$37+ 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 7/22. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SFO
Jul 28 — Aug 41
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 October or August, booked 56 days in advance, depart on a Friday or Thursday and return on a Monday
Cheap flight deals from Ontario to Fremont
Cheapest
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 28, 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 28, 2026.
This Frontier deal was found by Cheapflights users on 6/27. 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 9/58:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 9/79:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 6/27![Frontier logo]()
$97
This Super.com deal was found by Cheapflights users on 6/26. 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 9/242:26 pm
ONT
- SFO
Nonstop1h 30m
Frontier
Mon 9/2812:31 pm
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 6/26![Frontier logo]()
$105
This Frontier deal was found by Cheapflights users on 6/25. 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 8/179:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 6/25![Frontier logo]()
$107
This United Airlines deal was found by Cheapflights users on 6/26. 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 7/251:50 pm
ONT
- SFO
Nonstop1h 25m
United Airlines
Wed 7/299:00 pm
SFO
- ONT
Nonstop1h 37m
United Airlines
Deal found 6/26![United Airlines logo]()
$117
This Super.com deal was found by Cheapflights users on 6/26. 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 7/288:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Tue 8/411:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Deal found 6/26![Frontier logo]()
$126
This Super.com deal was found by Cheapflights users on 6/24. 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 8/183:13 pm
ONT
- SFO
Nonstop1h 27m
Frontier
Wed 8/1911:20 am
SFO
- ONT
1 stop4h 34m
Frontier
Deal found 6/24![Frontier logo]()
$131
This Expedia deal was found by Cheapflights users on 6/24. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/46:00 am
ONT
- SFO
1 stop18h 23m
Frontier
Tue 8/1111:15 am
SFO
- ONT
Nonstop1h 33m
Frontier
Deal found 6/24![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 7/168:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Sat 7/189:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/24![Frontier logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 6/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/258:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Sun 7/269:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/25![Frontier logo]()
$135
This Super.com deal was found by Cheapflights users on 6/25. 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 7/298:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Thu 7/309:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/25![Frontier logo]()
$136
This Frontier deal was found by Cheapflights users on 6/27. 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 7/188:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Tue 7/2111:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Deal found 6/27![Frontier logo]()
$137
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 28, 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 28, 2026.
This United Airlines deal was found by Cheapflights users on 6/27. 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 8/11:50 pm
ONT
- SFO
Nonstop1h 25m
United Airlines
Tue 8/410:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 6/27![United Airlines logo]()
$117
This Southwest deal was found by Cheapflights users on 6/24. 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 7/224:35 pm
ONT
- SFO
1 stop6h 55m
Southwest
Sat 7/253:15 pm
SFO
- ONT
2 stops7h 40m
Southwest
Deal found 6/24![Southwest logo]()
$245
This United Airlines deal was found by Cheapflights users on 6/23. 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 9/298:03 am
ONT
- SFO
Nonstop1h 27m
United Airlines
Wed 10/79:25 pm
SFO
- ONT
Nonstop1h 34m
United Airlines
Deal found 6/23![United Airlines logo]()
$187
This United Airlines deal was found by Cheapflights users on 6/23. 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 9/301:52 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Wed 10/79:25 pm
SFO
- ONT
Nonstop1h 34m
United Airlines
Deal found 6/23![United Airlines logo]()
$187
This United Airlines deal was found by Cheapflights users on 6/23. 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 9/301:52 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Tue 10/61:40 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 6/23![United Airlines logo]()
$187
This Southwest deal was found by Cheapflights users on 6/27. 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 7/255:30 am
ONT
- SFO
2 stops9h 40m
Southwest
Wed 7/295:00 am
SFO
- ONT
1 stop4h 15m
Southwest
Deal found 6/27![Southwest logo]()
$269
This United Airlines deal was found by Cheapflights users on 6/25. 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 10/71:52 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Thu 10/89:25 pm
SFO
- ONT
Nonstop1h 34m
United Airlines
Deal found 6/25![United Airlines logo]()
$219
This Southwest deal was found by Cheapflights users on 6/24. 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 8/82:55 pm
ONT
- SFO
1 stop5h 40m
Southwest
Mon 8/105:10 am
SFO
- ONT
2 stops8h 15m
Southwest
Deal found 6/24![Southwest logo]()
$275
This Southwest deal was found by Cheapflights users on 6/23. 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 8/2210:15 am
ONT
- SFO
2 stops8h 05m
Southwest
Mon 8/247:00 am
SFO
- ONT
2 stops8h 15m
Southwest
Deal found 6/23![Southwest logo]()
$292
This United Airlines deal was found by Cheapflights users on 6/26. 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 8/131:56 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Mon 8/174:40 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 6/26![United Airlines logo]()
$251
This United Airlines deal was found by Cheapflights users on 6/27. 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.
Fri 9/256:00 am
ONT
- SFO
Nonstop1h 27m
United Airlines
Sat 9/269:25 pm
SFO
- ONT
Nonstop1h 34m
United Airlines
Deal found 6/27![United Airlines logo]()
$283
Last-minute flights from Ontario to FremontDiscover last-minute flight deals from Ontario to Fremont. Data last updated June 28, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Fremont. Data last updated June 28, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 6/24. 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 7/143:40 pm
ONT
- SFO
1 stop4h 12m
Frontier
Tue 7/2111:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Deal found 6/24![Frontier logo]()
$142
This Super.com deal was found by Cheapflights users on 6/24. 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 7/158:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Sun 7/199:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/24![Frontier logo]()
$136
This Super.com deal was found by Cheapflights users on 6/24. 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 7/158:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Wed 7/159:00 pm
SFO
- ONT
1 stop11h 03m
Frontier
Deal found 6/24![Frontier logo]()
$148
This Frontier deal was found by Cheapflights users on 6/23. 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.
