$122 Find Cheap Flights from Boise to Illinois - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boise to Illinois departing on 7/7. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Illinois

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boise to Illinois, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boise to Illinois, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Boise to Illinois

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Chicago
Chicago1 stop$335
Moline
Moline1 stop$329
Peoria
Peoria1 stop$419
Bloomington
Bloomington2 stops$518
Springfield
Springfield1 stop$530
St. Louis
St. Louis1 stop$306
Paducah
Paducah2 stops$561
Chicago
Chicago1 stop$335
Moline
Moline1 stop$329
Peoria
Peoria1 stop$419
Bloomington
Bloomington2 stops$518
Springfield
Springfield1 stop$530
St. Louis
St. Louis1 stop$306
Paducah
Paducah2 stops$561

Book Cheap Boise to Illinois Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Boise to Illinois that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Boise to Illinois

Thu, Jul 2 - Wed, Jul 8
Frontier Logo
1:25 pm - 6:53 pm
BOI
-
STL
28h 28m
1 stop
Frontier Logo
8:08 pm - 12:29 pm
STL
-
BOI
17h 21m
1 stop
$306Frontier
Fri, Sep 11 - Mon, Sep 14
Frontier Logo
3:52 pm - 11:51 am
BOI
-
STL
18h 59m
1 stop
Frontier Logo
8:10 pm - 12:04 pm
STL
-
BOI
16h 54m
1 stop
$314Frontier
Thu, Aug 13 - Sat, Aug 22
American Airlines Logo
3:16 pm - 12:08 am
BOI
-
MLI
7h 52m
1 stop
American Airlines Logo
6:00 am - 2:02 pm
MLI
-
BOI
9h 02m
1 stop
$329American Airlines
Thu, Aug 13 - Sat, Aug 22
American Airlines Logo
3:16 pm - 12:08 am
BOI
-
MLI
7h 52m
1 stop
American Airlines Logo
11:32 am - 10:40 pm
MLI
-
BOI
12h 08m
2 stops
$334American Airlines
Wed, Jul 15 - Tue, Jul 21
Southwest Logo
4:20 pm - 12:10 am
BOI
-
MDW
6h 50m
1 stop
Southwest Logo
6:10 am - 1:25 pm
MDW
-
BOI
8h 15m
1 stop
$345Southwest
Wed, Aug 12 - Wed, Aug 19
Delta Logo
8:59 am - 9:30 pm
BOI
-
ORD
11h 31m
2 stops
Delta Logo
7:44 pm - 11:59 pm
ORD
-
BOI
5h 15m
1 stop
$350Delta
Wed, Jul 15 - Tue, Jul 21
Southwest Logo
5:30 am - 2:35 pm
BOI
-
MDW
8h 05m
2 stops
Southwest Logo
6:10 am - 1:25 pm
MDW
-
BOI
8h 15m
1 stop
$350Southwest
Tue, Sep 1 - Tue, Sep 8
Delta Logo
11:12 am - 10:36 pm
BOI
-
MDW
10h 24m
2 stops
Delta Logo
7:13 pm - 11:59 pm
MDW
-
BOI
5h 46m
1 stop
$360Delta
Tue, Oct 27 - Sat, Oct 31
United Airlines Logo
6:55 pm - 10:14 am
BOI
-
MLI
14h 19m
2 stops
United Airlines Logo
1:00 pm - 9:16 pm
MLI
-
BOI
9h 16m
2 stops
$429United Airlines
Sat, Aug 15 - Sat, Aug 22
United Airlines Logo
2:44 pm - 8:50 pm
BOI
-
PIA
5h 06m
1 stop
United Airlines Logo
3:35 pm - 10:53 pm
PIA
-
BOI
8h 18m
1 stop
$464United Airlines
Booking Insights

KAYAK's insights & trends for Boise to Illinois flights

Get data-powered insights and trends into flights from Boise to Illinois to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Boise to Illinois?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Boise to Illinois departing in August.

What is the cheapest Boise to Illinois flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Illinois from Boise found in the last 5 days was to Chicago, at $328 round-trip. The most popular route is from Boise (BOI) to Chicago O'Hare Intl Airport (ORD), and the cheapest round-trip airline ticket found on this route in the last 5 days was $328.

What is the cheapest time of day to fly to Illinois?

The average price for all round-trip flights from Boise to Illinois depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to Illinois is generally in the evening, when round-trip flights cost $435 on average. Morning departures are around 43% more expensive than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the morning, which is peak travel time and where the average cost of a ticket is $624.

Can I save money by flying with a layover from Boise to Illinois?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 2 stops layover the cheapest option at $280 on average.

