$102 Find Cheap Flights from Boise to Illinois

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 3/4. 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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Cheap Flights from Boise to Illinois

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Chicago
Chicago1 stop$201
Moline
Moline1 stop$367
Peoria
Peoria1 stop$314
Bloomington
Bloomington2 stops$574
Champaign
Champaign1 stop$637
St. Louis
St. Louis2 stops$256
Chicago
Chicago1 stop$201
Moline
Moline1 stop$367
Peoria
Peoria1 stop$314
Bloomington
Bloomington2 stops$574
Champaign
Champaign1 stop$637
St. Louis
St. Louis2 stops$256

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, Feb 12 - Thu, Feb 19
Frontier Logo
12:36 pm - 11:14 pm
BOI
-
ORD
9h 38m1 stop
Frontier Logo
4:16 pm - 11:11 am
ORD
-
BOI
19h 55m1 stop
$201Frontier
Thu, Feb 12 - Thu, Feb 19
Frontier Logo
12:36 pm - 11:14 pm
BOI
-
ORD
9h 38m1 stop
Frontier Logo
4:16 pm - 11:11 am
ORD
-
BOI
19h 55m1 stop
$203Frontier
Tue, Feb 3 - Tue, Feb 10
Southwest Logo
6:05 am - 3:25 pm
BOI
-
ORD
8h 20m1 stop
Southwest Logo
2:15 pm - 10:30 pm
ORD
-
BOI
9h 15m2 stops
$209Southwest
Tue, Feb 3 - Tue, Feb 10
Southwest Logo
7:05 am - 10:35 pm
BOI
-
ORD
14h 30m2 stops
Southwest Logo
1:45 pm - 11:10 pm
ORD
-
BOI
10h 25m2 stops
$220Southwest
Sat, Feb 14 - Tue, Feb 17
Delta Logo
1:51 pm - 11:23 pm
BOI
-
STL
8h 32m2 stops
Delta Logo
7:00 am - 6:22 pm
STL
-
BOI
12h 22m2 stops
$256Delta
Thu, Feb 12 - Thu, Feb 19
Delta Logo
5:20 am - 1:05 pm
BOI
-
MDW
6h 45m1 stop
Delta Logo
6:00 am - 12:28 pm
MDW
-
BOI
7h 28m1 stop
$269Delta
Sat, May 23 - Sat, May 30
American Airlines Logo
2:58 pm - 11:42 pm
BOI
-
PIA
7h 44m1 stop
American Airlines Logo
6:00 am - 2:08 pm
PIA
-
BOI
9h 08m1 stop
$314American Airlines
Sat, Jan 17 - Sun, Jan 18
United Airlines Logo
2:37 pm - 8:58 pm
BOI
-
STL
5h 21m1 stop
United Airlines Logo
6:30 am - 12:39 pm
STL
-
BOI
7h 09m1 stop
$335United Airlines
Sat, Jan 17 - Sun, Jan 18
United Airlines Logo
10:15 am - 9:13 pm
BOI
-
STL
9h 58m2 stops
United Airlines Logo
6:30 am - 12:39 pm
STL
-
BOI
7h 09m1 stop
$340United Airlines
Sat, May 23 - Sat, May 30
American Airlines Logo
6:00 pm - 9:28 am
BOI
-
PIA
14h 28m2 stops
American Airlines Logo
6:00 am - 2:08 pm
PIA
-
BOI
9h 08m1 stop
$422American 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.

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 72 hours was to Chicago, at $268 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 72 hours was $268.

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 September, when tickets cost $324 (return) on average. On the other hand, the most expensive months are December and March, when the average cost of round-trip tickets is $391 and $389 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 3 weeks before departure, which saves you about 16% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 25 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$102
Best time to beat the crowds but there is an average 35% increase in price.
Most popular time to fly and prices are also 2% lower on average.
Flight from Boise to Chicago Midway Airport

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.

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

    The cheapest time of day to fly to Illinois is generally in the evening, when round-trip flights cost $417 on average. Morning departures are around 59% 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 $665.

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 $257 one-way - $405 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.
8.0
Alaska AirlinesOverall score based on 11634 reviews
8.1Boarding
7.8Comfort
7.0Entertainment
7.1Food
8.5Crew
Airline reviews

It was ok. First time flying with them to Boise Won’t do again

6.0 GoodAnonymous, Jan 2026
BOI - PHX
Read more Alaska Airlines reviews

It was ok. First time flying with them to Boise Won’t do again

Our late returning flight was annoying. The plane was small, but it made boarding and disembarking quicker. I do wish they offered a gluten free snack.

Dropping off of the checked bags took way longer than it should have. The agent for the pre-tagged and ready to drop off line was gone and didn't come back for about 15 minutes. The other bag check lines were barely moving. Agents were standing around and not much was getting done. Everything else about the flight was great.

I was standing in line to use the restroom. A First Class passenger wanted to use the restroom after me, but Jaques made me wait on Flight 3418 from BOI to SJC on December 12, 2025. I felt this was inappropriate and rude.

Check in online didn't accept my confirmation number so i could only check in with assistance at the airport and ended up with s creepy middle seat.

It was the most expensive Alaska Airlines ticket I’ve ever purchased. I had a middle seat with no legroom or space compared to any other middle seat I’ve hadThere was a silver box under the seat that took up 70% of my legroom on the most narrow 737 max the crew flat out would not help they would not help with bags they would not help with garbage there was no coffee,It was definitely not one of my better experiences on Alaska.

Both of my planes were delayed which is less than ideal but it's alright, unsurprising with very small flights.

Excellent, I traveled with my adult mom, she was happy for your service, especially, because you helped her with the reel chair. Only a little thing, in the airplane to Boise, the seat was very worn.

