OAK - ONT

$49 Find Cheap Flights from Oakland to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Oakland to Ontario departing on 8/18. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Oakland to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Oakland to Ontario, as well as popular online travel agencies
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Cheap Flights from Oakland to Ontario (OAK-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Oakland to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Oakland to Ontario

Thu, Aug 14 - Mon, Aug 18
Southwest Logo
1:10 pm - 2:30 pmOAK-ONT
1h 20mnonstop
Southwest Logo
5:50 am - 7:10 amONT-OAK
1h 20mnonstop
$97Southwest
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Thu, Aug 14 - Mon, Aug 18
Southwest Logo
1:10 pm - 2:30 pmOAK-ONT
1h 20mnonstop
Southwest Logo
6:20 pm - 11:20 pmONT-OAK
5h 00m1 stop
$107Southwest
Find Deal
Thu, Aug 14 - Mon, Aug 18
Southwest Logo
3:40 pm - 10:55 pmOAK-ONT
7h 15m1 stop
Southwest Logo
6:20 pm - 11:20 pmONT-OAK
5h 00m1 stop
$117Southwest
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Thu, Aug 7 - Sat, Aug 9
Southwest Logo
1:10 pm - 2:30 pmOAK-ONT
1h 20mnonstop
Southwest Logo
9:55 am - 11:15 amONT-OAK
1h 20mnonstop
$124Southwest
Find Deal
Thu, Aug 7 - Sat, Aug 9
Southwest Logo
6:05 am - 7:30 amOAK-ONT
1h 25mnonstop
Southwest Logo
5:25 am - 9:05 amONT-OAK
3h 40m1 stop
$134Southwest
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Sat, Sep 6 - Mon, Sep 8
Southwest Logo
5:10 am - 12:30 pmOAK-ONT
7h 20m2 stops
Southwest Logo
9:55 am - 11:15 amONT-OAK
1h 20mnonstop
$139Southwest
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Thu, Aug 7 - Sat, Aug 9
Southwest Logo
6:40 pm - 10:45 pmOAK-ONT
4h 05m1 stop
Southwest Logo
5:25 am - 9:05 amONT-OAK
3h 40m1 stop
$144Southwest
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Tue, Sep 30 - Fri, Oct 3
Southwest Logo
6:55 pm - 8:20 pmOAK-ONT
1h 25mnonstop
Southwest Logo
9:40 am - 11:00 amONT-OAK
1h 20mnonstop
$146Southwest
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Tue, Aug 26 - Wed, Aug 27
Alaska Airlines Logo
8:00 am - 5:00 pmOAK-ONT
9h 00m1 stop
Alaska Airlines Logo
5:49 pm - 8:59 amONT-OAK
15h 10m1 stop
$302Alaska Airlines
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Mon, Aug 25 - Wed, Aug 27
Alaska Airlines Logo
7:07 pm - 11:53 pmOAK-ONT
4h 46m1 stop
Alaska Airlines Logo
5:49 pm - 8:59 amONT-OAK
15h 10m1 stop
$312Alaska Airlines
Find Deal
Expert advice

Expert advice for your flight from Oakland to Ontario

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-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.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airports
OAK

OAK's compact size makes it easy to navigate, minimizing stress during departure. Plan for an extra half hour for security lines.

Read more about OAKby Gabriel Leigh
ONT

For a budget-friendly arrival, use Omnitrans Bus Route 61, connecting to key transit centers with frequent service.

Read more about ONTby Jennifer Simonson
Our travel experts
Jennifer Simonson

Jennifer Simonson

Expert on ONT

Jennifer Simonson

Jennifer Simonson

Jennifer Simonson is driven by her lifelong commitment to exploring the globe. Her insatiable curiosity had led her to immerse herself into diverse locations like Oklahoma City and Pismo. Her hotel recommendations are the result of the myriad hotels she's stayed at across her travels. Along her journey, she cherishes engaging conversations with locals, indulging in the finest ice cream, trying her hand at surfing, and embarking on nature-filled hikes.

Read more
Gabriel Leigh

Gabriel Leigh

Expert on OAK

Gabriel Leigh

Gabriel Leigh

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more
Useful Info

KAYAK's insights & trends for Oakland to Ontario flights

Get data-powered insights and trends into flights from Oakland to Ontario to help you find the cheapest flights, the best time to fly and much more.

Find cheap flights to Ontario
Find cheap flights to Ontario

Planning a trip from Oakland to Ontario? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

What’s the cheapest day of the week to fly from Oakland to Ontario?

