$62+ Cheap flights from Ontario (ONT) to Fremont, 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 11/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SFO
Jul 9 — Jul 161
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Fremont 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 Ontario to Fremont are usually found in August or October, booked 77 days in advance, depart on a Friday or Thursday and return on a Monday
Cheap flight deals from Ontario to Fremont
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Best
Last-minute
One-way
Cheapest flights from Ontario to FremontExplore the most affordable flight options available from Ontario to Fremont. 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 Ontario to Fremont. 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 6/6. 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.
Thu 6/258:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Tue 6/3011:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 6/6![Frontier logo]()
$104
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 6/298:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Tue 6/3011:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 6/5![Frontier logo]()
$105
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.
Mon 7/208:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Thu 7/309:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/7![Frontier logo]()
$107
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 9/28:33 pm
ONT
- SFO
Nonstop1h 32m
Frontier
Sat 9/59:31 am
SFO
- ONT
Nonstop1h 27m
Frontier
Deal found 6/6![Frontier logo]()
$109
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 8/68:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 8/109:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 6/4![Frontier logo]()
$110
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.
Fri 7/178:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Tue 7/2111:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Deal found 6/6![Frontier logo]()
$116
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 7/98:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Tue 7/1411:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Deal found 6/5![Frontier logo]()
$117
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 7/48:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Sat 8/89:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 6/5![Frontier logo]()
$118
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/18:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Tue 7/74:30 pm
SFO
- ONT
1 stop15h 33m
Frontier
Deal found 6/4![Frontier logo]()
$121
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.
Tue 7/218:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Sat 8/19:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/7![Frontier logo]()
$123
Best flights from Ontario to FremontDiscover carefully curated flight deals from Ontario to Fremont 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 Ontario to Fremont 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 6/5. 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.
Tue 7/74:35 pm
ONT
- SFO
2 stops6h 00m
Southwest
Sat 7/115:00 am
SFO
- ONT
2 stops8h 40m
Southwest
Deal found 6/5![Southwest logo]()
$217
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/56:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Wed 8/510:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 6/9![United Airlines logo]()
$226
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.
Sat 10/108:00 am
ONT
- SFO
Nonstop1h 27m
United Airlines
Tue 10/131:40 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 6/5![United Airlines logo]()
$229
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.
Sat 7/116:30 pm
ONT
- SFO
1 stop6h 05m
Southwest
Mon 7/136:45 pm
SFO
- ONT
1 stop5h 25m
Southwest
Deal found 6/5![Southwest logo]()
$257
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/78:00 am
ONT
- SFO
Nonstop1h 27m
United Airlines
Thu 10/88:40 am
SFO
- ONT
Nonstop1h 43m
United Airlines
Deal found 6/9![United Airlines logo]()
$270
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/25:15 pm
ONT
- SFO
2 stops7h 15m
Southwest
Mon 7/63:45 pm
SFO
- ONT
2 stops8h 25m
Southwest
Deal found 6/8![Southwest logo]()
$278
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/151:50 pm
ONT
- SFO
Nonstop1h 25m
United Airlines
Mon 7/2010:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 6/8![United Airlines logo]()
$302
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/235:15 am
ONT
- SFO
2 stops7h 45m
Southwest
Fri 7/245:00 am
SFO
- ONT
2 stops6h 20m
Southwest
Deal found 6/8![Southwest logo]()
$309
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/296:00 am
ONT
- SFO
Nonstop1h 29m
United Airlines
Sat 10/3110:50 am
SFO
- ONT
Nonstop1h 30m
United Airlines
Deal found 6/9![United Airlines logo]()
$309
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.
Thu 7/231:50 pm
ONT
- SFO
Nonstop1h 25m
United Airlines
Sat 7/2510:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 6/7![United Airlines logo]()
$315
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.
Tue 9/221:56 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Wed 9/307:00 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 6/6![United Airlines logo]()
$319
Last-minute flights from Ontario to FremontDiscover last-minute flight deals from Ontario to Fremont. Data last updated June 9, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Fremont. Data last updated June 9, 2026 and is based on user searches.
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.
Thu 6/258:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Tue 6/3011:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 6/6![Frontier logo]()
$104
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 6/298:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Tue 6/3011:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 6/5![Frontier logo]()
$105
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/18:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Tue 7/74:30 pm
SFO
- ONT
1 stop15h 33m
Frontier
Deal found 6/4![Frontier logo]()
$121
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 7/48:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Sat 8/89:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 6/5![Frontier logo]()
$118
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 7/98:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Tue 7/1411:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Deal found 6/5![Frontier logo]()
$117
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.
Fri 7/178:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Tue 7/2111:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Deal found 6/6![Frontier logo]()
$116
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.
Mon 7/208:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Thu 7/309:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/7![Frontier logo]()
$107
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.
Tue 7/218:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Sat 8/19:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/7![Frontier logo]()
$123
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 7/228:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Sat 7/259:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/6![Frontier logo]()
$124
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 7/238:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Mon 7/279:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/7![Frontier logo]()
$126
One-way flights from Ontario to FremontSearch for one-way flight options from Ontario to Fremont. Find affordable one-way fares based on user searches. Data last updated June 9, 2026.
