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Riverside

$79+ 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 1/17. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap 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 December 18, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/17. 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 12/316:00 amONT - LAX
1 stop14h 31mMultiple Airlines
Fri 1/169:17 amLAX - ONT
1 stop8h 27mMultiple Airlines
Deal found 12/17$161
This Kiwi.com deal was found by Cheapflights users on 12/17. 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.
Tue 12/306:00 amONT - LAX
1 stop25h 18mMultiple Airlines
Fri 1/29:20 pmLAX - ONT
1 stop26h 01mMultiple Airlines
Deal found 12/17$190
This Kiwi.com deal was found by Cheapflights users on 12/16. 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.
Wed 12/246:00 pmONT - LAX
1 stop23h 04mMultiple Airlines
Tue 12/309:20 pmLAX - ONT
1 stop19h 55mMultiple Airlines
Deal found 12/16$208
This Kiwi.com deal was found by Cheapflights users on 12/17. 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.
Mon 12/226:00 amONT - LAX
1 stop14h 31mMultiple Airlines
Mon 1/55:59 pmLAX - ONT
1 stop21h 10mMultiple Airlines
Deal found 12/17$254
This Kiwi.com deal was found by Cheapflights users on 12/17. 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 12/206:00 amONT - LAX
1 stop14h 31mMultiple Airlines
Mon 1/59:20 pmLAX - ONT
1 stop17h 49mMultiple Airlines
Deal found 12/17$287
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 12/206:00 amONT - LAX
1 stop14h 31mMultiple Airlines
Sat 12/279:20 pmLAX - ONT
1 stop24h 07mMultiple Airlines
Deal found 12/16$325
This Kiwi.com deal was found by Cheapflights users on 12/17. 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.
Mon 12/226:00 amONT - LAX
1 stop14h 31mFrontier
Mon 1/511:59 pmLAX - ONT
2 stops22h 13mFrontier
Deal found 12/17$367
This Kiwi.com deal was found by Cheapflights users on 12/16. 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.
Thu 12/186:17 pmONT - LAX
1 stop26h 14mFrontier
Sat 12/203:30 pmLAX - ONT
1 stop7h 43mFrontier
Deal found 12/16$457

Find flight deals from Ontario to Riverside

Keep the following information in mind while searching for Ontario to Riverside flight deals. Data was last updated December 18, 2025.

Round-trip from

$125
(Kiwi.com)

One-way from

$79
(Kiwi.com)
From Ontario to Riverside
Search Deals
One-way flight from Ontario to Riverside
Search Deals

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 December 18, 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

Sat 1/24

7:15 am-1:44 pm

1 stop6h 29m

Los Angeles

Mon 1/26

9:17 am-2:41 pm

1 stop5h 24m

$125

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Tue 1/13

6:49 pm-8:22 am

1 stop13h 33m

Los Angeles

Tue 1/20

9:17 am-1:37 pm

1 stop4h 20m

$128

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Sat 1/24

7:15 am-11:31 pm

1 stop16h 16m

Los Angeles

Mon 1/26

1:13 pm-1:37 pm

1 stop24h 24m

$130

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Wed 1/14

6:49 pm-8:20 am

1 stop13h 31m

Los Angeles

Wed 1/21

9:17 am-2:12 pm

1 stop4h 55m

$133

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Sat 1/17

9:10 pm-8:20 am

1 stop11h 10m

Los Angeles

Sat 1/24

2:39 pm-11:24 pm

1 stop8h 45m

$142

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Wed 12/31

6:00 am-8:31 pm

1 stop14h 31m

Los Angeles

Fri 1/16

9:17 am-5:44 pm

1 stop8h 27m

$161

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Fri 1/16

6:10 am-12:29 am

1 stop18h 19m

Los Angeles

Fri 1/23

2:04 pm-7:53 pm

1 stop5h 49m

$163

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Sat 1/17

9:10 pm-8:20 am

1 stop11h 10m

$79

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Tue 12/23

6:17 pm-7:18 am

1 stop13h 01m

$152

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Tue 12/23

6:17 pm-1:22 pm

2 stops19h 05m

$204

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

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 $100). Flying from Ontario to Riverside in August is currently the most expensive (average of $444). 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 16h 16m. Frontier provides one of the quickest options available for as low as $130. 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 $100). Flying from Ontario to Riverside in August is currently the most expensive (average of $444). 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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