$158 Cheap Delta flights Ontario (ONT) to Helena (HLN)

View $158 flight on Tue, Sep 16, 2025Opens in a new window

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$158 Cheap Delta flights Ontario (ONT) to Helena (HLN)

Prices were available within the past 7 days and start at $158 for one-way flights and $295 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Aug 26 - Sat, Sep 6
ONT
Ontario
HLN
Helena
$295 Roundtrip, found 8 hours ago
$295
Roundtrip
found 8 hours ago
Select Delta flight, departing Tue, Aug 26 from Ontario to Helena, returning Sat, Sep 6, priced at $295 found 8 hours ago
Delta
Tue, Aug 26 - Fri, Sep 5
ONT
Ontario
HLN
Helena
$312 Roundtrip, found 8 hours ago
$312
Roundtrip
found 8 hours ago
Select Delta flight, departing Tue, Aug 26 from Ontario to Helena, returning Fri, Sep 5, priced at $312 found 8 hours ago
Delta
Tue, Sep 16 - Wed, Sep 17
ONT
Ontario
HLN
Helena
$315 Roundtrip, found 18 hours ago
$315
Roundtrip
found 18 hours ago
Select Delta flight, departing Tue, Sep 16 from Ontario to Helena, returning Wed, Sep 17, priced at $315 found 18 hours ago
Delta
Tue, Sep 16 - Wed, Sep 17
ONT
Ontario
HLN
Helena
$320 Roundtrip, found 18 hours ago
$320
Roundtrip
found 18 hours ago
Select Delta flight, departing Tue, Sep 16 from Ontario to Helena, returning Wed, Sep 17, priced at $320 found 18 hours ago
Delta
Sun, Oct 12 - Wed, Oct 22
ONT
Ontario
HLN
Helena
$322 Roundtrip, found 17 hours ago
$322
Roundtrip
found 17 hours ago
Select Delta flight, departing Sun, Oct 12 from Ontario to Helena, returning Wed, Oct 22, priced at $322 found 17 hours ago
Delta
Fri, Aug 22 - Sun, Aug 24
ONT
Ontario
HLN
Helena
$329 Roundtrip, found 6 hours ago
$329
Roundtrip
found 6 hours ago
Select Delta flight, departing Fri, Aug 22 from Ontario to Helena, returning Sun, Aug 24, priced at $329 found 6 hours ago
Flights from Ontario (ONT) to Helena (HLN)
Origin airport
Los Angeles - Ontario Intl.
Destination airport
Helena Regional
Airlines serving
Alaska Airlines, Delta, Hawaiian Airlines, United
Popular airline
Delta
Distance
915 mi

Frequently asked questions

How much is a Delta Air Lines flight from Los Angeles - Ontario Intl. Airport (ONT) to Helena Regional Airport (HLN)?
You'll find cheap round-trip Delta Air Lines flights from $295 from ONT to HLN by organizing your results from "Price (lowest to highest)" on Expedia. Or look for options from $158 for a one-way trip.**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 ONT to HLN with Delta Air Lines?
December is one of the cheapest months to travel to Helena with Delta Air Lines. You could also find excellent prices on one-way and return tickets in January.
What is the cheapest time to book flights from Los Angeles - Ontario Intl. Airport (ONT) to Helena Regional Airport (HLN) with Delta Air Lines?
Search for affordable Delta Air Lines flights from Los Angeles - Ontario Intl. Airport (ONT) to Helena Regional Airport (HLN) one to three months before your departure date. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare type and journey, the best day of the week to book a domestic flight is generally Sunday and the most expensive tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book on a Monday.**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 Los Angeles - Ontario Intl. Airport (ONT) to Helena Regional Airport (HLN)?
Enter your dates, press search and check "Nonstop" on Expedia to find any direct flights from ONT to HLN with Delta Air Lines or other carriers.
What is the earliest Delta Air Lines flight from ONT to HLN?
Sort your results by "Early Morning" and "Morning" to find the earliest departures from ONT to HLN. Leaving early means you're 20% less likely to experience cancellations.**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?
Delta Air Lines flights from Los Angeles - Ontario Intl. Airport (ONT) to Helena come in to Helena Regional Airport (HLN). This is the main entry point to this city.
Why fly with Delta Air Lines from ONT to HLN?
With an excellent in-flight experience and a rewarding loyalty program, Delta Air Lines is a popular option for many passengers flying from ONT to HLN. Also, if you're a Delta SkyMiles and One Key™ member booking with Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which can go toward 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 Los Angeles - Ontario Intl. Airport (ONT) to Helena Regional Airport (HLN)?
You can usually cancel or change your flight, although additional fees may apply if you made your booking more than 24 hours ago. Prefer to keep your options open? Use our "No cancel fee" or "Changes included" filter to find flights that won't penalize you if you need to adjust your plans. To modify your booking, head to "Trips," select your flight and click on "Manage Booking" for more details.

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