The average price of all round-trip flights from Oakland to Ontario clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Ontario on a Sunday, as we generally find the cheapest rates on that day for this route. On the other hand, Monday is the most expensive day to fly from Oakland to Ontario. For your return ticket, we recommend flying on a Saturday and avoiding Tuesdays for the best deals.

What is the cheapest month to fly from Oakland to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Oakland to Ontario, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Oakland to Ontario is September, where tickets cost $213 (return) on average. On the other hand, the most expensive months are February and April, where the average cost of round-trip tickets is $280 and $268 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Oakland to Ontario, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Oakland to Ontario, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 25 weeks before departure.

Good to know

Low seasonAugust
High seasonMarch
Cheapest flight$49
Best time to beat the crowds with an average 0% drop in price.
Most popular time to fly with an average 10% increase in price.
Flight from Oakland to Ontario

When to book flights from Oakland to Ontario

Are your dates flexible? Find out the best times to travel from Oakland to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Oakland to Ontario

  • What are the transport options from Ontario International Airport (ONT)?

    A very cost-effective and convenient way to make the trip from the airport to the downtown area is to travel on the line number 61 bus operated by Omnitrans that can take you from the airport to the downtown area in about 17 minutes.

  • Which hotels are near Ontario International Airport?

    One of the best hotel choices for travelers that wish to stay close to this airport is the Comfort Suites Ontario Convention Center, that not only sits close to the airport property but also offers a free airport shuttle.

  • Where are the car rental providers at Ontario International Airport?

    All of the major rental car companies that operate at this airport do so at the offsite rental car center. There is a complimentary shuttle service between the terminal building and the rental car center that is quite easy to access at the curbside just outside of the baggage claim exit doors.

  • Where can I meet my driver at at Ontario International Airport?

    Both of the terminal buildings offer dedicated rideshare pick-up areas. To find these areas, simply exit the terminal building from the baggage claim area, and you will quickly find signage showing the location of the designated pick-up points on the curbside outside the terminal.

  • What is the cheapest flight from Oakland to Ontario?

    In the last 3 days, the lowest price for a flight from Oakland to Ontario was $49 for a one-way ticket and $97 for a round-trip.

  • Do I need a passport to fly between Oakland and Ontario?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airlines offer Wi-Fi service onboard planes from Oakland to Ontario?

    Delta, Alaska Airlines, Hawaiian Airlines, American Airlines, and JetBlue offer inflight Wi-Fi service on the Oakland to Ontario flight route.

  • Which aircraft models fly most regularly from Oakland to Ontario?

    The Boeing 737-800 Passenger/BBJ2 (winglets) is the aircraft model that flies most regularly on the Oakland to Ontario flight route.

  • On which days can I fly direct from Oakland to Ontario?

    There are nonstop flights from Oakland to Ontario on a daily basis.

  • How does KAYAK find such low prices on flights from Oakland to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Oakland to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Oakland to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Oakland is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Oakland to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to Oakland with another airline. Booking your flights between Oakland and ONT can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Oakland to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Oakland up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Oakland to Ontario

  • Looking for a cheap flight? 25% of our users found flights on this route for $129 or less one-way and $259 or less round-trip.
  • For those travelers that would like to make their way from the downtown area of Oakland to the Oakland International Airport (OAK) without having to drive in their own car, a good option is to take the Bay Area Rapid Transit Orange line to the Colosseum station and then transfer to the beige line to continue to the airport. This entire trip takes around 22 minutes to finish.
  • Passengers that are going to drive their own car to the Oakland International Airport should be aware of the fact that this airport offers quite a variety of different parking choices ranging from their premier lot that offers the closest parking to the terminal building down to their economy lot that offers the cheapest daily rates and free shuttle service back to the terminal building.
  • Nursing moms traveling through the Oakland International Airport should know that this airport offers two Mamava Nursing Pod locations at this airport with one of these pods being in each of the terminal buildings at the airport.
  • If you are trying to find a comfortable place to wait for your flight at Oakland International Airport, one location to consider is the Escape Lounge, that has a location near gate eight. You can go online to book your spot ahead of time, and when you get to the lounge, you will see that it offers plenty of comfortable seating options as well as a good selection of food and beverage choices.
  • For those travelers that will be making the trip to Ontario with a pet or a service animal, it is good to know that the Oakland International Airport features pet relief areas both inside and outside of the terminal buildings. The indoor space sits adjacent to gate 25 and features a sink, cleaning tools, artificial turf, and a miniature red fire hydrant.

