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$80+ Cheap flights from Boise (BOI) to Illinois

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 5/26. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ORD
abr. 24 — may. 11
vie. 4/24
vie. 5/1
1 adult, Economy
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Cheap flight deals from Boise to Illinois

Cheapest flights from Boise to Illinois
Explore the most affordable flight options available from Boise to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on marzo 25, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/24. 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.
mar. 5/51:22 pm
BOI
-
ORD
2 stops32h 39m
Frontier
mié. 5/139:42 pm
ORD
-
BOI
1 stop15h 45m
Frontier
Deal found 3/24$211
This Southwest deal was found by Cheapflights users on 3/24. 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.
mar. 4/214:05 pm
BOI
-
MDW
1 stop6h 15m
Southwest
mar. 4/285:35 pm
MDW
-
BOI
1 stop6h 55m
Southwest
Deal found 3/24$246
This Southwest deal was found by Cheapflights users on 3/24. 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.
mar. 4/214:05 pm
BOI
-
ORD
1 stop6h 50m
Southwest
mar. 4/2810:30 am
ORD
-
BOI
1 stop5h 55m
Southwest
Deal found 3/24$246
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 7/231:04 pm
BOI
-
ORD
1 stop6h 49m
Frontier
lun. 7/279:48 pm
ORD
-
BOI
1 stop15h 21m
Frontier
Deal found 3/22$261
This Southwest deal was found by Cheapflights users on 3/24. 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.
mar. 5/54:05 pm
BOI
-
STL
1 stop6h 10m
Southwest
mié. 5/66:30 pm
STL
-
BOI
1 stop6h 55m
Southwest
Deal found 3/24$263
This Delta deal was found by Cheapflights users on 3/24. 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.
mié. 4/222:18 pm
BOI
-
MDW
1 stop7h 10m
Delta
mié. 4/299:29 am
MDW
-
BOI
1 stop5h 57m
Delta
Deal found 3/24$271
This Delta deal was found by Cheapflights users on 3/24. 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.
mié. 4/225:40 am
BOI
-
ORD
1 stop6h 43m
Delta
mié. 4/297:35 am
ORD
-
BOI
1 stop5h 27m
Delta
Deal found 3/24$271
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 4/512:03 pm
BOI
-
ORD
1 stop24h 16m
Frontier
mié. 4/83:29 pm
ORD
-
BOI
1 stop20h 39m
Frontier
Deal found 3/22$272
This Southwest deal was found by Cheapflights users on 3/23. 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.
sáb. 4/2511:00 am
BOI
-
ORD
2 stops10h 20m
Southwest
sáb. 5/27:00 am
ORD
-
BOI
2 stops10h 15m
Southwest
Deal found 3/23$274
This Delta deal was found by Cheapflights users on 3/24. 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.
mié. 5/139:16 pm
BOI
-
MDW
2 stops10h 26m
Delta
mar. 5/199:23 am
MDW
-
BOI
2 stops9h 27m
Delta
Deal found 3/24$282
This American Airlines deal was found by Cheapflights users on 3/24. 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.
mié. 4/221:29 pm
BOI
-
ORD
Nonstop3h 47m
American Airlines
mié. 4/299:54 am
ORD
-
BOI
Nonstop3h 55m
American Airlines
Deal found 3/24$283
This Southwest deal was found by Cheapflights users on 3/23. 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.
mar. 4/286:40 am
BOI
-
ORD
1 stop11h 10m
Southwest
vie. 5/14:50 pm
ORD
-
BOI
1 stop8h 55m
Southwest
Deal found 3/23$287

Find flight deals from Boise to Illinois

Keep the following information in mind while searching for Boise to Illinois flight deals. Data was last updated marzo 25, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$211
(Kiwi.com)

One-way from

$80
(Frontier)

Popular in

March

Cheapest in

September

Average price

$473

Good round-trip deal

$388 or less

Good one-way deal

$196 or less
Provider with most accurate pricing for Boise Air Term. Gowen Fld-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Chicago (CHI) flights.
Search Deals
From Boise Air Term. Gowen Fld to Illinois
Search Deals
One-way flight from Boise Air Term. Gowen Fld to Illinois
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($18 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 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 Boise Air Term. Gowen Fld to Illinois.
Search Deals
Price to beat on a one-way flight from Boise Air Term. Gowen Fld to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Boise to Illinois 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 marzo 25, 2026.
Use the filters below to find and compare flights from Boise to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

