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$77+ 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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
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Cheap flight deals from Illinois to Boise

Keep the following information in mind while searching for Illinois to Boise flight deals. Data was last updated July 30, 2025.

Round-trip from

$224
(Alaska Airlines)

One-way from

$77
(Booking.com)

Popular in

November

Cheapest in

September

Average price

$423

Good round-trip deal

$275 or less

Good one-way deal

$187 or less
From Illinois to Boise Air Term. Gowen Fld
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One-way flight from Illinois to Boise Air Term. Gowen Fld
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Highest demand for flights based on searches. 13% potential increase in price ($62 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Illinois to Boise Air Term. Gowen Fld.
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Price to beat on a one-way flight from Illinois to Boise Air Term. Gowen Fld.
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Find 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 July 30, 2025.

This Alaska Airlines deal was found by Cheapflights users on 7/28. 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 9/2712:05 pmORD - BOI
1 stop7h 11mAlaska Airlines
Mon 9/298:46 pmBOI - ORD
1 stop9h 17mAlaska Airlines
Deal found 7/28$224
This Delta deal was found by Cheapflights users on 7/28. 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.
Wed 9/179:20 amMDW - BOI
1 stop5h 55mDelta
Sun 9/215:25 amBOI - MDW
1 stop6h 38mDelta
Deal found 7/28$225
This United Airlines deal was found by Cheapflights users on 7/28. 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.
Sat 9/208:45 amORD - BOI
Nonstop3h 46mUnited Airlines
Sat 9/272:12 pmBOI - ORD
1 stop8h 03mUnited Airlines
Deal found 7/28$225
This CheapOair deal was found by Cheapflights users on 7/28. 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 8/145:40 amORD - BOI
1 stop7h 06mMultiple Airlines
Thu 8/216:06 pmBOI - ORD
1 stop9h 44mMultiple Airlines
Deal found 7/28$232
This Hawaiian Airlines deal was found by Cheapflights users on 7/27. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/268:00 amORD - BOI
1 stop8h 00mHawaiian Airlines
Mon 9/298:46 pmBOI - ORD
1 stop9h 17mHawaiian Airlines
Deal found 7/27$234
This FlightHub deal was found by Cheapflights users on 7/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/177:55 pmSTL - BOI
1 stop16h 42mFrontier
Sun 9/2112:22 pmBOI - STL
1 stop19h 44mFrontier
Deal found 7/29$235
This FlightHub deal was found by Cheapflights users on 7/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/208:25 amORD - BOI
1 stop28h 12mFrontier
Sun 10/1212:48 pmBOI - ORD
1 stop10h 05mFrontier
Deal found 7/28$235
This Southwest deal was found by Cheapflights users on 7/28. 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 9/174:35 pmMDW - BOI
1 stop6h 50mSouthwest
Sun 9/213:20 pmBOI - MDW
Nonstop3h 20mSouthwest
Deal found 7/28$245
This Delta deal was found by Cheapflights users on 7/28. 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.
Wed 9/107:15 amORD - BOI
1 stop6h 51mDelta
Sun 9/145:45 amBOI - ORD
1 stop6h 35mDelta
Deal found 7/28$245
This FlightHub deal was found by Cheapflights users on 7/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1712:06 pmORD - BOI
1 stop8h 57mSpirit Airlines
Mon 10/208:58 pmBOI - ORD
1 stop13h 38mSpirit Airlines
Deal found 7/27$259
This Delta deal was found by Cheapflights users on 7/29. 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.
Tue 9/92:25 pmSTL - BOI
2 stops9h 07mDelta
Sat 9/139:00 amBOI - STL
2 stops11h 21mDelta
Deal found 7/29$274
This American Airlines deal was found by Cheapflights users on 7/28. 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 8/239:50 amORD - BOI
Nonstop3h 39mAmerican Airlines
Sat 8/301:10 pmBOI - ORD
Nonstop3h 33mAmerican Airlines
Deal found 7/28$275

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 July 30, 2025.
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

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Sat 9/27

12:05 pm-6:16 pm

1 stop7h 11m

Boise Air Term. Gowen Fld

Mon 9/29

8:46 pm-7:03 am

1 stop9h 17m

$224

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Wed 9/17

9:20 am-2:15 pm

1 stop5h 55m

Boise Air Term. Gowen Fld

Sun 9/21

5:25 am-1:03 pm

1 stop6h 38m

$225

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Sat 9/20

2:25 pm-8:20 pm

1 stop6h 55m

Boise Air Term. Gowen Fld

Sun 10/12

5:40 am-1:28 pm

1 stop6h 48m

$225

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Thu 8/14

5:40 am-11:46 am

1 stop7h 06m

Boise Air Term. Gowen Fld

Thu 8/21

6:06 pm-4:50 am

1 stop9h 44m

$232

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Fri 9/26

8:00 am-3:00 pm

1 stop8h 00m

Boise Air Term. Gowen Fld

Mon 9/29

8:46 pm-7:03 am

1 stop9h 17m

$234

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Sat 9/20

8:25 am-11:37 am

1 stop28h 12m

Boise Air Term. Gowen Fld

Sun 10/12

12:48 pm-11:53 pm

1 stop10h 05m

$235

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 9/17

7:55 pm-11:37 am

1 stop16h 42m

Boise Air Term. Gowen Fld

Sun 9/21

12:22 pm-9:06 am

1 stop19h 44m

$235

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Wed 9/17

4:35 pm-10:25 pm

1 stop6h 50m

Boise Air Term. Gowen Fld

Sun 9/21

3:20 pm-7:40 pm

Nonstop3h 20m

$245

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Fri 10/17

12:06 pm-8:03 pm

1 stop8h 57m

Boise Air Term. Gowen Fld

Mon 10/20

8:58 pm-11:36 am

1 stop13h 38m

$259

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 9/9

2:25 pm-10:32 pm

2 stops9h 07m

Boise Air Term. Gowen Fld

Sat 9/13

9:00 am-9:21 pm

2 stops11h 21m

$274

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 44 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, October is the cheapest month in which you can book a flight from Illinois to Boise (average of $314). Flying from Illinois to Boise in June is currently the most expensive (average of $398). 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 July 30, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Boise as you normally would.

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 July 30, 2025.

The most flights from USIL to BOI are scheduled on a Monday (7 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (4 on average).

Reviews of airlines servicing Boise

Get insights into the airlines that provide service to Boise. 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 Boise. Reviews last updated July 30, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest, and Delta from Illinois to Boise to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Southwest
8.0
Very good
4,241 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Hawaiian Airlines
7.8
Good
2,611 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,896 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Boarding

8.1

Overall

8.0

Food

7.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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.

  • 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 Spirit Airlines. You may also be able to find cheap deals on American Airlines and Hawaiian Airlines, with prices starting from $99 and $107, 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 (90%), Envoy Air (90%), United Airlines (81%).

  • What are the cheapest flights from Illinois to Boise?

    While on average a flight from Illinois to Boise is generally $349, our data shows the cheapest flight currently is $79. When looking at the most popular route, (Chicago O'Hare Intl - Boise Air Term. Gowen Fld), you can expect to pay $166 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, October is the cheapest month in which you can book a flight from Illinois to Boise (average of $314). Flying from Illinois to Boise in June is currently the most expensive (average of $398). 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
Ontario
McCall
Caldwell

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Alternative routes for Illinois to Boise

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Illinois to Boise

Discover the top 5 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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$174Average$288FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$227Average$337FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$237Average$518FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$254Average$348FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$268Average$522FlexibilityNo cancel feeOn-time69%

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