$62+ Cheap flights from Fremont, CA 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 6/29. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ONT
Jul 9 — Jul 161
Round-trip
1 adult, Economy
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Find cheap flights from Fremont to Ontario 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.Cheapflights Tip: The best prices from Fremont to Ontario are usually found in June or August, booked 70 days in advance, depart on a Monday or Wednesday and return on a Friday
Cheap flight deals from Fremont to Ontario
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Best
Last-minute
One-way
Cheapest flights from Fremont to OntarioExplore the most affordable flight options available from Fremont to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 9, 2026.
Explore the most affordable flight options available from Fremont to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 9, 2026.
This Super.com deal was found by Cheapflights users on 6/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1211:15 am
SFO
- ONT
Nonstop1h 33m
Frontier
Mon 8/178:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/4![Frontier logo]()
$86
This Super.com deal was found by Cheapflights users on 6/7. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/309:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Thu 8/68:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/7![Frontier logo]()
$87
This Frontier deal was found by Cheapflights users on 6/7. 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 Frontier 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
Thu 8/138:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/7![Frontier logo]()
$88
This Frontier deal was found by Cheapflights users on 6/5. 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 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
Sat 8/158:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/5![Frontier logo]()
$89
This Super.com deal was found by Cheapflights users on 6/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/259:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Wed 7/18:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 6/4![Frontier logo]()
$91
This Frontier deal was found by Cheapflights users on 6/4. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/299:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Wed 7/18:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 6/4![Frontier logo]()
$92
This Super.com deal was found by Cheapflights users on 6/5. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/2811:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Sat 8/88:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/5![Frontier logo]()
$93
This Frontier deal was found by Cheapflights users on 6/5. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/109:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Tue 8/118:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/5![Frontier logo]()
$94
This Super.com deal was found by Cheapflights users on 6/6. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/1511:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Sat 7/188:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 6/6![Frontier logo]()
$96
This Jettzy deal was found by Cheapflights users on 6/5. 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 Jettzy is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/1411:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Thu 7/168:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 6/5![Frontier logo]()
$97
This Super.com deal was found by Cheapflights users on 6/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/111:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Sat 7/48:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 6/4![Frontier logo]()
$101
This Frontier deal was found by Cheapflights users on 6/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/811:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Mon 7/138:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 6/6![Frontier logo]()
$102
Best flights from Fremont to OntarioDiscover carefully curated flight deals from Fremont to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 9, 2026.
Discover carefully curated flight deals from Fremont to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 9, 2026.
This Southwest deal was found by Cheapflights users on 6/4. 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.
Wed 7/82:15 pm
SFO
- ONT
2 stops8h 50m
Southwest
Wed 7/157:20 pm
ONT
- SFO
1 stop4h 10m
Southwest
Deal found 6/4![Southwest logo]()
$162
This United Airlines deal was found by Cheapflights users on 6/5. 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.
Wed 7/19:00 pm
SFO
- ONT
Nonstop1h 37m
United Airlines
Sat 7/41:50 pm
ONT
- SFO
Nonstop1h 25m
United Airlines
Deal found 6/5![United Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 6/5. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/1510:25 am
SFO
- ONT
1 stop5h 05m
Southwest
Tue 7/214:35 pm
ONT
- SFO
2 stops6h 00m
Southwest
Deal found 6/5![Southwest logo]()
$162
This Southwest deal was found by Cheapflights users on 6/5. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/166:45 pm
SFO
- ONT
1 stop5h 25m
Southwest
Tue 7/214:35 pm
ONT
- SFO
2 stops6h 00m
Southwest
Deal found 6/5![Southwest logo]()
$212
This United Airlines deal was found by Cheapflights users on 6/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/184:55 pm
SFO
- ONT
Nonstop1h 38m
United Airlines
Mon 7/206:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Deal found 6/7![United Airlines logo]()
$315
This Southwest deal was found by Cheapflights users on 6/5. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/215:10 am
SFO
- ONT
1 stop4h 45m
Southwest
Mon 8/242:40 pm
ONT
- SFO
2 stops5h 55m
Southwest
Deal found 6/5![Southwest logo]()
$265
This Southwest deal was found by Cheapflights users on 6/6. 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.
