$43+ Cheap flights from California to Ontario (ONT)
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 8/22. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ONT
Aug 5 — Aug 121
Round-trip
1 adult, Economy
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Find cheap flights from California to Ontario with Cheapflights
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Cheapest flights from California to OntarioExplore the most affordable flight options available from California to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 6, 2026.
Explore the most affordable flight options available from California to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 6, 2026.
This Super.com deal was found by Cheapflights users on 7/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/19:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Sat 8/88:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/2![Frontier logo]()
$70
This Frontier deal was found by Cheapflights users on 7/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/229:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Wed 8/263:13 pm
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/1![Frontier logo]()
$71
This Super.com deal was found by Cheapflights users on 7/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/89:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Mon 8/108:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/2![Frontier logo]()
$73
This Frontier deal was found by Cheapflights users on 7/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/139:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Wed 8/193:13 pm
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/1![Frontier logo]()
$74
This Super.com deal was found by Cheapflights users on 7/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/39:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Tue 8/48:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 7/2![Frontier logo]()
$81
This Frontier deal was found by Cheapflights users on 7/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/39:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Sat 8/88:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/1![Frontier logo]()
$82
This Super.com deal was found by Cheapflights users on 7/3. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/411:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Sat 8/88:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/3![Frontier logo]()
$87
This Frontier deal was found by Cheapflights users on 7/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/19:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Wed 8/128:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/3![Frontier logo]()
$88
This Frontier deal was found by Cheapflights users on 7/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/112:33 pm
SFO
- ONT
Nonstop1h 30m
Frontier
Sat 9/58:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/2![Frontier logo]()
$89
This Frontier deal was found by Cheapflights users on 7/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/19:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Thu 8/68:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/3![Frontier logo]()
$90
This Super.com deal was found by Cheapflights users on 7/3. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/139:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Thu 8/208:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/3![Frontier logo]()
$91
This Super.com deal was found by Cheapflights users on 7/1. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/12:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Tue 9/152:58 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 7/1![Frontier logo]()
$115
Best flights from California to OntarioDiscover carefully curated flight deals from California to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 6, 2026.
Discover carefully curated flight deals from California to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 6, 2026.
This Alaska Airlines deal was found by Cheapflights users on 7/4. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/192:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Sun 8/234:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/4![Alaska Airlines logo]()
$157
This Southwest deal was found by Cheapflights users on 7/2. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:30 am
SJC
- ONT
Nonstop1h 20m
Southwest
Sat 8/152:55 pm
ONT
- SJC
1 stop4h 30m
Southwest
Deal found 7/2![Southwest logo]()
$159
This United Airlines deal was found by Cheapflights users on 7/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/110:37 am
SFO
- ONT
Nonstop1h 35m
United Airlines
Tue 9/156:08 am
ONT
- SFO
Nonstop1h 27m
United Airlines
Deal found 7/2![United Airlines logo]()
$187
This Frontier deal was found by Cheapflights users on 7/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1911:51 am
RNO
- ONT
1 stop4h 03m
Frontier
Fri 8/2111:50 am
ONT
- RNO
1 stop7h 57m
Frontier
Deal found 7/1![Frontier logo]()
$225
This Delta deal was found by Cheapflights users on 7/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/17:15 pm
SMF
- ONT
1 stop4h 32m
Delta
Sun 10/41:04 pm
ONT
- SMF
1 stop5h 15m
Delta
Deal found 7/3![Delta logo]()
$279
This Southwest deal was found by Cheapflights users on 7/2. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/19:45 am
OAK
- ONT
Nonstop1h 20m
Southwest
Sat 8/84:00 pm
ONT
- OAK
Nonstop1h 20m
Southwest
Deal found 7/2![Southwest logo]()
$187
This Priceline deal was found by Cheapflights users on 7/6. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/124:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Fri 8/214:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/6![Alaska Airlines logo]()
$192
This Southwest deal was found by Cheapflights users on 7/2. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/188:30 pm
OAK
- ONT
Nonstop1h 25m
Southwest
