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Cheap flights from Ontario to San Francisco from $89

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 1/28. 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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0 bags

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Find the cheapest flights from Ontario to San Francisco

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
5:50 pm - 7:15 pm
ONT
-
OAK
1h 25mnonstop
Southwest Logo
2:45 pm - 4:05 pm
OAK
-
ONT
1h 20mnonstop
$177Southwest
Tue, Jan 27 - Tue, Feb 3
Southwest Logo
5:50 pm - 7:15 pm
ONT
-
OAK
1h 25mnonstop
Southwest Logo
10:30 am - 1:50 pm
OAK
-
ONT
3h 20m1 stop
$183Southwest
Tue, Jan 27 - Tue, Feb 3
Southwest Logo
3:20 pm - 4:45 pm
ONT
-
OAK
1h 25mnonstop
Southwest Logo
10:20 am - 4:25 pm
OAK
-
ONT
6h 05m2 stops
$192Southwest
Tue, Jan 27 - Tue, Feb 3
Southwest Logo
6:35 am - 8:00 am
ONT
-
OAK
1h 25mnonstop
Southwest Logo
2:45 pm - 4:05 pm
OAK
-
ONT
1h 20mnonstop
$196Southwest
Sat, Jan 17 - Tue, Jan 20
Southwest Logo
3:25 pm - 9:45 pm
ONT
-
OAK
6h 20m2 stops
Southwest Logo
10:30 am - 1:50 pm
OAK
-
ONT
3h 20m1 stop
$198Southwest
Tue, Jan 27 - Tue, Feb 3
Southwest Logo
9:00 am - 3:05 pm
ONT
-
OAK
6h 05m1 stop
Southwest Logo
6:10 pm - 7:30 pm
OAK
-
ONT
1h 20mnonstop
$206Southwest
Sat, Jan 17 - Tue, Jan 20
Southwest Logo
8:30 am - 2:50 pm
ONT
-
OAK
6h 20m2 stops
Southwest Logo
7:25 am - 1:50 pm
OAK
-
ONT
6h 25m2 stops
$207Southwest
Tue, Jan 27 - Tue, Feb 3
Southwest Logo
5:50 am - 1:25 pm
ONT
-
OAK
7h 35m2 stops
Southwest Logo
6:10 pm - 7:30 pm
OAK
-
ONT
1h 20mnonstop
$211Southwest
Sat, Jan 17 - Tue, Jan 20
Southwest Logo
3:20 pm - 4:45 pm
ONT
-
OAK
1h 25mnonstop
Southwest Logo
1:00 pm - 2:20 pm
OAK
-
ONT
1h 20mnonstop
$215Southwest
Tue, Jan 20 - Thu, Jan 22
Southwest Logo
7:20 am - 8:45 am
ONT
-
OAK
1h 25mnonstop
Southwest Logo
9:00 pm - 10:20 pm
OAK
-
ONT
1h 20mnonstop
$218Southwest
Tue, Feb 24 - Sun, Mar 1

Southwest flights from Ontario to Oakland, California

Our best Southwest deals on Ontario to Oakland, California flight tickets
Southwest
Jan 27
ONT5:50 pmOntario
1h 25m
OAK7:15 pmOakland
Feb 3
OAK2:45 pmOakland
1h 20m
ONT4:05 pmOntario
$177
Find similar
Southwest
Jan 27
ONT5:50 pmOntario
1h 25m
OAK7:15 pmOakland
Feb 3
OAK10:30 amOakland
3h 20m
1 stop
ONT1:50 pmOntario
$183
Find similar
Southwest
Jan 27
ONT3:20 pmOntario
1h 25m
OAK4:45 pmOakland
Feb 3
OAK10:20 amOakland
6h 05m
2 stops
ONT4:25 pmOntario
$192
Find similar

Delta flights from Ontario to Oakland, California

Our best Delta deals on Ontario to Oakland, California flight tickets
Delta
Mar 10
ONT6:00 amOntario
29h 51m
2 stops
OAK11:51 amOakland
Mar 14
OAK5:55 amOakland
16h 38m
2 stops
ONT10:33 pmOntario
$236
Find similar
Delta
Mar 11
ONT11:59 amOntario
11h 47m
2 stops
OAK11:46 pmOakland
Mar 14
OAK5:55 amOakland
16h 38m
2 stops
ONT10:33 pmOntario
$251
Find similar
Delta
Mar 2
ONT7:30 amOntario
8h 42m
2 stops
OAK4:12 pmOakland
Mar 14
OAK5:55 amOakland
11h 17m
2 stops
ONT5:12 pmOntario
$275
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Oakland, California 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 December 30, 2025.
Use the filters below to find and compare flights from Ontario to Oakland, California that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 1/27