Prefer to fly direct from Oakland to Ontario?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Oakland to Ontario.
Find which airlines fly direct from Oakland Airport to Ontario Airport, which days they fly and book direct flights.

Direct departures

Oakland to Ontario

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Direct returns

Ontario to Oakland

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Reviews of the top 5 airlines serving from Oakland to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Oakland to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Oakland to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4270 reviews
8.6Crew
7.0Food
7.6Entertainment
8.0Comfort
8.2Boarding
Airline reviews

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

4.0 OkayTraci, Jun 2025OAK - SEA
Read more Southwest reviews

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

First time traveling on Southwest since bag fees were implemented. Usual good service. Just more expensive now.

It was a perfect flight in all aspects! Both legs!

Boarding process, crew were good. But the seats were so uncomfortable that was all I could focus on. I literally had to sit forward so that all 3 of us could fit in row. I will try to avoid Southwest in the future for any flights over 60 minutes.

Great flight, 47 passengers on a 180 seat plane. Stewardess was pleasant and cheerful.

Great experience flying Southwest. The crew was really kind and helpful, and very friendly with our toddler.

Plane late from DC to Austin 30 minutes. Crew made up much of the time enroute to San Diego.

Fine, but how to board on SW versus othrr airlines, is just lame. Goood staff though and all was solid otherwise.

We had a nice flight. Boarding was easy, our seats were comfortable and the on board service was pleasant.

Service was great, boarding and exiting went smoothly, and the flight was very pleasant.

Crew was excellent. Comfort seats not as nice as other kinds of planes.

Not a "Delta" issue, but a JFK issue: We booked a connecting flight with 3 1/2 hours between to clearn immigration and customs. Our inbound flight (BCN to JFK) was on the taxiway 45 minutes which ate into our layover time. Immigtration was insanely quick with the CBP MPC app; however, clearing TSA (again, after we were ALREADY cleared in Spain on the inbound international flight) took over 95 minutes. This left us with 10 minutes before boarding the connecting flight (JFK to SAN) to walk to the far end of Terminal 4 and try to find food. We didn't find any food that could promise to serve us in under 10 minutes so we boarded the Delta flight after coming off a plance and an 8-hour flight knowing that we wouldn't be served any food on the next 5 1/2 hour flight. I feel like Delta needs to put pressure on the JFK TSA to open more screening stations (by our count, we saw only 5 scanners open and a line of - as we said - over 90 minutes. The insult is that we WERE ALREADY SCREENED through TSA, but as you come off one flight into the USA, you have to go through the whole process again. It seems like if you have a connecting flight, there should be a way to pass through immigration and customs without needing to return through TSA.

It was a great flight and the stewards and stewardess were all kind and accommodating!! The seats were comfortable and entertainment screen excellent!

There are 4 flights in consecutive gates with about the same departure time. Two flights were boarding at the same time. One was delayed or boarding would be happening at the same time. I am not sure what Delta and LAX need to do to have a better layout at the end of Terminal 2

5 hours of delay that could've been much shorter if Delta had taken the 1 hour delay they imposed on the flight before boarding to run any of the plane checks required for flight to find the hydraulic issue that required nearly 3 hours to fix. $24 of meal credit buys a sandwich and a soft drink. Poor communication within the terminal about what gate we'd be re-boarding from and when we'd be re-boarding.

The entertainment and wifi mostly didn't work on this flight.

Terrible entertainment system - kept freezing and audio kept cutting out. Snacks were mediocre at best for a 5 hour flight.

I am still upset that my bag was lost on a recent trip to Rome ; we were inconvenienced and out €150 Euros ; delta has refused to reimburse us

This had nothing to do with Delta… The flights were on time and flawless. The service was excellent. We purchased seats in (aisle/middle) comfort plus since this was a cross country flight. Unfortunately, the woman seated at the window was 300+ pounds and, as might be expected, covered up about a third of the middle seat also. there was absolutely nothing that Delta could have done about that… I just don’t know what the answer should be. If you purchase a seat, you should should be able to use the entire seat and not just the portion that someone else is not sitting/oozing in. Disappointing…there should be something that could be done….I'm just not sure what solution could be.

Seats are much much more comfortable than United, which is what I usually fly

Boarded plane and then delayed 1.5 hours while on the plane

Horrific. They missed my connecting flight to San Diego. I didn’t get there until Monday at 9am when I had a mandatory court settlement conference scheduled at 6am since we had parties on the east coast. This caused many issues. All because United apparently forgot to hold the doors open until my flight landed that only had a 10 minute delay. This was the last flight to Southern California. So I couldn’t even rent a car to finish the trip. United cannot be trusted when traveling on specific days and times since weather didn’t have anything to do with the delays.

