$206 Cheap Flights from St. Louis (STL) to Helena (HLN)

View $206 flight on Sat, Oct 11, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Helena, MT (HLN-Helena Regional)

Cheap Flights from St. Louis to Helena (STL-HLN)

Prices were available within the past 7 days and start at $206 for one-way flights and $411 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, Oct 11 - Sat, Nov 1
STL
St. Louis
HLN
Helena
$411 Roundtrip, found 5 hours ago
$411
Roundtrip
found 5 hours ago
Select Delta flight, departing Sat, Oct 11 from St. Louis to Helena, returning Sat, Nov 1, priced at $411 found 5 hours ago
United
Sat, Oct 11 - Sat, Nov 1
STL
St. Louis
HLN
Helena
$411 Roundtrip, found 5 hours ago
$411
Roundtrip
found 5 hours ago
Select United flight, departing Sat, Oct 11 from St. Louis to Helena, returning Sat, Nov 1, priced at $411 found 5 hours ago
Hawaiian Airlines
Tue, Oct 28 - Tue, Nov 4
STL
St. Louis
HLN
Helena
$414 Roundtrip, found 3 days ago
$414
Roundtrip
found 3 days ago
Select Hawaiian Airlines flight, departing Tue, Oct 28 from St. Louis to Helena, returning Tue, Nov 4, priced at $414 found 3 days ago
United
Sat, Oct 11 - Sat, Nov 1
STL
St. Louis
HLN
Helena
$416 Roundtrip, found 5 hours ago
$416
Roundtrip
found 5 hours ago
Select United flight, departing Sat, Oct 11 from St. Louis to Helena, returning Sat, Nov 1, priced at $416 found 5 hours ago
United
Sat, Oct 11 - Sat, Nov 1
STL
St. Louis
HLN
Helena
$418 Roundtrip, found 5 hours ago
$418
Roundtrip
found 5 hours ago
Select United flight, departing Sat, Oct 11 from St. Louis to Helena, returning Sat, Nov 1, priced at $418 found 5 hours ago
Delta
Fri, Oct 31 - Sat, Nov 1
STL
St. Louis
HLN
Helena
$431 Roundtrip, found 3 days ago
$431
Roundtrip
found 3 days ago
Select Delta flight, departing Fri, Oct 31 from St. Louis to Helena, returning Sat, Nov 1, priced at $431 found 3 days ago
United
Sat, Oct 11 - Sat, Nov 1
STL
St. Louis
HLN
Helena
$432 Roundtrip, found 5 hours ago
$432
Roundtrip
found 5 hours ago
Select United flight, departing Sat, Oct 11 from St. Louis to Helena, returning Sat, Nov 1, priced at $432 found 5 hours ago
Alaska Airlines
Tue, Oct 28 - Mon, Nov 3
STL
St. Louis
HLN
Helena
$434 Roundtrip, found 3 days ago
$434
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Tue, Oct 28 from St. Louis to Helena, returning Mon, Nov 3, priced at $434 found 3 days ago
Delta
Tue, Dec 16 - Wed, Dec 24
STL
St. Louis
HLN
Helena
$444 Roundtrip, found 3 days ago
$444
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Dec 16 from St. Louis to Helena, returning Wed, Dec 24, priced at $444 found 3 days ago
United
Mon, Oct 27 - Fri, Oct 31
STL
St. Louis
HLN
Helena
$451 Roundtrip, found 4 days ago
$451
Roundtrip
found 4 days ago
Select United flight, departing Mon, Oct 27 from St. Louis to Helena, returning Fri, Oct 31, priced at $451 found 4 days ago
Flights from St. Louis (STL) to Helena (HLN)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Helena Regional
Airlines serving
Alaska Airlines, Delta, United
Roundtrip price
$410
Distance
1220 mi

St. Louis to Helena Flights

The cheapest times to fly from St. Louis to Helena

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Helena are during the month of October. You can find some of the cheapest flights from St. Louis to Helena with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Helena

Sunday is one of the best days to book for cheap flights from St. Louis to Helena: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Helena

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Helena in 2025. You can also book with separate airlines for your outbound and return journeys, from $206 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Helena flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Helena airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Helena Regional Airport (HLN) cost?
Lock in a cheap one-way flight from $206 or cheap return flight from $411 from Lambert-St. Louis Intl. Airport (STL) to Helena Regional Airport (HLN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Helena Regional Airport (HLN)?
October is the most affordable month to fly from STL to HLN. Timing your trip outside of the busy season is often the key to finding a great deal.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Helena Regional Airport (HLN)?
To find the cheapest airline that'll fly you from STL to HLN, use Expedia's filter tool. Tailor your search based on what's important to you, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Helena Regional Airport (HLN)?
Direct flights from Lambert-St. Louis Intl. Airport (STL) to Helena Regional Airport (HLN) aren't available daily, so you'll have to take a flight with a layover. Explore your options with our filter tool. Enter your dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to HLN?
Friday is typically the busiest day for flights, while Tuesday tends to be the quietest.* Keep in mind that flight schedules can vary depending on various factors, including the time of year and carrier.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Helena Regional Airport (HLN)?
To reach Helena Regional Airport (HLN) on schedule, select a flight that leaves from Lambert-St. Louis Intl. Airport (STL) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Helena Regional Airport (HLN) last-minute?
Waiting until right before your break to book a flight from STL to HLN generally means paying more. While it's possible to find some last-minute deals, they aren't always guaranteed. Keep your travel schedule open to boost your chances of scoring a bargain.
Is it cheaper to book a STL to HLN flight and hotel package?
Compared with arranging flights and hotels separately, booking a STL to HLN flight and hotel package with Expedia could lead to significant savings. Better still, having everything in one convenient place will take the hassle out of travel planning. Just secure your flights and select from our extensive range of stays, then customize your trip with extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Helena Regional Airport (HLN)?
In most cases, you're able to reschedule or cancel your STL to HLN flight. However, there may be additional fees, especially if you made your booking over 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you want more information, head to our Customer Service portal.

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*Available to One Key members.