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Riverside

$63+ 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 2/23. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Mar 15 — Mar 221
Sun 3/15
Sun 3/22
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 February 13, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/12. 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 4/157:29 pm
ONT
-
LAX
1 stop12h 41m
Multiple Airlines
Wed 4/229:12 am
LAX
-
ONT
1 stop4h 28m
Multiple Airlines
Deal found 2/12$128
This Kiwi.com deal was found by Cheapflights users on 2/11. 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 3/1110:03 pm
ONT
-
LAX
1 stop10h 17m
Multiple Airlines
Wed 3/184:07 pm
LAX
-
ONT
1 stop4h 56m
Multiple Airlines
Deal found 2/11$129
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Tue 2/243:22 pm
ONT
-
LAX
1 stop16h 53m
Multiple Airlines
Wed 2/254:07 pm
LAX
-
ONT
1 stop21h 04m
Multiple Airlines
Deal found 2/10$136
This Kiwi.com deal was found by Cheapflights users on 2/12. 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 4/210:27 pm
ONT
-
LAX
1 stop8h 54m
Frontier
Wed 4/81:39 pm
LAX
-
ONT
1 stop7h 21m
Frontier
Deal found 2/12$139
This Kiwi.com deal was found by Cheapflights users on 2/9. 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.
Tue 3/172:23 pm
ONT
-
LAX
1 stop22h 16m
Frontier
Tue 4/79:05 pm
LAX
-
ONT
2 stops26h 51m
Frontier
Deal found 2/9$141
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Sat 2/282:06 pm
ONT
-
LAX
1 stop18h 09m
Multiple Airlines
Sat 3/71:19 pm
LAX
-
ONT
1 stop4h 56m
Multiple Airlines
Deal found 2/10$152
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 4/3012:59 am
ONT
-
LAX
1 stop7h 41m
Frontier
Mon 5/119:28 pm
LAX
-
ONT
1 stop16h 12m
Frontier
Deal found 2/9$161
This Kiwi.com deal was found by Cheapflights users on 2/10. 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 3/233:30 pm
ONT
-
LAX
1 stop21h 09m
Multiple Airlines
Fri 3/274:07 pm
LAX
-
ONT
1 stop21h 21m
Multiple Airlines
Deal found 2/10$169
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Fri 3/279:49 pm
ONT
-
LAX
1 stop14h 35m
Frontier
Mon 3/309:28 pm
LAX
-
ONT
1 stop16h 00m
Frontier
Deal found 2/10$174
This Kiwi.com deal was found by Cheapflights users on 2/11. 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 3/1110:03 pm
ONT
-
LAX
1 stop10h 17m
Frontier
Wed 3/188:15 pm
LAX
-
ONT
2 stops35h 51m
Frontier
Deal found 2/11$182
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Sat 2/282:06 pm
ONT
-
LAX
1 stop17h 20m
Frontier
Sat 3/78:01 pm
LAX
-
ONT
2 stops35h 05m
Frontier
Deal found 2/10$183

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 February 13, 2026.

Round-trip from

$128
(Kiwi.com)

One-way from

$63
(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 February 13, 2026.
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

Sun 3/15

1:55 pm-9:06 am

1 stop19h 11m

Los Angeles

Tue 3/17

6:30 pm-1:28 pm

1 stop18h 58m

$129

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Wed 3/11

10:03 pm-8:20 am

1 stop10h 17m

Los Angeles

Wed 3/18

4:07 pm-9:03 pm

1 stop4h 56m

$129

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Wed 3/11

6:15 am-12:16 am

1 stop18h 01m

Los Angeles

Wed 3/18

1:39 pm-9:03 pm

1 stop7h 24m

$130

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Tue 3/17

2:23 pm-9:06 am

1 stop18h 43m

Los Angeles

Tue 4/7

8:58 pm-11:56 pm

1 stop26h 58m

$130

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Tue 3/10

2:23 pm-8:15 am

1 stop17h 52m

Los Angeles

Tue 3/17

1:39 pm-1:28 pm

1 stop23h 49m

$130

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Mon 3/9

9:40 pm-12:39 pm

1 stop14h 59m

Los Angeles

Mon 3/16

8:19 pm-1:28 pm

1 stop17h 09m

$131

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Thu 4/16

11:44 am-5:11 pm

1 stop5h 27m

Los Angeles

Mon 4/20

9:28 pm-1:40 pm

1 stop16h 12m

$131

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Tue 3/31

2:23 pm-9:06 am

1 stop18h 43m

Los Angeles

Fri 4/3

10:53 pm-11:39 am

1 stop12h 46m

$131

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Tue 2/24

3:22 pm-8:15 am

1 stop16h 53m

Los Angeles

Wed 2/25

4:07 pm-1:11 pm

1 stop21h 04m

$136

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Tue 3/17

2:23 pm-12:39 pm

1 stop22h 16m

Los Angeles

Tue 4/7

9:05 pm-11:56 pm

2 stops26h 51m

$141

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/10

Showing 1-10 of 22 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 $100). 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.

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.

  • 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 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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