What is the cheapest airline that flies from Lambert-St Louis to Helena?

United Airlines is the most popular carrier operating from Lambert-St Louis to Helena

What airlines fly to Helena?

United Airlines, American Airlines and Delta are the top three most popular airlines that fly to Helena from St. Louis according to our data. United Airlines is the first choice among our users, with 36% of people opting to fly with this airline when traveling to Helena. Keep in mind that there are 5 different airlines that fly to Helena on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Lambert-St Louis Airport to Helena Airport?

Prices for flights from Lambert-St Louis Airport to Helena Airport are refreshed on a daily basis.

How old do you have to be to fly from Lambert-St Louis Airport to Helena Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Helena Airport.

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

The necessary travel and health documents for your Helena Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$315 Cheap Flights from St. Louis to Helena in 2025/26

1 adult

0 bags

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from St. Louis to Helena

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

2:50 pm - 6:11 pm

STL

HLN

28h 21m1 stop

6:48 pm - 1:54 pm

HLN

STL

18h 06m1 stop

$442Alaska Airlines

Wed, Feb 4 - Sat, Feb 7

7:04 am - 6:11 pm

STL

HLN

12h 07m2 stops

6:48 pm - 1:54 pm

HLN

STL

18h 06m1 stop

$529Alaska Airlines

Wed, Feb 4 - Sat, Feb 7

7:04 am - 6:11 pm

STL

HLN

12h 07m2 stops

6:48 pm - 7:29 pm

HLN

STL

23h 41m2 stops

$534Alaska Airlines

Wed, Feb 4 - Sat, Feb 7

2:45 pm - 9:31 pm

STL

HLN

7h 46m1 stop

2:26 pm - 10:22 pm

HLN

STL

6h 56m1 stop

$590United Airlines

Tue, Dec 23 - Sat, Dec 27

9:55 am - 9:31 pm

STL

HLN

12h 36m2 stops

2:26 pm - 10:22 pm

HLN

STL

6h 56m1 stop

$716United Airlines

Tue, Dec 23 - Sat, Dec 27

11:05 am - 9:31 pm

STL

HLN

11h 26m2 stops

6:10 am - 10:43 pm

HLN

STL

15h 33m2 stops

$905United Airlines

Tue, Dec 23 - Sat, Dec 27

Alaska Airlines flights from St. Louis to Helena

Our best Alaska Airlines deals on St. Louis to Helena flight tickets

Alaska Airlines

Feb 4

STL2:50 pmLambert-St Louis

28h 21m

1 stop

HLN6:11 pmHelena

Feb 7

HLN6:48 pmHelena

18h 06m

1 stop

STL1:54 pmLambert-St Louis

$442

Find similar

Alaska Airlines

Feb 4

STL7:04 amLambert-St Louis

12h 07m

2 stops

HLN6:11 pmHelena

Feb 7

HLN6:48 pmHelena

18h 06m

1 stop

STL1:54 pmLambert-St Louis

$529

Find similar

Alaska Airlines

Feb 4

STL7:04 amLambert-St Louis

12h 07m

2 stops

HLN6:11 pmHelena

Feb 7

HLN6:48 pmHelena

23h 41m

2 stops

STL7:29 pmLambert-St Louis

$534

Find similar

United Airlines flights from St. Louis to Helena

Our best United Airlines deals on St. Louis to Helena flight tickets

United Airlines

Dec 23

STL2:45 pmLambert-St Louis

7h 46m

1 stop

HLN9:31 pmHelena

Dec 27

HLN2:26 pmHelena

6h 56m

1 stop

STL10:22 pmLambert-St Louis

$590

Find similar

United Airlines

Dec 14

STL9:00 amLambert-St Louis

5h 47m

1 stop

HLN1:47 pmHelena

Dec 21

HLN2:26 pmHelena

6h 56m

1 stop

STL10:22 pmLambert-St Louis

$658

Find similar

United Airlines

Dec 14

STL10:00 amLambert-St Louis

12h 22m

2 stops

HLN9:22 pmHelena

Dec 21

HLN2:26 pmHelena

6h 56m

1 stop

STL10:22 pmLambert-St Louis

$663

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Wed 2/4

2:50 pm-6:11 pm

1 stop28h 21m

Helena

Sat 2/7

6:48 pm-1:54 pm

1 stop18h 06m

$442

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Wed 2/4

7:04 am-6:11 pm

2 stops12h 07m

Helena

Sat 2/7

6:48 pm-1:54 pm

1 stop18h 06m

$529

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Wed 2/4

7:04 am-6:11 pm

2 stops12h 07m

Helena

Sat 2/7

6:48 pm-7:29 pm

2 stops23h 41m

$534

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Tue 12/23

2:45 pm-9:31 pm

1 stop7h 46m

Helena

Sat 12/27

2:26 pm-10:22 pm

1 stop6h 56m

$590

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Tue 12/23

9:55 am-9:31 pm

2 stops12h 36m

Helena

Sat 12/27

2:26 pm-10:22 pm

1 stop6h 56m

$716

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Tue 12/23

11:05 am-9:31 pm

2 stops11h 26m

Helena

Sat 12/27

6:10 am-10:43 pm

2 stops15h 33m

$905

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Mon 12/22

2:45 pm-9:31 pm

1 stop7h 46m

$315

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Mon 12/22

9:55 am-9:31 pm

2 stops12h 36m

$383

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Mon 12/22

7:00 am-5:55 pm

3 stops35h 55m

$1,121

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

How to get the cheapest flight ticket from St. Louis 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

Prices

Airlines

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

The cheapest day to depart from St. Louis to Helena is on a Tuesday. Travelers who choose to depart for Helena on a Tuesday will often find tickets for as low as $448. The most expensive day to fly to Helena is Thursday, with ticket prices averaging around $760.

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 St. Louis to Helena in the morning for as low as $538. 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 $888.

When to book flights from St. Louis to Helena

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Helena according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap St. Louis to Helena (STL to HLN) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Helena

Fastest flight time	7h 46m
Direct flights	None

The fastest flight from St. Louis to Helena takes 7h 46m

There are no direct flights from St. Louis to Helena. There are no popular flight routes from St. Louis to Helena.

Search flight deals

How far is Lambert-St Louis to Helena by plane?
The distance between Lambert-St Louis and Helena is about 1232.9 mi. Flights usually cover this in 7h 46m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Lambert-St Louis Airport to Helena Airport?
Prices for flights from Lambert-St Louis Airport to Helena Airport are refreshed on a daily basis.
How old do you have to be to fly from Lambert-St Louis Airport to Helena Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Helena Airport.
What documentation or ID do you need to fly to Helena Airport?
The necessary travel and health documents for your Helena Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Helena?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from St. Louis to Helena for you.

Can I find flights from St. Louis to Helena with flexible booking policies on momondo?

momondo does allow users to show only those flights to Helena from St. Louis which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from St. Louis to Helena?

Once all potential St. Louis to Helena flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Yes momondo offers price alerts on flights to Helena from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.