ONT - OAK

$99 Find Cheap Flights from Ontario to Oakland

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Oakland 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 Oakland

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Oakland, 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 Ontario to Oakland, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$197
Typical prices: $409-$116
Southwest
Wed 5/13Wed 5/20
ONT - OAK • Non-stop
Cheapest one-way
$99
Typical prices: $103-$322
Southwest
Tue 5/26
ONT - OAK • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
ONT offers streamlined security with short wait times.
For a quick trip to SF, BART trains from OAK are ideal.
Expert advice
Expert advice
Expert advice
Expert advice
Nonstop flights
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
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 58% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 31% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
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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 Oakland!
Flight Deals
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Flight Deals

Cheap Flights from Ontario to Oakland (ONT-OAK)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Oakland 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 Ontario to Oakland

Wed, May 13 - Wed, May 20
Southwest Logo
5:50 pm - 7:10 pm
ONT
-
OAK
1h 20mnonstop
Southwest Logo
10:45 am - 12:05 pm
OAK
-
ONT
1h 20mnonstop
$197Southwest
Wed, May 13 - Wed, May 20
Southwest Logo
2:25 pm - 8:35 pm
ONT
-
OAK
6h 10m
1 stop
Southwest Logo
3:45 pm - 5:05 pm
OAK
-
ONT
1h 20mnonstop
$207Southwest
Wed, May 13 - Mon, May 18
Southwest Logo
5:55 am - 7:15 am
ONT
-
OAK
1h 20mnonstop
Southwest Logo
4:00 pm - 5:20 pm
OAK
-
ONT
1h 20mnonstop
$209Southwest
Tue, May 12 - Wed, May 13
Southwest Logo
6:30 am - 1:05 pm
ONT
-
OAK
6h 35m
2 stops
Southwest Logo
6:00 am - 7:20 am
OAK
-
ONT
1h 20mnonstop
$212Southwest
Wed, May 13 - Tue, May 19
Southwest Logo
3:45 pm - 10:25 pm
ONT
-
OAK
6h 40m
1 stop
Southwest Logo
10:15 am - 3:05 pm
OAK
-
ONT
4h 50m
1 stop
$217Southwest
Wed, May 13 - Mon, May 18
Southwest Logo
3:45 pm - 10:25 pm
ONT
-
OAK
6h 40m
1 stop
Southwest Logo
8:00 pm - 9:20 pm
OAK
-
ONT
1h 20mnonstop
$219Southwest
Sat, May 23 - Sat, May 23
Southwest Logo
12:55 pm - 2:15 pm
ONT
-
OAK
1h 20mnonstop
Southwest Logo
5:50 pm - 7:10 pm
OAK
-
ONT
1h 20mnonstop
$221Southwest
Wed, May 13 - Tue, May 19
Southwest Logo
2:25 pm - 8:35 pm
ONT
-
OAK
6h 10m
1 stop
Southwest Logo
4:10 pm - 9:45 pm
OAK
-
ONT
5h 35m
2 stops
$222Southwest
Tue, May 5 - Sat, May 9
Southwest Logo
5:55 am - 7:15 am
ONT
-
OAK
1h 20mnonstop
Southwest Logo
12:40 pm - 7:20 pm
OAK
-
ONT
6h 40m
2 stops
$224Southwest
Sat, May 23 - Sat, May 23
Southwest Logo
6:00 am - 7:20 am
ONT
-
OAK
1h 20mnonstop
Southwest Logo
4:10 pm - 8:15 pm
OAK
-
ONT
4h 05m
1 stop
$231Southwest
Booking Insights

KAYAK's insights & trends for Ontario to Oakland flights

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

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

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

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

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

For Ontario to Oakland, Saturday is the cheapest day to fly on average and Monday is the most expensive. Flying from Oakland back to Ontario, the best deals are generally found on Tuesday, with Monday being the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Oakland, 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 Ontario to Oakland is September, where tickets cost $179 (return) on average. On the other hand, the most expensive months are January and March, where the average cost of round-trip tickets is $329 and $299 respectively.

Can I save money by flying with a layover from Ontario to Oakland?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $298 on average.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to Oakland, 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 Ontario to Oakland, you should book around 4 weeks before departure, which saves you about 58% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 13 weeks before departure.

Expert advice

Expert advice for your flight from Ontario to Oakland

 
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 27% increase in price.
Most popular time to fly and prices are also 31% lower on average.
Flight from Ontario to Oakland

When to book flights from Ontario to Oakland

Are your dates flexible? Find out the best times to travel from Ontario to Oakland 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 Ontario to Oakland

  • Can I get parking at Ontario International Airport?

