$84
(Kiwi.com)

Popular in

November

Cheapest in

September

Average price

$383

Good round-trip deal

$326 or less

Good one-way deal

$254 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. 2% potential increase in price ($10 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 January 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 January 26, 2026.
Use the filters below to find and compare flights from Illinois to Boise that are best for you.

Fly from

Illinois

Fly to

Boise

Route

Depart

Return

Price

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 2/26

10:11 pm-11:11 am

2 stops14h 00m

Boise Air Term. Gowen Fld

Sun 3/1

11:56 am-1:09 pm

1 stop24h 13m

$197

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Tue 4/7

6:00 am-12:19 pm

1 stop7h 19m

Boise Air Term. Gowen Fld

Tue 4/14

2:22 pm-11:59 pm

1 stop8h 37m

$229

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Tue 4/7

6:00 am-12:19 pm

1 stop7h 19m

Boise Air Term. Gowen Fld

Mon 4/13

8:28 pm-6:39 am

1 stop9h 11m

$229

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Wed 3/11

7:40 pm-10:56 pm

Nonstop4h 16m

Boise Air Term. Gowen Fld

Wed 3/18

7:47 am-12:32 pm

Nonstop3h 45m

$249

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Wed 4/1

3:22 pm-11:56 pm

1 stop9h 34m

Boise Air Term. Gowen Fld

Mon 4/6

8:28 pm-6:39 am

1 stop9h 11m

$249

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Thu 3/12

7:00 am-3:08 pm

1 stop9h 08m

Boise Air Term. Gowen Fld

Tue 3/31

2:22 pm-11:59 pm

1 stop8h 37m

$249

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Sat 3/14

4:08 pm-9:34 pm

1 stop6h 26m

Boise Air Term. Gowen Fld

Wed 3/18

7:47 am-12:32 pm

Nonstop3h 45m

$259

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Tue 2/17

9:15 am-12:33 pm

Nonstop4h 18m

Boise Air Term. Gowen Fld

Tue 2/24

6:25 am-2:50 pm

1 stop7h 25m

$259

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Sun 3/1

3:07 pm-11:30 pm

1 stop9h 23m

Boise Air Term. Gowen Fld

Wed 3/4

7:00 am-11:59 pm

1 stop15h 59m

$259

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Wed 4/8

9:30 am-2:05 pm

1 stop5h 35m

Boise Air Term. Gowen Fld

Tue 4/14

2:18 pm-10:28 pm

1 stop7h 10m

$269

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/23

Showing 1-10 of 60 results
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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 $149). Flying from Illinois to Boise in December is currently the most expensive (average of $288). 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 January 26, 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 19% 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 January 26, 2026.

The most flights from USIL to BOI are scheduled on a Monday (6 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (5 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 4h 16m. There are 1432 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?

    $87 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on Southwest and American Airlines, with prices starting from $87 and $104, 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: Lufthansa (100%), Air Canada (69%), United Airlines (62%).

  • What are the cheapest flights from Illinois to Boise?

    While on average a flight from Illinois to Boise is generally $427, our data shows the cheapest flight currently is $253. When looking at the most popular route, (Chicago O'Hare Intl - Boise Air Term. Gowen Fld), you can expect to pay $240 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 $149). Flying from Illinois to Boise in December is currently the most expensive (average of $288). 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 January 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$174Average$272FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$214Average$470FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$237Average$451FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$254Average$339FlexibilityNo cancel feeOn-time63%

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