What is the cheapest airline to fly from Los Angeles to Ontario round-trip?

According to our current data, Alaska Airlines ($418), offers the cheapest pricing from Los Angeles to Ontario.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

What is the cheapest time of day to fly from LAX to ONT?

When flying from Los Angeles to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Can I find deals for flights from Los Angeles to Ontario that include hotel bookings?

Yes. In addition to deals on Los Angeles to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Los Angeles to Ontario?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Los Angeles to Ontario.

Can I find deals for business class flights from Los Angeles to Ontario?

Yes. Cheapflights offers flight deals from Los Angeles to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$188+ Flights from Los Angeles to Ontario

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Cheap flight deals from Los Angeles to Ontario

Round-trip from	$418 (Netflights)
One-way from	$188 (Netflights)

From Los Angeles to Ontario

Search Deals

One-way flight from Los Angeles to Ontario

Search Deals

Find flight deals from Los Angeles to Ontario

Cheapest flights from Los Angeles to Ontario
Explore the most affordable flight options available from Los Angeles to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.

Mon 9/153:40 pmLAX - ONT

1 stop8h 23mAlaska Airlines

Fri 11/144:11 pmONT - LAX

1 stop6h 35mAlaska Airlines

Deal found 7/30

$418

Best flights from Los Angeles to Ontario
Discover carefully curated flight deals from Los Angeles to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 31, 2025.

Wed 9/107:00 amLAX - ONT

1 stop7h 12mHawaiian Airlines

Sat 9/137:10 amONT - LAX

1 stop5h 54mHawaiian Airlines

Deal found 7/29

$293

Mon 9/155:36 pmLAX - ONT

1 stop6h 27mAlaska Airlines

Fri 11/147:20 amONT - LAX

1 stop5h 37mAlaska Airlines

Deal found 7/29

$399

One-way flights from Los Angeles to Ontario
Search for one-way flight options from Los Angeles to Ontario. Find affordable one-way fares based on user searches. Data last updated July 31, 2025.

Sat 10/45:15 pmLAX - ONT

1 stop6h 48mAlaska Airlines

Deal found 7/30

$188

Sat 10/47:00 amLAX - ONT

2 stops9h 53mMultiple Airlines

Deal found 7/30

$352

Fly from

Fly to

Route

Depart

Return

Price

Los AngelesOntario

LAX - ONT

LAXONT

Los Angeles

Wed 9/10

7:00 am-2:12 pm

1 stop7h 12m

Ontario

Sat 9/13

7:10 am-1:04 pm

1 stop5h 54m

$293

Los AngelesOntario

LAX - ONT

LAXONT

Los Angeles

Mon 9/15

5:36 pm-12:03 am

1 stop6h 27m

Ontario

Fri 11/14

7:20 am-12:57 pm

1 stop5h 37m

$399

Los AngelesOntario

LAX - ONT

LAXONT

Los Angeles

Sat 10/4

5:15 pm-12:03 am

1 stop6h 48m

$188

Los AngelesOntario

LAX - ONT

LAXONT

Los Angeles

Sat 10/4

7:00 am-4:53 pm

2 stops9h 53m

$352

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Best time to book a flight from Los Angeles to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Los Angeles with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Los Angeles to Ontario

What is the cheapest month to book a flight from Los Angeles to Ontario?

Currently, August is the cheapest month in which you can book a flight from Los Angeles to Ontario (average of $246). Flying from Los Angeles to Ontario in March is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Ontario

Get a feel of what it's like to fly with Alaska Airlines from Los Angeles to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Alaska Airlines

8.0

Very good

10,000 reviews

Alaska Airlines

8.0

Very good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

What is the cheapest airline to fly from Los Angeles to Ontario round-trip?
According to our current data, Alaska Airlines ($418), offers the cheapest pricing from Los Angeles to Ontario.
Can I find deals for flights from Los Angeles to Ontario that include hotel bookings?
Yes. In addition to deals on Los Angeles to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Los Angeles to Ontario?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Los Angeles to Ontario.
Can I find deals for business class flights from Los Angeles to Ontario?
Yes. Cheapflights offers flight deals from Los Angeles to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Los Angeles to Ontario?
Currently, August is the cheapest month in which you can book a flight from Los Angeles to Ontario (average of $246). Flying from Los Angeles to Ontario in March is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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$188+ Cheap flights from Los Angeles to Ontario (LAX - ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/4. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Los Angeles to Ontario with Cheapflights

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2. Select your favorite providers

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Cheap flight deals from Los Angeles to Ontario

Round-trip from

One-way from

Find flight deals from Los Angeles to Ontario

Cheapest flights from Los Angeles to OntarioExplore the most affordable flight options available from Los Angeles to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.

Explore the most affordable flight options available from Los Angeles to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Los Angeles to Ontario that are best for you.

Best time to book a flight from Los Angeles to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Los Angeles with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Los Angeles to Ontario

What is the cheapest month to book a flight from Los Angeles to Ontario?

Reviews of airlines servicing Ontario

Get a feel of what it's like to fly with Alaska Airlines from Los Angeles to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Los Angeles to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What is the cheapest airline to fly from Los Angeles to Ontario round-trip?

Can I find deals for flights from Los Angeles to Ontario that include hotel bookings?

How can I find direct flights from Los Angeles to Ontario?

Can I find deals for business class flights from Los Angeles to Ontario?

What is the cheapest month to book a flight from Los Angeles to Ontario?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Los Angeles to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

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Travel Smart

Cheapest flights from Los Angeles to Ontario
Explore the most affordable flight options available from Los Angeles to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.