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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 3/24. 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
12:03 pm - 9:48 am
BOI
-
STL
20h 45m
1 stop
Frontier Logo
8:17 pm - 11:08 am
STL
-
BOI
15h 51m
1 stop
$201Frontier
Thu, Apr 9 - Sat, Apr 18
Alaska Airlines Logo
8:28 pm - 6:39 am
BOI
-
ORD
9h 11m
1 stop
Alaska Airlines Logo
6:00 am - 1:52 pm
ORD
-
BOI
8h 52m
1 stop
$214Alaska Airlines
Thu, Apr 16 - Thu, Apr 23
Delta Logo
2:18 pm - 10:28 pm
BOI
-
MDW
7h 10m
1 stop
Delta Logo
9:29 am - 2:26 pm
MDW
-
BOI
5h 57m
1 stop
$229Delta
Fri, Apr 17 - Mon, Apr 20
Delta Logo
2:18 pm - 10:28 pm
BOI
-
MDW
7h 10m
1 stop
Delta Logo
9:29 am - 8:00 pm
MDW
-
BOI
11h 31m
2 stops
$234Delta
Sat, May 2 - Mon, May 4
Southwest Logo
9:10 pm - 5:45 am
BOI
-
MDW
7h 35m
1 stop
Southwest Logo
3:15 pm - 10:05 pm
MDW
-
BOI
7h 50m
1 stop
$258Southwest
Sun, May 3 - Sat, May 9
United Airlines Logo
12:38 pm - 5:12 pm
BOI
-
ORD
3h 34mnonstop
United Airlines Logo
5:00 am - 9:45 am
ORD
-
BOI
5h 45m
1 stop
$259United Airlines
Thu, Jun 4 - Sun, Jun 7
Southwest Logo
6:40 am - 3:55 pm
BOI
-
MDW
8h 15m
1 stop
Southwest Logo
6:05 pm - 12:25 am
MDW
-
BOI
7h 20m
1 stop
$269Southwest
Wed, Apr 15 - Tue, Apr 21
American Airlines Logo
1:39 pm - 10:58 pm
BOI
-
STL
8h 19m
1 stop
American Airlines Logo
5:51 am - 12:49 pm
STL
-
BOI
7h 58m
1 stop
$277American Airlines
Wed, Apr 1 - Wed, Apr 8
United Airlines Logo
9:26 am - 8:54 pm
BOI
-
STL
10h 28m
2 stops
United Airlines Logo
6:30 am - 11:49 am
STL
-
BOI
6h 19m
1 stop
$282United Airlines
Sat, Apr 18 - Sat, Apr 25
American Airlines Logo
3:11 pm - 11:55 pm
BOI
-
MLI
7h 44m
1 stop
American Airlines Logo
6:00 am - 2:08 pm
MLI
-
BOI
9h 08m
1 stop
$405American Airlines
Sat, May 23 - Wed, Jul 15

Delta flights from Boise to Illinois

Our best Delta deals on Boise to Illinois flight tickets
Delta
Apr 17
BOI2:18 pmBoise Air Term. Gowen Fld
7h 10m
1 stop
MDW10:28 pmChicago Midway
Apr 20
MDW9:29 amChicago Midway
5h 57m
1 stop
BOI2:26 pmBoise Air Term. Gowen Fld
$229
Delta
Apr 15
BOI5:40 amBoise Air Term. Gowen Fld
6h 43m
1 stop
ORD1:23 pmChicago O'Hare Intl
Apr 21
ORD2:09 pmChicago O'Hare Intl
9h 15m
2 stops
BOI10:24 pmBoise Air Term. Gowen Fld
$234
Delta
Apr 16
BOI8:30 amBoise Air Term. Gowen Fld
10h 46m
2 stops
ORD8:16 pmChicago O'Hare Intl
Apr 20
ORD2:09 pmChicago O'Hare Intl
9h 15m
2 stops
BOI10:24 pmBoise Air Term. Gowen Fld
$239

