HLN - STL

$379 Find Cheap Flights from Helena to St. Louis - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$379
Typical prices: $343-$719
United Airlines
Sat 1/6Tue 1/9
HLN - STL • 1 stop
Top layover airports
Denver Intl (DEN)
Cheapest • Avg $495 (round-trip)
Salt Lake City (SLC)
Shortest trip • 6h 16m (one-way)
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Cheap Flights from Helena to St. Louis (HLN-STL)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Helena to St. Louis

Wed, Jan 6 - Sat, Jan 9
United Airlines Logo
6:15 am - 1:21 pmHLN  Helena-STL Lambert-St Louis
6h 06m1 stop Denver Intl
United Airlines Logo
4:30 pm - 9:32 pmSTL  Lambert-St Louis-HLN Helena
6h 02m1 stop Denver Intl
$379United Airlines
Wed, Jan 6 - Sat, Jan 9
United Airlines Logo
6:15 am - 5:50 pmHLN  Helena-STL Lambert-St Louis
10h 35m2 stops Denver Intl Chicago O'Hare Intl
United Airlines Logo
8:52 am - 1:40 pmSTL  Lambert-St Louis-HLN Helena
5h 48m1 stop Denver Intl
$384United Airlines
Wed, Jan 6 - Sat, Jan 9
United Airlines Logo
6:15 am - 4:18 pmHLN  Helena-STL Lambert-St Louis
9h 03m2 stops Denver Intl Chicago O'Hare Intl
United Airlines Logo
5:02 am - 1:40 pmSTL  Lambert-St Louis-HLN Helena
9h 38m2 stops Chicago O'Hare Intl Denver Intl
$389United Airlines
Thu, Nov 12 - Sun, Nov 15
Delta Logo
7:00 am - 1:30 pmHLN  Helena-STL Lambert-St Louis
5h 30m1 stop Salt Lake City
Delta Logo
7:08 am - 12:27 pmSTL  Lambert-St Louis-HLN Helena
6h 19m1 stop Salt Lake City
$449Delta
Thu, Nov 12 - Sun, Nov 15
Delta Logo
7:00 am - 5:14 pmHLN  Helena-STL Lambert-St Louis
9h 14m2 stops Salt Lake City Detroit Metropolitan Wayne County
Delta Logo
7:08 am - 12:27 pmSTL  Lambert-St Louis-HLN Helena
6h 19m1 stop Salt Lake City
$454Delta
Wed, Nov 11 - Sun, Nov 15
Delta Logo
7:00 am - 1:30 pmHLN  Helena-STL Lambert-St Louis
5h 30m1 stop Salt Lake City
Delta Logo
7:08 am - 12:27 pmSTL  Lambert-St Louis-HLN Helena
6h 19m1 stop Salt Lake City
$484Delta
Sat, Jan 30 - Wed, Feb 3
United Airlines Logo
2:27 pm - 8:38 pmHLN  Helena-STL Lambert-St Louis
5h 11m1 stop Denver Intl
United Airlines Logo
8:52 am - 1:40 pmSTL  Lambert-St Louis-HLN Helena
5h 48m1 stop Denver Intl
$489United Airlines
Wed, Nov 11 - Sun, Nov 15
Delta Logo
1:07 pm - 11:22 pmHLN  Helena-STL Lambert-St Louis
9h 15m2 stops Salt Lake City Minneapolis St Paul
Delta Logo
7:08 am - 12:27 pmSTL  Lambert-St Louis-HLN Helena
6h 19m1 stop Salt Lake City
$489Delta
Thu, Nov 12 - Sun, Nov 15
Delta Logo
7:00 am - 5:14 pmHLN  Helena-STL Lambert-St Louis
9h 14m2 stops Salt Lake City Detroit Metropolitan Wayne County
Delta Logo
3:30 pm - 10:26 pmSTL  Lambert-St Louis-HLN Helena
7h 56m2 stops Minneapolis St Paul Salt Lake City
$809Delta
Booking Insights

Price, demand and travel trends for Helena to St. Louis flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

How much is a round-trip flight from Helena to St. Louis?

Round-trip flights from Helena to St. Louis typically range from $343 to $719. The lowest price found in the past 5 days was $379, on United Airlines.

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Key details for Helena to St. Louis flights

Cheapest flight

$379
Round-trip flight from Helena to St. Louis

When to book flights from Helena to St. Louis

Are your dates flexible? Find out the best times to travel from Helena to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Your Helena to St. Louis flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • What cabin classes can I book on flights from Helena to St. Louis?

    Only Economy Class is available on flights from Helena to St. Louis.

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

    There are currently no nonstop flights available from Helena to St. Louis. Flights with 1 layover take between 5h 33m and 21h 28m in total, depending on the connection.

  • Do I need a passport to fly from Helena to St. Louis?

    No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

  • Have flight prices from Helena to St. Louis changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $379 to $809. That means the highest observed fare was about 2x higher than the lowest one.

  • What car rental options are available at Lambert-St Louis Airport (STL)?

    Lambert-St Louis Airport (STL) hosts 5 major car rental companies, with daily rates averaging $78 for economy cars. Top options include:

    • Hertz
    • Budget
    • Alamo
    • Enterprise Rent-A-Car
    • Payless

  • Which airports can I use when flying from Helena to St. Louis?

    Flights from Helena to St. Louis usually depart from Helena (HLN) and arrive at Lambert-St Louis (STL).

  • Which airports do connecting flights from Helena to St. Louis pass through?

    One-stop flights from Helena to St. Louis most commonly connect through:

    • Denver Intl (DEN) - 56% of one-stop connections
    • Salt Lake City (SLC) - 33% of one-stop connections
    • Seattle/Tacoma Intl (SEA) - 11% of one-stop connections

  • Can I save money by using flexible dates for flights from Helena to St. Louis?

    Yes. Flexible dates can save you up to 76% on flights from Helena to St. Louis. Wednesday is the cheapest departure day at $289 round-trip on average, while Saturday is the most expensive at $1,172, a difference of $883.

    KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • How much time can I save by choosing a different layover airport from Helena to St. Louis?

    Flying via Denver Intl (DEN) gives the shortest average 1-stop total travel time at 5h 33m, compared with 6h 16m via Salt Lake City (SLC) and 21h 28m via Seattle/Tacoma Intl (SEA).

  • What is the time difference between Helena and St. Louis?

    St. Louis is 1 hour ahead of Helena (Central Time vs Mountain Time). Plan for the time shift when scheduling connections or first-day activities.

  • What popular places can I visit in St. Louis?

    Some of the most popular sights in St. Louis are Busch Stadium, Enterprise Center and America's Center Convention Complex. These are among the most viewed places in St. Louis on KAYAK.

Your guide to booking Helena to St. Louis flights

Get tips on when to book, when to fly and what to know before your trip.

More options for your flight from Helena to St. Louis

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