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Cheap flights from Helena to St. Louis from $404

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Helena to St. Louis departing on 6/12. 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 Helena to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
2:29 pm - 8:39 pm
HLN
-
STL
5h 10m
1 stop
United Airlines Logo
4:40 pm - 9:16 pm
STL
-
HLN
5h 36m
1 stop
$419United Airlines
Tue, Aug 25 - Sat, Aug 29
Delta Logo
1:03 pm - 11:59 pm
HLN
-
STL
9h 56m
2 stops
Delta Logo
1:59 pm - 10:33 pm
STL
-
HLN
9h 34m
2 stops
$454Delta
Thu, May 28 - Sun, May 31
United Airlines Logo
2:29 pm - 8:39 pm
HLN
-
STL
5h 10m
1 stop
United Airlines Logo
7:01 am - 9:16 pm
STL
-
HLN
15h 15m
2 stops
$469United Airlines
Tue, Aug 25 - Sat, Aug 29
Alaska Airlines Logo
4:43 pm - 8:50 am
HLN
-
STL
15h 07m
2 stops
Alaska Airlines Logo
7:41 pm - 4:06 pm
STL
-
HLN
21h 25m
1 stop
$495Alaska Airlines
Thu, Jun 4 - Sun, Jun 7
United Airlines Logo
2:20 pm - 9:10 pm
HLN
-
STL
5h 50m
1 stop
United Airlines Logo
4:48 pm - 9:20 pm
STL
-
HLN
5h 32m
1 stop
$516United Airlines
Fri, May 22 - Tue, May 26
Alaska Airlines Logo
4:43 pm - 6:45 pm
HLN
-
STL
25h 02m
1 stop
Alaska Airlines Logo
7:41 pm - 4:06 pm
STL
-
HLN
21h 25m
1 stop
$546Alaska Airlines
Thu, Jun 4 - Sun, Jun 7
Alaska Airlines Logo
4:43 pm - 8:50 am
HLN
-
STL
15h 07m
2 stops
Alaska Airlines Logo
5:33 pm - 4:06 pm
STL
-
HLN
23h 33m
2 stops
$561Alaska Airlines
Thu, Jun 4 - Sun, Jun 7
Delta Logo
1:03 pm - 7:03 pm
HLN
-
STL
5h 00m
1 stop
Delta Logo
1:59 pm - 10:33 pm
STL
-
HLN
9h 34m
2 stops
$564Delta
Thu, May 28 - Sun, May 31
United Airlines Logo
6:15 am - 9:22 pm
HLN
-
STL
14h 07m
2 stops
United Airlines Logo
7:01 am - 9:16 pm
STL
-
HLN
15h 15m
2 stops
$574United Airlines
Tue, Aug 25 - Sat, Aug 29
Alaska Airlines Logo
4:43 pm - 3:16 pm
HLN
-
STL
21h 33m
1 stop
Alaska Airlines Logo
7:41 pm - 4:06 pm
STL
-
HLN
21h 25m
1 stop
$649Alaska Airlines
Thu, May 28 - Sun, May 31

Delta flights from Helena to St. Louis

Our best Delta deals on Helena to St. Louis flight tickets
Delta
May 28
HLN1:03 pmHelena
9h 56m
2 stops
STL11:59 pmLambert-St Louis
May 31
STL1:59 pmLambert-St Louis
9h 34m
2 stops
HLN10:33 pmHelena
$454
Delta
May 28
HLN1:03 pmHelena
5h 00m
1 stop
STL7:03 pmLambert-St Louis
May 31
STL1:59 pmLambert-St Louis
9h 34m
2 stops
HLN10:33 pmHelena
$564
Delta
May 14
HLN1:03 pmHelena
5h 00m
1 stop
STL7:03 pmLambert-St Louis
May 17
STL7:00 amLambert-St Louis
6h 23m
1 stop
HLN12:23 pmHelena
$823

