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Cheap flights from Ontario to San Francisco 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 Ontario to San Francisco departing on 11/10. 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 (ONT-OAK)

Cheap round-trip flights

Southwest Logo
5:50 am - 7:10 amONT-OAK
1h 20mnonstop
Southwest Logo
8:30 am - 9:50 amOAK-ONT
1h 20mnonstop
$77Southwest
Find Deal
jue., sep. 18 - jue., sep. 18
Southwest Logo
8:35 am - 2:55 pmONT-OAK
6h 20m1 stop
Southwest Logo
4:15 pm - 5:35 pmOAK-ONT
1h 20mnonstop
$87Southwest
Find Deal
mar., sep. 23 - mar., sep. 23
Southwest Logo
6:30 am - 2:10 pmONT-OAK
7h 40m2 stops
Southwest Logo
11:50 am - 1:10 pmOAK-ONT
1h 20mnonstop
$92Southwest
Find Deal
mar., sep. 23 - sáb., sep. 27
Southwest Logo
3:35 pm - 9:00 pmONT-OAK
5h 25m1 stop
Southwest Logo
2:50 pm - 8:55 pmOAK-ONT
6h 05m1 stop
$97Southwest
Find Deal
sáb., nov. 1 - lun., nov. 3
Southwest Logo
6:30 am - 2:10 pmONT-OAK
7h 40m2 stops
Southwest Logo
3:25 pm - 8:45 pmOAK-ONT
5h 20m1 stop
$102Southwest
Find Deal
mar., sep. 23 - mar., sep. 23
Southwest Logo
5:45 am - 3:05 pmONT-OAK
9h 20m2 stops
Southwest Logo
10:15 am - 5:30 pmOAK-ONT
7h 15m2 stops
$113Southwest
Find Deal
sáb., sep. 6 - mar., sep. 9
Southwest Logo
6:10 pm - 7:30 pmONT-OAK
1h 20mnonstop
Southwest Logo
7:10 am - 8:30 amOAK-ONT
1h 20mnonstop
$114Southwest
Find Deal
mié., sep. 3 - dom., sep. 7
Southwest Logo
10:20 am - 4:20 pmONT-OAK
6h 00m1 stop
Southwest Logo
7:10 am - 8:30 amOAK-ONT
1h 20mnonstop
$124Southwest
Find Deal
mié., sep. 3 - dom., sep. 7
Logo
6:00 am - 1:34 pmONT-OAK
7h 34m1 stop
Logo
2:39 pm - 7:17 amOAK-ONT
16h 38m1 stop
$152
Find Deal
jue., sep. 18 - dom., sep. 21
Logo
6:00 am - 1:34 pmONT-OAK
7h 34m1 stop
Logo
6:30 am - 11:38 amOAK-ONT
5h 08m1 stop
$160
Find Deal
jue., sep. 11 - jue., sep. 18

Southwest flights from Ontario to Oakland, California

Our best Southwest deals on Ontario to Oakland, California flight tickets
Southwest
Sep 18
ONT5:50 amOntario
1h 20m
OAK7:10 amOakland
Sep 18
OAK8:30 amOakland
1h 20m
ONT9:50 amOntario
$77
Find similar
Southwest
Sep 23
ONT8:35 amOntario
6h 20m
1 stop
OAK2:55 pmOakland
Sep 23
OAK4:15 pmOakland
1h 20m
ONT5:35 pmOntario
$87
Find similar
Southwest
Sep 23
ONT6:30 amOntario
7h 40m
2 stops
OAK2:10 pmOakland
Sep 27
OAK11:50 amOakland
1h 20m
ONT1:10 pmOntario
$92
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 agosto 14, 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

jue. 9/18

5:50 am-7:10 am

Nonstop1h 20m

Oakland

jue. 9/18

8:30 am-9:50 am

Nonstop1h 20m

$77

OntarioOakland

ONT - OAK

ONTOAK

Ontario

mar. 9/23

8:35 am-2:55 pm

1 stop6h 20m

Oakland

mar. 9/23

4:15 pm-5:35 pm

Nonstop1h 20m

$87

OntarioOakland

ONT - OAK

ONTOAK

Ontario

mar. 9/23

6:30 am-2:10 pm

2 stops7h 40m

Oakland

sáb. 9/27

11:50 am-1:10 pm

Nonstop1h 20m

$92

OntarioOakland

ONT - OAK

ONTOAK

Ontario

sáb. 11/1

3:35 pm-9:00 pm

1 stop5h 25m

Oakland

lun. 11/3

2:50 pm-8:55 pm

1 stop6h 05m

$97

OntarioOakland

ONT - OAK

ONTOAK

Ontario

mar. 9/23

6:30 am-2:10 pm

2 stops7h 40m

Oakland

mar. 9/23

3:25 pm-8:45 pm

1 stop5h 20m

$102

OntarioOakland

ONT - OAK

ONTOAK

Ontario

sáb. 9/6

5:45 am-3:05 pm

2 stops9h 20m

Oakland

mar. 9/9

10:15 am-5:30 pm

2 stops7h 15m

$113

OntarioOakland

ONT - OAK

ONTOAK

Ontario

mié. 9/3

6:10 pm-7:30 pm

Nonstop1h 20m

Oakland

dom. 9/7

7:10 am-8:30 am

Nonstop1h 20m

$114

OntarioOakland

ONT - OAK

ONTOAK

Ontario

mié. 9/3

10:20 am-4:20 pm

1 stop6h 00m

Oakland

dom. 9/7

7:10 am-8:30 am

Nonstop1h 20m

$124

OntarioOakland

ONT - OAK

ONTOAK

Ontario

jue. 9/18

6:00 am-1:34 pm

1 stop7h 34m

Oakland

dom. 9/21

2:39 pm-7:17 am

1 stop16h 38m

$152

OntarioOakland

ONT - OAK

ONTOAK

Ontario

jue. 9/11

6:00 am-1:34 pm

1 stop7h 34m

Oakland

jue. 9/18

6:30 am-11:38 am

1 stop5h 08m

$160

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 $208. If you aren’t able to travel to Oakland, California during the month of September, then flying in July is also cheap. Prices for this month can be found on momondo for an average of $209.

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

According to our data, Tuesday is the cheapest day to fly to Oakland, California from Ontario. The lowest ticket price found for a Tuesday departure recently was $217. 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 Wednesday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to Oakland, California for around $275.

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

In the evening is the cheapest time of day to fly from Ontario to Oakland, California when you can find flight prices for as low as $181. Flying to Oakland, California in the evening is an ideal time because this is during off-peak travel hours. Flights in the afternoon are often more expensive with an average ticket price of $281.

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 $248 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 $138 on momondo.

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

There are 1 cabin classes 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 August 2025, prices for Ontario to Oakland, California flights are approximately 55% 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

$39

Fastest flight time

1h 15m

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 $39. The best round-trip flight deal from Ontario to Oakland, California found on momondo in the last 72 hours is $77.
The fastest flight from Ontario to Oakland, California takes 1h 15m
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 15m.

  • 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
3,219 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $43Free CancellationRating
6.3
8,045 reviews
Search Spirit Airlines flights
SouthwestPriceFrom $126Free CancellationRating
8.0
4,244 reviews
Search Southwest flights

  • Southwest Flights From Ontario to Oakland, California

    Southwest flight deals from Ontario to Oakland, California start from $126 round-trip. Over the 23 Southwest flights for this route in a normal week, average airfare is usually $262 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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