What is the cheapest airline to fly from St. Louis to Helena round-trip?

Flying on Delta is currently your cheapest option to Helena, with prices starting at $517.

What is the cheapest day to fly from St. Louis to Helena?

Travelers seeking maximum savings on their St. Louis to Helena flight should consider departing on Tuesday mornings when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in Helena ranges from 0.3 - 2.1 inches per month. June is typically the wettest month, when rainfall can reach 2.1 in. February is typically the driest time to visit Helena when rainfall is around 0.3 in.

If weather is an important factor for your trip to Helena, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 21.2 F).

What is the cheapest day to fly round-trip from St. Louis to Helena?

Users have found that flying from St. Louis to Helena on a Wednesday typically leans towards higher prices. However, this doesn’t mean you still can’t find a deal. Flexibility with other aspects of your flight can still land a great price for your trip.

What is the cheapest time of day to fly from STL to HLN?

It’s typically best to fly out from St. Louis to Helena in the morning. Doing so could potentially save you 40% on the flight price compared to flying at noon, which is usually more expensive.

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

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

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

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

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

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

$517+ Flights from St. Louis to Helena

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Cheap flight deals from St. Louis to Helena

Round-trip from	$517 (Delta)

From Lambert-St Louis to Helena

Search Deals

Find flight deals from St. Louis to Helena

Cheapest flights from St. Louis to Helena
Explore the most affordable flight options available from St. Louis to Helena. Find the lowest fares from popular airlines and budget airlines, with prices last updated on Temmuz 30, 2025.

Sal 11/257:30 amSTL - HLN

1 stop5h 54mDelta

Sal 12/25:40 amHLN - STL

1 stop6h 43mDelta

Deal found 7/29

$517

Pzt 8/45:15 amSTL - HLN

1 stop9h 43mUnited Airlines

Paz 8/105:39 pmHLN - STL

1 stop27h 11mUnited Airlines

Deal found 7/28

$895

Best flights from St. Louis to Helena
Discover carefully curated flight deals from St. Louis to Helena that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated Temmuz 30, 2025.

Sal 11/257:30 amSTL - HLN

1 stop5h 54mDelta

Sal 12/25:40 amHLN - STL

1 stop6h 43mDelta

Deal found 7/29

$517

Last-minute flights from St. Louis to Helena
Discover last-minute flight deals from St. Louis to Helena. Data last updated Temmuz 30, 2025 and is based on user searches.

Pzt 8/45:15 amSTL - HLN

1 stop9h 43mUnited Airlines

Paz 8/105:39 pmHLN - STL

1 stop27h 11mUnited Airlines

Deal found 7/28

$895

Fly from

Fly to

Route

Depart

Return

Price

St. LouisHelena

STL - HLN

STLHLN

Lambert-St Louis

Sal 11/25

7:30 am-12:24 pm

1 stop5h 54m

Helena

Sal 12/2

5:40 am-1:23 pm

1 stop6h 43m

$517

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

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

Have a flexible travel schedule? Discover the best time to fly to Helena from St. Louis 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 St. Louis to Helena

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

Currently, February is the cheapest month in which you can book a flight from St. Louis to Helena (average of $353). Flying from St. Louis to Helena in May is currently the most expensive (average of $517). 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.

Reviews of airlines servicing Helena

Peruse reviews from past customers who have flown with Delta from St. Louis to Helena to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,980 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very good

7,980 reviews

Delta

8.0

Very good

7,980 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

What is the cheapest airline to fly from St. Louis to Helena round-trip?
Flying on Delta is currently your cheapest option to Helena, with prices starting at $517.
Can I find deals for flights from St. Louis to Helena that include hotel bookings?
Yes. In addition to deals on St. Louis to Helena flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to Helena?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Helena.
Can I find deals for business class flights from St. Louis to Helena?
Yes. Cheapflights offers flight deals from St. Louis to Helena 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 St. Louis to Helena?
Currently, February is the cheapest month in which you can book a flight from St. Louis to Helena (average of $353). Flying from St. Louis to Helena in May is currently the most expensive (average of $517). 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.

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$517+ Cheap flights from St. Louis to Helena (STL - HLN)

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 11/25. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Helena with Cheapflights

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Cheap flight deals from St. Louis to Helena

Round-trip from

Find flight deals from St. Louis to Helena

Cheapest flights from St. Louis to HelenaExplore the most affordable flight options available from St. Louis to Helena. Find the lowest fares from popular airlines and budget airlines, with prices last updated on Temmuz 30, 2025.

Explore the most affordable flight options available from St. Louis to Helena. Find the lowest fares from popular airlines and budget airlines, with prices last updated on Temmuz 30, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Helena that are best for you.

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

Have a flexible travel schedule? Discover the best time to fly to Helena from St. Louis with our price prediction graph.

Cheapflights Insights

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

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

Reviews of airlines servicing Helena

Peruse reviews from past customers who have flown with Delta from St. Louis to Helena to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

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

What is the cheapest airline to fly from St. Louis to Helena round-trip?

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

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

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

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

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Cheapest flights from St. Louis to Helena
Explore the most affordable flight options available from St. Louis to Helena. Find the lowest fares from popular airlines and budget airlines, with prices last updated on Temmuz 30, 2025.