$226 Cheap Delta flights St. Louis (STL) to Helena (HLN)

View $226 flight on Wed, Aug 13, 2025Opens in a new window

$226 Cheap Delta flights St. Louis (STL) to Helena (HLN)

Prices were available within the past 7 days and start at $226 for one-way flights and $401 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, Nov 8 - Wed, Nov 12
STL
St. Louis
HLN
Helena
$401 Roundtrip, found 3 hours ago
$401
Roundtrip
found 3 hours ago
Select Delta flight, departing Sat, Nov 8 from St. Louis to Helena, returning Wed, Nov 12, priced at $401 found 3 hours ago
Delta
Sat, Nov 8 - Tue, Nov 11
STL
St. Louis
HLN
Helena
$406 Roundtrip, found 3 hours ago
$406
Roundtrip
found 3 hours ago
Select Delta flight, departing Sat, Nov 8 from St. Louis to Helena, returning Tue, Nov 11, priced at $406 found 3 hours ago
Delta
Tue, Sep 9 - Fri, Sep 12
STL
St. Louis
HLN
Helena
$424 Roundtrip, found 4 days ago
$424
Roundtrip
found 4 days ago
Select Delta flight, departing Tue, Sep 9 from St. Louis to Helena, returning Fri, Sep 12, priced at $424 found 4 days ago
Delta
Thu, Nov 6 - Tue, Nov 11
STL
St. Louis
HLN
Helena
$426 Roundtrip, found 3 hours ago
$426
Roundtrip
found 3 hours ago
Select Delta flight, departing Thu, Nov 6 from St. Louis to Helena, returning Tue, Nov 11, priced at $426 found 3 hours ago
Delta
Sat, Aug 16 - Sun, Aug 31
STL
St. Louis
HLN
Helena
$433 Roundtrip, found 2 days ago
$433
Roundtrip
found 2 days ago
Select Delta flight, departing Sat, Aug 16 from St. Louis to Helena, returning Sun, Aug 31, priced at $433 found 2 days ago
Delta
Mon, Aug 18 - Sun, Aug 31
STL
St. Louis
HLN
Helena
$438 Roundtrip, found 2 days ago
$438
Roundtrip
found 2 days ago
Select Delta flight, departing Mon, Aug 18 from St. Louis to Helena, returning Sun, Aug 31, priced at $438 found 2 days ago
Flights from St. Louis (STL) to Helena (HLN)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Helena Regional
Airlines serving
Alaska Airlines
Popular airline
Alaska Airlines
Distance
1220 mi

Frequently asked questions

How much is a Delta Air Lines flight from Lambert-St. Louis Intl. Airport (STL) to Helena Regional Airport (HLN)?
Make use of the "Price (lowest to highest)" filter on Expedia to look for cheap Delta Air Lines return flights from $401 from STL to HLN. Affordable one-way options from $226 are also available.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from STL to HLN with Delta Air Lines?
Delta Air Lines flights to Helena are typically more affordable in the low-season months of December and January. Whether you're searching for a one-way or round-trip ticket, you could score a better deal then.
What is the cheapest time to book flights from Lambert-St. Louis Intl. Airport (STL) to Helena Regional Airport (HLN) with Delta Air Lines?
Start searching one to three months ahead of your departure date to find cheap fares on Delta Air Lines flights from Lambert-St. Louis Intl. Airport (STL) to Helena Regional Airport (HLN). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it's 6% cheaper on average than a Monday, the most expensive day to book.* Get the timing right, and you can enjoy significant savings on domestic trips.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does Delta Air Lines fly nonstop from Lambert-St. Louis Intl. Airport (STL) to Helena Regional Airport (HLN)?
Enter your dates, hit search and select "Nonstop" on Expedia to browse any direct flights from STL to HLN with Delta Air Lines or other carriers.
What is the earliest Delta Air Lines flight from STL to HLN?
Find Delta Air Lines's earliest flights from STL to HLN by selecting the "Morning" and "Early Morning" filters. Not only will you arrive sooner, early departures also have a 20% less chance of being canceled.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does Delta Air Lines fly into in Helena?
Take a Delta Air Lines flight from Lambert-St. Louis Intl. Airport (STL) to Helena, and you'll probably come in to Helena Regional Airport (HLN). This is the airline's primary hub in this destination.
Why fly with Delta Air Lines from STL to HLN?
Delta Air Lines makes traveling from STL to HLN more comfortable with a rewarding loyalty program and an excellent in-flight experience. You also have the chance to earn points with Delta SkyMiles. Remember to join our free One Key™ rewards program to earn OneKeyCash™*, which can be redeemed on future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my Delta Air Lines flight from Lambert-St. Louis Intl. Airport (STL) to Helena Regional Airport (HLN)?
Changes are typically free within 24 hours of making a booking, but your airline may add a charge after that. For more details about modifying your reservation, check out your "Trips," select your flight and click on "Manage Booking." If you'd like the flexibility to change your plans without additional costs, apply the "No cancel fee" or "Changes included" filter when organizing your next adventure.

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*Available to One Key members.