Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Ontario to San Francisco from $66

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to San Francisco departing on 7/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Ontario to San Francisco

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:39 pm - 10:09 pm
ONT
-
SFO
1h 30mnonstop
Frontier Logo
11:10 am - 12:43 pm
SFO
-
ONT
1h 33mnonstop
$106Frontier
Tue, Jul 28 - Tue, Aug 4
Frontier Logo
8:36 pm - 10:13 pm
ONT
-
SFO
1h 37mnonstop
Frontier Logo
11:13 am - 12:48 pm
SFO
-
ONT
1h 35mnonstop
$107Frontier
Mon, Jun 22 - Tue, Jun 30
Frontier Logo
8:36 pm - 10:13 pm
ONT
-
SFO
1h 37mnonstop
Frontier Logo
9:41 am - 11:13 am
SFO
-
ONT
1h 32mnonstop
$108Frontier
Thu, Jun 11 - Mon, Jun 15
Frontier Logo
8:36 pm - 10:13 pm
ONT
-
SFO
1h 37mnonstop
Frontier Logo
9:41 am - 11:13 am
SFO
-
ONT
1h 32mnonstop
$109Frontier
Tue, Jun 23 - Mon, Jun 29
Frontier Logo
8:36 pm - 10:13 pm
ONT
-
SFO
1h 37mnonstop
Frontier Logo
11:10 am - 12:43 pm
SFO
-
ONT
1h 33mnonstop
$110Frontier
Wed, Jul 1 - Tue, Jul 7
Frontier Logo
8:59 am - 10:38 am
ONT
-
SFO
1h 39mnonstop
Frontier Logo
11:15 am - 12:54 pm
SFO
-
ONT
1h 39mnonstop
$112Frontier
Sun, May 31 - Wed, Jun 3
Frontier Logo
8:17 pm - 9:55 pm
ONT
-
SFO
1h 38mnonstop
Frontier Logo
9:34 am - 11:06 am
SFO
-
ONT
1h 32mnonstop
$113Frontier
Wed, Jun 3 - Sat, Jun 6
Frontier Logo
8:59 am - 10:38 am
ONT
-
SFO
1h 39mnonstop
Frontier Logo
11:15 am - 12:54 pm
SFO
-
ONT
1h 39mnonstop
$114Frontier
Sat, May 30 - Tue, Jun 2
Frontier Logo
8:17 pm - 9:55 pm
ONT
-
SFO
1h 38mnonstop
Frontier Logo
8:41 pm - 3:08 pm
SFO
-
ONT
18h 27m
1 stop
$115Frontier
Wed, Jun 3 - Mon, Jun 8
Frontier Logo
8:36 pm - 10:13 pm
ONT
-
SFO
1h 37mnonstop
Frontier Logo
11:13 am - 12:48 pm
SFO
-
ONT
1h 35mnonstop
$116Frontier
Tue, Jun 9 - Tue, Jun 16

Frontier flights from Ontario to San Francisco

Our best Frontier deals on Ontario to San Francisco flight tickets
Frontier
Aug 25
ONT8:33 pmOntario
1h 32m
SFO10:05 pmSan Francisco
Aug 29
SFO9:31 amSan Francisco
1h 27m
ONT10:58 amOntario
$106
Frontier
Jun 22
ONT8:36 pmOntario
1h 37m
SFO10:13 pmSan Francisco
Jun 30
SFO11:13 amSan Francisco
1h 35m
ONT12:48 pmOntario
$107
Frontier
Jun 11
ONT8:36 pmOntario
1h 37m
SFO10:13 pmSan Francisco
Jun 15
SFO9:41 amSan Francisco
1h 32m
ONT11:13 amOntario
$108

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to San Francisco 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, momondo users made 832,500 searches. Data last updated May 14, 2026.
Use the filters below to find and compare flights from Ontario to San Francisco that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 7/28

8:39 pm-10:09 pm

Nonstop1h 30m

San Francisco

Tue 8/4

11:10 am-12:43 pm

Nonstop1h 33m

$106

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Mon 6/22

8:36 pm-10:13 pm

Nonstop1h 37m

San Francisco

Tue 6/30

11:13 am-12:48 pm

Nonstop1h 35m

$107

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Thu 6/11

8:36 pm-10:13 pm

Nonstop1h 37m

San Francisco

Mon 6/15

9:41 am-11:13 am

Nonstop1h 32m

$108

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 6/23

8:36 pm-10:13 pm

Nonstop1h 37m

San Francisco

Mon 6/29

9:41 am-11:13 am

Nonstop1h 32m

$109

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 7/1

8:36 pm-10:13 pm

Nonstop1h 37m

San Francisco

Tue 7/7

11:10 am-12:43 pm

Nonstop1h 33m

$110

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Sun 5/31

8:59 am-10:38 am

Nonstop1h 39m

San Francisco

Wed 6/3

11:15 am-12:54 pm

Nonstop1h 39m

$112

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 6/3

8:17 pm-9:55 pm

Nonstop1h 38m

San Francisco

Sat 6/6

9:34 am-11:06 am

Nonstop1h 32m

$113

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Sat 5/30

8:59 am-10:38 am

Nonstop1h 39m

San Francisco

Tue 6/2

11:15 am-12:54 pm

Nonstop1h 39m

$114

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Wed 6/3

8:17 pm-9:55 pm

Nonstop1h 38m

San Francisco

Mon 6/8

8:41 pm-3:08 pm

1 stop18h 27m

$115

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Tue 6/9

8:36 pm-10:13 pm

Nonstop1h 37m

San Francisco

Tue 6/16

11:13 am-12:48 pm

Nonstop1h 35m

$116

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to San Francisco from

How to get the cheapest flight ticket from Ontario to San Francisco

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Ontario and San Francisco?

