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$78+ 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 6/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
May 5 — May 121
Mon 5/5
Mon 5/12
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 April 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$201
(United Airlines)

One-way from

$78
(United Airlines)

Popular in

November

Cheapest in

September

Average price

$377

Good round-trip deal

$322 or less

Good one-way deal

$153 or less
Provider with most accurate pricing for Chicago (CHI)-Boise Air Term. Gowen Fld flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Boise Air Term. Gowen Fld flights.
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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. 10% potential increase in price ($49 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 30, 2025.

This United Airlines deal was found by Cheapflights users on 4/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/298:45 amORD - BOI
Nonstop3h 58mUnited Airlines
Mon 6/22:31 pmBOI - ORD
1 stop9h 28mUnited Airlines
Deal found 4/29$201
This Alaska Airlines deal was found by Cheapflights users on 4/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/176:20 amORD - BOI
1 stop9h 40mAlaska Airlines
Sun 9/215:45 pmBOI - ORD
1 stop12h 18mAlaska Airlines
Deal found 4/29$210
This Delta deal was found by Cheapflights users on 4/29. 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.
Wed 5/146:20 pmORD - BOI
1 stop6h 52mDelta
Tue 5/2012:50 pmBOI - ORD
1 stop7h 50mDelta
Deal found 4/29$211
This Southwest deal was found by Cheapflights users on 4/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/35:25 pmORD - BOI
1 stop8h 15mSouthwest
Mon 10/61:05 pmBOI - ORD
1 stop8h 15mSouthwest
Deal found 4/29$215
This Delta deal was found by Cheapflights users on 4/29. 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.
Wed 7/239:19 amMDW - BOI
1 stop5h 53mDelta
Sun 8/35:20 amBOI - MDW
1 stop6h 46mDelta
Deal found 4/29$217
This CheapOair deal was found by Cheapflights users on 4/28. 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.
Wed 5/218:15 pmSTL - BOI
1 stop16h 36mFrontier
Sun 5/2512:36 pmBOI - STL
1 stop19h 33mFrontier
Deal found 4/28$227
This Southwest deal was found by Cheapflights users on 4/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/35:35 amMDW - BOI
1 stop7h 35mSouthwest
Sat 6/74:45 pmBOI - MDW
1 stop5h 35mSouthwest
Deal found 4/27$240
This Mytrip deal was found by Cheapflights users on 4/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/298:37 amORD - BOI
2 stops27h 44mSpirit Airlines
Mon 6/212:16 pmBOI - ORD
1 stop21h 39mSpirit Airlines
Deal found 4/29$248
This Frontier deal was found by Cheapflights users on 4/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/226:00 amORD - BOI
1 stop6h 51mFrontier
Tue 5/2712:36 pmBOI - ORD
1 stop10h 16mFrontier
Deal found 4/29$280
This Hawaiian Airlines deal was found by Cheapflights users on 4/28. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/133:35 pmSTL - BOI
1 stop8h 05mHawaiian Airlines
Sat 9/206:35 amBOI - STL
1 stop7h 04mHawaiian Airlines
Deal found 4/28$286
This Delta deal was found by Cheapflights users on 4/28. 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 5/286:05 pmSTL - BOI
1 stop7h 17mDelta
Thu 5/2911:59 pmBOI - STL
1 stop8h 01mDelta
Deal found 4/28$287
This United Airlines deal was found by Cheapflights users on 4/28. 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.
Tue 5/131:41 pmSTL - BOI
1 stop5h 19mUnited Airlines
Sat 5/1711:02 amBOI - STL
2 stops8h 59mUnited Airlines
Deal found 4/28$292

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 April 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

Thu 5/29

8:45 am-11:43 am

Nonstop3h 58m

Boise Air Term. Gowen Fld

Mon 6/2

2:31 pm-12:59 am

1 stop9h 28m

$201

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Wed 5/14

6:20 pm-12:12 am

1 stop6h 52m

Boise Air Term. Gowen Fld

Tue 5/20

12:50 pm-9:40 pm

1 stop7h 50m

$211

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Wed 7/23

7:21 pm-11:59 pm

1 stop5h 38m

Boise Air Term. Gowen Fld

Sun 8/3

5:20 am-1:06 pm

1 stop6h 46m

$217

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 5/21

8:15 pm-11:51 am

1 stop16h 36m

Boise Air Term. Gowen Fld

Sun 5/25

12:36 pm-9:09 am

1 stop19h 33m

$227

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Tue 6/3

5:35 am-12:10 pm

1 stop7h 35m

Boise Air Term. Gowen Fld

Sat 6/7

4:45 pm-11:20 pm

1 stop5h 35m

$240

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Thu 5/29

8:37 am-11:21 am

2 stops27h 44m

Boise Air Term. Gowen Fld

Mon 6/2

12:16 pm-10:55 am

1 stop21h 39m

$248

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Thu 5/22

6:00 am-11:51 am

1 stop6h 51m

Boise Air Term. Gowen Fld

Tue 5/27

12:36 pm-11:52 pm

1 stop10h 16m

$280

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Sat 9/13

3:35 pm-10:40 pm

1 stop8h 05m

Boise Air Term. Gowen Fld

Sat 9/20

6:35 am-2:39 pm

1 stop7h 04m

$286

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 5/28

6:05 pm-12:22 am

1 stop7h 17m

Boise Air Term. Gowen Fld

Thu 5/29

11:59 pm-9:00 am

1 stop8h 01m

$287

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 5/13

1:41 pm-6:00 pm

1 stop5h 19m

Boise Air Term. Gowen Fld

Sat 5/17

11:02 am-9:01 pm

2 stops8h 59m

$292

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 42 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 $406). 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 April 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.

Rainfall in Boise by month

Plan your trip to Boise by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Boise ranges from 0.2 - 1.6 inches per month. December is typically the wettest month, when rainfall can reach 1.6 in. August is typically the driest time to visit Boise when rainfall is around 0.2 in.

Temperature in Boise by month

Plan your trip to Boise by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Boise, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 75.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 30.2 F).

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 April 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. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Boarding

8.2

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
9,968 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Boarding

8.2

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,295 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Boarding

8.2

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,936 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Boarding

8.2

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,406 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Boarding

8.2

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Boarding

8.2

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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?

    $78 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Alaska Airlines and Delta, with prices starting from $87 and $88, 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 (82%), United Airlines (82%), Air Canada (82%).

  • What are the cheapest flights from Illinois to Boise?

    While on average a flight from Illinois to Boise is generally $303, our data shows the cheapest flight currently is $134. When looking at the most popular route, (Chicago O'Hare Intl - Boise Air Term. Gowen Fld), you can expect to pay $175 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 $406). 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 Illinois?

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

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Alternative routes for Illinois to Boise

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Top 6 airlines flying from Illinois to Boise

Discover the top 6 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 April 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$129Average$231FlexibilityNo cancel feeOn-time65%
DeltaCheapest$174Average$340FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$204Average$338FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$237Average$499FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$258Average$348FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$287Average$499FlexibilityNo cancel feeOn-time69%

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