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ONT - OAK

Find cheap flights from Ontario to Oakland from $153

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 6/18. 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
0 bags
vie. 6/7
vie. 6/14

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These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Oakland.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Oakland.
In the last 7 days travelers have searched 43,968,530 times on KAYAK, and here is why:

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Cheap flight deals 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 and deals for you by selecting your travel dates.
Choose your dates
6:00 am - 11:59 pmONT-OAK
17h 59m1 stop
6:00 am - 11:58 pmOAK-ONT
17h 58m1 stop
$308Alaska Airlines
Find Deal
mié., jun. 5 - mié., jun. 12
6:00 am - 12:15 pmONT-OAK
6h 15m1 stop
8:22 pm - 11:58 pmOAK-ONT
27h 36m1 stop
$329Alaska Airlines
Find Deal
mar., jun. 4 - mar., jun. 4
8:09 pm - 11:59 pmONT-OAK
27h 50m1 stop
6:00 am - 9:05 amOAK-ONT
27h 05m1 stop
$332Alaska Airlines
Find Deal
mié., jun. 5 - lun., jun. 10
6:00 am - 12:15 pmONT-OAK
6h 15m1 stop
8:22 pm - 9:05 amOAK-ONT
12h 43m1 stop
$334Alaska Airlines
Find Deal
mié., may. 29 - mar., jun. 4
4:24 pm - 11:55 pmONT-OAK
7h 31m1 stop
6:00 am - 11:59 pmOAK-ONT
17h 59m1 stop
$338Alaska Airlines
Find Deal
lun., jun. 17 - mié., jun. 19
6:00 am - 4:46 pmONT-OAK
10h 46m2 stops
6:00 am - 9:05 amOAK-ONT
27h 05m1 stop
$349Alaska Airlines
Find Deal
mié., may. 29 - vie., may. 31
6:00 am - 6:36 pmONT-OAK
12h 36m2 stops
8:22 pm - 9:05 amOAK-ONT
12h 43m1 stop
$359Alaska Airlines
Find Deal
jue., may. 30 - lun., jun. 3
8:20 pm - 9:20 amONT-OAK
13h 00m1 stop
2:40 pm - 11:59 pmOAK-ONT
9h 19m1 stop
$363Alaska Airlines
Find Deal
lun., jul. 29 - mar., jul. 30
5:35 am - 11:55 pmONT-OAK
18h 20m1 stop
5:50 am - 11:41 pmOAK-ONT
17h 51m1 stop
$410Delta
Find Deal
vie., jun. 28 - lun., jul. 1
1:20 pm - 11:51 pmONT-OAK
10h 31m1 stop
1:20 pm - 9:39 pmOAK-ONT
8h 19m1 stop
$655Delta
Find Deal
jue., may. 23 - dom., may. 26

Flights from Ontario to Oakland - Travel Insights & Trends

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.

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

The average price of all flights from Ontario to Oakland, California clicked on KAYAK for each day over the last 12 months.
Your flight ticket price will generally be cheaper if you fly to Oakland on a Tuesday and more expensive on a Sunday. On your return trip to Ontario, you should consider flying back on a Tuesday, and avoid Thursdays for better deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Ontario to Oakland, California, 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, California is September, where tickets cost $82 on average. On the other hand, the most expensive months are February and January, where the average cost of tickets is $175 and $139 respectively.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Ontario to Oakland, California, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Ontario to Oakland, California, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 82 days before departure.

Which airlines provide the cheapest flights from Ontario to Oakland?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 3 days, Alaska Airlines offered the best one-way deal for that route, at $153. KAYAK users also found Ontario to Oakland round-trip flights on Alaska Airlines from $308 and on Delta from $410.

How many flights are there between Ontario and Oakland, California per day?

Each day, there are between 5 and 10 nonstop flights that take off from Ontario and land in Oakland, California, with an average flight time of 1h 16m. The most common departure time is 6:00 am and most flights take off in the morning. Each week, there are 57 flights. The most frequent day of departure is Friday, when 18% of all weekly flights depart. The fewest flights depart on a Saturday.

Which cabin class options are there for flights between Ontario and Oakland, California?

The average price of flights for each cabin class for the route found by users searching on KAYAK over the last 2 weeks.
There is only one cabin class option available for the route, which is Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

What’s the earliest departure time from Ontario to Oakland?

Early birds can take the earliest flight from Ontario at 6:10 am and will be landing in Oakland, California at 7:30 am.

What’s the latest departure time from Ontario to Oakland?

If you prefer to fly at night, the latest flight from Ontario to Oakland, California jets off at 8:45 pm and lands at 10:00 pm.

Good to know

Low season

February

High season

May

Cheapest flight

$153
Best time to beat the crowds but there is an average 33% increase in price.
Most popular time to fly and prices are also 20% 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, California?

    In the last 3 days, the lowest price for a flight from Ontario to Oakland, California was $153 for a one-way ticket and $308 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 aircraft models fly most regularly from Ontario to Oakland?