What is the cheapest month to fly to San Francisco?

If you aren’t able to travel to San Francisco during the month of August, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $141.

What is the cheapest day to depart on your flight to San Francisco?

The cheapest day to depart from Ontario to San Francisco is on a Friday when prices can be found for as low as $217. The most expensive day to fly to San Francisco is Monday, with ticket prices averaging around $344.

What is the cheapest time of day to depart on your flight to San Francisco?

Our data shows that the cheapest Ontario to San Francisco flights are usually those with departure times in the afternoon. Our users have found flights to San Francisco in the afternoon for as low as $190. Flights at noon are often more expensive with an average ticket price of $296.

What is the cheapest Ontario to San Francisco flight route?

Fly from Ontario to San Francisco for the best Ontario - San Francisco flight prices

How far in advance should I book a flight from Ontario to San Francisco?

You are more likely to see cheaper flights to San Francisco from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around $199 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from Ontario for as low as $142 on momondo.

How have Ontario to San Francisco flight prices changed over time?

As of May 2026, prices for Ontario to San Francisco flights are approximately 74% more expensive when compared to flights at the same time last year.

When to book flights from Ontario to San Francisco

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to San Francisco according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to San Francisco (ONT to SFO) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to San Francisco

Best Price Found

$85

Fastest flight time

1h 25m

Direct flights

Every day

Airports in San Francisco

1 airport
The best one-way flight to San Francisco from Ontario in the past 72 hours is $85. The best round-trip flight deal from Ontario to San Francisco found on momondo in the last 72 hours is $171.
The fastest flight from Ontario to San Francisco takes 1h 25m
Direct flights go from Ontario to San Francisco every day.
There is 1 airport in San Francisco. From Ontario there are direct flights to San Francisco (SFO).
Search flight deals

Frequently asked questions about flying from Ontario to San Francisco

  • How far is Ontario to San Francisco by plane?

    The straight-line distance from Ontario to San Francisco is 369.2 mi. In terms of flight time, this usually takes a little over 1h 25m.

  • When did momondo last update prices for flights from Ontario Airport to San Francisco Airport?

    Prices for flights from Ontario Airport to San Francisco Airport are updated daily.

  • How many operators does momondo search for flights from Ontario Airport to San Francisco Airport?

  • How old do you have to be to fly from Ontario Airport to San Francisco Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to San Francisco Airport.

  • What documentation or ID do you need to fly to San Francisco Airport?

    The necessary travel and health documents for your San Francisco Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Ontario to San Francisco?

  • What is the most popular airline from Ontario to San Francisco?

Best airlines flying from Ontario to San Francisco

Compare and see reviews for airlines that fly from Ontario to San Francisco with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $38Free CancellationRating
5.6
2,953 reviews
Search Frontier flights
United AirlinesPriceFrom $77Free CancellationRating
7.4
9,711 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $78Free CancellationRating
7.9
12,363 reviews
Search Alaska Airlines flights
JetBluePriceFrom $153Free CancellationRating
7.1
2,975 reviews
Search JetBlue flights
SouthwestPriceFrom $226Free CancellationRating
8.0
4,299 reviews
Search Southwest flights

  • United Airlines Flights From Ontario to San Francisco

    United Airlines flight deals from Ontario to San Francisco start from $77 round-trip. Over the 18 United Airlines flights for this route in a normal week, average airfare is usually $213 round-trip - but some users have found much cheaper deals with momondo.

  • Frontier Flights From Ontario to San Francisco

    Across 2,953 Frontier reviews on momondo, the average score is 5.6/10. Frontier flies from Ontario to San Francisco about 4 times each week, with ticket deals ranging from $38 to $129. Price data is based on momondo searches in the last 72 hours.

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Santa Cruz
Carmel-by-the-Sea
Modesto
Sonoma
Walnut Creek
Bodega Bay
Hayward
Roseville
Santa Clara
Berkeley
Fremont
Vallejo
Big Sur
Sunnyvale
Calistoga
South San Francisco
Salinas
Daly City
Milpitas
Pacific Grove

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to San Francisco?

It is quick and easy to find Ontario to San Francisco flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to San Francisco that suits you.

Can I find flights from Ontario to San Francisco with flexible booking policies on momondo?

Flights from Ontario to San Francisco with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Ontario to San Francisco?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to San Francisco.

I’m not ready to book a flight from Ontario to San Francisco right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to San Francisco from Ontario. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your San Francisco trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 6/13
Sat 6/20
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States