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.

$339 Cheap Flights from St. Louis to Helena in 2026

Find the cheapest flights from St. Louis to Helena

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

4:40 pm - 9:30 pm

STL

HLN

5h 50m

1 stop

6:15 am - 12:40 pm

HLN

STL

5h 25m

1 stop

$339United Airlines

Tue, Aug 25 - Sat, Aug 29

12:59 pm - 9:30 pm

STL

HLN

9h 31m

2 stops

6:15 am - 12:40 pm

HLN

STL

5h 25m

1 stop

$344United Airlines

Tue, Aug 25 - Sat, Aug 29

12:59 pm - 9:30 pm

STL

HLN

9h 31m

2 stops

6:15 am - 5:06 pm

HLN

STL

9h 51m

2 stops

$349United Airlines

Tue, Aug 25 - Sat, Aug 29

7:00 am - 3:31 pm

STL

HLN

9h 31m

1 stop

4:08 pm - 11:59 pm

HLN

STL

6h 51m

1 stop

$364Alaska Airlines

Sat, Dec 5 - Wed, Dec 9

7:00 am - 3:31 pm

STL

HLN

9h 31m

1 stop

4:08 pm - 11:59 pm

HLN

STL

6h 51m

1 stop

$369Alaska Airlines

Sat, Dec 5 - Wed, Dec 9

9:00 am - 1:45 pm

STL

HLN

5h 45m

1 stop

6:15 am - 7:11 pm

HLN

STL

11h 56m

2 stops

$378United Airlines

Fri, Aug 21 - Fri, Aug 28

12:59 pm - 9:30 pm

STL

HLN

9h 31m

2 stops

6:15 am - 5:06 pm

HLN

STL

9h 51m

2 stops

$389United Airlines

Tue, Aug 25 - Sat, Aug 29

7:00 am - 3:31 pm

STL

HLN

9h 31m

1 stop

4:08 pm - 11:59 pm

HLN

STL

6h 51m

1 stop

$399Alaska Airlines

Sat, Dec 5 - Wed, Dec 9

9:30 am - 9:30 pm

STL

HLN

13h 00m

2 stops

6:15 am - 3:38 pm

HLN

STL

8h 23m

2 stops

$423United Airlines

Fri, Aug 21 - Fri, Aug 28

8:25 am - 8:59 pm

STL

HLN

13h 34m

2 stops

2:30 pm - 8:59 pm

HLN

STL

5h 29m

1 stop

$434United Airlines

Sat, Dec 5 - Wed, Dec 9

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Delta flights from St. Louis to Helena

Our best Delta deals on St. Louis to Helena flight tickets

Delta

Aug 25

STL8:00 amLambert-St Louis

5h 15m

1 stop

HLN12:15 pmHelena

Aug 29

HLN12:55 pmHelena

7h 05m

1 stop

STL9:00 pmLambert-St Louis

$899

Delta

Aug 25

STL8:00 amLambert-St Louis

5h 15m

1 stop

HLN12:15 pmHelena

Aug 29

HLN12:55 pmHelena

9h 36m

2 stops

STL11:31 pmLambert-St Louis

$1,297

United Airlines flights from St. Louis to Helena

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

United Airlines

Aug 25

STL4:40 pmLambert-St Louis

5h 50m

1 stop

HLN9:30 pmHelena

Aug 29

HLN6:15 amHelena

5h 25m

1 stop

STL12:40 pmLambert-St Louis

$339

United Airlines

Aug 25

STL12:59 pmLambert-St Louis

9h 31m

2 stops

HLN9:30 pmHelena

Aug 29

HLN6:15 amHelena

5h 25m

1 stop

STL12:40 pmLambert-St Louis

$344

United Airlines

Aug 25

STL12:59 pmLambert-St Louis

9h 31m

2 stops

HLN9:30 pmHelena

Aug 29

HLN6:15 amHelena

9h 51m

2 stops

STL5:06 pmLambert-St Louis

$349

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Tue 8/25

4:40 pm-9:30 pm

1 stop5h 50m

Helena

Sat 8/29

6:15 am-12:40 pm

1 stop5h 25m

$339

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Tue 8/25

12:59 pm-9:30 pm

2 stops9h 31m

Helena

Sat 8/29

6:15 am-12:40 pm

1 stop5h 25m

$344

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Tue 8/25

12:59 pm-9:30 pm

2 stops9h 31m

Helena

Sat 8/29

6:15 am-5:06 pm

2 stops9h 51m

$349

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Sat 12/5

7:00 am-3:31 pm

1 stop9h 31m

Helena

Wed 12/9

4:08 pm-11:59 pm

1 stop6h 51m

$364

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Sat 12/5

7:00 am-3:31 pm

1 stop9h 31m

Helena

Wed 12/9

4:08 pm-11:59 pm

1 stop6h 51m

$369

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Fri 8/21

9:00 am-1:45 pm

1 stop5h 45m

Helena

Fri 8/28

6:15 am-7:11 pm

2 stops11h 56m

$378

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Tue 8/25

12:59 pm-9:30 pm

2 stops9h 31m

Helena

Sat 8/29

6:15 am-5:06 pm

2 stops9h 51m

$389

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Sat 12/5

7:00 am-3:31 pm

1 stop9h 31m

Helena

Wed 12/9

4:08 pm-11:59 pm

1 stop6h 51m

$399

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Fri 8/21

9:30 am-9:30 pm

2 stops13h 00m

Helena

Fri 8/28

6:15 am-3:38 pm

2 stops8h 23m

$423

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Sat 12/5

8:25 am-8:59 pm

2 stops13h 34m

Helena

Wed 12/9

2:30 pm-8:59 pm

1 stop5h 29m

$434

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

What airlines fly to Helena?

United Airlines, Delta and Southwest 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 51% of people opting to fly with this airline when traveling to Helena. Keep in mind that there are 4 different airlines that fly to Helena on a routine basis, so you have a few additional options to choose from.

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	5h 27m
Direct flights	None

The fastest flight from St. Louis to Helena takes 5h 27m

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

Search flight deals

Frequently asked questions about flying from St. Louis to Helena

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 5h 27m, 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.