What is the cheapest month to fly from Boise to Illinois?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Boise to Illinois, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Boise to Illinois is October, when tickets cost $112 (return) on average. On the other hand, the most expensive months are March and April, when the average cost of round-trip tickets is $268 and $268 respectively.

What’s the cheapest day of the week to fly from Boise to Illinois?

The average price of all round-trip flights from Boise to Illinois clicked on KAYAK for each day over the last 12 months.

For Boise to Illinois, Thursday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Illinois back to Boise, the best deals are generally found on Wednesday, with Sunday being the most expensive.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Boise to Illinois, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Boise to Illinois, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 12 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$122
Best time to beat the crowds with an average 9% drop in price.
Most popular time to fly with an average 6% increase in price.
Flight from Boise to St. Louis

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Boise to Illinois?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Boise to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Boise to Illinois?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Boise to Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Boise to Illinois?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Boise to Illinois with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Boise to Illinois?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Boise to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top tips for finding cheap flights to Illinois

  • Looking for a cheap flight? 25% of our users found tickets from Boise to the following destinations at these prices or less: Chicago $298 one-way - $387 round-trip; Chicago $251 one-way - $428 round-trip

Reviews of the top 5 airlines serving from Boise to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Boise to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Boise to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
Alaska AirlinesOverall score based on 12535 reviews
8.5Crew
7.8Comfort
7.0Food
7.0Entertainment
8.1Boarding
Airline reviews

My flight was several times rescheduled and then finally canceled.

2.0 MediocrePeter, Jun 2026
SAN - ORD
Read more Alaska Airlines reviews

My flight was several times rescheduled and then finally canceled.

Eva Airlines attendants were wonderful. I really enjoyed the hot meals. They always greeted me with a warm smile. I'm looking forward to flying back to the USA with them again!

The flight kept getting delayed due to a maintenance issue. That happens, but there is no excuse for changing the gate FIVE TIMES, including one time nearly all the way across SeaTac. After we were delayed for 3+ hours, they did send us (via email) a $12 meal voucher...except you can't find a $12 meal anywhere in that airport, unless you consider a bag of M&M's and a bottle of water a meal. The plane had one problem after another but finally took off 4.5 hours late. This caused us to miss our hotel shuttle at ORD (they didn't run past midnight and it was 3 am) so we had to wait 25 minutes and pay for an Uber. I did get a $50 flight voucher from Alaska...big deal. Barely covers my Uber ride that I shouldn't have needed.

It was good. Too long for older people. Service and support was great! Friendly crew!

Flight was cancelled which destroyed the rest of our journey.

WOuld have liked coffee or pretzels but other than that, crew and pilot and flight were great. Seat was great, too.

The overhead storage was already packed full when I boarded (I fly peasant class), but the attendant played some Tetris and made a spot for my small suitcase. Thanks!

Snacks for our toddler could have been better, front the standpoint of variety but that’s not any different from other airlines.

I'm not sure if you are going to ask me about the check in process. I could not get my boarding pass, so I had to stop at the American desk before security. I also had a difficult time downloading the app with the confirmation code for the two flights.

I fell asleep and missed my flight and they rescheduled me no problem. Staff was professional and the plane was clean. I was very happy with my experience.

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

Flight was delayed over 3 hours. Planes were dirty. Staff indifferent. And they serve vegan pretzels as snacks.

It was great. The gate staff were very helpful in Portland when my son forgot his rolling bag and had to go back to get it just in time to make it on the plane. We really appreciate that. Great job!

Airline is not very senior friendly. Flights are late, forcing us to run to the connecting flight. Food is awful. Wish they would go back to pretzels and peanuts. During flight, pressurization isn’t quite right and all of our ears get plugged. Everything is nickel and dime, charging for boarding, seat selection and legroom. While a screen at the desk in the gate area says check your roll on bag now for free due to space limitation, the employee at the desk will not check the bag without a $100 fee. Insane.

Kayak could’ve posted the correct gate number. Almost missed my flight.

Slow boarding, limited food and drink portions. Bad delays and turbulence

there were two flight attendants that were up front...that were the best! They get KUDOs for making my trip only fantastic. Tell them Jeff said that!

OKay. I sat in the back of the plane and it was really loud between babies and little kids, and adults who.like to talk a lot and loudly most of the flight.

Flight coming out of Buffalo was delayed, so we had to be rescheduled on another flight from Baltimore to Phoenix which means we had a long layover and got home 3.5 hours late. Shuttle to parking stopped at 10pm, so we had to pay for an Uber to the parking lot and got charged an extra day of parking since it was after midnight. Not the best experience. Long day!

Was fine, delayed and feels like southwest is always late

We sat on the runway for over an hour before departure. That was unwelcome.

