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Cheap flights from Helena to St. Louis from $260

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 6/20. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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
6:15 am - 2:28 pm
HLN
-
STL
7h 13m
1 stop
United Airlines Logo
4:06 pm - 9:46 pm
STL
-
HLN
6h 40m
1 stop
$429United Airlines
Sat, May 2 - Tue, May 5
United Airlines Logo
6:15 am - 2:28 pm
HLN
-
STL
7h 13m
1 stop
United Airlines Logo
9:21 am - 9:46 pm
STL
-
HLN
13h 25m
2 stops
$434United Airlines
Sat, May 2 - Tue, May 5
United Airlines Logo
6:15 am - 2:28 pm
HLN
-
STL
7h 13m
1 stop
United Airlines Logo
4:06 pm - 9:46 pm
STL
-
HLN
6h 40m
1 stop
$439United Airlines
Sat, May 2 - Tue, May 5
United Airlines Logo
6:15 am - 2:28 pm
HLN
-
STL
7h 13m
1 stop
United Airlines Logo
11:15 am - 9:46 pm
STL
-
HLN
11h 31m
2 stops
$444United Airlines
Sat, May 2 - Tue, May 5
Delta Logo
5:30 am - 1:17 pm
HLN
-
STL
6h 47m
1 stop
Delta Logo
7:00 am - 12:24 pm
STL
-
HLN
6h 24m
1 stop
$469Delta
Sun, Apr 12 - Thu, Apr 16
Alaska Airlines Logo
6:22 pm - 8:54 am
HLN
-
STL
13h 32m
2 stops
Alaska Airlines Logo
5:21 pm - 5:45 pm
STL
-
HLN
25h 24m
2 stops
$507Alaska Airlines
Sat, May 2 - Tue, May 5
Alaska Airlines Logo
6:22 pm - 8:54 am
HLN
-
STL
13h 32m
2 stops
Alaska Airlines Logo
5:20 am - 5:45 pm
STL
-
HLN
13h 25m
2 stops
$515Alaska Airlines
Sat, May 2 - Tue, May 5
Alaska Airlines Logo
6:22 pm - 8:54 am
HLN
-
STL
13h 32m
2 stops
Alaska Airlines Logo
5:20 am - 5:45 pm
STL
-
HLN
13h 25m
2 stops
$519Alaska Airlines
Sat, May 2 - Tue, May 5
United Airlines Logo
6:15 am - 11:19 pm
HLN
-
STL
16h 04m
2 stops
United Airlines Logo
10:25 am - 9:46 pm
STL
-
HLN
12h 21m
2 stops
$534United Airlines
Sat, May 2 - Tue, May 5
United Airlines Logo
6:15 am - 9:13 pm
HLN
-
STL
13h 58m
2 stops
United Airlines Logo
10:25 am - 9:46 pm
STL
-
HLN
12h 21m
2 stops
$549United Airlines
Sat, May 2 - Tue, May 5

United Airlines flights from Helena to St. Louis

Our best United Airlines deals on Helena to St. Louis flight tickets
United Airlines
May 2
HLN6:15 amHelena
7h 13m
1 stop
STL2:28 pmLambert-St Louis
May 5
STL4:06 pmLambert-St Louis
6h 40m
1 stop
HLN9:46 pmHelena
$429
United Airlines
May 2
HLN6:15 amHelena
7h 13m
1 stop
STL2:28 pmLambert-St Louis
May 5
STL9:21 amLambert-St Louis
13h 25m
2 stops
HLN9:46 pmHelena
$434
United Airlines
May 2
HLN6:15 amHelena
7h 13m
1 stop
STL2:28 pmLambert-St Louis
May 5
STL4:06 pmLambert-St Louis
6h 40m
1 stop
HLN9:46 pmHelena
$439

Alaska Airlines flights from Helena to St. Louis

Our best Alaska Airlines deals on Helena to St. Louis flight tickets
Alaska Airlines
May 2
HLN6:22 pmHelena
13h 32m
2 stops
STL8:54 amLambert-St Louis
May 5
STL5:20 amLambert-St Louis
13h 25m
2 stops
HLN5:45 pmHelena
$515
Alaska Airlines
May 2
HLN6:22 pmHelena
13h 32m
2 stops
STL8:54 amLambert-St Louis
May 5
STL5:20 amLambert-St Louis
13h 25m
2 stops
HLN5:45 pmHelena
$519

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 March 19, 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

Sat 5/2

6:15 am-2:28 pm

1 stop7h 13m

Lambert-St Louis

Tue 5/5

4:06 pm-9:46 pm

1 stop6h 40m

$429

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Sat 5/2

6:15 am-2:28 pm

1 stop7h 13m

Lambert-St Louis

Tue 5/5

9:21 am-9:46 pm

2 stops13h 25m

$434

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Sat 5/2

6:15 am-2:28 pm

1 stop7h 13m

Lambert-St Louis

Tue 5/5

4:06 pm-9:46 pm

1 stop6h 40m

$439

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Sat 5/2

6:15 am-2:28 pm

1 stop7h 13m

Lambert-St Louis

Tue 5/5

11:15 am-9:46 pm

2 stops11h 31m

$444
Quickest round-trip

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Sun 4/12

5:30 am-1:17 pm

1 stop6h 47m

Lambert-St Louis

Thu 4/16

7:00 am-12:24 pm

1 stop6h 24m

$469

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Sat 5/2

6:22 pm-8:54 am

2 stops13h 32m

Lambert-St Louis

Tue 5/5

5:21 pm-5:45 pm

2 stops25h 24m

$507

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Sat 5/2

6:22 pm-8:54 am

2 stops13h 32m

Lambert-St Louis

Tue 5/5

5:20 am-5:45 pm

2 stops13h 25m

$515

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Sat 5/2

6:22 pm-8:54 am

2 stops13h 32m

Lambert-St Louis

Tue 5/5

5:20 am-5:45 pm

2 stops13h 25m

$519

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Sat 5/2

6:15 am-11:19 pm

2 stops16h 04m

Lambert-St Louis

Tue 5/5

10:25 am-9:46 pm

2 stops12h 21m

$534

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Sat 5/2

6:15 am-9:13 pm

2 stops13h 58m

Lambert-St Louis

Tue 5/5

10:25 am-9:46 pm

2 stops12h 21m

$549

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 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?

Delta 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 47% 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

7h 13m

Direct flights

None
The fastest flight from Helena to St. Louis takes 7h 13m
There are no direct flights from Helena to St. Louis. There are no popular flight routes from Helena to St. Louis.
Search flight deals

  • 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 7h 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.

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
Florissant
Maryland Heights
O'Fallon
Collinsville
Alton
St. Peters
Wentzville
Fenton
Farmington
Clayton
Edwardsville
Festus
Eureka
Litchfield
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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