Wed 8/196:40 am
ONT
- OAK
1 stop6h 20m
Southwest
Deal found 7/2![Southwest logo]()
$197
This United Airlines deal was found by Cheapflights users on 7/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/84:55 pm
SFO
- ONT
Nonstop1h 38m
United Airlines
Mon 8/106:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Deal found 7/2![United Airlines logo]()
$220
This Alaska Airlines deal was found by Cheapflights users on 7/4. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/312:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Wed 9/24:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 7/4![Alaska Airlines logo]()
$217
This Southwest deal was found by Cheapflights users on 7/3. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/196:00 am
STS
- ONT
2 stops7h 35m
Southwest
Sat 8/225:40 am
ONT
- STS
1 stop6h 25m
Southwest
Deal found 7/3![Southwest logo]()
$217
This United Airlines deal was found by Cheapflights users on 7/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/610:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Mon 8/106:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Deal found 7/1![United Airlines logo]()
$251
This Southwest deal was found by Cheapflights users on 7/3. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/191:40 pm
STS
- ONT
1 stop7h 15m
Southwest
Sun 8/236:25 am
ONT
- STS
1 stop7h 10m
Southwest
Deal found 7/3![Southwest logo]()
$217
This Southwest deal was found by Cheapflights users on 7/3. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/155:00 am
SFO
- ONT
1 stop3h 45m
Southwest
Sat 8/222:55 pm
ONT
- SFO
1 stop5h 40m
Southwest
Deal found 7/3![Southwest logo]()
$221
This Delta deal was found by Cheapflights users on 7/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/215:28 pm
MFR
- ONT
1 stop5h 17m
Delta
Thu 8/276:20 am
ONT
- MFR
1 stop6h 33m
Delta
Deal found 7/1![Delta logo]()
$337
This United Airlines deal was found by Cheapflights users on 7/5. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/28:00 am
MRY
- ONT
1 stop4h 12m
United Airlines
Sat 8/86:00 am
ONT
- MRY
1 stop5h 10m
United Airlines
Deal found 7/5![United Airlines logo]()
$279
This Alaska Airlines deal was found by Cheapflights users on 7/5. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/214:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Sat 7/256:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Deal found 7/5![Alaska Airlines logo]()
$287
This Southwest deal was found by Cheapflights users on 7/1. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/257:35 am
LAS
- ONT
Nonstop1h 05m
Southwest
Sat 8/11:25 pm
ONT
- LAS
2 stops7h 25m
Southwest
Deal found 7/1![Southwest logo]()
$232
This United Airlines deal was found by Cheapflights users on 7/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1210:37 am
SFO
- ONT
Nonstop1h 35m
United Airlines
Sun 8/237:13 pm
ONT
- SFO
Nonstop1h 43m
United Airlines
Deal found 7/1![United Airlines logo]()
$283
This Alaska Airlines deal was found by Cheapflights users on 7/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/164:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Mon 7/206:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Deal found 7/2![Alaska Airlines logo]()
$287
This United Airlines deal was found by Cheapflights users on 7/3. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/238:00 am
MRY
- ONT
1 stop4h 12m
United Airlines
Mon 7/276:39 pm
ONT
- MRY
1 stop5h 08m
United Airlines
Deal found 7/3![United Airlines logo]()
$294
This Delta deal was found by Cheapflights users on 7/5. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/245:15 am
MFR
- ONT
1 stop6h 55m
Delta
Mon 7/276:01 pm
ONT
- MFR
1 stop5h 10m
Delta
Deal found 7/5![Delta logo]()
$397
This Alaska Airlines deal was found by Cheapflights users on 7/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/192:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Sat 8/2212:00 pm
ONT
- STS
1 stop9h 59m
Alaska Airlines
Deal found 7/2![Alaska Airlines logo]()
$300
This Southwest deal was found by Cheapflights users on 7/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/126:00 am
STS
- ONT
2 stops7h 35m
Southwest
Fri 8/218:30 am
ONT
- STS
1 stop5h 50m
Southwest
Deal found 7/6![Southwest logo]()
$252
This Southwest deal was found by Cheapflights users on 7/1. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/158:00 am
LAS
- ONT
2 stops6h 15m
Southwest
Mon 8/176:30 am
ONT
- LAS
1 stop5h 25m
Southwest
Deal found 7/1![Southwest logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 7/4. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/305:10 am
MFR
- ONT
1 stop5h 39m
Alaska Airlines
Tue 11/310:37 am
ONT
- MFR
1 stop4h 59m
Alaska Airlines
Deal found 7/4![Alaska Airlines logo]()
$337
This United Airlines deal was found by Cheapflights users on 7/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/202:07 pm
MFR
- ONT
1 stop4h 04m
United Airlines
Thu 8/276:08 am
ONT
- MFR
1 stop5h 46m
United Airlines
Deal found 7/1![United Airlines logo]()
$337
This Southwest deal was found by Cheapflights users on 7/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1812:45 pm
OAK
- ONT
2 stops5h 40m
Southwest
Tue 8/256:00 am
ONT
- OAK
Nonstop1h 15m
Southwest
Deal found 7/4![Southwest logo]()
$264
This Alaska Airlines deal was found by Cheapflights users on 7/3. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/67:50 pm
MFR
- ONT
1 stop15h 24m
Alaska Airlines
Sun 8/99:20 pm
ONT
- MFR
1 stop12h 31m
Alaska Airlines
Deal found 7/3![Alaska Airlines logo]()
$337
This United Airlines deal was found by Cheapflights users on 7/3. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2512:51 pm
SJC
- ONT
1 stop8h 02m
United Airlines
Thu 8/271:18 pm
ONT
- SJC
1 stop7h 39m
United Airlines
Deal found 7/3![United Airlines logo]()
$341
Last-minute flights from California to OntarioDiscover last-minute flight deals from California to Ontario. Data last updated July 6, 2026 and is based on user searches.
