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Riverside

$46+ 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 8/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Aug 23 — Aug 301
Sun 8/23
Sun 8/30
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 July 24, 2026.

This Kiwi.com deal was found by Cheapflights users on 7/19. 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 9/57:56 pm
ONT
-
LAX
1 stop12h 34m
Frontier
Sun 9/66:02 pm
LAX
-
ONT
1 stop17h 00m
Frontier
Deal found 7/19$141
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 8/226:00 am
ONT
-
LAX
1 stop18h 11m
Frontier
Sat 8/296:30 am
LAX
-
ONT
1 stop17h 20m
Frontier
Deal found 7/23$155
This Kiwi.com deal was found by Cheapflights users on 7/19. 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 8/138:58 am
ONT
-
LAX
1 stop12h 50m
Frontier
Wed 9/236:37 pm
LAX
-
ONT
1 stop19h 23m
Frontier
Deal found 7/19$162
This Kiwi.com deal was found by Cheapflights users on 7/19. 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 8/138:58 am
ONT
-
LAX
1 stop12h 50m
Frontier
Thu 9/249:15 am
LAX
-
ONT
1 stop11h 02m
Frontier
Deal found 7/19$181
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 8/193:13 pm
ONT
-
LAX
1 stop6h 41m
Frontier
Wed 8/267:07 pm
LAX
-
ONT
1 stop15h 22m
Frontier
Deal found 7/20$188
This Kiwi.com deal was found by Cheapflights users on 7/20. 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 8/183:13 pm
ONT
-
LAX
1 stop6h 41m
Frontier
Tue 8/257:07 pm
LAX
-
ONT
1 stop18h 56m
Frontier
Deal found 7/20$190
This Kiwi.com deal was found by Cheapflights users on 7/19. 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 8/138:58 am
ONT
-
LAX
1 stop12h 50m
Frontier
Tue 9/2210:07 am
LAX
-
ONT
1 stop27h 56m
Frontier
Deal found 7/19$197
This Kiwi.com deal was found by Cheapflights users on 7/19. 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 8/138:58 am
ONT
-
LAX
1 stop12h 50m
Frontier
Sun 9/206:37 pm
LAX
-
ONT
1 stop19h 23m
Frontier
Deal found 7/19$206
This Kiwi.com deal was found by Cheapflights users on 7/19. 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 8/138:58 am
ONT
-
LAX
1 stop12h 50m
Frontier
Mon 9/2111:47 am
LAX
-
ONT
1 stop4h 23m
Frontier
Deal found 7/19$220
This Kiwi.com deal was found by Cheapflights users on 7/19. 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 8/138:58 am
ONT
-
LAX
1 stop12h 50m
Frontier
Fri 9/183:15 pm
LAX
-
ONT
1 stop5h 39m
Frontier
Deal found 7/19$232

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 July 24, 2026.

Round-trip from

$141
(Kiwi.com)

One-way from

$46
(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 July 24, 2026.
Use the filters below to find and compare flights from Ontario to Riverside that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Sat 9/5

7:56 pm-8:30 am

1 stop12h 34m

Los Angeles

Sun 9/6

6:02 pm-11:02 am

1 stop17h 00m

$141

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Sat 8/22

6:00 am-12:11 am

1 stop18h 11m

Los Angeles

Sat 8/29

6:30 am-11:50 pm

1 stop17h 20m

$155

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Thu 8/13

8:58 am-9:48 pm

1 stop12h 50m

Los Angeles

Wed 9/23

6:37 pm-2:00 pm

1 stop19h 23m

$162

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Tue 8/18

3:13 pm-9:54 pm

1 stop6h 41m

Los Angeles

Tue 8/25

7:07 pm-2:03 pm

1 stop18h 56m

$190

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Thu 8/13

8:58 am-9:48 pm

1 stop12h 50m

Los Angeles

Tue 9/22

10:07 am-2:03 pm

1 stop27h 56m

$197

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Fri 8/14

4:09 pm-9:30 am

1 stop17h 21m

Los Angeles

Fri 8/21

7:07 pm-11:02 am

1 stop15h 55m

$260

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Fri 8/21

3:40 pm-9:29 am

1 stop17h 49m

Los Angeles

Fri 8/28

7:07 pm-11:02 am

1 stop15h 55m

$267

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Sat 8/8

11:47 am-9:30 am

1 stop21h 43m

Los Angeles

Wed 8/12

10:00 am-11:50 pm

1 stop13h 50m

$276
Quickest round-trip

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Fri 11/6

11:19 am-3:52 pm

1 stop4h 33m

Los Angeles

Sun 11/8

7:43 pm-1:40 pm

1 stop17h 57m

$287
Cheapest one-way

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Wed 8/19

3:13 pm-9:54 pm

1 stop6h 41m

$46

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/22

Showing 1-10 of 16 resultsSorted by cheapest first
1
2

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

No data available for this route at this time. Please check back soon.

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 12h 34m. Frontier provides one of the quickest options available for as low as $141. 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.

See more FAQs

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