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Cheap flights from Helena to St. Louis from $419

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Helena to St. Louis departing on 9/1. 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
1 adult, Economy, 0 bags

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
6:15 am - 12:40 pm
HLN
-
STL
5h 25m
1 stop
United Airlines Logo
4:40 pm - 9:30 pm
STL
-
HLN
5h 50m
1 stop
$419United Airlines
Tue, Sep 1 - Sat, Sep 5
United Airlines Logo
2:35 pm - 8:46 pm
HLN
-
STL
5h 11m
1 stop
United Airlines Logo
12:59 pm - 9:30 pm
STL
-
HLN
9h 31m
2 stops
$424United Airlines
Tue, Sep 1 - Sat, Sep 5
United Airlines Logo
6:15 am - 12:40 pm
HLN
-
STL
5h 25m
1 stop
United Airlines Logo
8:40 am - 9:30 pm
STL
-
HLN
13h 50m
2 stops
$485United Airlines
Wed, Aug 12 - Tue, Aug 18
United Airlines Logo
6:15 am - 3:38 pm
HLN
-
STL
8h 23m
2 stops
United Airlines Logo
12:59 pm - 9:30 pm
STL
-
HLN
9h 31m
2 stops
$490United Airlines
Tue, Sep 1 - Sat, Sep 5
Delta Logo
12:55 pm - 6:55 pm
HLN
-
STL
5h 00m
1 stop
Delta Logo
8:00 am - 12:15 pm
STL
-
HLN
5h 15m
1 stop
$504Delta
Wed, Aug 12 - Tue, Aug 18
United Airlines Logo
2:20 pm - 8:43 pm
HLN
-
STL
5h 23m
1 stop
United Airlines Logo
4:48 pm - 9:20 pm
STL
-
HLN
5h 32m
1 stop
$554United Airlines
Thu, Jul 9 - Mon, Jul 13
Alaska Airlines Logo
5:09 pm - 9:24 am
HLN
-
STL
15h 15m
2 stops
Alaska Airlines Logo
12:45 pm - 4:34 pm
STL
-
HLN
28h 49m
2 stops
$579Alaska Airlines
Wed, Aug 12 - Tue, Aug 18
United Airlines Logo
2:20 pm - 8:39 am
HLN
-
STL
17h 19m
2 stops
United Airlines Logo
4:48 pm - 9:20 pm
STL
-
HLN
5h 32m
1 stop
$782United Airlines
Fri, Jul 24 - Sun, Jul 26
Alaska Airlines Logo
5:09 pm - 4:37 pm
HLN
-
STL
22h 28m
2 stops
Alaska Airlines Logo
7:56 pm - 4:32 pm
STL
-
HLN
21h 36m
1 stop
$808Alaska Airlines
Thu, Jul 9 - Mon, Jul 13
United Airlines Logo
6:15 am - 4:33 pm
HLN
-
STL
9h 18m
1 stop
United Airlines Logo
4:48 pm - 9:20 pm
STL
-
HLN
5h 32m
1 stop
$846United Airlines
Fri, Jul 24 - Sun, Jul 26

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United Airlines flights from Helena to St. Louis

Our best United Airlines deals on Helena to St. Louis flight tickets
United Airlines
Sep 1
HLN6:15 amHelena
5h 25m
1 stop
STL12:40 pmLambert-St Louis
Sep 5
STL4:40 pmLambert-St Louis
5h 50m
1 stop
HLN9:30 pmHelena
$419
United Airlines
Sep 1
HLN2:35 pmHelena
5h 11m
1 stop
STL8:46 pmLambert-St Louis
Sep 5
STL12:59 pmLambert-St Louis
9h 31m
2 stops
HLN9:30 pmHelena
$424
United Airlines
Aug 12
HLN6:15 amHelena
5h 25m
1 stop
STL12:40 pmLambert-St Louis
Aug 18
STL8:40 amLambert-St Louis
13h 50m
2 stops
HLN9:30 pmHelena
$485

Alaska Airlines flights from Helena to St. Louis

Our best Alaska Airlines deals on Helena to St. Louis flight tickets
Alaska Airlines
Aug 12
HLN5:09 pmHelena
15h 15m
2 stops
STL9:24 amLambert-St Louis
Aug 18
STL12:45 pmLambert-St Louis
28h 49m
2 stops
HLN4:34 pmHelena
$579
Alaska Airlines
Jul 9
HLN5:09 pmHelena
22h 28m
2 stops
STL4:37 pmLambert-St Louis
Jul 13
STL7:56 pmLambert-St Louis
21h 36m
1 stop
HLN4:32 pmHelena
$808
Alaska Airlines
Jul 9
HLN5:09 pmHelena
22h 28m
2 stops
STL4:37 pmLambert-St Louis
Jul 13
STL5:37 pmLambert-St Louis
23h 55m
2 stops
HLN4:32 pmHelena
$1,003

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 June 27, 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

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Tue 9/1

6:15 am-12:40 pm

1 stop5h 25m

Lambert-St Louis

Sat 9/5

4:40 pm-9:30 pm

1 stop5h 50m

$419

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Tue 9/1

2:35 pm-8:46 pm

1 stop5h 11m

Lambert-St Louis

Sat 9/5

12:59 pm-9:30 pm

2 stops9h 31m

$424

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Wed 8/12

6:15 am-12:40 pm

1 stop5h 25m

Lambert-St Louis

Tue 8/18

8:40 am-9:30 pm

2 stops13h 50m

$485

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Tue 9/1

6:15 am-3:38 pm

2 stops8h 23m

Lambert-St Louis

Sat 9/5

12:59 pm-9:30 pm

2 stops9h 31m

$490
Quickest round-trip

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Wed 8/12

12:55 pm-6:55 pm

1 stop5h 00m

Lambert-St Louis

Tue 8/18

8:00 am-12:15 pm

1 stop5h 15m

$504

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Thu 7/9

2:20 pm-8:43 pm

1 stop5h 23m

Lambert-St Louis

Mon 7/13

4:48 pm-9:20 pm

1 stop5h 32m

$554

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Wed 8/12

5:09 pm-9:24 am

2 stops15h 15m

Lambert-St Louis

Tue 8/18

12:45 pm-4:34 pm

2 stops28h 49m

$579

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Fri 7/24

2:20 pm-8:39 am

2 stops17h 19m

Lambert-St Louis

Sun 7/26

4:48 pm-9:20 pm

1 stop5h 32m

$782

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Thu 7/9

5:09 pm-4:37 pm

2 stops22h 28m

Lambert-St Louis

Mon 7/13

7:56 pm-4:32 pm

1 stop21h 36m

$808

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Fri 7/24

6:15 am-4:33 pm

1 stop9h 18m

Lambert-St Louis

Sun 7/26

4:48 pm-9:20 pm

1 stop5h 32m

$846

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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 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 48% 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 23m

Direct flights

None
The fastest flight from Helena to St. Louis takes 5h 23m
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 23m.

  • 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
Fairview Heights
Hermann
Maryland Heights
Florissant
O'Fallon
Collinsville
St. Peters
Alton
Wentzville
Farmington
Fenton
Clayton
Festus
Eureka
Litchfield
Edwardsville
Grafton
Shrewsbury

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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