Discover last-minute flight deals from California to Ontario. Data last updated July 6, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 7/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/259:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Wed 7/298:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 7/3![Frontier logo]()
$71
This Super.com deal was found by Cheapflights users on 7/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/19:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Sat 8/88:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/2![Frontier logo]()
$70
This Frontier deal was found by Cheapflights users on 7/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/19:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Wed 8/128:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/3![Frontier logo]()
$88
This Frontier deal was found by Cheapflights users on 7/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/19:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Thu 8/68:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/3![Frontier logo]()
$90
This Super.com deal was found by Cheapflights users on 7/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/39:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Tue 8/48:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 7/2![Frontier logo]()
$81
This Frontier deal was found by Cheapflights users on 7/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/39:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Sat 8/88:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/1![Frontier logo]()
$82
This Super.com deal was found by Cheapflights users on 7/3. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/411:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Sat 8/88:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/3![Frontier logo]()
$87
This Super.com deal was found by Cheapflights users on 7/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/89:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Mon 8/108:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/2![Frontier logo]()
$73
This Super.com deal was found by Cheapflights users on 7/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/122:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Sat 8/1511:47 am
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 7/2![Frontier logo]()
$115
This Frontier deal was found by Cheapflights users on 7/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/139:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Wed 8/193:13 pm
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/1![Frontier logo]()
$74
This Super.com deal was found by Cheapflights users on 7/3. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/139:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Thu 8/208:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/3![Frontier logo]()
$91
This Super.com deal was found by Cheapflights users on 7/3. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/159:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Mon 8/178:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/3![Frontier logo]()
$89
One-way flights from California to OntarioSearch for one-way flight options from California to Ontario. Find affordable one-way fares based on user searches. Data last updated July 6, 2026.
Search for one-way flight options from California to Ontario. Find affordable one-way fares based on user searches. Data last updated July 6, 2026.
This iWofly deal was found by Cheapflights users on 7/2. 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/229:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/2![Frontier logo]()
$43
This Frontier deal was found by Cheapflights users on 7/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/812:33 pm
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 7/3![Frontier logo]()
$44
This Kiwi.com deal was found by Cheapflights users on 7/3. 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.
Thu 10/112:31 pm
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/3![Frontier logo]()
$45
This Booking.com deal was found by Cheapflights users on 7/2. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/69:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/2![Frontier logo]()
$46
This Mytrip deal was found by Cheapflights users on 7/3. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/209:00 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/3![Frontier logo]()
$47
This CheapOair deal was found by Cheapflights users on 7/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/912:11 pm
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/3![Frontier logo]()
$51
This Super.com deal was found by Cheapflights users on 7/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/39:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 7/2![Frontier logo]()
$53
This Frontier deal was found by Cheapflights users on 7/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2912:11 pm
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/2![Frontier logo]()
$58
This Super.com deal was found by Cheapflights users on 7/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/112:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 7/2![Frontier logo]()
$58
This United Airlines deal was found by Cheapflights users on 7/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/309:25 pm
SFO
- ONT
Nonstop1h 34m
United Airlines
Deal found 7/2![United Airlines logo]()
$59
This Southwest deal was found by Cheapflights users on 7/2. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/256:05 am
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 7/2![Southwest logo]()
$59
This CheapOair deal was found by Cheapflights users on 7/2. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/152:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 7/2![Frontier logo]()
$59
Find flight deals from California to Ontario
Keep the following information in mind while searching for California to Ontario flight deals. Data was last updated July 6, 2026.
Round-trip from | $70 (Super.com) |
|---|---|
One-way from | $43 (iWofly) |
Good round-trip deal | $156 or less |
Good one-way deal | $68 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from California to Ontario 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 6, 2026.
