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$402+ Cheap flights from Helena to St. Louis (HLN - STL)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/28. Fares are subject to change and may not be available on all flights or dates of travel.
HLN — STL
Jan 16 — Jan 231
Fri 1/16
Fri 1/23
1 adult, Economy
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Cheap flight deals from Helena to St. Louis

Best flights from Helena to St. Louis
Discover carefully curated flight deals from Helena to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 17, 2025.

This Alaska Airlines deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/286:48 pmHLN - STL
1 stop18h 06mAlaska Airlines
Sat 1/316:19 pmSTL - HLN
1 stop24h 52mAlaska Airlines
Deal found 12/15$402
This United Airlines deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/286:15 amHLN - STL
2 stops8h 48mUnited Airlines
Sat 1/318:45 amSTL - HLN
1 stop13h 41mUnited Airlines
Deal found 12/16$546

Find flight deals from Helena to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Helena (HLN) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 17, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$402
(Alaska Airlines)
Provider with most accurate pricing for Helena-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Helena-Lambert-St Louis flights.
Search Deals
From Helena to Lambert-St Louis
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Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated December 17, 2025.
Use the filters below to find and compare flights from Helena to St. Louis that are best for you.

Fly from

Helena

Fly to

St. Louis

Route

Depart

Return

Price

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Wed 1/28

6:48 pm-1:54 pm

1 stop18h 06m

Lambert-St Louis

Sat 1/31

6:19 pm-6:11 pm

1 stop24h 52m

$402

HelenaSt. Louis

HLN - STL

HLNSTL

Helena

Wed 1/28

6:15 am-4:03 pm

2 stops8h 48m

Lambert-St Louis

Sat 1/31

8:45 am-9:26 pm

1 stop13h 41m

$546

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Compare providers for flights from Helena to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Helena to St. Louis in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Helena-St. Louis flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Helena-St. Louis flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Helena-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Helena-St. Louis flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Helena-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Helena to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Helena with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Helena to St. Louis

What is the cheapest month to book a flight from Helena to St. Louis?

Currently, December is the cheapest month in which you can book a flight from Helena to St. Louis (average of $210). Flying from Helena to St. Louis in May is currently the most expensive (average of $368). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Find useful and relevant information for your journey from Helena to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Helena to St. Louis?

    Airlines like Alaska Airlines and United Airlines fly from Helena to St. Louis in about 8h 48m. The time it takes to get you to your destination can typically vary by up to 9h 18m. Airlines will cover a distance of 1218 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • Can I find deals for flights from Helena to St. Louis that include hotel bookings?

    Yes. In addition to deals on Helena to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Helena to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Helena to St. Louis.

  • Can I find deals for business class flights from Helena to St. Louis?

    Yes. Cheapflights offers flight deals from Helena to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Helena to St. Louis?

    Currently, December is the cheapest month in which you can book a flight from Helena to St. Louis (average of $210). Flying from Helena to St. Louis in May is currently the most expensive (average of $368). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Swansea
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

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