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Cheap flights from Ontario to San Francisco from $75

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 2/10. 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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Find the cheapest flights from Ontario to San Francisco

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
11:55 am - 1:20 pmONT-OAK
1h 25mnonstop
Southwest Logo
9:35 am - 10:55 amOAK-ONT
1h 20mnonstop
$171Southwest
Find Deal
Sat, Dec 6 - Mon, Dec 8
Southwest Logo
10:45 am - 4:25 pmONT-OAK
5h 40m1 stop
Southwest Logo
6:20 am - 7:40 amOAK-ONT
1h 20mnonstop
$181Southwest
Find Deal
Sat, Dec 6 - Mon, Dec 8
Southwest Logo
10:45 am - 4:25 pmONT-OAK
5h 40m1 stop
Southwest Logo
5:25 am - 9:15 amOAK-ONT
3h 50m1 stop
$191Southwest
Find Deal
Sat, Dec 6 - Mon, Dec 8
Southwest Logo
3:55 pm - 5:15 pmONT-OAK
1h 20mnonstop
Southwest Logo
6:10 am - 7:30 amOAK-ONT
1h 20mnonstop
$204Southwest
Find Deal
Tue, Dec 16 - Sun, Dec 21
Southwest Logo
5:50 pm - 7:15 pmONT-OAK
1h 25mnonstop
Southwest Logo
1:00 pm - 2:20 pmOAK-ONT
1h 20mnonstop
$209Southwest
Find Deal
Tue, Jan 27 - Wed, Jan 28
Southwest Logo
6:45 am - 8:10 amONT-OAK
1h 25mnonstop
Southwest Logo
10:30 am - 1:50 pmOAK-ONT
3h 20m1 stop
$210Southwest
Find Deal
Sun, Feb 22 - Wed, Feb 25
Southwest Logo
5:55 am - 11:15 amONT-OAK
5h 20m1 stop
Southwest Logo
6:10 am - 7:30 amOAK-ONT
1h 20mnonstop
$214Southwest
Find Deal
Tue, Dec 16 - Sun, Dec 21
Southwest Logo
3:55 pm - 5:15 pmONT-OAK
1h 20mnonstop
Southwest Logo
6:25 am - 7:45 amOAK-ONT
1h 20mnonstop
$215Southwest
Find Deal
Thu, Dec 11 - Thu, Dec 18
Southwest Logo
12:35 pm - 6:20 pmONT-OAK
5h 45m2 stops
Southwest Logo
7:55 pm - 9:20 pmOAK-ONT
1h 25mnonstop
$219Southwest
Find Deal
Tue, Dec 16 - Sun, Dec 21
Southwest Logo
10:40 am - 2:05 pmONT-OAK
3h 25m1 stop
Southwest Logo
10:30 am - 1:50 pmOAK-ONT
3h 20m1 stop
$220Southwest
Find Deal
Tue, Jan 27 - Wed, Jan 28

Southwest flights from Ontario to Oakland, California

Our best Southwest deals on Ontario to Oakland, California flight tickets
Southwest
Dec 6
ONT11:55 amOntario
1h 25m
OAK1:20 pmOakland
Dec 8
OAK9:35 amOakland
1h 20m
ONT10:55 amOntario
$171
Find similar
Southwest
Dec 6
ONT10:45 amOntario
5h 40m
1 stop
OAK4:25 pmOakland
Dec 8
OAK6:20 amOakland
1h 20m
ONT7:40 amOntario
$181
Find similar
Southwest
Dec 6
ONT10:45 amOntario
5h 40m
1 stop
OAK4:25 pmOakland
Dec 8
OAK5:25 amOakland
3h 50m
1 stop
ONT9:15 amOntario
$191
Find similar

Alaska Airlines flights from Ontario to Oakland, California

Our best Alaska Airlines deals on Ontario to Oakland, California flight tickets
Alaska Airlines
Dec 4
ONT6:00 amOntario
17h 59m
1 stop
OAK11:59 pmOakland
Dec 8
OAK6:40 amOakland
16h 49m
1 stop
ONT11:29 pmOntario
$255
Find similar
Alaska Airlines
Dec 5
ONT7:33 pmOntario
15h 08m
1 stop
OAK10:41 amOakland
Dec 8
OAK6:40 amOakland
28h 39m
1 stop
ONT11:19 amOntario
$264
Find similar
Alaska Airlines
Dec 4
ONT6:00 amOntario
17h 59m
1 stop
OAK11:59 pmOakland
Dec 8
OAK6:40 amOakland
16h 49m
1 stop
ONT11:29 pmOntario
$266
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 November 13, 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

Sat 12/6

11:55 am-1:20 pm

Nonstop1h 25m

Oakland

Mon 12/8

9:35 am-10:55 am

Nonstop1h 20m

$171

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Sat 12/6

10:45 am-4:25 pm

1 stop5h 40m

Oakland

Mon 12/8

6:20 am-7:40 am

Nonstop1h 20m

$181

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Sat 12/6

10:45 am-4:25 pm

1 stop5h 40m

Oakland

Mon 12/8

5:25 am-9:15 am

1 stop3h 50m

$191

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 12/16

3:55 pm-5:15 pm

Nonstop1h 20m

Oakland

Sun 12/21

6:10 am-7:30 am

Nonstop1h 20m

$204

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 1/27

5:50 pm-7:15 pm

Nonstop1h 25m

Oakland

Wed 1/28

1:00 pm-2:20 pm

Nonstop1h 20m

$209

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Sun 2/22

6:45 am-8:10 am

Nonstop1h 25m

Oakland

Wed 2/25

10:30 am-1:50 pm

1 stop3h 20m

$210

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 12/16

5:55 am-11:15 am

1 stop5h 20m

Oakland

Sun 12/21

6:10 am-7:30 am

Nonstop1h 20m

$214

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Thu 12/11

3:55 pm-5:15 pm

Nonstop1h 20m

Oakland

Thu 12/18

6:25 am-7:45 am

Nonstop1h 20m

$215

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 12/16

12:35 pm-6:20 pm

2 stops5h 45m

Oakland

Sun 12/21

7:55 pm-9:20 pm

Nonstop1h 25m

$219

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 1/27

10:40 am-2:05 pm

1 stop3h 25m

Oakland

Wed 1/28

10:30 am-1:50 pm

1 stop3h 20m

$220

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, Friday is the cheapest day to fly to Oakland, California from Ontario. The lowest ticket price found for a Friday departure recently was $275. 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 $378.

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 $250. 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 $292.

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 $179 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 November 2025, prices for Ontario to Oakland, California flights are approximately 9% 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

$129

Fastest flight time

1h 20m

Direct flights

Every day

Airports in Oakland, California

1 airport
The best one-way flight to Oakland, California from Ontario in the past 72 hours is $129. The best round-trip flight deal from Ontario to Oakland, California found on momondo in the last 72 hours is $259.
The fastest flight from Ontario to Oakland, California takes 1h 20m
Direct flights go from Ontario to Oakland, California every day.
There is 1 airport near Oakland, California: 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
5.8
3,113 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $48Free CancellationRating
6.3
8,139 reviews
Search Spirit Airlines flights
SouthwestPriceFrom $115Free CancellationRating
8.0
4,236 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 27 Southwest flights for this route in a normal week, average airfare is usually $263 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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