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Cheap flights from San Francisco to Los Angeles from $39

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from San Francisco to Los Angeles departing on 12/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

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Frontier Logo
10:21 pm - 11:50 pmSFO-ONT
1h 29mnonstop
Frontier Logo
10:42 pm - 12:11 amONT-SFO
1h 29mnonstop
$78Frontier
Find Deal
Mon, Nov 10 - Mon, Nov 17
Frontier Logo
10:21 pm - 11:50 pmSFO-ONT
1h 29mnonstop
Frontier Logo
10:50 pm - 12:19 amONT-SFO
1h 29mnonstop
$80Frontier
Find Deal
Mon, Nov 3 - Sun, Nov 9
Frontier Logo
10:03 pm - 11:31 pmSFO-ONT
1h 28mnonstop
Frontier Logo
9:59 pm - 11:34 pmONT-SFO
1h 35mnonstop
$81Frontier
Find Deal
Fri, Dec 5 - Mon, Dec 8
Frontier Logo
10:21 pm - 11:50 pmSFO-ONT
1h 29mnonstop
Frontier Logo
10:50 pm - 12:19 amONT-SFO
1h 29mnonstop
$86Frontier
Find Deal
Mon, Nov 3 - Sun, Nov 9
Frontier Logo
10:21 pm - 11:50 pmSFO-ONT
1h 29mnonstop
Frontier Logo
10:42 pm - 12:11 amONT-SFO
1h 29mnonstop
$87Frontier
Find Deal
Fri, Nov 14 - Mon, Nov 17
Frontier Logo
10:03 pm - 11:31 pmSFO-ONT
1h 28mnonstop
Frontier Logo
6:30 am - 9:08 pmONT-SFO
14h 38m1 stop
$89Frontier
Find Deal
Thu, Dec 11 - Wed, Dec 17
Frontier Logo
10:21 pm - 11:50 pmSFO-ONT
1h 29mnonstop
Frontier Logo
10:42 pm - 12:11 amONT-SFO
1h 29mnonstop
$90Frontier
Find Deal
Mon, Nov 3 - Thu, Nov 6
Frontier Logo
4:14 pm - 9:57 pmSFO-ONT
5h 43m1 stop
Frontier Logo
10:42 pm - 12:11 amONT-SFO
1h 29mnonstop
$93Frontier
Find Deal
Mon, Nov 3 - Mon, Nov 10
Frontier Logo
6:39 pm - 7:17 amSFO-ONT
12h 38m1 stop
Frontier Logo
10:42 pm - 12:11 amONT-SFO
1h 29mnonstop
$94Frontier
Find Deal
Sat, Nov 15 - Mon, Nov 17
United Airlines Logo
11:15 am - 12:37 pmSFO-ONT
1h 22mnonstop
United Airlines Logo
6:38 pm - 8:02 pmONT-SFO
1h 24mnonstop
$137United Airlines
Find Deal
Tue, Nov 4 - Tue, Nov 4

Frontier flights from San Francisco to Ontario

Our best Frontier deals on San Francisco to Ontario flight tickets
Frontier
Nov 10
SFO10:21 pmSan Francisco
1h 29m
ONT11:50 pmOntario
Nov 17
ONT10:42 pmOntario
1h 29m
SFO12:11 amSan Francisco
$78
Find similar
Frontier
Nov 3
SFO10:21 pmSan Francisco
1h 29m
ONT11:50 pmOntario
Nov 9
ONT10:50 pmOntario
1h 29m
SFO12:19 amSan Francisco
$80
Find similar
Frontier
Dec 5
SFO10:03 pmSan Francisco
1h 28m
ONT11:31 pmOntario
Dec 8
ONT9:59 pmOntario
1h 35m
SFO11:34 pmSan Francisco
$81
Find similar

United Airlines flights from San Francisco to Ontario

Our best United Airlines deals on San Francisco to Ontario flight tickets
United Airlines
Nov 4
SFO11:15 amSan Francisco
1h 22m
ONT12:37 pmOntario
Nov 4
ONT6:38 pmOntario
1h 24m
SFO8:02 pmSan Francisco
$137
Find similar
United Airlines
Oct 24
SFO9:30 pmSan Francisco
1h 22m
ONT10:52 pmOntario
Oct 26
ONT6:00 amOntario
1h 22m
SFO7:22 amSan Francisco
$148
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from San Francisco 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, momondo users made 832,500 searches. Data last updated October 14, 2025.
Use the filters below to find and compare flights from San Francisco to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 11/10