    We unfortunately don’t have that data for this specific 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, Alaska Airlines or Delta?

    The two airlines most popular with KAYAK users for flights from Ontario to Oakland are Alaska Airlines and Delta. With an average price for the route of $291 and an overall rating of 8.0, Alaska Airlines 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 8.0.

  • 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.

See more FAQs

Top tips for finding a cheap flight from ONT to Oakland

  • 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.
See more tips

Prefer to fly non-stop from Ontario to Oakland?

Find which airlines fly direct from Ontario to Oakland, which days they fly and book direct flights.

Nonstop 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

Nonstop 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
See more direct flights

Top 5 airlines serving 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
Alaska AirlinesOverall score based on 9141 reviews
7.3Entertainment
8.6Crew
8.2Boarding
7.9Comfort
7.3Food
Airline reviews

They canceled the flight 30 minutes prior to departure without any heads up.

2.0 MediocreAnonymous, May 2024SFO - LAX
Read more about Alaska Airlines reviews

They canceled the flight 30 minutes prior to departure without any heads up.

We had a very scary attempted landing in Palm Springs and were redirected to Ontario. It was a stressful flight.

Every thing means , crew, service, timing, boarding is very good.

Good - San Jose security is a breeze. Exact opposite of San Diego. Flight on time. Bad - FA's were not that cheery or polite. I thought we may blow out a tire as the pilot slammed down a hard landing in perfect conditions. He came in pretty hot like he had a date waiting.

It was our baby’s first flight and everything went perfect. The flight attendant gave him his first set of wings and we were smooth flying from there.

It was so easy to board using my boarding pass on my iPhone, and I liked what I was given on the plane for food and drink, and everyone was very friendly.

The messaging about the change in flight destination and options for getting to SFO was poor. There should have been frequent updates. When I spoke to the boarding agent moment before we were supposed to board, he was flippant and offered no help before the announcement was made that transportation would be arranged. It was as poor of an experience that I've ever had.

My plane ride down landed 20 min late. Boarding at SFO was strange too. The people at the terminal were nice—but, boarding lacked direction, and was confusing . Coming back was worse—the plane was hours behind—and I barely caught the last Bart train back to San Francisco (3 min more and I would have been in trouble). It was a very stressful trip, and it didn’t need to be.

the departure got delayed due to SJC situation, but it was a quite good waiting thanks to Alaska airline teams.

WiFi connection bad. Food is really awful. Crew very nice and efficient

The only thing that would make the experience better is a little more leg room and the overhead bins are very low. I hit my head when I was settling into the middle seat and was nervous about poking my eye on the corner of a lowered bin when I was deplaning.

It helps manage expectations to know that this is a discount airline. I brought my own snacks so that I wouldn't have to buy something if I got hungry or thirsty for soda during the flight. One of my seat mates was unaware that he would have to pay $4 for a Coke and was a bit upset. He hadn't listened to the flight attendant say "Drinks for purchase?". All of the employees I interacted with were friendly and professional. My one complaint is that the overhead bins are very low when they are open. I was heading for the middle seat and unexpectedly hit the top of my head on the bottom of the open overhead bin. The headrests were also a little uncomfortable. But overall, for the price, it was a decent value, and I would fly Breeze again.

Flight was on time. The crew was efficient and kind.

Did not like the fact that I was charged to take on a bag I usually put in the overhead

My flight was delayed, not by much.?very good communication during fest and waiting to board.

Communication with airline electronically was difficult. No number seemed available to talk to customer service.

What could have been better is if Discover credit card would be able to purchase food

Crew was inconsistent in instructions in advising passengers about seat backs during take off. Perfunctory announcements except from cabin.

The experience with Breeze was really great. The app makes managing flights easy. You can check in on there 24 hours in advance, and your boarding pass is there, too. The flight crew and the staff at both our airports were wonderful. Snacks and drinks were reasonably priced. The seats were very comfortable, they even had adjustable headrests on every seat. The only downside is not having entertainment or Wi-Fi available onboard.

The price is amazing. I was worried about how the flight would be as I never flew then. Seats were very comfortable. We had lots of legroom. The Akron airport was really nice. Overall it didn't have the stress we usually experience with flying. Highly recommend

Should have video screens Plane audio was poor and without wired connection hard to understand crew. Should serve more than just cups of water and pretzels on six hour flight. Did not see crew rest of flight. Fix charging sockets to retain charging blocks.

Generally good but there wasn’t any staff available when my luggage didn’t appear at baggage claim in Fresno. It took about half an hour to locate a staff member to open up the locked room where it was being kept.

Do not like the feeling of being in the basic economy. Everyone should feel good no matter what.

Our original business class flight was cancelled so we not only downgraded but we were also spread out across the plane not sitting together in separate middle seats. My poor kids were scared and couldn’t see me on the flight and the crew wasn’t sensitive to the situation and what the airlines did to us. Very dissatisfied with United airlines.