mar. 5/5

2:57 pm-11:59 pm

1 stop8h 02m

Lambert-St Louis

mié. 5/6

4:46 pm-11:59 pm

1 stop8h 13m

$290

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

sáb. 4/25

4:38 pm-6:40 am

1 stop13h 02m

Chicago O'Hare Intl

sáb. 5/2

6:00 am-1:52 pm

1 stop8h 52m

$295

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

mié. 5/27

5:46 pm-12:44 am

1 stop5h 58m

Chicago O'Hare Intl

sáb. 5/30

7:05 am-1:34 pm

1 stop7h 29m

$303

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

jue. 5/7

1:22 pm-7:23 pm

1 stop29h 01m

Lambert-St Louis

lun. 5/11

8:08 pm-12:27 pm

1 stop17h 19m

$305

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

mar. 4/14

2:22 pm-11:59 pm

1 stop8h 37m

Lambert-St Louis

mié. 4/15

7:00 am-3:29 pm

1 stop9h 29m

$317

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

mié. 5/13

9:16 pm-8:42 am

2 stops10h 26m

Chicago Midway

mar. 5/19

7:13 pm-11:46 pm

1 stop5h 33m

$328

BoiseMoline

BOI - MLI

BOIMLI

Boise Air Term. Gowen Fld

sáb. 4/18

2:37 pm-9:32 pm

1 stop5h 55m

Moline Quad-City

sáb. 4/25

6:30 am-11:49 am

1 stop6h 19m

$330

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

mié. 5/27

9:16 pm-8:36 am

2 stops10h 20m

Chicago O'Hare Intl

sáb. 5/30

8:10 am-5:50 pm

2 stops10h 40m

$334

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

mar. 5/5

6:40 am-2:00 pm

1 stop6h 20m

Chicago Midway

mar. 5/12

5:35 pm-11:30 pm

1 stop6h 55m

$335

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

sáb. 4/25

2:50 pm-9:20 pm

1 stop5h 30m

Chicago Midway

sáb. 5/2

10:10 am-4:15 pm

2 stops7h 05m

$340

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Boise to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Boise 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 Boise to Illinois

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

Currently, May is the cheapest month in which you can book a flight from Boise to Illinois (average of $87). Flying from Boise to Illinois in December is currently the most expensive (average of $276). 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 BOI to IL?

Find hourly flight availability from Boise to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated marzo 25, 2026.

When flying from Boise to Illinois, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 39% versus a flight in the evening.

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated marzo 25, 2026.
Read through reviews of airlines operating flights from Boise to Illinois, such as Southwest,Alaska Airlines, andDelta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,332 reviews

Food

7.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,332 reviews
Southwest
8.0
Very good
4,332 reviews

Food

7.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Alaska Airlines
7.9
Good
12,108 reviews
Southwest
8.0
Very good
4,332 reviews

Food

7.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Delta
7.9
Good
8,327 reviews
Southwest
8.0
Very good
4,332 reviews

Food

7.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
United Airlines
7.4
Good
9,478 reviews
Southwest
8.0
Very good
4,332 reviews

Food

7.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,493 reviews
Southwest
8.0
Very good
4,332 reviews

Food

7.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

Related info for your journey

Find useful and relevant information for your journey from Boise to Illinois. 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 from for flights from Boise to Illinois?

    If you book a flight to Illinois from Boise, you will be flying from Air Term. Gowen Fld, which is the city’s only airport. Boise Air Term. Gowen Fld (BOI) is located 3.3 mi from the center of Boise.

  • How long is the flight from Boise to Illinois?

    Alaska Airlines, United Airlines, and Frontier can get you from Boise to Illinois in just under 5h 58m. Your travel time can differ by up to 23h 03m. The distance between Boise and Illinois is about 1432 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Boise to Illinois one-way?

    One-way options have recently been found by users for as low as $87 on Alaska Airlines. Other airlines that offer cheap prices include Southwest from $87 and Delta from $87 one-way.

  • What are the most popular routes from Boise to Illinois?

    Most travelers choose Boise Air Term. Gowen Fld - Chicago O'Hare Intl, Boise Air Term. Gowen Fld - Chicago Midway or Boise Air Term. Gowen Fld - Lambert-St Louis when deciding on the best route from Boise to Illinois.

  • What are the most reliable airlines from Boise to Illinois?

    Consider Emirates (90%), Lufthansa (87%) or SkyWest Airlines (86%) when booking your flight. These represent the most reliable airlines when flying from Boise to Illinois.

  • What are the cheapest flights from Boise to Illinois?

    Looking for the cheapest flight from Boise to Illinois? While on average our users pay $539, our data indicates the cheapest price to be $126. The most popular route (Boise Air Term. Gowen Fld - Chicago O'Hare Intl), is priced around $225.

  • Can I find deals for flights from Boise to Illinois that include hotel bookings?

    Yes. In addition to deals on Boise to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Boise to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boise to Illinois.

  • Can I find deals for business class flights from Boise to Illinois?

    Yes. Cheapflights offers flight deals from Boise to Illinois 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 Boise to Illinois?

    Currently, May is the cheapest month in which you can book a flight from Boise to Illinois (average of $87). Flying from Boise to Illinois in December is currently the most expensive (average of $276). 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.

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Alternative routes for Boise to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Boise to Spokane flights

Top 5 airlines flying from Boise to Illinois

Discover the top 5 airlines that operate flights from Boise to Illinois. 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 marzo 25, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$87Average$305FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$215Average$561FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$233Average$387FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$255Average$424FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$260Average$374FlexibilityNo cancel feeOn-time75%

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