    Parking at ONT is easy, affordable and convenient. There are 5 parking lots at ONT labeled 1-5. From the terminals, parking lots 2, 3 and 4 are accessible via walking but parking lot 5 is accessed using the inter-terminal shuttle bus. Parking lots 2 and 4 provide overnight parking with both general and premium parking packages and parking for electric vehicles for around $9 per hour to around $27 per day. Parking lots 5 and 3 are generally cheaper and charge around $16 for a full day of parking.

  • What family services does Oakland International Airport offer?

    OAK has Mamava Lactation pods located throughout the airport for nursing mothers to breastfeed their children and pump. The pods at OAK have enough space for the mother, baby, a small family and even a smaller and they have electric power outlets, a collapsible table and two benches. They can be found between Gates 25 and 26 at Terminal 2.

  • Does Oakland International Airport have lounges?

    The Escape Lounge at OAK is located between Gates 8 and 8A at Airside at Terminal 1. Economy class travelers can relax at Escape Lounge while accessing their services including snacks, television, and non-alcoholic beverages and can also view the Flight Information Monitor.

  • What cities are near Oakland International Airport?

    OAK is not far from cities like Alameda, Hayward, Moraga, Fairview, Ashland, San Lorenzo, San Leandro and Berkley.

  • What is the cheapest flight from Ontario to Oakland?

    In the last 3 days, the lowest price for a flight from Ontario to Oakland was $99 for a one-way ticket and $197 for a round-trip.

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

    No, a passport isn't needed to fly from Ontario to Oakland. However, local authorities might ask for an official ID.

  • Which airports will I be using when flying from Ontario to Oakland?

    When flying out of Ontario you will be using Ontario. You will be landing at Oakland, also known as Oakland.

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

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

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

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the Ontario to Oakland flight route.

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

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to Oakland are Southwest and Frontier. With an average price for the route of $274 and an overall rating of 8.0, Southwest is the most popular choice. Frontier is also a great choice for the route, with an average price of $105 and an overall rating of 5.7.

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

    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 Ontario to Oakland.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Oakland from Ontario 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 Ontario to Oakland?

    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 Oakland with an airline and back to Ontario with another airline. Booking your flights between Ontario and OAK 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 Ontario to Oakland?

    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 Oakland from Ontario 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 Ontario to Oakland

  • Looking for a cheap flight? 25% of our users found flights on this route for $141 or less one-way and $289 or less round-trip.
  • Ontario International Airport (ONT) is a medium-sized international airport in Ontario consisting of three terminals, Terminals 2, 4 and the International Arrivals Terminal. Terminal 2 has 12 boarding gates while Terminal 4 has 14 boarding gates and all flights depart from either of these two terminals. Terminal 4 is served by American Airlines and Southwest Airlines, which has a direct flight from Ontario to Oakland. The International Arrivals Terminal handles all international arrivals to ONT. All the terminals are connected by a 24-hour free shuttle, which runs at intervals of about 15min, to each other, parking lot 5, the USO lounge and the Car Rental Facility.
  • The Oakland Museum of California implements a public art program at Oakland International Airport (OAK) that showcases art exhibitions at North Field, Terminal 2. There are several other artworks located at the Baggage Claim of Terminal 2, near Gates 26 and 32 post-security and Terminal 3, Airside.
  • Travelers and visitors of ONT traveling with pets and service animals can access services within their airport set aside for their potty needs. You can find both indoor and outdoor pet relief areas at ONT. The indoor option at ONT can be found near Gates 210 at Terminal 2 and near Gates 410 at Terminal 2.
  • If you’re traveling with heavy loads of luggage, have no worries. At ONT, you can rent baggage carts from the Baggage Claim area of both terminals, in the parking lots, and the Rental Car facility.
  • The Traveller’s Aid program at ONT is a non-profit organization with volunteers that provide travelers with general information about the airport and provide referral services. They help with situations like lost or stolen money, wiring money, transportation assistance, and emergency housing at ONT. They can be found between the Baggage Claim area and the escalator of both Terminals 2 and 4 between 9 am and 9 pm.

Prefer to fly direct from Ontario to Oakland?

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

Direct departures

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

Direct returns

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

Reviews of the top airlines flying from Ontario to Oakland

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Oakland. 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 Ontario to Oakland? 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 4338 reviews
8.6Crew
8.0Comfort
8.1Boarding
7.0Food
7.5Entertainment
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.

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 Ontario to Oakland

Other airlines flying from Ontario to Oakland

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