$159 Cheap Flights from Helena (HLN) to Ontario (ONT)

View $159 flight on Tue, Jan 6, 2026Opens in a new window

Popular airlines from Helena, MT (HLN-Helena Regional) to Los Angeles - Ontario Intl. Airport (ONT)

Cheap Flights from Helena to Ontario (HLN-ONT)

Prices were available within the past 7 days and start at $159 for one-way flights and $224 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Sat, Dec 6 - Tue, Dec 16
HLN
Helena
ONT
Ontario
$224 Roundtrip, found 4 days ago
$224
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Sat, Dec 6 from Helena to Ontario, returning Tue, Dec 16, priced at $224 found 4 days ago
Alaska Airlines
Sat, Dec 6 - Wed, Dec 17
HLN
Helena
ONT
Ontario
$244 Roundtrip, found 4 days ago
$244
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Sat, Dec 6 from Helena to Ontario, returning Wed, Dec 17, priced at $244 found 4 days ago
Alaska Airlines
Fri, Dec 5 - Wed, Dec 17
HLN
Helena
ONT
Ontario
$254 Roundtrip, found 4 days ago
$254
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Fri, Dec 5 from Helena to Ontario, returning Wed, Dec 17, priced at $254 found 4 days ago
Delta
Wed, Dec 3 - Tue, Dec 16
HLN
Helena
ONT
Ontario
$256 Roundtrip, found 4 days ago
$256
Roundtrip
found 4 days ago
Select Delta flight, departing Wed, Dec 3 from Helena to Ontario, returning Tue, Dec 16, priced at $256 found 4 days ago
Hawaiian Airlines
Sat, Dec 6 - Wed, Dec 17
HLN
Helena
ONT
Ontario
$263 Roundtrip, found 4 days ago
$263
Roundtrip
found 4 days ago
Select Hawaiian Airlines flight, departing Sat, Dec 6 from Helena to Ontario, returning Wed, Dec 17, priced at $263 found 4 days ago
Hawaiian Airlines
Fri, Dec 5 - Wed, Dec 17
HLN
Helena
ONT
Ontario
$273 Roundtrip, found 4 days ago
$273
Roundtrip
found 4 days ago
Select Hawaiian Airlines flight, departing Fri, Dec 5 from Helena to Ontario, returning Wed, Dec 17, priced at $273 found 4 days ago
Hawaiian Airlines
Thu, Dec 4 - Mon, Dec 15
HLN
Helena
ONT
Ontario
$274 Roundtrip, found 4 days ago
$274
Roundtrip
found 4 days ago
Select Hawaiian Airlines flight, departing Thu, Dec 4 from Helena to Ontario, returning Mon, Dec 15, priced at $274 found 4 days ago
Alaska Airlines
Wed, Dec 3 - Tue, Dec 16
HLN
Helena
ONT
Ontario
$280 Roundtrip, found 4 days ago
$280
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Wed, Dec 3 from Helena to Ontario, returning Tue, Dec 16, priced at $280 found 4 days ago
Hawaiian Airlines
Tue, Jan 20 - Tue, Jan 27
HLN
Helena
ONT
Ontario
$282 Roundtrip, found 5 days ago
$282
Roundtrip
found 5 days ago
Select Hawaiian Airlines flight, departing Tue, Jan 20 from Helena to Ontario, returning Tue, Jan 27, priced at $282 found 5 days ago
United
Sat, Jan 17 - Sat, Jan 24
HLN
Helena
ONT
Ontario
$319 Roundtrip, found 4 days ago
$319
Roundtrip
found 4 days ago
Select United flight, departing Sat, Jan 17 from Helena to Ontario, returning Sat, Jan 24, priced at $319 found 4 days ago

Alternative airports near Ontario

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to John Wayne SNA. Average driving time to city center is 42 minutes. Flights from $506
SNA
John Wayne
Average driving time to city center42 min
Flights from $506

Frequently asked questions

How much does a flight from Helena Regional Airport (HLN) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Snag a cheap one-way flight from $159 or cheap return flight from $224 from Helena Regional Airport (HLN) to Los Angeles - Ontario Intl. Airport (ONT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Helena Regional Airport (HLN) to Los Angeles - Ontario Intl. Airport (ONT)?
Planning your getaway for December can help you save, as it's the cheapest month for flights between HLN and ONT. You'll usually find the lowest prices during off-peak months.
What is the cheapest airline that flies from Helena Regional Airport (HLN) to Los Angeles - Ontario Intl. Airport (ONT)?
Use the filter tool on Expedia to compare different airlines and find the most affordable carrier that'll take you from HLN to ONT. Then, sort your results by "Price (lowest to highest)" to snag a great deal.
How many flights per day from Helena Regional Airport (HLN) to Los Angeles - Ontario Intl. Airport (ONT)?
You'll have to hop on a flight with a layover if you're traveling from Helena Regional Airport (HLN) to Los Angeles - Ontario Intl. Airport (ONT). There are no daily direct flights on this route. However, simply filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from HLN to ONT?
You'll generally find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Helena Regional Airport (HLN) to Los Angeles - Ontario Intl. Airport (ONT)?
Select a flight from Helena Regional Airport (HLN) to Los Angeles - Ontario Intl. Airport (ONT) that leaves before 3 PM to reduce the risk of delays and cancellations. Departures after this time have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Helena Regional Airport (HLN) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Holding off until just before your trip to book your flight from HLN to ONT generally means paying more. While you may come across some last-minute discounts, they aren't always guaranteed. Allow some flexibility in your schedule for the best chance of getting a bargain.
Is it cheaper to book a HLN to ONT flight and hotel package?
Booking a HLN to ONT flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Pick from our wide range of hotels and then add activities, car rentals and flights to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Helena Regional Airport (HLN) to Los Angeles - Ontario Intl. Airport (ONT)?
If you reserved your HLN to ONT flight in the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the ticket type you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Helena Regional
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, Delta, United
Roundtrip price
$224
Distance
915 mi

Book with confidence

Helena to Ontario Flights

The cheapest times to fly from Helena to Ontario

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Helena to Ontario are during the month of December. You can find some of the cheapest flights from Helena to Ontario with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Helena to Ontario

Sunday is one of the best days to book for cheap flights from Helena to Ontario: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Helena to Ontario

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Helena to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $159 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Helena to Ontario flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Helena to Ontario airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Helena to Ontario Flights

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*Available to One Key members.