Horrible. Faucet in sink not working, wifi not working. Didn’t bring food or snacks

Flight was delayed before take off and at landing. Baggage took 20 minutes. Flight crew would not serve full soft drink and had to ask multiple times before receiving water.

From checking to boarding, it was a seamless experience. The service agents were so helpful. The flight crew was so pleasant.

Gate agent showed up 20 minutes before boarding and was not at all friendly. Had to take this flight due to the one on the day before being cancelled and any later options were already full with long standby lists. Despite having paid for Delta Comfort seats, Delta did not allow me (or anyone) to choose their seat. The agent assigned them for everyone just prior to boarding. Self seat selection was allowed on the original flight. Flight staff was great - very friendly.

Flight attendants were great. Cheerful, upbeat and friendly. Jet, in particular, was fantastic.

I have Precheck. Flew HPN to DEN and return this past weekend. Delta didn't attach my Precheck number to this trip. So it was waiting in general line especially in Denver. Unavailable.

Original flight was delayed, then cancelled and the gate staff did not expedite rebooking. Also, no instructions were given that a ticket number was needed before being called to facilitate rebooking. This could have been much more organized.

Be on time? When not on time a circling for over an hour offer more than 1 bag of chips to the passengers? It was a 7 hour flight by the time we got done.

Five hour delays every hour, I wish it were all at once

Very easy ! Use the kiosk and bag drop and right to security within 10 min

Over 5 hour delay with minimal updates or ability to standby for alternative flights. During boarding and 1 hr+ wait for takeoff, seats were drenched w water from air conditioning condensation and always leftover crumbs on carpet and seats

Boarded early, left early, arrived 40 mins early! A win win for me!

These airplanes should be illegal. The seats are two tight, it is a safety issue. Wheelchair support was ridiculously slow. We almost missed our flight.

This flight is a quick way to get to Chicago, but a bit expensive.

O’hsre taxi and deboarding took 40 minutes. Needed 20 minutes extra time between connecting flights to avoid running through terminal.

Standard flight with a drinks and a snack- overall very quick flight. The flight attendants were very strict, bordered on rude.

Delayed - weather wasn't bad at either end. Also sat on tarmac in ORD.

boarded early to only find out that flight would sit at gate for 45 min to an hour. Landed in chicago and sat on runway for over an hour before got to gate. Total delay was extensive for a 45 min flight door to door.

The flight was significantly delayed. The inbound flight from EWR was delayed departing because of mechanical problems. My original departure from CLT was 5:28 pm but due to the delay of the inbound flight, after arrival, deplaning, cleaning, boarding, we did not push back from the gate until 9:00 pm. Once in the air, the flight was smooth and what was originally supposed to be an arrival in ORD at 7:30 pm local time turned out to be 9:35 pm.

The seats were extremely cramped, with very little legroom or personal space. There was no room left in the overhead bins for a backpack, and the space under the seat in front was so limited that I could barely fit my bag underneath. Overall, the seating arrangement felt very uncomfortable and overcrowded.

weather delay of almost 2 hours then we landed and our gate wasn't available so we waited another 30 min

Delayed flight more than I hour. When boarding we spent some additional time on the plane before takeoff ....

The flight was delayed significantly and we sat on runway after landing for awhile. Best thing was the flight attendant, Jenny, in first class, who was very professional and attentive. She was excellent - the rest of the flight was not.

The flight attendants were extremely sourly and borderline rude. I did not feel appreciated as an AA customer once.

The flight from LA to Chicago was smooth and service was very good overall.

The Mario was so helpful and provided amazing customer service however l have being waiting for a callback for almost a week now and have not heard anything further after l informed them l wanted to change my date of traveling because of my hospital appointment even send them proof and l was unable to use manag your booking on their website is a bit frustrating and l would appreciate an update on My request as soon as possible. And have called them times without numbers no response

Awful, tons of delays, I got into Chicago multiple hours late meaning I hit the very traffic I tried so desperately to avoid. Just empty apologies from American Airlines text alerts. Trash behavior from a trash airline.

They lost my baggage and I am still struggling to the information and update

Requested early boarding to disinfect seat, tray table, etc. before general boarding. Instructed to board after wheelchair passengers. Waited on jet bridge behind 12 wheelchair passengers. Stopped immediately after entering plane to wait for gate agent in rear of plane cleaning a seat that was wet, got to my row and found both seats adjacent to mine already occupied, with the lack of room making it impossible for me to clean my own space and defeating the purpose of my boarding early. Cleaned the armrests and tray table as best I could.

Everything you need to know for your flight from Boise to Illinois

Information on your arrival and departure airports