Sat 7/115:00 am
SFO
- ONT
1 stop3h 40m
Southwest
Sat 7/116:30 pm
ONT
- SFO
1 stop6h 05m
Southwest
Deal found 6/6![Southwest logo]()
$267
This United Airlines deal was found by Cheapflights users on 6/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/1110:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Sat 7/114:20 pm
ONT
- SFO
Nonstop1h 30m
United Airlines
Deal found 6/6![United Airlines logo]()
$344
This Southwest deal was found by Cheapflights users on 6/6. 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 7/811:30 am
SFO
- ONT
1 stop5h 35m
Southwest
Tue 7/144:35 pm
ONT
- SFO
2 stops6h 00m
Southwest
Deal found 6/6![Southwest logo]()
$272
This United Airlines deal was found by Cheapflights users on 6/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/610:37 am
SFO
- ONT
Nonstop1h 35m
United Airlines
Wed 9/96:00 am
ONT
- SFO
Nonstop1h 27m
United Airlines
Deal found 6/6![United Airlines logo]()
$349
This Southwest deal was found by Cheapflights users on 6/6. 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 7/12:15 pm
SFO
- ONT
2 stops8h 45m
Southwest
Sat 7/45:25 am
ONT
- SFO
1 stop3h 45m
Southwest
Deal found 6/6![Southwest logo]()
$303
This Southwest deal was found by Cheapflights users on 6/6. 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.
Thu 6/253:45 pm
SFO
- ONT
2 stops8h 20m
Southwest
Sat 6/276:30 pm
ONT
- SFO
1 stop6h 05m
Southwest
Deal found 6/6![Southwest logo]()
$343
Last-minute flights from Fremont to OntarioDiscover last-minute flight deals from Fremont to Ontario. Data last updated June 9, 2026 and is based on user searches.
Discover last-minute flight deals from Fremont to Ontario. Data last updated June 9, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 6/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/259:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Wed 7/18:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 6/4![Frontier logo]()
$91
This Frontier deal was found by Cheapflights users on 6/4. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/299:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Wed 7/18:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 6/4![Frontier logo]()
$92
This Super.com deal was found by Cheapflights users on 6/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/111:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Sat 7/48:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 6/4![Frontier logo]()
$101
This Frontier deal was found by Cheapflights users on 6/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/811:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Mon 7/138:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 6/6![Frontier logo]()
$102
This Super.com deal was found by Cheapflights users on 6/6. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/1511:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Sat 7/188:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 6/6![Frontier logo]()
$96
This Super.com deal was found by Cheapflights users on 6/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/279:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Wed 7/298:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 6/4![Frontier logo]()
$106
This Super.com deal was found by Cheapflights users on 6/5. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/2811:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Sat 8/88:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/5![Frontier logo]()
$93
This Frontier deal was found by Cheapflights users on 6/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2911:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Sat 8/88:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/6![Frontier logo]()
$94
This Super.com deal was found by Cheapflights users on 6/7. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/309:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Thu 8/68:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/7![Frontier logo]()
$87
One-way flights from Fremont to OntarioSearch for one-way flight options from Fremont to Ontario. Find affordable one-way fares based on user searches. Data last updated June 9, 2026.
Search for one-way flight options from Fremont to Ontario. Find affordable one-way fares based on user searches. Data last updated June 9, 2026.
This iWofly deal was found by Cheapflights users on 6/8. 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/299:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 6/8![Frontier logo]()
$62
This Super.com deal was found by Cheapflights users on 6/9. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/3011:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 6/9![Frontier logo]()
$63
This Frontier deal was found by Cheapflights users on 6/7. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/259:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 6/7![Frontier logo]()
$64
This Frontier deal was found by Cheapflights users on 6/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/57:19 pm
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 6/8![Frontier logo]()
$65
This Frontier deal was found by Cheapflights users on 6/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/109:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 6/6![Frontier logo]()
$66
This Super.com deal was found by Cheapflights users on 6/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/189:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/4![Frontier logo]()
$68
This Frontier deal was found by Cheapflights users on 6/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:44 pm
SFO
- ONT
Nonstop1h 33m
Frontier
Deal found 6/8![Frontier logo]()
$70
This Frontier deal was found by Cheapflights users on 6/4. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1512:31 pm
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 6/4![Frontier logo]()
$71
This Super.com deal was found by Cheapflights users on 6/5. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/139:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/5![Frontier logo]()
$72
This Frontier deal was found by Cheapflights users on 6/5. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/99:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/5![Frontier logo]()
$74
Find flight deals from Fremont to Ontario
Keep the following information in mind while searching for Fremont to Ontario flight deals. Data was last updated June 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $86 (Super.com) |
One-way from | $62 (iWofly) |
Popular in | February |
Cheapest in | June |
Average price | $144 |
Cheapflights Fare Finder
Customize your flight search to find flights from Fremont 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 June 9, 2026.
