$124 Find Cheap Flights from Billings 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 Billings to Illinois departing on 4/13. 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 Billings 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 Billings to Illinois, as well as popular online travel agencies
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Cheap Flights from Billings to Illinois

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Chicago
Chicagononstop$251
Moline
Moline1 stop$339
St. Louis
St. Louis1 stop$339
Chicago
Chicagononstop$251
Moline
Moline1 stop$339
St. Louis
St. Louis1 stop$339

Book Cheap Billings 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 Billings 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 Billings to Illinois

Sat, Sep 5 - Tue, Sep 8
American Airlines Logo
12:28 pm - 4:19 pm
BIL
-
ORD
2h 51mnonstop
American Airlines Logo
8:46 pm - 10:59 pm
ORD
-
BIL
3h 13mnonstop
$251American Airlines
Tue, Apr 7 - Fri, Apr 10
Delta Logo
6:25 am - 5:54 pm
BIL
-
MDW
10h 29m
2 stops
Delta Logo
2:05 pm - 8:19 pm
MDW
-
BIL
7h 14m
1 stop
$274Delta
Tue, Apr 7 - Fri, Apr 10
Delta Logo
6:25 am - 5:54 pm
BIL
-
MDW
10h 29m
2 stops
Delta Logo
1:10 pm - 10:29 pm
MDW
-
BIL
10h 19m
2 stops
$280Delta
Thu, Aug 27 - Mon, Aug 31
American Airlines Logo
6:00 am - 9:51 am
BIL
-
ORD
2h 51mnonstop
American Airlines Logo
8:46 pm - 10:59 pm
ORD
-
BIL
3h 13mnonstop
$281American Airlines
Sat, May 9 - Wed, May 13
Delta Logo
6:27 am - 1:19 pm
BIL
-
MDW
5h 52m
1 stop
Delta Logo
7:13 pm - 11:06 pm
MDW
-
BIL
4h 53m
1 stop
$291Delta
Sat, May 9 - Tue, May 12
Delta Logo
5:30 am - 11:52 am
BIL
-
ORD
5h 22m
1 stop
Delta Logo
5:41 pm - 11:14 pm
ORD
-
BIL
6h 33m
1 stop
$291Delta
Sat, Apr 4 - Sat, Apr 11
United Airlines Logo
2:35 pm - 9:32 pm
BIL
-
MLI
5h 57m
1 stop
United Airlines Logo
8:54 am - 1:23 pm
MLI
-
BIL
5h 29m
1 stop
$339United Airlines
Sat, Apr 4 - Sat, Apr 11
United Airlines Logo
2:35 pm - 9:32 pm
BIL
-
MLI
5h 57m
1 stop
United Airlines Logo
1:55 pm - 8:57 pm
MLI
-
BIL
8h 02m
2 stops
$344United Airlines
Sat, Apr 11 - Tue, Apr 14
Alaska Airlines Logo
7:56 am - 11:59 pm
BIL
-
STL
15h 03m
1 stop
Alaska Airlines Logo
7:00 am - 11:58 pm
STL
-
BIL
17h 58m
1 stop
$423Alaska Airlines
Sat, Apr 11 - Tue, Apr 14
Alaska Airlines Logo
7:56 am - 11:59 pm
BIL
-
STL
15h 03m
1 stop
Alaska Airlines Logo
3:50 pm - 11:58 pm
STL
-
BIL
9h 08m
1 stop
$443Alaska Airlines
Booking Insights

KAYAK's insights & trends for Billings to Illinois flights

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

What is the cheapest Billings to Illinois flight route?

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

The cheapest ticket to Illinois from Billings found in the last 72 hours was to Chicago, at $338 round-trip. The most popular route is from Billings (BIL) to Chicago O'Hare Intl Airport (ORD), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $338.

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

The average price for all round-trip flights from Billings 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 afternoon, when round-trip flights cost $463 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 $476.

Can I save money by flying with a layover from Billings 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.

No, with an average price for the route of $321, prices are generally cheapest when you fly direct.

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

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

Your flight ticket price will generally be cheaper if you fly to Illinois on a Saturday and more expensive on a Sunday. On your return trip to Billings, you should consider flying back on a Monday, and avoid Sundays for better deals.

Good to know

Low seasonAugust
Cheapest flight$135
Best time to beat the crowds with an average 6% drop in price.
Most popular time to fly and prices are also 18% lower on average.
Flight from Billings to Chicago O'Hare Airport

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Billings 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 Billings to Illinois.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Billings 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 Billings 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 Billings 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 Billings 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 Billings 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 Billings to the following destinations at these prices or less: Chicago $245 one-way - $358 round-trip

Reviews of the top 3 airlines serving from Billings to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Billings 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 Billings 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
DeltaOverall score based on 8288 reviews
7.9Comfort
7.8Entertainment
8.1Boarding
7.2Food
8.5Crew
Airline reviews

Perhaps when you’re sitting in 1st class and the crew closes the bathroom for the pilots, there could be a notification other than holding your hands up as a blockade when you get there and you’re told the restrooms are closed please turn around … especially at night when visibility is poor and you’re met by a flight attendants with their arms up

10.0 ExcellentDebra, Mar 2026
PBI - ATL
Read more Delta reviews

Perhaps when you’re sitting in 1st class and the crew closes the bathroom for the pilots, there could be a notification other than holding your hands up as a blockade when you get there and you’re told the restrooms are closed please turn around … especially at night when visibility is poor and you’re met by a flight attendants with their arms up

First class is comfortable. Enjoyed a movie and was able to relax compared to coach.

