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Cheap flights from Boise to Illinois from $105

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Boise to Illinois departing on 5/17. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Boise to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
1:22 pm - 8:32 pm
BOI
-
ORD
6h 10m
1 stop
Frontier Logo
9:37 pm - 12:30 pm
ORD
-
BOI
15h 53m
1 stop
$241Frontier
Sun, May 10 - Sat, May 23
Southwest Logo
12:10 pm - 4:30 pm
BOI
-
MDW
3h 20mnonstop
Southwest Logo
10:20 am - 4:10 pm
MDW
-
BOI
6h 50m
1 stop
$260Southwest
Thu, Aug 13 - Tue, Aug 18
Alaska Airlines Logo
4:19 pm - 11:59 pm
BOI
-
ORD
6h 40m
1 stop
Alaska Airlines Logo
6:00 am - 1:02 pm
ORD
-
BOI
8h 02m
1 stop
$310Alaska Airlines
Wed, May 20 - Sun, May 24
American Airlines Logo
3:06 pm - 8:07 pm
BOI
-
ORD
4h 01mnonstop
American Airlines Logo
11:32 am - 2:16 pm
ORD
-
BOI
3h 44mnonstop
$315American Airlines
Wed, Jul 8 - Tue, Jul 14
American Airlines Logo
3:11 pm - 8:04 pm
BOI
-
ORD
3h 53mnonstop
American Airlines Logo
11:30 am - 2:20 pm
ORD
-
BOI
3h 50mnonstop
$316American Airlines
Sat, May 23 - Sat, May 30
United Airlines Logo
5:44 pm - 11:50 pm
BOI
-
STL
5h 06m
1 stop
United Airlines Logo
5:10 am - 9:35 am
STL
-
BOI
5h 25m
1 stop
$353United Airlines
Tue, Sep 1 - Wed, Sep 2
Delta Logo
11:39 pm - 8:10 am
BOI
-
STL
7h 31m
1 stop
Delta Logo
7:59 pm - 12:04 am
STL
-
BOI
5h 05m
1 stop
$361Delta
Mon, May 11 - Tue, May 12
Alaska Airlines Logo
4:19 pm - 11:54 pm
BOI
-
STL
6h 35m
1 stop
Alaska Airlines Logo
7:41 pm - 11:03 am
STL
-
BOI
16h 22m
1 stop
$365Alaska Airlines
Wed, Jun 3 - Sun, Jun 7
Delta Logo
2:18 pm - 10:21 pm
BOI
-
BMI
7h 03m
1 stop
Delta Logo
6:00 am - 12:43 pm
BMI
-
BOI
7h 43m
1 stop
$399Delta
Tue, May 5 - Sat, May 9
United Airlines Logo
12:08 pm - 9:02 pm
BOI
-
MLI
7h 54m
1 stop
United Airlines Logo
3:47 pm - 10:35 pm
MLI
-
BOI
7h 48m
2 stops
$404United Airlines
Tue, May 5 - Sat, May 9

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American Airlines flights from Boise to Illinois

Our best American Airlines deals on Boise to Illinois flight tickets
American Airlines
Jul 8
BOI3:06 pmBoise Air Term. Gowen Fld
4h 01m
ORD8:07 pmChicago O'Hare Intl
Jul 14
ORD11:32 amChicago O'Hare Intl
3h 44m
BOI2:16 pmBoise Air Term. Gowen Fld
$315
American Airlines
May 23
BOI3:11 pmBoise Air Term. Gowen Fld
3h 53m
ORD8:04 pmChicago O'Hare Intl
May 30
ORD11:30 amChicago O'Hare Intl
3h 50m
BOI2:20 pmBoise Air Term. Gowen Fld
$316
American Airlines
Aug 12
BOI12:17 pmBoise Air Term. Gowen Fld
9h 53m
1 stop
ORD11:10 pmChicago O'Hare Intl
Aug 19
ORD9:45 amChicago O'Hare Intl
3h 59m
BOI12:44 pmBoise Air Term. Gowen Fld
$325

Alaska Airlines flights from Boise to Illinois

Our best Alaska Airlines deals on Boise to Illinois flight tickets
Alaska Airlines
May 20
BOI4:19 pmBoise Air Term. Gowen Fld
6h 40m
1 stop
ORD11:59 pmChicago O'Hare Intl
May 24
ORD6:00 amChicago O'Hare Intl
8h 02m
1 stop
BOI1:02 pmBoise Air Term. Gowen Fld
$310
Alaska Airlines
May 12
BOI2:57 pmBoise Air Term. Gowen Fld
8h 02m
1 stop
ORD11:59 pmChicago O'Hare Intl
May 21
ORD6:00 amChicago O'Hare Intl
9h 10m
1 stop
BOI2:10 pmBoise Air Term. Gowen Fld
$347
Alaska Airlines
May 29
BOI4:19 pmBoise Air Term. Gowen Fld
6h 40m
1 stop
ORD11:59 pmChicago O'Hare Intl
May 31
ORD6:00 amChicago O'Hare Intl
9h 10m
1 stop
BOI2:10 pmBoise Air Term. Gowen Fld
$358

momondo 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, momondo users made 832,500 searches. Data last updated April 21, 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

