OAK - ONT

$99 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 5/26. 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, 0 bags

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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Everything you should know

Cheapest round-trip
$197
Typical prices: $326-$178
Southwest
Wed 5/6Wed 5/6
OAK - ONT • Non-stop
Cheapest one-way
$99
Typical prices: $87-$156
Southwest
Tue 5/26
OAK - ONT • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
OAK's compact size eases navigation for departures.
For a budget-friendly arrival, use Omnitrans Bus 61.
Expert advice
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Nonstop flights
You can fly direct with Southwest. Average duration is 1h 20m
Direct flights
Direct flights
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Direct flights
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When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 55% compared to booking last minute.
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When to travel
Cheapest • 27% price drop
Most popular
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Flight Deals

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

Wed, May 6 - Wed, May 6
Southwest Logo
10:45 am - 12:05 pm
OAK
-
ONT
1h 20mnonstop
Southwest Logo
5:50 pm - 7:10 pm
ONT
-
OAK
1h 20mnonstop
$197Southwest
Wed, May 6 - Wed, May 6
Southwest Logo
10:45 am - 12:05 pm
OAK
-
ONT
1h 20mnonstop
Southwest Logo
4:30 pm - 10:35 pm
ONT
-
OAK
6h 05m
1 stop
$207Southwest
Tue, May 12 - Sat, May 16
Southwest Logo
3:45 pm - 5:05 pm
OAK
-
ONT
1h 20mnonstop
Southwest Logo
5:20 pm - 6:40 pm
ONT
-
OAK
1h 20mnonstop
$209Southwest
Tue, Jun 2 - Tue, Jun 2
Southwest Logo
6:10 am - 11:55 am
OAK
-
ONT
5h 45m
2 stops
Southwest Logo
5:50 pm - 7:10 pm
ONT
-
OAK
1h 20mnonstop
$212Southwest
Tue, May 26 - Wed, May 27
Southwest Logo
6:00 am - 10:05 am
OAK
-
ONT
4h 05m
1 stop
Southwest Logo
4:30 pm - 10:35 pm
ONT
-
OAK
6h 05m
1 stop
$217Southwest
Tue, May 12 - Sat, May 16
Southwest Logo
8:50 pm - 10:10 pm
OAK
-
ONT
1h 20mnonstop
Southwest Logo
5:40 am - 12:25 pm
ONT
-
OAK
6h 45m
1 stop
$219Southwest
Sat, May 2 - Sat, May 2
Southwest Logo
10:55 am - 12:15 pm
OAK
-
ONT
1h 20mnonstop
Southwest Logo
5:20 pm - 6:40 pm
ONT
-
OAK
1h 20mnonstop
$221Southwest
Tue, Jun 2 - Wed, Jun 3
Southwest Logo
4:10 pm - 9:45 pm
OAK
-
ONT
5h 35m
2 stops
Southwest Logo
4:30 pm - 10:35 pm
ONT
-
OAK
6h 05m
1 stop
$222Southwest
Tue, May 12 - Sat, May 16
Southwest Logo
2:30 pm - 7:35 pm
OAK
-
ONT
5h 05m
2 stops
Southwest Logo
6:00 am - 7:20 am
ONT
-
OAK
1h 20mnonstop
$224Southwest
Tue, May 5 - Tue, May 12
Southwest Logo
2:30 pm - 7:35 pm
OAK
-
ONT
5h 05m
2 stops
Southwest Logo
6:30 am - 1:05 pm
ONT
-
OAK
6h 35m
2 stops
$227Southwest
Booking Insights

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.

How much is a round-trip flight from Oakland, California to Ontario?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Oakland, California to Ontario departing in May.

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 Tuesday, 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 Mondays 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 August, where tickets cost $205 (return) on average. On the other hand, the most expensive months are February and January, where the average cost of round-trip tickets is $411 and $349 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, which saves you about 55% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 16 weeks before departure.

Expert advice

Expert advice for your flight from Oakland to Ontario

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Jennifer Simonson

Jennifer Simonson

Expert on ONT

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.

Gabriel Leigh

Gabriel Leigh

Expert on OAK

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.

Good to know

Low seasonJanuary
Cheapest flight$99
Best time to beat the crowds but there is an average 23% increase in price.
Most popular time to fly and prices are also 9% lower on average.
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 $99 for a one-way ticket and $197 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?

    Alaska Airlines, Delta, 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 MAX 8 is the aircraft model that flies most regularly on the Oakland to Ontario flight route.

  • Which airline alliances offer flights from Oakland to Ontario?

    Star Alliance is the only airline alliance operating flights between Oakland and Ontario.