10:21 pm-11:50 pm

Nonstop1h 29m

Ontario

Mon 11/17

10:42 pm-12:11 am

Nonstop1h 29m

$78

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 11/3

10:21 pm-11:50 pm

Nonstop1h 29m

Ontario

Sun 11/9

10:50 pm-12:19 am

Nonstop1h 29m

$80

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Fri 12/5

10:03 pm-11:31 pm

Nonstop1h 28m

Ontario

Mon 12/8

9:59 pm-11:34 pm

Nonstop1h 35m

$81

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 11/3

10:21 pm-11:50 pm

Nonstop1h 29m

Ontario

Sun 11/9

10:50 pm-12:19 am

Nonstop1h 29m

$86

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Fri 11/14

10:21 pm-11:50 pm

Nonstop1h 29m

Ontario

Mon 11/17

10:42 pm-12:11 am

Nonstop1h 29m

$87

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Thu 12/11

10:03 pm-11:31 pm

Nonstop1h 28m

Ontario

Wed 12/17

6:30 am-9:08 pm

1 stop14h 38m

$89

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 11/3

10:21 pm-11:50 pm

Nonstop1h 29m

Ontario

Thu 11/6

10:42 pm-12:11 am

Nonstop1h 29m

$90

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Mon 11/3

4:14 pm-9:57 pm

1 stop5h 43m

Ontario

Mon 11/10

10:42 pm-12:11 am

Nonstop1h 29m

$93

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Sat 11/15

6:39 pm-7:17 am

1 stop12h 38m

Ontario

Mon 11/17

10:42 pm-12:11 am

Nonstop1h 29m

$94

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Tue 11/4

11:15 am-12:37 pm

Nonstop1h 22m

Ontario

Tue 11/4

6:38 pm-8:02 pm

Nonstop1h 24m

$137

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from San Francisco to Ontario

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 cheapest month to fly to Ontario?

In general, February is the cheapest month to fly from San Francisco to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $104. If you aren’t able to travel during the month of February, then book flights to Ontario from San Francisco during January instead. Flights to Ontario in January, while not as cheap as those in February, still average around $117.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Monday when prices can be found for as low as $113. This is often the case because there is less demand to fly during this day of the week. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from San Francisco to Ontario for around $176.

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

In the evening is the cheapest time of day to fly from San Francisco to Ontario when you can find flight prices for as low as $116. Flying to Ontario in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $185 on average. Flights to Ontario from San Francisco in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest San Francisco to Ontario flight route?

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

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

You are more likely to see cheaper flights to Ontario from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $154 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from San Francisco for as low as $116 on momondo.

What cabin class options are available on San Francisco to Ontario flights?

There are 4 cabin classes available to choose from on San Francisco to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

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

As of October 2025, prices for San Francisco to Ontario flights are approximately 14% cheaper when compared to flights at the same time last year.

When to book flights from San Francisco to Ontario

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

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

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

Best Price Found

$58

Fastest flight time

1h 21m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from San Francisco in the past 72 hours is $58. The best round-trip flight deal from San Francisco to Ontario found on momondo in the last 72 hours is $109.
The fastest flight from San Francisco to Ontario takes 1h 21m
Direct flights go from San Francisco to Ontario every day.
There is 1 airport near Ontario: Ontario (ONT)
Search flight deals

  • How far is San Francisco to Ontario by plane?

    There are 370.2 mi between San Francisco and Ontario. By plane, this route typically takes 1h 22m.

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

    Prices for flights from San Francisco Airport to Ontario Airport were last updated today.

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from San Francisco Airport to Ontario Airport.

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

    The necessary travel and health documents for your Ontario 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 San Francisco to Ontario?

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

Best airlines flying from San Francisco to Ontario

Compare and see reviews for airlines that fly from San Francisco to Ontario with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $39Free CancellationRating
5.8
3,137 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $42Free CancellationRating
6.3
8,096 reviews
Search Spirit Airlines flights
United AirlinesPriceFrom $58Free CancellationRating
7.4
8,976 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $59Free CancellationRating
8.0
11,080 reviews
Search Alaska Airlines flights
DeltaPriceFrom $108Free CancellationRating
7.9
7,972 reviews
Search Delta flights
American AirlinesPriceFrom $186Free CancellationRating
7.2
11,042 reviews
Search American Airlines flights

  • United Airlines Flights From San Francisco to Ontario

    The lowest priced United Airlines flight from San Francisco to Ontario from the last 72 hours was $58. Generally, United Airlines has 21 flights on this route every week with an average price of $215. United Airlines is rated 7.4/10 by our users.

  • Frontier Flights From San Francisco to Ontario

    $39 is the best Frontier flight deal from San Francisco to Ontario found on momondo over the last 72 hours. The average Frontier ticket price found was closer to $114, however, with flight time and availability significantly affecting the price. Frontier (5.8/10 from 3,135 user reviews) flies into Ontario from San Francisco 2 times in an average week so prices can vary.

Why use momondo?

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

It is quick and easy to find San Francisco to Ontario 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 Ontario that suits you.

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

Yes. All flights to Ontario from San Francisco on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once all potential San Francisco to Ontario flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Of course. momondo tracks the price of San Francisco to Ontario flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Ontario trip

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