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Cheap flights from Helena to Los Angeles from $165

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Helena to Los Angeles departing on 10/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Helena to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
7:15 am - 12:21 pmHLN  Helena-ONT Ontario
6h 06m1 stop Salt Lake City
Delta Logo
6:00 am - 12:22 pmONT  Ontario-HLN Helena
5h 22m1 stop Salt Lake City
$329Delta
Thu, Nov 5 - Mon, Nov 9
Delta Logo
1:08 pm - 10:43 pmHLN  Helena-ONT Ontario
10h 35m2 stops Salt Lake City Seattle/Tacoma Intl
Delta Logo
5:11 pm - 10:26 pmONT  Ontario-HLN Helena
4h 15m1 stop Salt Lake City
$334Delta
Thu, Nov 5 - Mon, Nov 9
Delta Logo
1:08 pm - 10:43 pmHLN  Helena-ONT Ontario
10h 35m2 stops Salt Lake City Seattle/Tacoma Intl
Delta Logo
5:11 pm - 10:26 pmONT  Ontario-HLN Helena
4h 15m1 stop Salt Lake City
$356Delta
Thu, Nov 5 - Mon, Nov 9
Delta Logo
7:15 am - 12:21 pmHLN  Helena-ONT Ontario
6h 06m1 stop Salt Lake City
Delta Logo
6:00 am - 12:22 pmONT  Ontario-HLN Helena
5h 22m1 stop Salt Lake City
$364Delta
Thu, Nov 5 - Mon, Nov 9
Delta Logo
1:08 pm - 10:43 pmHLN  Helena-ONT Ontario
10h 35m2 stops Salt Lake City Seattle/Tacoma Intl
Delta Logo
5:11 pm - 10:26 pmONT  Ontario-HLN Helena
4h 15m1 stop Salt Lake City
$369Delta
Thu, Nov 5 - Mon, Nov 9
Delta Logo
5:40 am - 8:52 amHLN  Helena-ONT Ontario
4h 12m1 stop Salt Lake City
Delta Logo
5:05 pm - 10:30 pmONT  Ontario-HLN Helena
4h 25m1 stop Salt Lake City
$379Delta
Thu, Aug 27 - Mon, Aug 31
Delta Logo
7:15 am - 12:14 pmHLN  Helena-ONT Ontario
5h 59m1 stop Salt Lake City
Delta Logo
6:00 am - 12:28 pmONT  Ontario-HLN Helena
5h 28m1 stop Salt Lake City
$394Delta
Tue, Sep 29 - Tue, Oct 6
Delta Logo
12:57 pm - 10:40 pmHLN  Helena-ONT Ontario
10h 43m2 stops Salt Lake City Seattle/Tacoma Intl
Delta Logo
6:00 am - 12:28 pmONT  Ontario-HLN Helena
5h 28m1 stop Salt Lake City
$399Delta
Thu, Oct 1 - Tue, Oct 6
Delta Logo
7:15 am - 12:14 pmHLN  Helena-ONT Ontario
5h 59m1 stop Salt Lake City
Delta Logo
11:54 am - 12:28 pmONT  Ontario-HLN Helena
23h 34m2 stops Seattle/Tacoma Intl Salt Lake City
$406Delta
Wed, Sep 30 - Mon, Oct 5
United Airlines Logo
2:23 pm - 8:51 pmHLN  Helena-ONT Ontario
7h 28m1 stop Denver Intl
United Airlines Logo
1:29 pm - 9:31 pmONT  Ontario-HLN Helena
7h 02m1 stop Denver Intl
$409United Airlines
Sat, Oct 31 - Tue, Nov 10

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United Airlines flights from Helena to Ontario

Our best United Airlines deals on Helena to Ontario flight tickets
United Airlines
Nov 5
HLN2:23 pmHelena
7h 28m
1 stop
ONT8:51 pmOntario
Nov 8
ONT5:00 amOntario
7h 40m
1 stop
HLN1:40 pmHelena
$329
United Airlines
Oct 31
HLN2:23 pmHelena
7h 28m
1 stop
ONT8:51 pmOntario
Nov 10
ONT1:29 pmOntario
7h 02m
1 stop
HLN9:31 pmHelena
$409
United Airlines
Oct 23
HLN2:30 pmHelena
7h 28m
1 stop
ONT8:58 pmOntario
Oct 24
ONT1:22 pmOntario
6h 56m
1 stop
HLN9:18 pmHelena
$439

