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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 2/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Mar 5 — Mar 121
Thu 3/5
Thu 3/12
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 3, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/23:28 pm
ONT
-
LAX
1 stop16h 47m
Multiple Airlines
Mon 3/99:23 pm
LAX
-
ONT
1 stop16h 05m
Multiple Airlines
Deal found 2/2$124
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 2/257:17 pm
ONT
-
LAX
1 stop12h 04m
Multiple Airlines
Wed 3/49:12 am
LAX
-
ONT
1 stop3h 59m
Multiple Airlines
Deal found 2/1$129
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 2/166:43 pm
ONT
-
LAX
1 stop13h 32m
Multiple Airlines
Thu 2/199:12 am
LAX
-
ONT
1 stop3h 59m
Multiple Airlines
Deal found 2/2$131
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 2/117:17 pm
ONT
-
LAX
1 stop12h 58m
Multiple Airlines
Mon 2/164:07 pm
LAX
-
ONT
1 stop21h 04m
Multiple Airlines
Deal found 2/2$137
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/52:08 pm
ONT
-
LAX
1 stop10h 22m
Frontier
Sat 3/76:15 am
LAX
-
ONT
1 stop17h 44m
Frontier
Deal found 2/2$141
This Kiwi.com deal was found by Cheapflights users on 2/3. 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 2/279:43 pm
ONT
-
LAX
1 stop10h 32m
Multiple Airlines
Fri 3/69:12 am
LAX
-
ONT
1 stop6h 25m
Multiple Airlines
Deal found 2/3$143
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 3/26:43 pm
ONT
-
LAX
1 stop13h 32m
Multiple Airlines
Wed 3/256:30 pm
LAX
-
ONT
1 stop12h 42m
Multiple Airlines
Deal found 2/1$145
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 3/47:17 pm
ONT
-
LAX
1 stop12h 04m
Frontier
Tue 3/246:30 pm
LAX
-
ONT
1 stop18h 58m
Frontier
Deal found 2/1$149
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 3/110:14 pm
ONT
-
LAX
1 stop10h 01m
Multiple Airlines
Mon 3/238:19 pm
LAX
-
ONT
1 stop17h 09m
Multiple Airlines
Deal found 2/1$151
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 3/110:14 pm
ONT
-
LAX
1 stop10h 01m
Multiple Airlines
Sun 3/86:15 am
LAX
-
ONT
1 stop17h 44m
Multiple Airlines
Deal found 2/1$154

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 3, 2026.

Round-trip from

$124
(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 3, 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

Mon 3/2

3:28 pm-8:15 am

1 stop16h 47m

Los Angeles

Mon 3/9

9:23 pm-1:28 pm

1 stop16h 05m

$124

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Tue 3/3

2:06 pm-8:15 am

1 stop18h 09m

Los Angeles

Tue 3/17

6:30 pm-1:28 pm

1 stop18h 58m

$127

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Wed 2/25

7:17 pm-7:21 am

1 stop12h 04m

Los Angeles

Wed 3/4

9:12 am-1:11 pm

1 stop3h 59m

$129

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Mon 2/16

6:43 pm-8:15 am

1 stop13h 32m

Los Angeles

Thu 2/19

9:12 am-1:11 pm

1 stop3h 59m

$131

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Thu 3/5

2:08 pm-12:30 am

1 stop10h 22m

Los Angeles

Sat 3/7

6:15 am-11:59 pm

1 stop17h 44m

$141

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Fri 2/27

9:43 pm-8:15 am

1 stop10h 32m

Los Angeles

Fri 3/6

9:12 am-3:37 pm

1 stop6h 25m

$143

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Tue 3/3

2:06 pm-8:15 am

1 stop18h 09m

Los Angeles

Mon 3/23

8:19 pm-1:28 pm

1 stop17h 09m

$145

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Tue 3/3

2:06 pm-8:15 am

1 stop18h 09m

Los Angeles

Wed 3/25

6:30 pm-7:12 am

1 stop12h 42m

$145

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Mon 3/2

6:43 pm-8:15 am

1 stop13h 32m

Los Angeles

Wed 3/25

6:30 pm-7:12 am

1 stop12h 42m

$145

OntarioLos Angeles

ONT - LAX

ONTLAX

Ontario

Wed 3/4

7:17 pm-7:21 am

1 stop12h 04m

Los Angeles

Wed 3/25

1:39 pm-9:03 pm

1 stop7h 24m

$149

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/2

Showing 1-10 of 20 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.

  • How long is the flight from Ontario to Riverside?

    A quick flight from Ontario to Riverside can take about 10h 22m. 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.

  • 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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