HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Oakland

$73+ Cheap flights from Ontario to Oakland, CA (ONT - OAK)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — OAK
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Oakland with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Ontario to Oakland are usually found in September or July, booked 80 days in advance, depart on a Saturday or Friday and return on a Sunday

Cheap flight deals from Ontario to Oakland

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Oakland (OAK). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 11, 2025.

Round-trip from

$145
(Southwest)

One-way from

$73
(Southwest)

Popular in

December

Cheapest in

September

Average price

$207

Good round-trip deal

$178 or less

Good one-way deal

$129 or less
From Ontario to Oakland
Search Deals
One-way flight from Ontario to Oakland
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($16 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals
Price to beat on a round-trip flight from Ontario to Oakland.
Search Deals
Price to beat on a one-way flight from Ontario to Oakland.
Search Deals

Find flight deals from Ontario to Oakland

Cheapest flights from Ontario to Oakland
Explore the most affordable flight options available from Ontario to Oakland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Southwest deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/86:15 amONT - OAK
Nonstop1h 20mSouthwest
Wed 10/159:55 amOAK - ONT
Nonstop1h 20mSouthwest
Deal found 9/8$145
This Southwest deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/146:15 amONT - OAK
Nonstop1h 20mSouthwest
Fri 10/178:40 pmOAK - ONT
Nonstop1h 20mSouthwest
Deal found 9/10$151
This Southwest deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/111:00 amONT - OAK
Nonstop1h 20mSouthwest
Wed 10/14:15 pmOAK - ONT
Nonstop1h 20mSouthwest
Deal found 9/9$155
This Southwest deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/12:55 pmONT - OAK
Nonstop1h 20mSouthwest
Thu 10/25:45 amOAK - ONT
Nonstop1h 20mSouthwest
Deal found 9/10$156
This Southwest deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/26:30 pmONT - OAK
Nonstop1h 20mSouthwest
Mon 10/68:40 pmOAK - ONT
Nonstop1h 20mSouthwest
Deal found 9/9$157
This Southwest deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/114:55 pmONT - OAK
Nonstop1h 25mSouthwest
Mon 10/138:40 pmOAK - ONT
Nonstop1h 20mSouthwest
Deal found 9/10$163

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Oakland 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, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from Ontario to Oakland that are best for you.

Fly from

Ontario

Fly to

Oakland

Route

Depart

Return

Price

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Mon 10/6

3:00 pm-4:20 pm

Nonstop1h 20m

Oakland

Wed 10/8

3:05 pm-10:45 pm

1 stop7h 40m

$166

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Wed 10/1

2:55 pm-4:15 pm

Nonstop1h 20m

Oakland

Mon 10/6

8:40 pm-10:00 pm

Nonstop1h 20m

$171

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Fri 10/10

8:35 pm-9:55 pm

Nonstop1h 20m

Oakland

Sun 10/12

6:50 am-8:10 am

Nonstop1h 20m

$197

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Wed 10/1

12:20 pm-8:40 pm

1 stop8h 20m

Oakland

Thu 10/2

5:00 am-11:40 am

1 stop6h 40m

$200

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Wed 11/5

5:55 am-11:15 am

1 stop5h 20m

Oakland

Thu 11/6

12:20 pm-6:00 pm

2 stops5h 40m

$227

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Thu 10/9

8:35 pm-9:55 pm

Nonstop1h 20m

Oakland

Sun 10/12

9:45 am-1:35 pm

1 stop3h 50m

$228

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Thu 10/2

5:55 pm-10:55 pm

1 stop5h 00m

Oakland

Mon 10/6

8:40 pm-10:00 pm

Nonstop1h 20m

$228

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Thu 10/2

8:35 pm-9:55 pm

Nonstop1h 20m

Oakland

Sun 10/5

2:15 pm-11:55 pm

1 stop9h 40m

$234

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Fri 10/3

8:35 pm-9:55 pm

Nonstop1h 20m

Oakland

Sun 10/5

6:50 am-8:10 am

Nonstop1h 20m

$242

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 12/2

7:00 am-8:20 am

Nonstop1h 20m

$73

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 19 results
1
2

The best insider tips for Ontario to Oakland flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Ontario to Oakland trip
Airports
ONT

ONT's TSA security is smoother and quicker than LAX, making it ideal for weekday business travelers.

Read more about ONTby Bill Fink
OAK

Use BART for cost-efficient travel from OAK to San Francisco, especially during rush hour.

Read more about OAKby Bill Fink
Our travel experts
Bill Fink

Bill Fink

Expert on ONT and OAK

Bill Fink

Bill Fink

Bill is an award-winning travel writer with extensive credits covering airlines and the aviation industry for publications including AARP, AFAR, The Points Guy and Yahoo. Based in Portland, Oregon, Bill has traveled to more than 75 countries - and been late for his flight in most of them. He once achieved top-level frequent flier status for all of American, Delta and United Airlines during a single year.

