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Cheap flights from Illinois to Helena from $343

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Helena departing on 12/14. 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 Illinois to Helena

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
7:20 am - 12:25 pmORD-HLN
6h 05m1 stop
Delta Logo
5:30 am - 12:40 pmHLN-ORD
6h 10m1 stop
$343Delta
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Sun, Dec 14 - Wed, Dec 17
Alaska Airlines Logo
7:00 am - 3:59 pmORD-HLN
9h 59m1 stop
Alaska Airlines Logo
4:36 pm - 2:11 pmHLN-ORD
20h 35m1 stop
$353Alaska Airlines
Find Deal
Thu, Mar 5 - Mon, Mar 9
Delta Logo
6:30 am - 12:25 pmSTL-HLN
6h 55m1 stop
Delta Logo
1:06 pm - 7:10 pmHLN-STL
5h 04m1 stop
$373Delta
Find Deal
Fri, Dec 5 - Fri, Dec 12
Delta Logo
9:30 am - 10:30 pmSTL-HLN
14h 00m2 stops
Delta Logo
1:06 pm - 7:10 pmHLN-STL
5h 04m1 stop
$378Delta
Find Deal
Fri, Dec 5 - Fri, Dec 12
Alaska Airlines Logo
6:50 pm - 3:43 pmORD-HLN
21h 53m1 stop
Alaska Airlines Logo
4:10 pm - 1:04 pmHLN-ORD
19h 54m2 stops
$383Alaska Airlines
Find Deal
Thu, Mar 5 - Mon, Mar 9
Alaska Airlines Logo
7:00 am - 3:59 pmORD-HLN
9h 59m1 stop
Alaska Airlines Logo
4:36 pm - 2:11 pmHLN-ORD
20h 35m1 stop
$385Alaska Airlines
Find Deal
Thu, Mar 5 - Mon, Mar 9
Alaska Airlines Logo
6:00 am - 5:51 pmORD-HLN
12h 51m1 stop
Alaska Airlines Logo
6:28 pm - 2:37 pmHLN-ORD
19h 09m2 stops
$393Alaska Airlines
Find Deal
Sun, Dec 14 - Wed, Dec 17
United Airlines Logo
8:40 am - 1:47 pmPIA-HLN
6h 07m1 stop
United Airlines Logo
2:30 pm - 8:56 pmHLN-PIA
5h 26m1 stop
$403United Airlines
Find Deal
Fri, Dec 12 - Mon, Dec 15
United Airlines Logo
1:15 pm - 9:22 pmPIA-HLN
9h 07m2 stops
United Airlines Logo
2:30 pm - 8:56 pmHLN-PIA
5h 26m1 stop
$442United Airlines
Find Deal
Fri, Dec 12 - Mon, Dec 15
United Airlines Logo
8:50 am - 1:27 pmPIA-HLN
5h 37m1 stop
United Airlines Logo
2:30 pm - 12:36 pmHLN-PIA
21h 06m2 stops
$518United Airlines
Find Deal
Wed, Apr 15 - Sat, Apr 18

Delta flights from Illinois to Helena

Our best Delta deals on Illinois to Helena flight tickets
Delta
Dec 14
ORD7:20 amChicago O'Hare Intl
6h 05m
1 stop
HLN12:25 pmHelena
Dec 17
HLN5:30 amHelena
6h 10m
1 stop
ORD12:40 pmChicago O'Hare Intl
$343
Find similar
Delta
Dec 5
STL6:30 amLambert-St Louis
6h 55m
1 stop
HLN12:25 pmHelena
Dec 12
HLN1:06 pmHelena
5h 04m
1 stop
STL7:10 pmLambert-St Louis
$373
Find similar
Delta
Dec 5
STL9:30 amLambert-St Louis
14h 00m
2 stops
HLN10:30 pmHelena
Dec 12
HLN1:06 pmHelena
5h 04m
1 stop
STL7:10 pmLambert-St Louis
$378
Find similar

Alaska Airlines flights from Illinois to Helena

Our best Alaska Airlines deals on Illinois to Helena flight tickets
Alaska Airlines
Mar 5
ORD7:00 amChicago O'Hare Intl
9h 59m
1 stop
HLN3:59 pmHelena
Mar 9
HLN4:36 pmHelena
20h 35m
1 stop
ORD2:11 pmChicago O'Hare Intl
$353
Find similar
Alaska Airlines
Mar 5
ORD6:50 pmChicago O'Hare Intl
21h 53m
1 stop
HLN3:43 pmHelena
Mar 9
HLN4:10 pmHelena
19h 54m
2 stops
ORD1:04 pmChicago O'Hare Intl
$383
Find similar
Alaska Airlines
Mar 5
ORD7:00 amChicago O'Hare Intl
9h 59m
1 stop
HLN3:59 pmHelena
Mar 9
HLN4:36 pmHelena
20h 35m
1 stop
ORD2:11 pmChicago O'Hare Intl
$385
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to Helena 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 November 10, 2025.
Use the filters below to find and compare flights from Illinois to Helena that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoHelena

