$66+ 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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Sep 10 — Sep 171
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Ontario to Riverside with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Ontario to Riverside
Cheapest
Best
Last-minute
One-way
Cheapest flights from Ontario to RiversideExplore 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 August 11, 2026.
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 August 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/5. 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 9/1510:04 am -
1 stop6h 19m
Thu 10/159:15 am -
1 stop11h 02m
Deal found 8/5![Frontier logo]()
$172
This Kissandfly.com deal was found by Cheapflights users on 8/8. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/57:56 pm -
1 stop12h 34m
Sun 9/64:15 pm -
1 stop5h 40m
Deal found 8/8![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 8/5. 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 9/410:17 pm -
2 stops17h 03m
Fri 9/118:44 am -
1 stop10h 52m
Deal found 8/5![Frontier logo]()
$182
This Kiwi.com deal was found by Cheapflights users on 8/6. 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 9/33:40 pm -
1 stop6h 59m
Thu 9/108:44 am -
1 stop10h 52m
Deal found 8/6![Frontier logo]()
$184
This Kiwi.com deal was found by Cheapflights users on 8/7. 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 11/65:05 pm -
1 stop20h 56m
Mon 11/93:30 pm -
1 stop20h 32m
Deal found 8/7![Frontier logo]()
$193
This Kiwi.com deal was found by Cheapflights users on 8/5. 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 9/278:24 pm -
1 stop11h 23m
Thu 10/18:44 am -
1 stop10h 52m
Deal found 8/5![Frontier logo]()
$214
This Kiwi.com deal was found by Cheapflights users on 8/8. 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 -
2 stops19h 24m
Sat 9/129:20 pm -
1 stop9h 44m
Deal found 8/8![Frontier logo]()
$215
This Kiwi.com deal was found by Cheapflights users on 8/5. 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 9/2310:04 am -
1 stop6h 19m
Tue 9/295:20 pm -
1 stop23h 39m
Deal found 8/5![Frontier logo]()
$217
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 9/87:56 pm -
2 stops35h 58m
Tue 9/153:35 pm -
1 stop22h 10m
Deal found 8/9![Frontier logo]()
$218
Best flights from Ontario to RiversideDiscover carefully curated flight deals from Ontario to Riverside that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 11, 2026.
Discover carefully curated flight deals from Ontario to Riverside that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 11, 2026.
This Kissandfly.com deal was found by Cheapflights users on 8/8. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/57:56 pm -
1 stop12h 34m
Sun 9/64:15 pm -
1 stop5h 40m
Deal found 8/8![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 8/6. 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 9/33:40 pm -
1 stop6h 59m
Thu 9/108:44 am -
1 stop10h 52m
Deal found 8/6![Frontier logo]()
$184
This Kiwi.com deal was found by Cheapflights users on 8/7. 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 11/65:05 pm -
1 stop20h 56m
Mon 11/93:30 pm -
1 stop20h 32m
Deal found 8/7![Frontier logo]()
$193
This Kiwi.com deal was found by Cheapflights users on 8/5. 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 9/2310:04 am -
1 stop6h 19m
Tue 9/295:20 pm -
1 stop23h 39m
Deal found 8/5![Frontier logo]()
$217
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 9/87:56 pm -
2 stops35h 58m
Tue 9/153:35 pm -
1 stop22h 10m
Deal found 8/9![Frontier logo]()
$218
This Kiwi.com deal was found by Cheapflights users on 8/5. 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 9/410:17 pm -
1 stop24h 22m
Fri 9/118:44 am -
1 stop10h 52m
Deal found 8/5![Frontier logo]()
$219
This Kiwi.com deal was found by Cheapflights users on 8/5. 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 9/38:48 am -
1 stop13h 06m
Mon 9/710:22 pm -
1 stop17h 27m
Deal found 8/5![Frontier logo]()
$223
This Kiwi.com deal was found by Cheapflights users on 8/5. 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 9/1510:04 am -
1 stop6h 19m
Sun 9/207:44 pm -
1 stop23h 52m
Deal found 8/5![Frontier logo]()
$252
Last-minute flights from Ontario to RiversideDiscover last-minute flight deals from Ontario to Riverside. Data last updated August 11, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Riverside. Data last updated August 11, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 8/6. 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 9/33:40 pm -
1 stop6h 59m
Thu 9/108:44 am -
1 stop10h 52m
Deal found 8/6![Frontier logo]()
$184
This Kiwi.com deal was found by Cheapflights users on 8/5. 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 9/410:17 pm -
2 stops17h 03m
Fri 9/118:44 am -
1 stop10h 52m
Deal found 8/5![Frontier logo]()
$182
This Kissandfly.com deal was found by Cheapflights users on 8/8. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/57:56 pm -
1 stop12h 34m
Sun 9/64:15 pm -
1 stop5h 40m
Deal found 8/8![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 8/8. 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 -
2 stops19h 24m
Sat 9/129:20 pm -
1 stop9h 44m
Deal found 8/8![Frontier logo]()
$215
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 9/87:56 pm -
2 stops35h 58m
Tue 9/153:35 pm -
1 stop22h 10m
Deal found 8/9![Frontier logo]()
$218
This Kiwi.com deal was found by Cheapflights users on 8/5. 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 9/1510:04 am -
1 stop6h 19m
Thu 10/159:15 am -
1 stop11h 02m
Deal found 8/5![Frontier logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 8/5. 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 9/2310:04 am -
1 stop6h 19m
Tue 9/295:20 pm -
1 stop23h 39m
Deal found 8/5![Frontier logo]()
$217
This Kiwi.com deal was found by Cheapflights users on 8/5. 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 9/278:24 pm -
1 stop11h 23m
Thu 10/18:44 am -
1 stop10h 52m
Deal found 8/5![Frontier logo]()
$214
One-way flights from Ontario to RiversideSearch for one-way flight options from Ontario to Riverside. Find affordable one-way fares based on user searches. Data last updated August 11, 2026.