Use the filters below to find and compare flights from Fremont to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Wed 7/8
2:15 pm-11:05 pm
2 stops8h 50m
Ontario
Wed 7/15
7:20 pm-11:30 pm
1 stop4h 10m
$162
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Wed 7/15
10:25 am-3:30 pm
1 stop5h 05m
Ontario
Tue 7/21
4:35 pm-10:35 pm
2 stops6h 00m
$162
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Thu 7/16
6:45 pm-12:10 am
1 stop5h 25m
Ontario
Tue 7/21
4:35 pm-10:35 pm
2 stops6h 00m
$212
Quickest round-trip
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Wed 7/1
9:00 pm-10:37 pm
Nonstop1h 37m
Ontario
Sat 7/4
1:50 pm-3:15 pm
Nonstop1h 25m
$257
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Fri 8/21
5:10 am-9:55 am
1 stop4h 45m
Ontario
Mon 8/24
2:40 pm-8:35 pm
2 stops5h 55m
$265
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Sat 7/11
5:00 am-8:40 am
1 stop3h 40m
Ontario
Sat 7/11
6:30 pm-12:35 am
1 stop6h 05m
$267
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Wed 7/8
11:30 am-5:05 pm
1 stop5h 35m
Ontario
Tue 7/14
4:35 pm-10:35 pm
2 stops6h 00m
$272
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Wed 7/1
2:15 pm-11:00 pm
2 stops8h 45m
Ontario
Sat 7/4
5:25 am-9:10 am
1 stop3h 45m
$303
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Sat 7/18
4:55 pm-6:33 pm
Nonstop1h 38m
Ontario
Mon 7/20
6:00 am-7:25 am
Nonstop1h 25m
$315
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Thu 6/25
3:45 pm-12:05 am
2 stops8h 20m
Ontario
Sat 6/27
6:30 pm-12:35 am
1 stop6h 05m
$343
Showing 1-10 of 24 resultsSorted by cheapest first
Best time to book a flight from Fremont to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Fremont with our price prediction graph.
SFO-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 Fremont to Ontario
FR8-ONT
SFO-ONT
What is the cheapest time of day to fly from FR8 to ONT?
Find hourly flight availability from Fremont 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 June 9, 2026.
One of the essential ways to save on airfare from Fremont to Ontario is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 30% on airfare.
Weekly flight availability from Fremont to Ontario
Explore weekly flight availability from Fremont to Ontario. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 9, 2026.
The most flights from FR8 to ONT are scheduled on a Tuesday (9 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 on average).
How much does it cost to fly round-trip from Fremont to Ontario?
What is the cheapest day to fly from Fremont to Ontario?
Use this chart to determine the cheapest time to fly round-trip from Fremont to Ontario. Price data was last updated on June 8, 2026.
Travelers seeking maximum savings on their Fremont 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 June 9, 2026.
See what other customers who have flown with Southwest,Delta, andUnited Airlines from Fremont to Ontario have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Related info for your journey
Find useful and relevant information for your journey from Fremont to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Fremont 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 Fremont to Ontario by cabin class
Find flights from Fremont 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 June 9, 2026.
Fremont and Ontario flights
Browse other Fremont and Ontario flight options. Last updated on June 9, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Fremont to Ontario flights
Consider these flights traveling from Fremont to Ontario.
Top 4 airlines flying from Fremont to Ontario
Discover the top 4 airlines that operate flights from Fremont 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 June 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$39 | Average$159 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$66 | Average$245 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$68 | Average$232 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$122 | Average$278 | FlexibilityNo cancel fee | On-time63% |