ORD - HLN

ORDHLN

Chicago O'Hare Intl

Sun 12/14

7:20 am-12:25 pm

1 stop6h 05m

Helena

Wed 12/17

5:30 am-12:40 pm

1 stop6h 10m

$343

ChicagoHelena

ORD - HLN

ORDHLN

Chicago O'Hare Intl

Thu 3/5

7:00 am-3:59 pm

1 stop9h 59m

Helena

Mon 3/9

4:36 pm-2:11 pm

1 stop20h 35m

$353

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Fri 12/5

6:30 am-12:25 pm

1 stop6h 55m

Helena

Fri 12/12

1:06 pm-7:10 pm

1 stop5h 04m

$373

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Fri 12/5

9:30 am-10:30 pm

2 stops14h 00m

Helena

Fri 12/12

1:06 pm-7:10 pm

1 stop5h 04m

$378

ChicagoHelena

ORD - HLN

ORDHLN

Chicago O'Hare Intl

Thu 3/5

6:50 pm-3:43 pm

1 stop21h 53m

Helena

Mon 3/9

4:10 pm-1:04 pm

2 stops19h 54m

$383

ChicagoHelena

ORD - HLN

ORDHLN

Chicago O'Hare Intl

Thu 3/5

7:00 am-3:59 pm

1 stop9h 59m

Helena

Mon 3/9

4:36 pm-2:11 pm

1 stop20h 35m

$385

ChicagoHelena

ORD - HLN

ORDHLN

Chicago O'Hare Intl

Sun 12/14

6:00 am-5:51 pm

1 stop12h 51m

Helena

Wed 12/17

6:28 pm-2:37 pm

2 stops19h 09m

$393

PeoriaHelena

PIA - HLN

PIAHLN

Greater Peoria

Fri 12/12

8:40 am-1:47 pm

1 stop6h 07m

Helena

Mon 12/15

2:30 pm-8:56 pm

1 stop5h 26m

$403

PeoriaHelena

PIA - HLN

PIAHLN

Greater Peoria

Fri 12/12

1:15 pm-9:22 pm

2 stops9h 07m

Helena

Mon 12/15

2:30 pm-8:56 pm

1 stop5h 26m

$442

PeoriaHelena

PIA - HLN

PIAHLN

Greater Peoria

Wed 4/15

8:50 am-1:27 pm

1 stop5h 37m

Helena

Sat 4/18

2:30 pm-12:36 pm

2 stops21h 06m

$518

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Helena from

How to get the cheapest flight ticket from Illinois to Helena

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 day to depart on your flight to Helena?

The cheapest day to depart from Illinois to Helena is on a Wednesday. Travelers who choose to depart for Helena on a Wednesday will often find tickets for as low as $477. The most expensive day to fly to Helena is Monday, with ticket prices averaging around $1,040.

What is the cheapest time of day to depart on your flight to Helena?

According to our data, the cheapest time of day to fly to Helena is in the morning. momondo users have found flights departing from Illinois to Helena in the morning for as low as $557. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In contrast, the most expensive time of day to depart to Helena is in the afternoon when prices are around $863.

Cheap Illinois to Helena flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Helena

Direct flights

None
There are no direct flights from Illinois to Helena. There are no popular flight routes from Illinois to Helena.
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  • When did momondo last update prices for flights from Illinois to Helena Airport?

    Prices for flights from Illinois to Helena Airport were last updated today.

  • How many operators does momondo search for flights from Illinois to Helena Airport?

  • How old do you have to be to fly from Illinois to Helena Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Illinois to Helena Airport.

  • What documentation or ID do you need to fly to Helena Airport?

    The travel and health documents required for your trip to Helena Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Helena Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Illinois to Helena

Compare and see reviews for airlines that fly from Illinois to Helena with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $298Free CancellationRating
7.4
9,012 reviews
Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Helena?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Illinois to Helena. momondo saves you time and could save you money on your trip.

Can I find flights from Illinois to Helena with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Illinois to Helena flights to just show those with flexible booking policies.

How can momondo help me find flights from Illinois to Helena?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Helena from Illinois.

I’m not ready to book a flight from Illinois to Helena right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Illinois to Helena 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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