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Sun 5/10

1:22 pm-8:32 pm

1 stop6h 10m

Chicago O'Hare Intl

Sat 5/23

9:37 pm-12:30 pm

1 stop15h 53m

$241

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

Thu 8/13

12:10 pm-4:30 pm

Nonstop3h 20m

Chicago Midway

Tue 8/18

10:20 am-4:10 pm

1 stop6h 50m

$260

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Wed 5/20

4:19 pm-11:59 pm

1 stop6h 40m

Chicago O'Hare Intl

Sun 5/24

6:00 am-1:02 pm

1 stop8h 02m

$310

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Wed 7/8

3:06 pm-8:07 pm

Nonstop4h 01m

Chicago O'Hare Intl

Tue 7/14

11:32 am-2:16 pm

Nonstop3h 44m

$315
Quickest round-trip

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Sat 5/23

3:11 pm-8:04 pm

Nonstop3h 53m

Chicago O'Hare Intl

Sat 5/30

11:30 am-2:20 pm

Nonstop3h 50m

$316

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 9/1

5:44 pm-11:50 pm

1 stop5h 06m

Lambert-St Louis

Wed 9/2

5:10 am-9:35 am

1 stop5h 25m

$353

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 5/11

11:39 pm-8:10 am

1 stop7h 31m

Lambert-St Louis

Tue 5/12

7:59 pm-12:04 am

1 stop5h 05m

$361

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 6/3

4:19 pm-11:54 pm

1 stop6h 35m

Lambert-St Louis

Sun 6/7

7:41 pm-11:03 am

1 stop16h 22m

$365

BoiseBloomington

BOI - BMI

BOIBMI

Boise Air Term. Gowen Fld

Tue 5/5

2:18 pm-10:21 pm

1 stop7h 03m

Bloomington-Normal

Sat 5/9

6:00 am-12:43 pm

1 stop7h 43m

$399

BoiseMoline

BOI - MLI

BOIMLI

Boise Air Term. Gowen Fld

Tue 5/5

12:08 pm-9:02 pm

1 stop7h 54m

Moline Quad-City

Sat 5/9

3:47 pm-10:35 pm

2 stops7h 48m

$404

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

How to get the cheapest flight ticket from Boise to Illinois

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Boise is in September. Flight prices, which tend to average around $325, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of September, then flying in May is also cheap. Prices for this month can be found on momondo for an average of $326.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from Boise to Illinois is on a Thursday when prices can be found for as low as $462. Flights from Boise to Illinois on a Sunday will generally be more expensive and average around $716. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is at noon. Flights from Boise to Illinois during this time can be as low as $427. Flights in the morning are often more expensive with an average ticket price of $615.

What is the cheapest Boise Air Term. Gowen Fld to Illinois flight route?

Fly from Boise Air Term. Gowen Fld to Chicago O'Hare Intl for the best Boise Air Term. Gowen Fld - Illinois flight prices

How far in advance should I book a flight to Illinois?

You are more likely to see cheaper flights to Illinois from Boise when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $394 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Boise for as low as $138 on momondo.

What cabin class options are available on Boise Air Term. Gowen Fld to Illinois flights?

There are 4 cabin classes available to choose from on Boise Air Term. Gowen Fld to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Boise to Illinois flights?

You could potentially save up to 20% on your flight if you consider stops on a Boise to Illinois flight.

Cheap Boise to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Boise to Illinois

Best Price Found

$228

Fastest flight time

3h 20m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from Boise in the past 72 hours is $228. The best round-trip flight deal from Boise to Illinois found on momondo in the last 72 hours is $442.
The fastest flight from Boise to Illinois takes 3h 20m
Direct flights go from Boise to Illinois every day.
There are 98 airports in Illinois. From Boise there are direct flights to Chicago O'Hare Intl (ORD), Chicago Midway (MDW).
Search flight deals

Frequently asked questions about flying from Boise to Illinois

  • When did momondo last update prices for flights from Boise Air Term. Gowen Fld Airport to Illinois?

    Prices for flights from Boise Air Term. Gowen Fld Airport to Illinois were last updated today.

  • How many operators does momondo search for flights from Boise Air Term. Gowen Fld Airport to Illinois?

  • How old do you have to be to fly from Boise Air Term. Gowen Fld Airport to Illinois?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Boise Air Term. Gowen Fld Airport to Illinois.

  • What documentation or ID do you need to fly to Illinois?

    The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Boise to Illinois?

Best airlines flying from Boise to Illinois

Compare and see reviews for airlines that fly from Boise to Illinois with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $123Free CancellationRating
7.9
8,434 reviews
Search Delta flights
SouthwestPriceFrom $233Free CancellationRating
8.0
4,331 reviews
Search Southwest flights
United AirlinesPriceFrom $239Free CancellationRating
7.4
9,613 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $260Free CancellationRating
7.9
12,269 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $268Free CancellationRating
7.1
11,645 reviews
Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Boise to Illinois?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Boise to Illinois. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Boise to Illinois with flexible booking policies on momondo?

Flights from Boise to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Boise to Illinois?

Once all potential Boise to Illinois flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Boise to Illinois right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Boise to Illinois flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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