Delta flights from Helena to Ontario

Our best Delta deals on Helena to Ontario flight tickets
Delta
Nov 5
HLN1:08 pmHelena
10h 35m
2 stops
ONT10:43 pmOntario
Nov 9
ONT5:11 pmOntario
4h 15m
1 stop
HLN10:26 pmHelena
$334
Delta
Nov 5
HLN1:08 pmHelena
10h 35m
2 stops
ONT10:43 pmOntario
Nov 9
ONT5:11 pmOntario
4h 15m
1 stop
HLN10:26 pmHelena
$356
Delta
Nov 5
HLN7:15 amHelena
6h 06m
1 stop
ONT12:21 pmOntario
Nov 9
ONT6:00 amOntario
5h 22m
1 stop
HLN12:22 pmHelena
$364

momondo Fare Finder

 
Customize your flight search to find flights from Helena to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated August 14, 2026.
Use the filters below to find and compare flights from Helena to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

HelenaOntario

HLN Helena - ONT Ontario

HLNONT

Helena

Thu 11/5

7:15 am-12:21 pm

1 stop6h 06m

Ontario

Mon 11/9

6:00 am-12:22 pm

1 stop5h 22m

$329

HelenaOntario

HLN Helena - ONT Ontario

HLNONT

Helena

Thu 11/5

1:08 pm-10:43 pm

2 stops10h 35m

Ontario

Mon 11/9

5:11 pm-10:26 pm

1 stop4h 15m

$334

HelenaOntario

HLN Helena - ONT Ontario

HLNONT

Helena

Thu 11/5

1:08 pm-10:43 pm

2 stops10h 35m

Ontario

Mon 11/9

5:11 pm-10:26 pm

1 stop4h 15m

$356

HelenaOntario

HLN Helena - ONT Ontario

HLNONT

Helena

Thu 11/5

7:15 am-12:21 pm

1 stop6h 06m

Ontario

Mon 11/9

6:00 am-12:22 pm

1 stop5h 22m

$364

HelenaOntario

HLN Helena - ONT Ontario

HLNONT

Helena

Thu 11/5

1:08 pm-10:43 pm

2 stops10h 35m

Ontario

Mon 11/9

5:11 pm-10:26 pm

1 stop4h 15m

$369
Quickest round-trip

HelenaOntario

HLN Helena - ONT Ontario

HLNONT

Helena

Thu 8/27

5:40 am-8:52 am

1 stop4h 12m

Ontario

Mon 8/31

5:05 pm-10:30 pm

1 stop4h 25m

$379

HelenaOntario

HLN Helena - ONT Ontario

HLNONT

Helena

Tue 9/29

7:15 am-12:14 pm

1 stop5h 59m

Ontario

Tue 10/6

6:00 am-12:28 pm

1 stop5h 28m

$394

HelenaOntario

HLN Helena - ONT Ontario

HLNONT

Helena

Thu 10/1

12:57 pm-10:40 pm

2 stops10h 43m

Ontario

Tue 10/6

6:00 am-12:28 pm

1 stop5h 28m

$399

HelenaOntario

HLN Helena - ONT Ontario

HLNONT

Helena

Wed 9/30

7:15 am-12:14 pm

1 stop5h 59m

Ontario

Mon 10/5

11:54 am-12:28 pm

2 stops23h 34m

$406

HelenaOntario

HLN Helena - ONT Ontario

HLNONT

Helena

Sat 10/31

2:23 pm-8:51 pm

1 stop7h 28m

Ontario

Tue 11/10

1:29 pm-9:31 pm

1 stop7h 02m

$409

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Helena to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Helena to Ontario?

Alaska Airlines and Delta are the most popular carriers operating from Helena to Ontario

What airlines fly to Ontario?

United Airlines, Delta and Alaska Airlines are the top three most popular airlines that fly to Ontario from Helena according to our data. United Airlines is the first choice among our users, with 41% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 6 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

When to book flights from Helena to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Helena to Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Helena to Ontario (HLN to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Helena to Ontario

Fastest flight time

4h 26m

Direct flights

None
The fastest flight from Helena to Ontario takes 4h 26m
There are no direct flights from Helena to Ontario. There are no popular flight routes from Helena to Ontario.
Search flight deals

Frequently asked questions about flying from Helena to Ontario

  • How far is Helena to Ontario by plane?

    The straight-line distance from Helena to Ontario is 913.6 mi. Flights usually cover this in 4h 26m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Helena Airport to Ontario Airport?

    Prices for flights from Helena Airport to Ontario Airport were last updated today.

  • How old do you have to be to fly from Helena Airport to Ontario Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Helena Airport to Ontario Airport.

  • What documentation or ID do you need to fly to Ontario Airport?

    The required travel and health documents for your Ontario Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Why use momondo?

Why should I use momondo to find a flight deal from Helena to Ontario?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Helena to Ontario for you.

Can I find flights from Helena to Ontario with flexible booking policies on momondo?

All flight searches from Helena to Ontario on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Helena to Ontario?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Helena to Ontario.

I’m not ready to book a flight from Helena to Ontario right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Helena to Ontario flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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