Read more

Best time to book a flight from Ontario to Oakland

Have a flexible travel schedule? Discover the best time to fly to Oakland from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Oakland

How far ahead should I book a flight from Ontario to Oakland, California?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Oakland. Price data was last updated on August 29, 2025.

The price you pay for your flight from Ontario to Oakland, California may vary depending on when you book. For the best chance of a lower fare, look to book 80 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Ontario to Oakland, California?

Currently, April is the cheapest month in which you can book a flight from Ontario to Oakland, California (average of $183). Flying from Ontario to Oakland, California in November is currently the most expensive (average of $259). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to OAK?

Find hourly flight availability from Ontario to Oakland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 31% on flights from Ontario to Oakland, California by exploring options for tickets in the evening.

What is the cheapest day to fly from Ontario to Oakland, California?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Oakland. Price data was last updated on September 7, 2025.

Travelers seeking maximum savings on their Ontario to Oakland, California flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Oakland

Get insights into the airlines that provide service to Oakland. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Oakland. Reviews last updated September 11, 2025.
Peruse reviews from past customers who have flown with Southwest, Spirit Airlines, and Frontier from Ontario to Oakland to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Spirit Airlines
6.3
Okay
8,023 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Oakland. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from Ontario to Oakland?

    If you wish to fly to Oakland from Ontario, then you need to book flights from Ontario to Oakland. There are 3 flights from Ontario (ONT) to Oakland (OAK) per day to choose from. Flights to Oakland from Ontario are available from 3 different airlines, which means you should have some options if you want to compare airfare deals. 1h 15m is how long a nonstop flight from Ontario to Oakland typically takes.

  • How popular is this Ontario to Oakland, California flight route?

    The Ontario to Oakland flight path was viewed by 8 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Ontario to Oakland, California?

    Southwest can get you from Ontario to Oakland, California in just under 1h 20m. Your travel time will be generally consistent. Airlines will cover a distance of 361 mi. All flights are typically nonstop.

  • What are the cheapest airlines flying from Ontario to Oakland, California round-trip?

    Currently priced at $31, Spirit Airlines will fly you from Ontario to Oakland, California and back. In addition to Spirit Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Frontier and Southwest - these airlines can fly you to your destination from $38 and $125, respectively. Spirit Airlines is 87% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest flights from Ontario to Oakland, California?

    The cheapest flight price from Ontario to Oakland, California is $38. On average you can expect to pay $258. The most popular route, (Ontario - Oakland), can usually be booked for $150.

  • Can I find deals for flights from Ontario to Oakland that include hotel bookings?

    Yes. In addition to deals on Ontario to Oakland flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Oakland?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Oakland.

  • Can I find deals for business class flights from Ontario to Oakland?

    Yes. Cheapflights offers flight deals from Ontario to Oakland by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Oakland, California?

    Currently, April is the cheapest month in which you can book a flight from Ontario to Oakland, California (average of $183). Flying from Ontario to Oakland, California in November is currently the most expensive (average of $259). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Oakland

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Las Vegas flights
Los Angeles to San Francisco flights
San Francisco to Las Vegas flights
San Jose to Los Angeles flights
San Francisco to Los Angeles flights
Burbank to Las Vegas flights
Santa Ana to Las Vegas flights
San Francisco to Santa Ana flights
Santa Ana to San Francisco flights
Los Angeles to San Jose flights
Ontario to San Francisco flights
San Jose to Las Vegas flights
San Francisco to Ontario flights
Oakland to Las Vegas flights
San Francisco to Burbank flights
Oakland to Santa Ana flights
Burbank to San Francisco flights
Ontario to Las Vegas flights
San Francisco to San Diego flights
Sacramento to Las Vegas flights
San Francisco to Palm Springs flights
Los Angeles to Sacramento flights
San Diego to Las Vegas flights
San Jose to San Diego flights
Santa Ana to Oakland flights
Sacramento to Los Angeles flights
Oakland to Burbank flights
Sacramento to San Diego flights
San Diego to San Francisco flights
San Jose to Ontario flights
Ontario to San Jose flights
Los Angeles to Santa Rosa flights
Los Angeles to Reno flights
Burbank to Oakland flights
Santa Rosa to Las Vegas flights
Las Vegas to Los Angeles flights
San Jose to Santa Ana flights
San Francisco to Long Beach flights
Santa Ana to San Jose flights
San Diego to San Jose flights
Santa Rosa to Los Angeles flights
Fresno to Las Vegas flights
Las Vegas to Santa Ana flights
San Diego to Sacramento flights
Las Vegas to Burbank flights
Long Beach to San Francisco flights
Oakland to Los Angeles flights
Reno to Los Angeles flights
Ontario to Sacramento flights
Oakland to San Diego flights

Top 3 airlines flying from Ontario to Oakland

Discover the top 3 airlines that operate flights from Ontario to Oakland. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$31Average$85FlexibilityNo cancel feeOn-time65%
FrontierCheapest$38Average$88FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$125Average$261FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.