Loved flying First Class. Very comfortable. The seat was amazing. Enjoyed a movie and was able to relax so much better than in coach.

We landed and sat on the tarmac for 45 minutes because they only have one gate at the airport and there was another plane running late so we had to wait

The WiFi was not working. That made for a long flight.

Absolutely no communication on why there's a delay and multiple flight time reschedules. I would have canceled the flight and drove back home if I known it was going to be rescheduled 3 or 4 times.

Another late night flight and MORE men belligerently drinking and yelling. I had to move from first to economy because they were so obnoxious and disruptive. Crazy to go from a cozy chair to cardboard when you were supposed to be in first. Delta allows was too much drinking which leads to belligerent behavior.

I was in first class and literally the men behind me were so aggressively loud I moved myself to economy. This has become so common on Delta - people using audio without headphones, and men on 12am / late night flights drinking and yelling to talk to each other which prevents anyone around them from resting. Pretty crazy to have to move from first to economy (poorer service, less comfort...). Wild wild. Looking into other airlines.

Love delta smaller commuter plane so no entertainment and paid wifi on MKE-LGA leg was extremely unreliable and slow

Stop changing gates. Stop cancelling flights Stop moving my seat.

Wonderful. Quick boarding. Early departure and we arrived 30 minutes early at our destination. Unfortunately, when you arrive early, there is still a departing aircraft at our gate. We had to park for 30 minutes until the gate was clear. So our early arrival was not really early at the gate. Otherwise it was a quick and smooth flight. Appreciated the efficiency.

Crew was great (professional, attentive, prompt). Snacks for 4 hrs flight is deplorable.

United Airlines is my preferred airlines and I am thankful for Gary who also help support me on the phone to switch my flight literally last min.

Seated dude next to me even though lots of empty rows. But main thing was we sat on the tarmac after landing for 30 minutes because of, in the words of the dude who sat next to me, “operational incompetence”. We got changing directions about where to pick up gate checked bags. Pilot and flight attendant were awesome though.

It was a pretty standard flight... until the almost hour and a half spent on the taxi way. I get that the weather has been poor but the delay had nothing to do with the weather and more to do with a plane with several issues tying up the gate. I get that that happens from time to time but this has been EVERY flight I've been on for the past 5 years and I fly 3 to 5 times a year. This isn't just United... it's American, it's Delta. It's an issue with the entire industry. I work for UPS and packages on a cargo plane get better service than people do these days. Anymore I HATE flying.

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

There was no inflight service. Once we landed we were delayed to find a gate for an hour and a half which was 1/2 the total time in the air.

The chicken wrap was tiny ($13 for what looked like a 1/3 of a normal wrap?) and disgusting.

It was good experience this time. The flight was on time.

There was a delay with the plan which cause the flight to leave later and once arrived in Chicago there was another delay and some passengers missed their connecting flights

The gate agent had a really bad attitude and refused to help me get on the standby list. She just handed me a card and said I needed to call a number. I asked her to help with the AA app on my phone and she just shrugged and said she didnt know. After a few phone calls, I eventually just went to a different gate agent on the other side of the terminal and got the help I needed.

Overall, my last three trips on American Airlines have all been either delayed or "rescheduled" due to mechanical issues. At least on delay caused me to miss two possible connecting flights each later than the first. My last option for my last connection required the assistance of the onsite service desk (O'Hare Airport). The wait time for the service desk was such that it jeopardized getting booked on the last connecting flight available for the night. Suffice it to say, my latest experiences with American Airlines have caused me extensive loss of productive business and personal time and can therefore be classified as significantly less than satisfactory.

Waiting for gate in RDU for more than 20mins is crazy.

American Airlines was great and worked very hard to change my ticket so I could get an earlier, direct flight back to Dallas. However, I was informed that Kayak made mistakes with my itinerary and classified my ticket as desiring to be on the earlier flight instead of taking the necessary step of calling AA to get me on the standby list. This ended up keeping me from being added to the standby list and delayed me getting home by 6 hours. I am happy to discuss this further with Kayak so they can correct their procedures so this won't happen again.

Waited for oxygen tanks for 30 minutes after boarding was complete.

We flew in first class. The crew did not offer drinks before the flight took off, but they treated us well during the flight. The food was excellent. There was actually too much food served, but it was nice to have all the options.

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

Information on your arrival and departure airports