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

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

  • Which is the best airline for flights from Oakland to Ontario, Southwest or United Airlines?

    The two airlines most popular with KAYAK users for flights from Oakland to Ontario are Southwest and United Airlines. With an average price for the route of $281 and an overall rating of 8.0, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $217 and an overall rating of 7.4.

  • 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 $139 or less one-way and $249 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 3 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 4335 reviews
8.1Boarding
8.6Crew
7.5Entertainment
7.0Food
8.0Comfort
Airline reviews

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

4.0 Okaysangeetha, Apr 2026
AUS - SJC
Read more Southwest reviews

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

Boarding was easy. The seats are small and fairly uncomfortable

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

No food or entertainment, just a quick 40 minute flight. A little bumpy due to Santa Ana winds but pilot has no control over that. Good flight and landing!

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

Mediocre. Boarding is now unpleasant. The employees, once friendly and nice, are now regularly speaking sternly to passengers, badgering them to do things right so they can take off on time and gate check bags because they don't have enough overhead bin space. The pretzel snack was crushed flat and broken into even smaller pieces, which happens frequently lately. Drink service was suspended before they reached my row.

The charges were ridiculous for an hour flight and the turbulence was very scary.

3 hour delay. Had to change plans and was still delayed.

The flight crew was extremely rude and especially not helpful when our flight was delayed.

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

Flight left on time, arrived early, pleasant staff provided water, coffee, etc. access to bathrooms was reasonable and were well maintained. blankets were available, lots of entertainment options. LUGGAGE SERVICE WAS GREAT. I got my one checked bag quickly and was able to make a bus connection for a 2 hour bus ride saving me from waiting another 1.5 hours.

Terrible, if possible won't be flying again anytime soon!

Wonderful in-seat entertainment with seatback screens and huge selection of quality movies. The ability to bluetooth connect headphones was amazing.

Horrible service no Wi-Fi connection on both leg of the flight and they are refusing to fix bad service

I will never fly ANA again. They lost one of my large pieces of checked luggage, the heaviest one with the most valuable items in it, and they said they will not send me an email unless they can't find it, even though the paper they gave me to track the status of my lost luggage requires a code from an email they are supposed to send me so I can do baggage tracing. They claim to be an international airline, but they also insist on calling a Japanese telephone number to confirm where to send the lost baggage if they find it. It is impossible to find an actual contact email address for customer support on their website, and their AI chatbot is unhelpful, directing you to a webpage that says it is for contact information but does not have any actual email addresses or phone numbers listed on it. My seat in economy did not recline at all, even though I was not sitting in an exit row nor the very back row. I had to sit in the fully upright position for over ten hours of international travel. Awful experience overall.

Flight delayed for more than 16 hrs and no effort was spent to provide an alternate

Overall we had a good experience during our flight from San Francisco to Houston.

it was a very short flight so my expectations were low.

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Flight delayed. WiFi connectivity very poor if not existant. Last minute arrival forced me to run to catch my connection.

Remind customers of the need to have passport or new ID for boarding.

The flight never took off and we spent 7 hours at the airport

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

It was ok. It was expensive to check 2 bags ($75.00 per bag), and then it took a long time to wait for shuttle to take us from one terminal to the terminal where the plane was taking off at LAX. And all of this for a flight where we had to pay for any food or drink that was not water.

When I wanted to check in 3 hours prior to boarding time, the employees mentioned “a little over an hour delay” so I waited for an hour then I went to go look for food in the terminal and most people from that flight were in the same area looking for food. Finally I decided after food to check to see if it’s anytime closer and now it’s 2 mins until boarding closes?! What are you kidding me? I didn’t receive anything via sms about boarding now nor via email or on the intercom. I luckily made it through, barely, and then there’s no room for my carry on mind you I’m in the very first row so I had to place my purse in one further row back and my carry on sections down. Not sure who pays for better seats to get your stuff placed all over the plane but that was the worst experience I’ve ever had flying with anyone.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

i was unable to check in the flight. refund requested

I think Frontier was very good at communication. Their app worked very well. Loading was great and the flight was nice and easy.

This airline sucks. They offer low rates then charge you for everything, the app does not work well, the seats are the most uncomfortable. Maintenance issues on the flight, and you still have to sit through their credit card commercials. People are nice enough but does not make up for overall poor experience.

Great for the price. No wifi or entertainment, but gate agents and crew were fantastic and we boarded quickly and left on time.

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

Other airlines flying from Oakland to Ontario

Flights from the other most popular airlines that fly from Oakland to Ontario according to KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.