Use the filters below to find and compare flights from California to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Wed 8/19
2:09 pm-3:47 pm
Nonstop1h 38m
Ontario
Sun 8/23
4:27 pm-6:07 pm
Nonstop1h 40m
$157
San JoseOntario
SJC - ONT
SJCONT
San Jose
Thu 8/13
6:30 am-7:50 am
Nonstop1h 20m
Ontario
Sat 8/15
2:55 pm-7:25 pm
1 stop4h 30m
$159
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Tue 9/1
10:37 am-12:12 pm
Nonstop1h 35m
Ontario
Tue 9/15
6:08 am-7:35 am
Nonstop1h 27m
$187
Quickest round-trip
OaklandOntario
OAK - ONT
OAKONT
Oakland
Sat 8/1
9:45 am-11:05 am
Nonstop1h 20m
Ontario
Sat 8/8
4:00 pm-5:20 pm
Nonstop1h 20m
$187
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Wed 8/12
4:35 pm-6:03 pm
Nonstop1h 28m
Ontario
Fri 8/21
4:27 pm-6:07 pm
Nonstop1h 40m
$192
OaklandOntario
OAK - ONT
OAKONT
Oakland
Tue 8/18
8:30 pm-9:55 pm
Nonstop1h 25m
Ontario
Wed 8/19
6:40 am-1:00 pm
1 stop6h 20m
$197
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Mon 8/31
2:09 pm-3:47 pm
Nonstop1h 38m
Ontario
Wed 9/2
4:27 pm-6:07 pm
Nonstop1h 40m
$217
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Wed 8/19
6:00 am-1:35 pm
2 stops7h 35m
Ontario
Sat 8/22
5:40 am-12:05 pm
1 stop6h 25m
$217
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Wed 8/19
1:40 pm-8:55 pm
1 stop7h 15m
Ontario
Sun 8/23
6:25 am-1:35 pm
1 stop7h 10m
$217
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Sat 8/8
4:55 pm-6:33 pm
Nonstop1h 38m
Ontario
Mon 8/10
6:00 am-7:25 am
Nonstop1h 25m
$220
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from California to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from California with our price prediction graph.
SFO-ONT
LAS-ONT
STS-ONT
SJC-ONT
RNO-ONT
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 California to Ontario
USCA-ONT
SFO-ONT
LAS-ONT
STS-ONT
SJC-ONT
What is the cheapest month to book a flight from California to Ontario?
Currently, January is the cheapest month in which you can book a flight from California to Ontario (average of $19). Flying from California to Ontario in November is currently the most expensive (average of $686). 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.
What is the cheapest time of day to fly from CA to ONT?
Find hourly flight availability from California to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 6, 2026.
It’s typically best to fly out from California to Ontario in the evening. Doing so could potentially save you 26% on the flight price compared to flying at noon, which is usually more expensive.
How far ahead should I book a flight from California to Ontario?
Booking 77 days in advance of your planned departure date is, on average, the best time to get cheap flights from California to Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest day to fly from California to Ontario?
Use this chart to determine the cheapest time to fly round-trip from California to Ontario. Price data was last updated on July 4, 2026.
Travelers seeking maximum savings on their California to Ontario flight should consider departing on Monday evenings when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated July 6, 2026.
See what other customers who have flown with Alaska Airlines,Southwest, andDelta from California to Ontario have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
7.8
Crew
8.5
Food
7.0
Overall
7.9
Entertainment
7.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Comfort
7.8
Crew
8.5
Food
7.0
Overall
7.9
Entertainment
7.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Comfort
7.8
Crew
8.5
Food
7.0
Overall
7.9
Entertainment
7.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Comfort
7.8
Crew
8.5
Food
7.0
Overall
7.9
Entertainment
7.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Comfort
7.8
Crew
8.5
Food
7.0
Overall
7.9
Entertainment
7.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Comfort
7.8
Crew
8.5
Food
7.0
Overall
7.9
Entertainment
7.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Related info for your journey
Find useful and relevant information for your journey from California to Ontario. 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
Ontario flight routes
Other flight options
Popular flights
Top destinations
Alternative routes for California to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from California to Ontario by cabin class
Find flights from California to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on July 6, 2026.
California and Ontario flights
Browse other California and Ontario flight options. Last updated on July 6, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
California to Ontario flights
Consider these flights traveling from California to Ontario.
Top 5 airlines flying from California to Ontario
Discover the top 5 airlines that operate flights from California to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 6, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$39 | Average$171 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$66 | Average$256 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$103 | Average$346 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$122 | Average$304 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$142 | Average$302 | FlexibilityNo cancel fee | On-time62% |