United Airlines flights from Helena to St. Louis

Our best United Airlines deals on Helena to St. Louis flight tickets
United Airlines
Aug 25
HLN2:29 pmHelena
5h 10m
1 stop
STL8:39 pmLambert-St Louis
Aug 29
STL4:40 pmLambert-St Louis
5h 36m
1 stop
HLN9:16 pmHelena
$419
United Airlines
Aug 25
HLN2:29 pmHelena
5h 10m
1 stop
STL8:39 pmLambert-St Louis
Aug 29
STL7:01 amLambert-St Louis
15h 15m
2 stops
HLN9:16 pmHelena
$469
United Airlines
May 22
HLN2:20 pmHelena
5h 50m
1 stop
STL9:10 pmLambert-St Louis
May 26
STL4:48 pmLambert-St Louis
5h 32m
1 stop
HLN9:20 pmHelena
$516

momondo Fare Finder

 
Customize your flight search to find flights from Helena to St. Louis 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 May 8, 2026.
Use the filters below to find and compare flights from Helena to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Tue 8/25

2:29 pm-8:39 pm

1 stop5h 10m

Lambert-St Louis

Sat 8/29

4:40 pm-9:16 pm

1 stop5h 36m

$419

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Thu 5/28

1:03 pm-11:59 pm

2 stops9h 56m

Lambert-St Louis

Sun 5/31

1:59 pm-10:33 pm

2 stops9h 34m

$454

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Tue 8/25

2:29 pm-8:39 pm

1 stop5h 10m

Lambert-St Louis

Sat 8/29

7:01 am-9:16 pm

2 stops15h 15m

$469

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Thu 6/4

4:43 pm-8:50 am

2 stops15h 07m

Lambert-St Louis

Sun 6/7

7:41 pm-4:06 pm

1 stop21h 25m

$495

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Fri 5/22

2:20 pm-9:10 pm

1 stop5h 50m

Lambert-St Louis

Tue 5/26

4:48 pm-9:20 pm

1 stop5h 32m

$516

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Thu 6/4

4:43 pm-6:45 pm

1 stop25h 02m

Lambert-St Louis

Sun 6/7

7:41 pm-4:06 pm

1 stop21h 25m

$546

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Thu 6/4

4:43 pm-8:50 am

2 stops15h 07m

Lambert-St Louis

Sun 6/7

5:33 pm-4:06 pm

2 stops23h 33m

$561

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Thu 5/28

1:03 pm-7:03 pm

1 stop5h 00m

Lambert-St Louis

Sun 5/31

1:59 pm-10:33 pm

2 stops9h 34m

$564

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Tue 8/25

6:15 am-9:22 pm

2 stops14h 07m

Lambert-St Louis

Sat 8/29

7:01 am-9:16 pm

2 stops15h 15m

$574

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Thu 5/28

4:43 pm-3:16 pm

1 stop21h 33m

Lambert-St Louis

Sun 5/31

7:41 pm-4:06 pm

1 stop21h 25m

$649

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
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See travel insights to St. Louis from

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

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

United Airlines and Alaska Airlines are the most popular carriers operating from Helena to Lambert-St Louis

What airlines fly to St. Louis?

Delta, United Airlines and Southwest are the top three most popular airlines that fly to St. Louis from Helena according to our data. Delta is the first choice among our users, with 49% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 3 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

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

Fastest flight time

5h 00m

Direct flights

None
The fastest flight from Helena to St. Louis takes 5h 00m
There are no direct flights from Helena to St. Louis. There are no popular flight routes from Helena to St. Louis.
Search flight deals

Frequently asked questions about flying from Helena to St. Louis

  • 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 00m.

  • 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.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
O'Fallon
Florissant
St. Peters
Collinsville
Wentzville
Alton
Fenton
Farmington
Festus
Clayton
Eureka
Litchfield
Edwardsville
Shrewsbury
Grafton

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.

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