What airlines fly to St. Louis?

United Airlines, Delta and Southwest are the top three most popular airlines that fly to St. Louis from Helena according to our data. United Airlines is the first choice among our users, with 41% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 5 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

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

Prices for flights from Helena Airport to Lambert-St Louis Airport refresh daily.

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

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Helena Airport to Lambert-St Louis Airport.

What documentation or ID do you need to fly to Lambert-St Louis Airport?

The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$328 Cheap Flights from Helena to St. Louis (HLN-STL) in 2025

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Find the cheapest flights from Helena to St. Louis (HLN-STL)

Round-trip

One-way

Cheap round-trip flights

6:13 pm - 3:18 pmHLN-STL

20h 05m1 stop

7:00 am - 5:36 pmSTL-HLN

11h 36m1 stop

$475Alaska Airlines

Find Deal

Thu, Nov 13 - Sat, Nov 15

2:22 pm - 9:54 pmHLN-STL

6h 32m1 stop

10:00 am - 9:22 pmSTL-HLN

12h 22m2 stops

$513United Airlines

Find Deal

Thu, Nov 13 - Sat, Nov 15

5:40 am - 4:51 pmHLN-STL

10h 11m2 stops

10:51 am - 10:37 pmSTL-HLN

12h 46m2 stops

$527Delta

Find Deal

Thu, Nov 13 - Sat, Nov 15

5:50 am - 1:30 pmHLN-STL

6h 40m1 stop

5:30 pm - 10:13 pmSTL-HLN

5h 43m1 stop

$589Delta

Find Deal

Wed, Aug 27 - Sun, Aug 31

5:50 am - 1:30 pmHLN-STL

6h 40m1 stop

6:00 am - 12:20 pmSTL-HLN

7h 20m2 stops

$594Delta

Find Deal

Wed, Aug 27 - Sun, Aug 31

5:50 am - 2:30 pmHLN-STL

7h 40m2 stops

1:26 pm - 10:13 pmSTL-HLN

9h 47m2 stops

$599Delta

Find Deal

Wed, Aug 27 - Sun, Aug 31

6:30 am - 12:43 pmHLN-STL

5h 13m1 stop

9:17 am - 9:11 pmSTL-HLN

12h 54m2 stops

$622United Airlines

Find Deal

Thu, Aug 28 - Mon, Sep 1

6:30 am - 3:44 pmHLN-STL

8h 14m2 stops

6:35 am - 4:04 pmSTL-HLN

10h 29m2 stops

$668United Airlines

Find Deal

Thu, Aug 28 - Mon, Sep 1

Delta flights from Helena to St. Louis

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

Delta

Nov 13

HLN5:40 amHelena

10h 11m

2 stops

STL4:51 pmLambert-St Louis

Nov 15

STL10:51 amLambert-St Louis

12h 46m

2 stops

HLN10:37 pmHelena

$527

Find similar

Delta

Aug 27

HLN5:50 amHelena

6h 40m

1 stop

STL1:30 pmLambert-St Louis

Aug 31

STL5:30 pmLambert-St Louis

5h 43m

1 stop

HLN10:13 pmHelena

$589

Find similar

Delta

Aug 27

HLN5:50 amHelena

6h 40m

1 stop

STL1:30 pmLambert-St Louis

Aug 31

STL6:00 amLambert-St Louis

7h 20m

2 stops

HLN12:20 pmHelena

$594

Find similar

United Airlines flights from Helena to St. Louis

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

United Airlines

Nov 13

HLN2:22 pmHelena

6h 32m

1 stop

STL9:54 pmLambert-St Louis

Nov 15

STL10:00 amLambert-St Louis

12h 22m

2 stops

HLN9:22 pmHelena

$513

Find similar

United Airlines

Aug 28

HLN6:30 amHelena

5h 13m

1 stop

STL12:43 pmLambert-St Louis

Sep 1

STL9:17 amLambert-St Louis

12h 54m

2 stops

HLN9:11 pmHelena

$622

Find similar

United Airlines

Aug 28

HLN6:30 amHelena

8h 14m

2 stops

STL3:44 pmLambert-St Louis

Sep 1

STL6:35 amLambert-St Louis

10h 29m

2 stops

HLN4:04 pmHelena

$668

Find similar

Fly from

Fly to

Route

Depart

Return

Price

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Thu 11/13

6:13 pm-3:18 pm

1 stop20h 05m

Lambert-St Louis

Sat 11/15

7:00 am-5:36 pm

1 stop11h 36m

$475

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Thu 11/13

2:22 pm-9:54 pm

1 stop6h 32m

Lambert-St Louis

Sat 11/15

10:00 am-9:22 pm

2 stops12h 22m

$513

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Thu 11/13

5:40 am-4:51 pm

2 stops10h 11m

Lambert-St Louis

Sat 11/15

10:51 am-10:37 pm

2 stops12h 46m

$527

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Wed 8/27

5:50 am-1:30 pm

1 stop6h 40m

Lambert-St Louis

Sun 8/31

5:30 pm-10:13 pm

1 stop5h 43m

$589

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Wed 8/27

5:50 am-1:30 pm

1 stop6h 40m

Lambert-St Louis

Sun 8/31

6:00 am-12:20 pm

2 stops7h 20m

$594

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Wed 8/27

5:50 am-2:30 pm

2 stops7h 40m

Lambert-St Louis

Sun 8/31

1:26 pm-10:13 pm

2 stops9h 47m

$599

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Thu 8/28

6:30 am-12:43 pm

1 stop5h 13m

Lambert-St Louis

Mon 9/1

9:17 am-9:11 pm

2 stops12h 54m

$622

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Thu 8/28

6:30 am-3:44 pm

2 stops8h 14m

Lambert-St Louis

Mon 9/1

6:35 am-4:04 pm

2 stops10h 29m

$668

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

How to get the cheapest flight ticket from Helena to St. Louis

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 St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Friday when prices can be found for as low as $388. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $896. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Helena in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $388 when looking at flights departing in the afternoon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $644 per ticket.

When to book flights from Helena to St. Louis

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

Estimated round-trip price

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

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

Best Price Found	$475
Fastest flight time	5h 13m
Direct flights	None
Airports in St. Louis	1 airport

The best flight deal from Helena to St. Louis found on momondo in the last 72 hours is $475

The fastest flight from Helena to St. Louis takes 5h 13m

There are no direct flights from Helena to St. Louis. Popular non-direct route for this connection is Helena Airport - Lambert-St Louis Airport.

There is 1 airport near St. Louis: Lambert-St Louis (STL)

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How far is Helena to Lambert-St Louis by plane?
Helena and Lambert-St Louis are 1232.9 mi apart from one another. By plane, this route typically takes 5h 13m.
When did momondo last update prices for flights from Helena Airport to Lambert-St Louis Airport?
Prices for flights from Helena Airport to Lambert-St Louis Airport refresh daily.
How old do you have to be to fly from Helena Airport to Lambert-St Louis Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Helena Airport to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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Why use momondo?

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

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

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

Flights from Helena to St. Louis with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

momondo provides multiple filters to help you find the best flight to St. Louis from Helena. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Price alerts on flights to St. Louis from Helena are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.