Fri 7/178:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Tue 7/2111:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Deal found 6/23![Frontier logo]()
$138
This Kiwi.com deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/188:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Sun 7/199:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/23![Frontier logo]()
$134
This Frontier deal was found by Cheapflights users on 6/27. 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 7/188:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Tue 7/2111:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Deal found 6/27![Frontier logo]()
$137
This Frontier deal was found by Cheapflights users on 6/24. 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 7/211:38 pm
ONT
- SFO
1 stop6h 14m
Frontier
Sat 7/259:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/24![Frontier logo]()
$143
This Kiwi.com deal was found by Cheapflights users on 6/27. 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 7/228:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Thu 7/239:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/27![Frontier logo]()
$144
This United Airlines deal was found by Cheapflights users on 6/26. 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 7/251:50 pm
ONT
- SFO
Nonstop1h 25m
United Airlines
Wed 7/299:00 pm
SFO
- ONT
Nonstop1h 37m
United Airlines
Deal found 6/26![United Airlines logo]()
$117
This Kiwi.com deal was found by Cheapflights users on 6/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/258:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Sun 7/269:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/25![Frontier logo]()
$135
This Super.com deal was found by Cheapflights users on 6/26. 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 7/288:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Tue 8/411:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Deal found 6/26![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 28, 2026.
Search for one-way flight options from Ontario to Fremont. Find affordable one-way fares based on user searches. Data last updated June 28, 2026.
This Frontier deal was found by Cheapflights users on 6/27. 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
Deal found 6/27![Frontier logo]()
$37
This Frontier deal was found by Cheapflights users on 6/27. 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 9/58:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/27![Frontier logo]()
$43
This Kiwi.com deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/248:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/23![Frontier logo]()
$45
This Frontier deal was found by Cheapflights users on 6/24. 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 9/38:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/24![Frontier logo]()
$46
This Gotogate deal was found by Cheapflights users on 6/27. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/178:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/27![Frontier logo]()
$47
This Jetabroad deal was found by Cheapflights users on 6/25. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/318:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/25![Frontier logo]()
$50
This United Airlines deal was found by Cheapflights users on 6/26. 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 7/251:50 pm
ONT
- SFO
Nonstop1h 25m
United Airlines
Deal found 6/26![United Airlines logo]()
$59
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 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $97 (Frontier) |
One-way from | $37 (Frontier) |
Popular in | February |
Cheapest in | October |
Average price | $215 |
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 28, 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
Quickest round-trip
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Sat 8/1
1:50 pm-3:15 pm
Nonstop1h 25m
San Francisco
Tue 8/4
10:40 am-12:12 pm
Nonstop1h 32m
$117
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Tue 9/29
8:03 am-9:30 am
Nonstop1h 27m
San Francisco
Wed 10/7
9:25 pm-10:59 pm
Nonstop1h 34m
$187
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 9/30
1:52 pm-3:21 pm
Nonstop1h 29m
San Francisco
Wed 10/7
9:25 pm-10:59 pm
Nonstop1h 34m
$187
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 9/30
1:52 pm-3:21 pm
Nonstop1h 29m
San Francisco
Tue 10/6
1:40 pm-3:11 pm
Nonstop1h 31m
$187
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 10/7
1:52 pm-3:21 pm
Nonstop1h 29m
San Francisco
Thu 10/8
9:25 pm-10:59 pm
Nonstop1h 34m
$219
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 7/22
4:35 pm-11:30 pm
1 stop6h 55m
San Francisco
Sat 7/25
3:15 pm-10:55 pm
2 stops7h 40m
$245
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Thu 8/13
1:56 pm-3:25 pm
Nonstop1h 29m
San Francisco
Mon 8/17
4:40 pm-6:11 pm
Nonstop1h 31m
$251
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Sat 7/25
5:30 am-3:10 pm
2 stops9h 40m
San Francisco
Wed 7/29
5:00 am-9:15 am
1 stop4h 15m
$269
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Sat 8/8
2:55 pm-8:35 pm
1 stop5h 40m
San Francisco
Mon 8/10
5:10 am-1:25 pm
2 stops8h 15m
$275
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Fri 9/25
6:00 am-7:27 am
Nonstop1h 27m
San Francisco
Sat 9/26
9:25 pm-10:59 pm
Nonstop1h 34m
$283
Showing 1-10 of 22 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 28, 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 24% 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 28, 2026.
The most flights from ONT to FR8 are scheduled on a Friday (10 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (6 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 June 20, 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 28, 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.
Boarding
8.1
Crew
8.5
Food
7.0
Overall
7.9
Comfort
7.8
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Crew
8.5
Food
7.0
Overall
7.9
Comfort
7.8
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Crew
8.5
Food
7.0
Overall
7.9
Comfort
7.8
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Crew
8.5
Food
7.0
Overall
7.9
Comfort
7.8
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Crew
8.5
Food
7.0
Overall
7.9
Comfort
7.8
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Crew
8.5
Food
7.0
Overall
7.9
Comfort
7.8
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
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
Browse other Ontario and Fremont flight options. Last updated on June 28, 2026.
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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 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$119 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$78 | Average$167 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$91 | Average$183 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$125 | Average$319 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$153 | Average$188 | FlexibilityNo cancel fee | On-time62% |