My flight was delayed a very short period of time but they did not hold my connecting flight to San Diego, also through United. So they closed the doors before we got off our plane. They would only have to help the door open for another five to ten minutes. So I missed a court deadline for a manditory mediation settlement conference for my client. I had to get an associate to be there in person and be on the phone with him relaying what he needs to do the entire time. The court was very upset with me and so was my client. United cannot be trusted.

We were given vouchers we couldn’t use with a 5.5 hour delay

Really good 😊 the woman at the gate entrance was a little rude checking in our carry-on but i dont think she worked for the airline, she worked for the airport at sacramento, other than that amazing.

Boarding was mayhem. Late boarding by 15 minutes because of lack of staff (missing 1 flight attendant. We had to wait for an arrival of another plane before we could board). Flight was a little rough, but cannot blame on airlines.

Great experience…left a bit behind schedule but made up fir that in the air and landed 10 minutes early 😁

United out of SFO is having issues with catering so none of our meals were loaded on the plane and no offer of compensation for our tickets purchased was offered.

A bit rush for transit. Food and entertainment are not available

The gate was too far away for the connecting flight

Boarding was a breeze, however, two of the flights that I boarded with Spirit did not have Wi-Fi available.

Very good. Nothing more or less than expected. No complaints.

My experience with the spirit as a first time it was OK, but the seats need a little cushion, the problem I had the most impacted me was when checking in the scales were so off and wrong. It will tell that you would have more weight, which was not true. The scale was say that it had Thirty Eight Pounds, when get in the labels when we send the luggage into the band. It says that it was overweight. I really really dislike that because the scales are not accurate. If I use Spirit and I have that issue again. That will be my last time flying with the spirit, even though I like so much to service the planes, and everything else

hahaha we are delayed for one hour plus.. but thx we arrived San Diego safe

Worst airline ever! The guy weighing my bag had his foot on the metal plate and when I called him out on it, I got this stupid little smirk. La is a scam and so is Spirit Airlines. All the flight attendants looked like they hated our flight just as much as we did.

Unclear pricing; ended up being charged an extra $52 just to get onboard

Spirit is awful. Too expensive for what you get. Stop nickel and diming.

would be great to get basic water, soda at least and stop charging for carry ons

Your crew is a representation of your Standards and Values. The crew from Seattle to LAX, was very disappointing. The crew was more interested in hanging out at the lobby area. Talking, laughing loudly and eating all the snacks. They did not do regular rounds to see if customers needed anything. This was a huge disappointment. I will no longer be flying with your airlines moving forward.

- flight attendants not very friendly. - Paid for WiFi and plane didn’t have it working , never got a refund.

Very bad! No good service delayed my second connection flight

They canceled flight. Hard to believe there was even a plane incoming for us to get on

Cancelled flight after I arrived at airport after 75 min drive and parking. Next flight was 4 days in the future. Had to scramble and buy a much more expensive flight on another carrier.

I liked the turn-style feature at gate 209B at LAX. Very efficient process. The gate staff also made several, clearly directed announcements so I felt very informed.

Plane was down graded and I lost my uncharged exit row with more leg room. No mention or offer of refund from podium. Flight attendant was nice to explain this happens often and that I could request a refund via online form submission. I did this and have heard nothing back.

Horrendous. I do not recommend Frontier. The passengers lack manners and decency, and the flight attendants lack professionalism. If I wasn’t in a bind to fly with 48 hours notice for a job interview, I would not have selected a flight with Frontier and I never plan to fly with them in the future.

The seats were hard molded plastic covered in plastic vinyl. And the scam to charge people extra to sit together. Don’t they know we can just ask someone to trade seats. And watching the staff separate young children from parents… super classy. We had to guilt them into offering up our seats. This companies policies suck. Don’t give them your money.

The seats were awful, hard plastic covered in sheet vinyl. The airline tries to scam you into paying extra to get seat together when the flight wasn’t full. They were going to separate a family with young children but my wife who had a row to herself gave up her seat so the young mom could be with her young boys. I’m never giving this airline my money again.

It was a short flight so no food or entertainment….

Frontier had yet another flight cancellation. Have never made a complete round trip with this airline without at least one leg getting cancelled. Miserable flights - dirty, uncomfortable planes that apparently always have issues since I've had multiple delays and cancellations with them.

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