Search for one-way flight options from Ontario to Riverside. Find affordable one-way fares based on user searches. Data last updated August 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/6. 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 9/13:13 pm -
1 stop6h 41m
Deal found 8/6![Frontier logo]()
$66
This Kiwi.com deal was found by Cheapflights users on 8/6. 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 8/2810:17 pm -
1 stop24h 22m
Deal found 8/6![Frontier logo]()
$98
This Kiwi.com deal was found by Cheapflights users on 8/5. 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 9/68:48 am -
1 stop13h 06m
Deal found 8/5![Frontier logo]()
$102
This Kiwi.com deal was found by Cheapflights users on 8/7. 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 9/710:17 pm -
1 stop24h 22m
Deal found 8/7![Frontier logo]()
$125
This Kiwi.com deal was found by Cheapflights users on 8/6. 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 9/17:56 pm -
3 stops20h 00m
Deal found 8/6![Multiple Airlines logo]()
$218
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 8/149:36 am -
2 stops38h 21m
Deal found 8/10![Frontier logo]()
$219
This Kiwi.com deal was found by Cheapflights users on 8/8. 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 8/228:48 am -
2 stops24h 41m
Deal found 8/8![Frontier logo]()
$230
This Kiwi.com deal was found by Cheapflights users on 8/6. 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 8/213:40 pm -
1 stop6h 59m
Deal found 8/6![Frontier logo]()
$239
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 August 11, 2026.
Round-trip from | $172 (Kiwi.com) |
|---|---|
One-way from | $66 (Kiwi.com) |
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 August 11, 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
Cheapest round-trip
OntarioLos Angeles
ONT Ontario - LAX Los Angeles
ONTLAX
Ontario
Sat 9/5
7:56 pm-8:30 am
1 stop12h 34m
Los Angeles
Sun 9/6
4:15 pm-9:55 pm
1 stop5h 40m
$180
Quickest round-trip
OntarioLos Angeles
ONT Ontario - LAX Los Angeles
ONTLAX
Ontario
Thu 9/3
3:40 pm-10:39 pm
1 stop6h 59m
Los Angeles
Thu 9/10
8:44 am-7:36 pm
1 stop10h 52m
$184
OntarioLos Angeles
ONT Ontario - LAX Los Angeles
ONTLAX
Ontario
Fri 11/6
5:05 pm-2:01 pm
1 stop20h 56m
Los Angeles
Mon 11/9
3:30 pm-12:02 pm
1 stop20h 32m
$193
OntarioLos Angeles
ONT Ontario - LAX Los Angeles
ONTLAX
Ontario
Wed 9/23
10:04 am-4:23 pm
1 stop6h 19m
Los Angeles
Tue 9/29
5:20 pm-4:59 pm
1 stop23h 39m
$217
OntarioLos Angeles
ONT Ontario - LAX Los Angeles
ONTLAX
Ontario
Tue 9/8
7:56 pm-7:54 am
2 stops35h 58m
Los Angeles
Tue 9/15
3:35 pm-1:45 pm
1 stop22h 10m
$218
OntarioLos Angeles
ONT Ontario - LAX Los Angeles
ONTLAX
Ontario
Fri 9/4
10:17 pm-10:39 pm
1 stop24h 22m
Los Angeles
Fri 9/11
8:44 am-7:36 pm
1 stop10h 52m
$219
OntarioLos Angeles
ONT Ontario - LAX Los Angeles
ONTLAX
Ontario
Thu 9/3
8:48 am-9:54 pm
1 stop13h 06m
Los Angeles
Mon 9/7
10:22 pm-3:49 pm
1 stop17h 27m
$223
OntarioLos Angeles
ONT Ontario - LAX Los Angeles
ONTLAX
Ontario
Tue 9/15
10:04 am-4:23 pm
1 stop6h 19m
Los Angeles
Sun 9/20
7:44 pm-7:36 pm
1 stop23h 52m
$252
Cheapest one-way
Quickest one-way
OntarioLos Angeles
ONT Ontario - LAX Los Angeles
ONTLAX
Ontario
Tue 9/1
3:13 pm-9:54 pm
1 stop6h 41m
$66
OntarioLos Angeles
ONT Ontario - LAX Los Angeles
ONTLAX
Ontario
Fri 8/28
10:17 pm-10:39 pm
1 stop24h 22m
$98
Showing 1-10 of 19 resultsSorted by cheapest first
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.
ONT-LAX
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
ONT-R1V
ONT-LAX
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.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Ontario
Popular flights
Top destinations