5:50 pm-7:15 pm

Nonstop1h 25m

Oakland

Tue 2/3

2:45 pm-4:05 pm

Nonstop1h 20m

$177

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 1/27

5:50 pm-7:15 pm

Nonstop1h 25m

Oakland

Tue 2/3

10:30 am-1:50 pm

1 stop3h 20m

$183

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 1/27

3:20 pm-4:45 pm

Nonstop1h 25m

Oakland

Tue 2/3

10:20 am-4:25 pm

2 stops6h 05m

$192

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Sat 1/17

6:35 am-8:00 am

Nonstop1h 25m

Oakland

Tue 1/20

2:45 pm-4:05 pm

Nonstop1h 20m

$196

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 1/27

3:25 pm-9:45 pm

2 stops6h 20m

Oakland

Tue 2/3

10:30 am-1:50 pm

1 stop3h 20m

$198

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Sat 1/17

9:00 am-3:05 pm

1 stop6h 05m

Oakland

Tue 1/20

6:10 pm-7:30 pm

Nonstop1h 20m

$206

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 1/27

8:30 am-2:50 pm

2 stops6h 20m

Oakland

Tue 2/3

7:25 am-1:50 pm

2 stops6h 25m

$207

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Sat 1/17

5:50 am-1:25 pm

2 stops7h 35m

Oakland

Tue 1/20

6:10 pm-7:30 pm

Nonstop1h 20m

$211

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 1/20

3:20 pm-4:45 pm

Nonstop1h 25m

Oakland

Thu 1/22

1:00 pm-2:20 pm

Nonstop1h 20m

$215

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 2/24

7:20 am-8:45 am

Nonstop1h 25m

Oakland

Sun 3/1

9:00 pm-10:20 pm

Nonstop1h 20m

$218

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to San Francisco from

How to get the cheapest flight ticket from Ontario to Oakland, California

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 Oakland, California?

The month of September is, on average, the cheapest month to fly to Oakland, California from Ontario, with most prices found around $179. If you aren’t able to travel to Oakland, California during the month of September, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $207.

What is the cheapest day to depart on your flight to Oakland, California?

According to our data, Saturday is the cheapest day to fly to Oakland, California from Ontario. The lowest ticket price found for a Saturday departure recently was $273. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to Oakland, California for around $376.

What is the cheapest time of day to depart on your flight to Oakland, California?

At noon is the cheapest time of day to fly from Ontario to Oakland, California when you can find flight prices for as low as $249. Flying to Oakland, California at noon is an ideal time because this is during off-peak travel hours. Flights in the morning are often more expensive with an average ticket price of $291.

What is the cheapest Ontario to Oakland flight route?

Fly from Ontario to Oakland for the best Ontario - Oakland flight prices

How far in advance should I book a flight to Oakland, California?

You are more likely to see cheaper flights to Oakland, California from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Oakland, California for around $245 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Oakland, California from Ontario for as low as $178 on momondo.

What cabin class options are available on Ontario to Oakland flights?

There is only 1 cabin class available to choose from on Ontario to Oakland flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Ontario to Oakland, California flight prices changed over time?

As of December 2025, prices for Ontario to Oakland, California flights are approximately 75% more expensive when compared to flights at the same time last year.

When to book flights from Ontario to Oakland, California

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

Cheap Ontario to Oakland, California (ONT to OAK) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Oakland, California

Best Price Found

$179

Fastest flight time

1h 20m

Direct flights

Mon, Wed, Thu, Fri, Sat and Sun

Airports in Oakland, California

1 airport
The best one-way flight to Oakland, California from Ontario in the past 72 hours is $179. The best round-trip flight deal from Ontario to Oakland, California found on momondo in the last 72 hours is $279.
The fastest flight from Ontario to Oakland, California takes 1h 20m
Direct flights go from Ontario to Oakland, California on Monday, Wednesday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
There is 1 airport in Oakland, California. From Ontario there are direct flights to Oakland (OAK).
Search flight deals

  • How far is Ontario to Oakland by plane?

    Oakland is 365.2 mi away from Ontario. A reasonable flight in good conditions will take 1h 20m.

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

    Prices for flights from Ontario Airport to Oakland Airport refresh daily.

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Oakland Airport.

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

    The necessary travel and health documents for your Oakland 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 Oakland, California?

  • What is the most popular airline from Ontario to Oakland, California?

Best airlines flying from Ontario to Oakland, California

Compare and see reviews for airlines that fly from Ontario to Oakland, California with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $38Free CancellationRating
5.7
3,065 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $48Free CancellationRating
6.3
8,235 reviews
Search Spirit Airlines flights
SouthwestPriceFrom $115Free CancellationRating
8.0
4,251 reviews
Search Southwest flights

  • Southwest Flights From Ontario to Oakland, California

    Southwest flight deals from Ontario to Oakland, California start from $115 round-trip. Over the 17 Southwest flights for this route in a normal week, average airfare is usually $261 round-trip - but some users have found much cheaper deals with momondo.

Why use momondo?

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

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

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

momondo does allow users to show only those flights to Oakland from Ontario which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Ontario to Oakland?

momondo helps you find the best flight between Ontario and Oakland by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

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

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