Search for one-way flight options from Ontario to Fremont. Find affordable one-way fares based on user searches. Data last updated June 9, 2026.
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.
Mon 11/211:38 am
ONT
- SFO
Nonstop1h 34m
Frontier
Deal found 6/8![Frontier logo]()
$62
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 7/208:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 6/4![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.
Mon 6/298:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 6/7![Frontier logo]()
$64
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 6/228:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 6/5![Frontier logo]()
$65
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 8/248:33 pm
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 6/5![Frontier logo]()
$66
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/188:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 6/7![Frontier logo]()
$69
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 6/308:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 6/9![Frontier logo]()
$73
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 7/118:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 6/5![Frontier logo]()
$74
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/88:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/9![Frontier logo]()
$75
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/111:38 am
ONT
- SFO
Nonstop1h 34m
Frontier
Deal found 6/9![Frontier logo]()
$76
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.
Thu 7/98:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 6/9![Frontier logo]()
$78
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 7/16:35 pm
ONT
- SFO
1 stop4h 40m
Southwest
Deal found 6/5![Southwest logo]()
$79
Find flight deals from Ontario to Fremont
Keep the following information in mind while searching for Ontario to Fremont flight deals. Data was last updated June 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $104 (Super.com) |
One-way from | $62 (Frontier) |
Popular in | February |
Cheapest in | August |
Average price | $162 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Fremont 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 Ontario to Fremont that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Tue 7/7
4:35 pm-10:35 pm
2 stops6h 00m
San Francisco
Sat 7/11
5:00 am-1:40 pm
2 stops8h 40m
$217
Quickest round-trip
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 8/5
6:00 am-7:25 am
Nonstop1h 25m
San Francisco
Wed 8/5
10:40 am-12:12 pm
Nonstop1h 32m
$226
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Sat 10/10
8:00 am-9:27 am
Nonstop1h 27m
San Francisco
Tue 10/13
1:40 pm-3:11 pm
Nonstop1h 31m
$229
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Sat 7/11
6:30 pm-12:35 am
1 stop6h 05m
San Francisco
Mon 7/13
6:45 pm-12:10 am
1 stop5h 25m
$257
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 10/7
8:00 am-9:27 am
Nonstop1h 27m
San Francisco
Thu 10/8
8:40 am-10:23 am
Nonstop1h 43m
$270
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Thu 7/2
5:15 pm-12:30 am
2 stops7h 15m
San Francisco
Mon 7/6
3:45 pm-12:10 am
2 stops8h 25m
$278
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 7/15
1:50 pm-3:15 pm
Nonstop1h 25m
San Francisco
Mon 7/20
10:40 am-12:12 pm
Nonstop1h 32m
$302
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Thu 7/23
5:15 am-1:00 pm
2 stops7h 45m
San Francisco
Fri 7/24
5:00 am-11:20 am
2 stops6h 20m
$309
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Thu 10/29
6:00 am-7:29 am
Nonstop1h 29m
San Francisco
Sat 10/31
10:50 am-12:20 pm
Nonstop1h 30m
$309
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Thu 7/23
1:50 pm-3:15 pm
Nonstop1h 25m
San Francisco
Sat 7/25
10:40 am-12:12 pm
Nonstop1h 32m
$315
Showing 1-10 of 23 resultsSorted by cheapest first
Best time to book a flight from Ontario to Fremont
Have a flexible travel schedule? Discover the best time to fly to Fremont from Ontario with our price prediction graph.
ONT-SFO
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 Fremont
ONT-FR8
ONT-SFO
What is the cheapest time of day to fly from ONT to FR8?
Find hourly flight availability from Ontario to Fremont. 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.
When flying from Ontario to Fremont, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 25% versus a flight in the morning.
Weekly flight availability from Ontario to Fremont
Explore weekly flight availability from Ontario to Fremont. 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 ONT to FR8 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 (5 on average).
How much does it cost to fly round-trip from Ontario to Fremont?
What is the cheapest day to fly from Ontario to Fremont?
Use this chart to determine the cheapest time to fly round-trip from Ontario to Fremont. Price data was last updated on May 30, 2026.
Travelers seeking maximum savings on their Ontario to Fremont flight should consider departing on Saturday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Fremont
Get insights into the airlines that provide service to Fremont. 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 Fremont. Reviews last updated June 9, 2026.
Get a feel of what it's like to fly with Alaska Airlines,Southwest, andUnited Airlines from Ontario to Fremont by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.5
Food
7.1
Comfort
7.8
Entertainment
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Food
7.1
Comfort
7.8
Entertainment
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Food
7.1
Comfort
7.8
Entertainment
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Food
7.1
Comfort
7.8
Entertainment
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Food
7.1
Comfort
7.8
Entertainment
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Food
7.1
Comfort
7.8
Entertainment
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Related info for your journey
Find useful and relevant information for your journey from Ontario to Fremont. 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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Ontario and Fremont flights
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Top 5 airlines flying from Ontario to Fremont
Discover the top 5 airlines that operate flights from Ontario to Fremont. 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$29 | Average$118 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$78 | Average$157 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$79 | Average$179 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$124 | Average$314 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$153 | Average$169 | FlexibilityNo cancel fee | On-time62% |