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Riverside

$67+ Cheap flights from Ontario (ONT) to Riverside, CA

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 1/10. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Dec 10 — Dec 171
Wed 12/10
Wed 12/17
1 adult, Economy
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Cheap flight deals from Ontario to Riverside

Keep the following information in mind while searching for Ontario to Riverside flight deals. Data was last updated November 10, 2025.

Round-trip from

$129
(Kiwi.com)

One-way from

$67
(Kiwi.com)
From Ontario to Riverside
Search Deals
One-way flight from Ontario to Riverside
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Find flight deals from Ontario to Riverside

Cheapest flights from Ontario to Riverside
Explore the most affordable flight options available from Ontario to Riverside. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 10, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/106:15 amONT - LAX
1 stop13h 50mFrontier
Wed 12/173:30 pmLAX - ONT
1 stop5h 47mFrontier
Deal found 11/10$127
This Kiwi.com deal was found by Cheapflights users on 11/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/82:59 pmONT - LAX
1 stop31h 25mMultiple Airlines
Mon 12/156:21 pmLAX - ONT
1 stop5h 10mMultiple Airlines
Deal found 11/10$128
This Kiwi.com deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/82:59 pmONT - LAX
1 stop30h 12mFrontier
Tue 12/163:30 pmLAX - ONT
1 stop5h 47mFrontier
Deal found 11/8$129
This Kiwi.com deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/66:15 amONT - LAX
1 stop13h 50mFrontier
Sat 12/133:30 pmLAX - ONT
1 stop5h 47mFrontier
Deal found 11/8$131
This Kiwi.com deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/42:59 pmONT - LAX
1 stop5h 06mFrontier
Sun 12/71:42 pmLAX - ONT
1 stop26h 51mFrontier
Deal found 11/9$132
This Kiwi.com deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/15:06 pmONT - LAX
1 stop14h 49mMultiple Airlines
Tue 12/29:54 pmLAX - ONT
1 stop23h 23mMultiple Airlines
Deal found 11/9$139
This Kiwi.com deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/266:30 amONT - LAX
1 stop14h 29mMultiple Airlines
Sun 11/303:18 pmLAX - ONT
1 stop23h 08mMultiple Airlines
Deal found 11/8$152
This Kiwi.com deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/273:31 pmONT - LAX
1 stop4h 16mFrontier
Sun 11/305:33 pmLAX - ONT
1 stop20h 53mFrontier
Deal found 11/9$157
This Kiwi.com deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/235:06 pmONT - LAX
1 stop19h 47mFrontier
Sun 11/305:33 pmLAX - ONT
1 stop20h 53mFrontier
Deal found 11/9$158
This Kiwi.com deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/66:15 amONT - LAX
1 stop13h 50mMultiple Airlines
Sat 12/1310:10 pmLAX - ONT
2 stops18h 23mMultiple Airlines
Deal found 11/8$159

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Riverside 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, Cheapflights users made 2,558,603 searches. Data last updated November 10, 2025.
Use the filters below to find and compare flights from Ontario to Riverside that are best for you.

Fly from

Ontario

Fly to

Riverside

Route

Depart

Return

Price

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Mon 12/8

2:59 pm-9:11 pm

1 stop30h 12m

Los Angeles

Tue 12/16

3:30 pm-9:17 pm

1 stop5h 47m

$129

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Sat 12/6

6:15 am-8:05 pm

1 stop13h 50m

Los Angeles

Sat 12/13

3:30 pm-9:17 pm

1 stop5h 47m

$131

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Thu 12/4

2:59 pm-8:05 pm

1 stop5h 06m

Los Angeles

Sun 12/7

1:42 pm-4:33 pm

1 stop26h 51m

$132

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Mon 12/1

5:06 pm-7:55 am

1 stop14h 49m

Los Angeles

Tue 12/2

9:54 pm-9:17 pm

1 stop23h 23m

$139

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Sun 12/7

2:59 pm-9:30 am

1 stop18h 31m

Los Angeles

Sun 12/14

10:24 pm-9:17 pm

1 stop22h 53m

$139

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Wed 11/26

6:30 am-8:59 pm

1 stop14h 29m

Los Angeles

Sun 11/30

3:18 pm-2:26 pm

1 stop23h 08m

$152

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Thu 11/27

3:31 pm-7:47 pm

1 stop4h 16m

Los Angeles

Sun 11/30

5:33 pm-2:26 pm

1 stop20h 53m

$157

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Sun 11/23

5:06 pm-12:53 pm

1 stop19h 47m

Los Angeles

Sun 11/30

5:33 pm-2:26 pm

1 stop20h 53m

$158

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Sat 12/6

6:15 am-8:05 pm

1 stop13h 50m

Los Angeles

Sat 12/13

10:10 pm-4:33 pm

2 stops18h 23m

$159

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Fri 11/21

6:25 am-8:59 pm

1 stop14h 34m

Los Angeles

Sat 11/29

7:42 am-9:06 pm

1 stop13h 24m

$167

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/9

Showing 1-10 of 18 results
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Best time to book a flight from Ontario to Riverside

Have a flexible travel schedule? Discover the best time to fly to Riverside from Ontario 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 Ontario to Riverside

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

Currently, March is the cheapest month in which you can book a flight from Ontario to Riverside (average of $102). Flying from Ontario to Riverside in July is currently the most expensive (average of $282). 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.

What is the cheapest time of day to fly from ONT to R1V?

Find hourly flight availability from Ontario to Riverside. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 10, 2025.

It’s optimal to fly from Ontario to Riverside in the evening. By choosing this option you can save up to 84% on the cost of your flight, compared to a flight at noon.

Related info for your journey

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

  • What airport do you fly from for flights from Ontario to Riverside?

    If you book a flight to Riverside from Ontario, you will be flying from Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario. There are 0 flights from Ontario to Riverside per day from 0 different airlines.

  • How long is the flight from Ontario to Riverside?

    A quick flight from Ontario to Riverside can take about 30h 12m. Frontier provides one of the quickest options available for as low as $129. Ontario and Riverside are separated by a distance of 47 mi.

  • Can I find deals for flights from Ontario to Riverside that include hotel bookings?

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

  • How can I find direct flights from Ontario to Riverside?

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

  • Can I find deals for business class flights from Ontario to Riverside?

    Yes. Cheapflights offers flight deals from Ontario to Riverside 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 Ontario to Riverside?

    Currently, March is the cheapest month in which you can book a flight from Ontario to Riverside (average of $102). Flying from Ontario to Riverside in July is currently the most expensive (average of $282). 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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