American Airlines flights from Boise to Illinois

Our best American Airlines deals on Boise to Illinois flight tickets
American Airlines
Apr 1
BOI1:39 pmBoise Air Term. Gowen Fld
8h 19m
1 stop
STL10:58 pmLambert-St Louis
Apr 8
STL5:51 amLambert-St Louis
7h 58m
1 stop
BOI12:49 pmBoise Air Term. Gowen Fld
$277
American Airlines
Mar 31
BOI1:31 pmBoise Air Term. Gowen Fld
3h 40m
ORD6:11 pmChicago O'Hare Intl
Apr 7
ORD9:54 amChicago O'Hare Intl
3h 55m
BOI12:49 pmBoise Air Term. Gowen Fld
$306
American Airlines
Apr 30
BOI1:29 pmBoise Air Term. Gowen Fld
3h 47m
ORD6:16 pmChicago O'Hare Intl
May 3
ORD9:54 amChicago O'Hare Intl
3h 55m
BOI12:49 pmBoise Air Term. Gowen Fld
$309

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 March 4, 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

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 4/9

12:03 pm-9:48 am

1 stop20h 45m

Lambert-St Louis

Sat 4/18

8:17 pm-11:08 am

1 stop15h 51m

$201

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Thu 4/16

8:28 pm-6:39 am

1 stop9h 11m

Chicago O'Hare Intl

Thu 4/23

6:00 am-1:52 pm

1 stop8h 52m

$214

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

Fri 4/17

2:18 pm-10:28 pm

1 stop7h 10m

Chicago Midway

Mon 4/20

9:29 am-2:26 pm

1 stop5h 57m

$229

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

Sat 5/2

2:18 pm-10:28 pm

1 stop7h 10m

Chicago Midway

Mon 5/4

9:29 am-8:00 pm

2 stops11h 31m

$234

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

Sun 5/3

9:10 pm-5:45 am

1 stop7h 35m

Chicago Midway

Sat 5/9

3:15 pm-10:05 pm

1 stop7h 50m

$258

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Thu 6/4

12:38 pm-5:12 pm

Nonstop3h 34m

Chicago O'Hare Intl

Sun 6/7

5:00 am-9:45 am

1 stop5h 45m

$259

BoiseChicago

BOI - MDW

BOIMDW

Boise Air Term. Gowen Fld

Wed 4/15

6:40 am-3:55 pm

1 stop8h 15m

Chicago Midway

Tue 4/21

6:05 pm-12:25 am

1 stop7h 20m

$269

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 4/1

1:39 pm-10:58 pm

1 stop8h 19m

Lambert-St Louis

Wed 4/8

5:51 am-12:49 pm

1 stop7h 58m

$277

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 4/18

9:26 am-8:54 pm

2 stops10h 28m

Lambert-St Louis

Sat 4/25

6:30 am-11:49 am

1 stop6h 19m

$282

BoiseMoline

BOI - MLI

BOIMLI

Boise Air Term. Gowen Fld

Sat 5/23

3:11 pm-11:55 pm

1 stop7h 44m

Moline Quad-City

Wed 7/15

6:00 am-2:08 pm

1 stop9h 08m

$405

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 $319, 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 $343.

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 $476. Flights from Boise to Illinois on a Sunday will generally be more expensive and average around $731. 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 in the afternoon. Flights from Boise to Illinois during this time can be as low as $417. Flights in the morning are often more expensive with an average ticket price of $642.

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 $383 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 $237 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

$199

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 $199. The best round-trip flight deal from Boise to Illinois found on momondo in the last 72 hours is $412.
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

  • 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 $87Free CancellationRating
7.9
8,245 reviews
Search Delta flights
United AirlinesPriceFrom $219Free CancellationRating
7.4
9,382 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $224Free CancellationRating
8.0
11,982 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $233Free CancellationRating
8.0
4,304 reviews
Search Southwest flights
American AirlinesPriceFrom $255Free CancellationRating
7.1
11,378 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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