Everything was great, your crew is always very pleasant. Your airplanes are always so cold though.

I appreciated that the staff went out of the way to make sure I was taken care of.

The flight crew was extremely rude and especially not helpful when our flight was delayed.

Pretty seamless, just a tad bit late in taking off and landing.

Flight was fine other than there was a gate change that I was not notified of. By chance I happened to check my phone and saw the change, otherwise, we would have missed our connecting flight.

Haven’t flown on SW in years. Flight was on time departing and arriving. Served vegan butter onion flavored pretzels which were bad. Coke served was in a tiny paper cup. Crew was not engaging. Felt like they were going through the motions. Old plane, tight seats and no leg room.

Check-in, Boarding and flight were smooth. All the employees and crew was very nice and funny. They gave the kids crayons and workbooks to keep them occupied which was a big win. I’ve flown Southwest many times and that’s the first time I’ve seen that and it is a great addition.

Flight was on time. Wi-fi was a little spotty/slow. Boarding and exit were efficient.

Okay, not wonderful. Short flight. Wi-fi didn't work properly. Stuck waiting for a gate to open upon arrival for 20 or so minutes.

They sent a notice that they were boarding an hour early. We had to leave the club and run to the gate. They said sorry, that came from corporate and was a mistake. They did not have enough seating because the flight before it had not taken off on time. They moved our gate and delayed it for an hour.

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

I really liked the legroom. I am 6’4”.a at For some reason our seats were not together and using the app to fix it didn’t work. Passengers were nice enough to move for us but you should absolutely ensure a parent sits with their child.

Late delayed flight delays boarding and delays leaving and delays on arrival too. Cramped plane no room no food.

DTW line is too long. The flights from DTW to BWI are always delayed for unknown reasons.

Delta canceled our flight and we had to scramble to find another airline to get home. Phoenix is not a delta hub so they didn’t have another plane. It would have been a red eye though Salt Lake City. Getting in at 5am. No bueno.

This flight was no comparison to our prior flight. I'm thinking it all has to do with the age of the aircraft.

This flight was a first class choice and left much to be desired. Seat backs on seats were falling apart and torn. Seats actually didn't come to a "full & upright position". Pull out table was sprung. Not any significant leg room. All in all we were on an obviously older plane and felt overcharged for what we received as first class.

Flight was delayed several times. At one point, they "pulled back" 15 minutes from the delayed boarding and sent a text saying we would board sooner than previously advised. The flight then was delayed again. And when we boarded, there was an unspecified technical issue which had us waiting in the plane for about an hour.

Delta is a good airline. I've never had an issue with Delta. I'll continue to fly with them until they show me that I shouldn't.

The only thing nice I can say is the flight crew was really nice and apologetic about the situation. They shared as much information as they had and advised us on what we could do about missing connecting flights. The boarding process was so slow. The gate agent was working by herself and should have had someone working with her. It took almost an hour to board because she was trying to board a full flight of people and provide customer service to everyone who was flying standby and/or had questions. It was really chaotic. This didn't help the fact that we were delayed and folks were missing connections the longer it took.

The gate attendants and the crew were terrible. Because of high winds, they needed to carry more fuel, so they had to get volunteers to take the next flight at 6 am the next day. They did a terrible job of it - our flight ended up taking off just under 3 hours of the scheduled time. I hope to never fly Delta again.

Perfect flight. Smooth flight. Arrived 20 minutes early at destination. Excellent service.

The flights were on time which was great give. It was holiday travel season and there’d been some weather issues. The only complaint and this is every time with United is the terrible seat design. The head rest is not built for comfort and having my neck bent forward for a cross country trip reminded me while I try not to take United flights as a rule.

Everything was absolutely wonderful from check in to baggage claim. Staff was very professional and sweet. Will definitely recommend United to family and friends.

They did the one thing that really matters - got to Chicago early.

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

Very bad! They kept delaying my flight and wouldn’t do anything about it

Door to door, the crew and staff were amazing. It was a stressful travel day with delays, but they were focused on customers and doing what they could to get us to our destinations.

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

The boarding process needs to be fixed. The zone don't work, especially when there is hardly anyone in zones 3, 4,and 5, leaving the majority of the passengers backed up in the aisle, especially because passengers seated near the front are blocking passengers who are seated in the rear of the plane. It would also help if the size of carry on bags was more strictly enforced.

Awful. They won’t help me with anything. I booked on American but they abdicated to Iberia. The ticket was overpriced. Everything negative

I enjoyed the extra leg room compared to other airlines. The first stewards made my daughter’s birthday special by giving her an extra snack. Then the last one coming home from Chicago to Appleton made our night really enjoyable Thanks for making our trip enjoyable

It was good..clean, comfy seat. Friendly warm welcoming crew. Was able to check my cabin luggage at the gate which I was able to pickup in a decent time from baggage claim. The app gave all updates from delays to baggage claim info. Overall smooth flight.

It was a typical flight. We had a delay which seems to be the normality now. And we had no in flight service due to conditions.

After we landed we sat on the tarmac for 1.5 hours waiting to get to our gate. Ridiculous.

Terrible. Flight delayed for more than 8 hours with only a $12 meal voucher provided for the inconvenience. The airplane did not have breaks on arrival yet they still made us go through the motions and board on time knowing we could not take off then sit for 40+ minutes before having to get of the time. A complete waste of my time. I cannot believe they can stay business with these shenanigans. I’ll avoid this company like the plague moving forward as the lack of accountability is disgraceful.

This was the best 2 flights I have had with American out of SGF. Great crew both flights.

Excellent - explanations were clear staff was nice and flight was comfortable

Lost bag and 2 days no word leaving for cruise no clothes or stuff

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

Information on your arrival and departure airports