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 3/25. 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
Overall average: $264
Southwest
Wed 4/1Wed 4/8
OAK - ONT • Non-stop
Cheapest one-way
$99
Typical prices: $98-$209
Southwest
Wed 3/25
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
Expert advice
Expert advice
Expert advice
Top airlines
Southwest
Cheapest • from $197 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Every day
You can fly direct with Southwest. Average duration is 1h 20m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 48% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
August
Cheapest • 26% price drop
March
Most popular
Good to know
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+1
+1
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Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ontario!
Flight Deals
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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, Apr 1 - Wed, Apr 8
Southwest Logo
6:35 am - 7:55 am
OAK
-
ONT
1h 20mnonstop
Southwest Logo
5:50 pm - 7:10 pm
ONT
-
OAK
1h 20mnonstop
$197Southwest
Wed, Apr 1 - Wed, Apr 8
Southwest Logo
6:35 am - 7:55 am
OAK
-
ONT
1h 20mnonstop
Southwest Logo
4:30 pm - 10:35 pm
ONT
-
OAK
6h 05m
1 stop
$207Southwest
Wed, Apr 1 - Wed, Apr 8
Southwest Logo
6:35 am - 7:55 am
OAK
-
ONT
1h 20mnonstop
Southwest Logo
10:40 am - 6:15 pm
ONT
-
OAK
7h 35m
2 stops
$212Southwest
Sat, Mar 21 - Tue, Mar 24
Southwest Logo
9:55 pm - 11:20 pm
OAK
-
ONT
1h 25mnonstop
Southwest Logo
8:00 pm - 9:25 pm
ONT
-
OAK
1h 25mnonstop
$217Southwest
Tue, Apr 7 - Wed, Apr 8
Southwest Logo
8:50 pm - 10:10 pm
OAK
-
ONT
1h 20mnonstop
Southwest Logo
4:30 pm - 8:20 pm
ONT
-
OAK
3h 50m
1 stop
$218Southwest
Tue, Jun 23 - Wed, Jun 24
Southwest Logo
6:05 am - 7:30 am
OAK
-
ONT
1h 25mnonstop
Southwest Logo
7:40 pm - 9:00 pm
ONT
-
OAK
1h 20mnonstop
$219Southwest
Tue, Apr 21 - Tue, Apr 28
Southwest Logo
2:30 pm - 7:35 pm
OAK
-
ONT
5h 05m
2 stops
Southwest Logo
2:25 pm - 8:35 pm
ONT
-
OAK
6h 10m
1 stop
$222Southwest
Tue, Apr 7 - Wed, Apr 8
Southwest Logo
8:50 pm - 10:10 pm
OAK
-
ONT
1h 20mnonstop
Southwest Logo
10:40 am - 6:15 pm
ONT
-
OAK
7h 35m
2 stops
$223Southwest
Tue, Mar 17 - Tue, Mar 17
Southwest Logo
12:05 pm - 1:25 pm
OAK
-
ONT
1h 20mnonstop
Southwest Logo
4:35 pm - 9:25 pm
ONT
-
OAK
4h 50m
1 stop
$227Southwest
Wed, Mar 25 - Sun, Mar 29
Southwest Logo
6:35 am - 7:55 am
OAK
-
ONT
1h 20mnonstop
Southwest Logo
5:40 am - 7:05 am
ONT
-
OAK
1h 25mnonstop
$228Southwest
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.

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 Wednesday 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 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 48% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 15 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 26% increase in price.
Most popular time to fly and prices are also 5% 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?

    SkyTeam, and Star Alliance are the airline alliances operating flights between Oakland and Ontario, with SkyTeam being the most commonly used for this route.

  • 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 Delta?

    The two airlines most popular with KAYAK users for flights from Oakland to Ontario are Southwest and Delta. With an average price for the route of $282 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $198 and an overall rating of 7.9.

  • 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 $277 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 4 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 4299 reviews
7.0Food
7.5Entertainment
8.0Comfort
8.1Boarding
8.6Crew
Airline reviews

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

2.0 MediocreDarcey, Feb 2026
SAN - SJC
Read more Southwest reviews

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.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

Still a fan of open seating. Flight was on schedule and arrived on time. The 737 MAX is very comfortable.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Delays delays delays. Late taking off, late landing, wait for a gate, etc.

Connecting flight is on time and boarding was a breeze!

Delta continues to set the benchmark for traveler-friendly service with minimal disruption and clear communication within the mainland US (coast to coast). I am consistently pleased to be a Delta customer, and this experience once again met my expectations. There was a brief delay departing from MIA due to a technical issue that required the aircraft to return to the gate. However, the situation was handled professionally and transparently. Fortunately, my planned layover allowed ample buffer time, so the adjustment caused no stress. Overall, another smooth and reassuring experience.

Awesome! On time flight, early arrival, and a complimentary upgrade!

Was forced to check in my small carry on, even though I informed the crew it has very fragile items inside

They double booked seats, the gate staff changed my ticket as I was boarding she went over to the computer and changed it without telling me. She messed up an entire three row section for me and others. Other travelers were outraged but the gate staff were so rude, so condescending saying it wasn't their problem to solve. I would rate this a zero if I could. Will not fly Delta again I'll stick with United and American.

I usually get upgraded so my experience is usually amazing. I did not get upgraded this time - which was fine - but the wifi had issues, the monitors were going in & out, & (though not Delta's fault) one of the gentlemen next to me desperately needed a shower.

I really liked the legroom. I am 6’4”.a at For some reason our seats were not together and using the app to fix it didn’t work. Passengers were nice enough to move for us but you should absolutely ensure a parent sits with their child.

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

The crew took good care of us. The flight from ATL to SFO is a longer one, and there were multiple beverage offerings. I like the 757's that Delta uses. Good airplane that is comfortable. I do wish Delta would separate Priority boarding from the better seats. I would gladly take a smaller seat in an open row than be jammed into Comfort just to get priority boarding, just to make sure I don't have to check a bag.

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.

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

the whole trip was smooth, and as comfortable as flying is these days. flight crew was friendly and very courteous and helpful.

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

Flight arrived 30 min early and bag was waiting at the baggage pickup. United Club HNL was one of the nicest in the system

Yet another flight in which beverage and snack service was skipped. Other that that, firmly mediocre. Landed early, to gate late due to congestion at the gates. Airline's fault or airports fault: unknown.

Teeny tiny bathrooms, crew was not realistic about when we'd arrive.

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.

Decent clean onboard experience. Okay discount airline experience. Unfortunately, any customer service interactions are difficult and unhelpful. There is no service. Also, a premium seat only gets you premium boarding if you line up first. Once they start general boarding you must go to the back of the line. Not very premium

The crew was mostly okay. The flight attendant who answered our questions was curt and unhelpful unfortunately. He seemed upset and I understand having off days.

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.