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Riverside

$71+ 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 10/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
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 September 17, 2025.

Round-trip from

$147
(Kiwi.com)

One-way from

$71
(Kiwi.com)
From Ontario to Riverside
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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 September 17, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/17. 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.
Fri 11/1410:40 pmONT - LAX
1 stop20h 19mFrontier
Mon 11/176:29 pmLAX - ONT
1 stop5h 21mFrontier
Deal found 9/17$147
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Tue 9/238:00 amONT - LAX
1 stop5h 33mMultiple Airlines
Sat 10/49:36 amLAX - ONT
1 stop12h 20mMultiple Airlines
Deal found 9/15$155
This Kiwi.com deal was found by Cheapflights users on 9/17. 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 10/158:00 amONT - LAX
1 stop11h 53mFrontier
Wed 10/223:48 pmLAX - ONT
1 stop4h 54mFrontier
Deal found 9/17$171
This Kiwi.com deal was found by Cheapflights users on 9/17. 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.
Fri 10/1710:50 pmONT - LAX
1 stop14h 42mFrontier
Fri 10/246:47 pmLAX - ONT
1 stop5h 25mFrontier
Deal found 9/17$179
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 10/1310:47 pmONT - LAX
1 stop21h 06mFrontier
Mon 10/209:17 pmLAX - ONT
1 stop26h 33mFrontier
Deal found 9/14$180
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Fri 10/1710:50 pmONT - LAX
1 stop14h 42mFrontier
Sun 10/198:40 pmLAX - ONT
1 stop11h 07mFrontier
Deal found 9/16$184
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/118:00 amONT - LAX
1 stop11h 53mFrontier
Tue 10/143:48 pmLAX - ONT
1 stop4h 54mFrontier
Deal found 9/16$185
This Kiwi.com deal was found by Cheapflights users on 9/17. 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 10/111:37 pmONT - LAX
1 stop6h 16mFrontier
Mon 10/139:17 pmLAX - ONT
1 stop26h 33mFrontier
Deal found 9/17$188
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 9/287:30 pmONT - LAX
1 stop16h 16mMultiple Airlines
Sun 10/57:35 pmLAX - ONT
1 stop11h 42mMultiple Airlines
Deal found 9/15$194
This Kiwi.com deal was found by Cheapflights users on 9/17. 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 10/236:05 amONT - LAX
1 stop6h 09mFrontier
Mon 10/272:20 pmLAX - ONT
2 stops9h 52mFrontier
Deal found 9/17$201

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 September 17, 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

Fri 11/14

10:40 pm-6:59 pm

1 stop20h 19m

Los Angeles

Mon 11/17

6:29 pm-11:50 pm

1 stop5h 21m

$147

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Tue 9/23

8:00 am-1:33 pm

1 stop5h 33m

Los Angeles

Sat 10/4

9:36 am-9:56 pm

1 stop12h 20m

$155

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Thu 10/23

6:54 pm-8:38 am

1 stop13h 44m

Los Angeles

Mon 10/27

6:57 pm-12:12 am

1 stop5h 15m

$155

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Wed 10/15

8:00 am-7:53 pm

1 stop11h 53m

Los Angeles

Wed 10/22

3:48 pm-8:42 pm

1 stop4h 54m

$171

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Fri 10/17

10:50 pm-1:32 pm

1 stop14h 42m

Los Angeles

Fri 10/24

6:47 pm-12:12 am

1 stop5h 25m

$179

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Tue 11/18

8:00 am-7:53 pm

1 stop11h 53m

Los Angeles

Wed 11/19

3:27 pm-8:42 pm

1 stop5h 15m

$180

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Sat 10/11

1:37 pm-7:53 pm

1 stop6h 16m

Los Angeles

Mon 10/13

9:17 pm-11:50 pm

1 stop26h 33m

$188

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Sun 9/28

7:30 pm-11:46 am

1 stop16h 16m

Los Angeles

Sun 10/5

7:35 pm-7:17 am

1 stop11h 42m

$194

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Fri 10/17

10:50 pm-1:32 pm

1 stop14h 42m

Los Angeles

Thu 10/23

12:09 am-4:28 pm

1 stop16h 19m

$204

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Mon 10/27

10:50 pm-8:00 pm

1 stop21h 10m

$71

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/17

Showing 1-10 of 18 results
1
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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, January is the cheapest month in which you can book a flight from Ontario to Riverside (average of $246). Flying from Ontario to Riverside in March is currently the most expensive (average of $325). 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.

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 20h 19m. Frontier provides one of the quickest options available for as low as $147. 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, January is the cheapest month in which you can book a flight from Ontario to Riverside (average of $246). Flying from Ontario to Riverside in March is currently the most expensive (average of $325). 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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