$145 Find Cheap Flights from Helena 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 Helena to Illinois departing on 5/5. 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 Helena 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 Helena to Illinois, as well as popular online travel agencies
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Cheap Flights from Helena to Illinois

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Chicago
Chicago1 stop$339
St. Louis
St. Louis1 stop$313
Chicago
Chicago1 stop$339
St. Louis
St. Louis1 stop$313

Book Cheap Helena 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 Helena 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 Helena to Illinois

Fri, Feb 20 - Thu, Feb 26
Hawaiian Airlines Logo
4:36 pm - 11:59 pm
HLN
-
STL
6h 23m
1 stop
Hawaiian Airlines Logo
7:00 am - 3:59 pm
STL
-
HLN
9h 59m
1 stop
$313Hawaiian Airlines
Sat, Feb 14 - Tue, Feb 17
United Airlines Logo
2:25 pm - 11:59 pm
HLN
-
ORD
8h 34m
1 stop
United Airlines Logo
7:10 am - 1:40 pm
ORD
-
HLN
7h 30m
1 stop
$339United Airlines
Sat, Feb 14 - Tue, Feb 17
United Airlines Logo
2:25 pm - 9:29 pm
HLN
-
ORD
6h 04m
1 stop
United Airlines Logo
7:10 am - 1:40 pm
ORD
-
HLN
7h 30m
1 stop
$374United Airlines
Fri, Feb 20 - Thu, Feb 26
Alaska Airlines Logo
4:36 pm - 11:59 pm
HLN
-
STL
6h 23m
1 stop
Alaska Airlines Logo
5:12 am - 3:59 pm
STL
-
HLN
11h 47m
2 stops
$454Alaska Airlines
Sat, Feb 14 - Tue, Feb 17
United Airlines Logo
6:15 am - 9:15 pm
HLN
-
ORD
14h 00m
2 stops
United Airlines Logo
7:10 am - 1:40 pm
ORD
-
HLN
7h 30m
1 stop
$469United Airlines
Sat, Feb 14 - Tue, Feb 17
United Airlines Logo
2:25 pm - 9:29 pm
HLN
-
ORD
6h 04m
1 stop
United Airlines Logo
3:35 pm - 1:40 pm
ORD
-
HLN
23h 05m
2 stops
$473United Airlines
Fri, Feb 20 - Thu, Feb 26
Alaska Airlines Logo
4:36 pm - 6:00 pm
HLN
-
STL
24h 24m
2 stops
Alaska Airlines Logo
8:00 am - 3:59 pm
STL
-
HLN
32h 59m
2 stops
$519Alaska Airlines
Thu, May 21 - Mon, May 25
Delta Logo
5:45 am - 12:21 pm
HLN
-
ORD
5h 36m
1 stop
Delta Logo
7:15 am - 12:23 pm
ORD
-
HLN
6h 08m
1 stop
$534Delta
Thu, May 21 - Mon, May 25
Delta Logo
5:45 am - 12:21 pm
HLN
-
ORD
5h 36m
1 stop
Delta Logo
6:00 am - 12:23 pm
ORD
-
HLN
7h 23m
2 stops
$724Delta
Fri, Feb 20 - Thu, Feb 26
Multiple Airlines Logo
4:36 pm - 1:51 pm
HLN
-
STL
20h 15m
1 stop
Multiple Airlines Logo
5:12 am - 3:59 pm
STL
-
HLN
11h 47m
2 stops
$5,792Multiple Airlines
Booking Insights

KAYAK's insights & trends for Helena to Illinois flights

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

Which airlines provide the cheapest flights from Helena to Illinois?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Helena to Illinois were found on Hawaiian Airlines ($313) and United Airlines ($339).

Good to know

Low seasonSeptember
Cheapest flight$145
Best time to beat the crowds with an average 11% drop in price.
Most popular time to fly and prices are also 4% lower on average.
Flight from Helena to Chicago O'Hare Airport

FAQs - booking Illinois flights

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

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Helena 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 Helena 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 Helena 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 Helena 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 Helena to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Helena to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Helena 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 Helena 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.
7.4
United AirlinesOverall score based on 9222 reviews
7.3Comfort
8.1Crew
7.1Entertainment
6.6Food
7.7Boarding
Airline reviews

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.

4.0 OkaySean, Jan 2026
BOS - ORD
Read more United Airlines reviews

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

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.

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

Information on your arrival and departure airports