The WiFi didn’t work and the seats are too close together. Very uncomfortable.

So so. Terrible aircraft choice for that leg of the flight.

delay several times and wait extra long to board. no entertainment service because there are problem for some rows. always encounter some delays for the last flight of the day.

On time every leg of the journey and exceptional staff at counter, gate, and on board. I haven’t travelled in US for a long time and was genuinely surprised how pleasant this was.

This was a Lufthansa flight. Disappointing main meal. Very rough over Canada and arrival at FRA. IFE was almost unusable.

Too many fees (but that seems to apply to all airlines nowadays)

The guy with severe body odor sat next to me. For the whole duration of the flight it was a torture. The airline should have better policy on limiting people with bad body odor to board the flight. Passengers should not be the ones to endure bad odor for the whole duration of the flight. The airline should be e the one to ensure decent air quality for ever passenger.

They charged me 212.00 for a heavy check in bag at the gate. The pricing and process was so confusing - as if it was designed to purposefully gouge customers who need to board plane. That experience combined with the outrageous price charged will prevent me from ever flying Spirit again. And I’ll be sure to tell the story to anyone who cares to hear.

The text told me it was changed to Terminal E and Gate D5. But with no one on site to ask questions there was confusion on where to go as all the gates were E's. Then we took the skyline to the D area. We left to get something to eat. No announcement was made but my daughter happened to asked and they told her our gate was moved to D12. I will not fly Spirit again.

The agent at the check in desk was absolutely rude. The rest of the team after that was good, but the check in process at LAS was miserable. The woman at the desk spoke like we were stupid and was rude throughout the process.

Its so random that they only allow 40 pounds on checked bags when all airlines take 55. They then charge you for each 10 extra pounds, so my checked suitcase was $130 and the flight $30 ... its like whattt, im for sure not traveling with Spirit again

So bad. The check in process was laborious and the check in agent didn't seem to know how to manage the process efficiently and was confused about how to check in my son's sports equipment. The baggage fees were outrageous and so expensive. $90 for a carry on bag? And $200 additional for 2 check ins. The security lines were insanely long and the terminal was not very nice in the Spirit area. $5 for a water on board. It was my first and last time flying Spirit - I tried to save $ by flying them due to the accommodating schedule but I should have paid for Southwest, because it would've actually ended up less expensive due to the free bags with Southwest. There were no charging ports on the airplane, no wifi and really uncomfortable seating. The flight crew were great though, courteous and efficient in their boarding. Flight was delayed 1 hour, but we made up 15 minutes in flight.

My experience was better than expected. What I did find not so great was the seats. Very little room, they did not recline and the tray table was the size of a post card. There was no food to try, just standard snacks that you had to pay for and I don’t know of any entertainment. I would fly again even though everything was an upcharge. Flight was on time with little disturbance

thy don't even ofer water we have to buy it for $4.49 and paid for our cary on bags $100 each we never will fly in this company again.

Super cool and laid back, three lovely ladies. Couldn’t ask for better service.

It was fine. Boarding was a little rude. On flight staff was great. The cost to purchase everything was a bit annoying but I get that's the business model.

Our flight was delayed an hour, then when we got to board our flight finally, we were waiting in our seats for take off for 45 minutes before it was communicated that there was a maintenance issue therefore we waited on the plane for over an hour while that was resolved. We did not get to Phoenix until almost 3 hours after we were originally supposed to. This was the first and last time I will be flying Frontier.

There were 3 leg for the trip and each leg was delayed by 90 minutes or more. The boarding process takes forever with people waiting on the jetway even though most folks do not have carry-on. The whole process is poorly managed.

They cancelled the flight then did nothing to help us rebook. It was awful - I won’t fly with them again

The process of buying the ticket and navigating all the hidden charges that Frontier throws at you was a terrible experience. The actual airport experience and flying was fine.

The truck that was refueling the plane drove away with the hose still connected to the plane and ripped part of the plane off with it

Terrible. Seats are bad and the baggage policy is inconsistent

Better than I expected but I did pay for a seat and carry on bags ahead of time.

The boarding time. I was in Section 1 the lady in charge just let people in section 3 without see us. Make a line , I have to step out and ask her. We were in the line and she just take my ticket and that’s it, so if I don’t ask her she could leave us at the end! We paid more for that privilege and. She doesn’t care….

I hope to avoid flying with them in the future. First flight got cancelled then got stuck with a 13 hour layover in Denver. The process was long and frustrating to many people.

Flight was delayed on the runway for 40 minutes the crew did not even offer even water to passengers to compensate for the flight delayed. The flight was delayed due to aircraft mechanical issues. Worst customer service ever

Book cheap flights from Ontario to Oakland

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Ontario to Oakland found on KAYAK in the last 72 hours.
6/18mar.
1 stopAlaska Airlines
27h 35mONT-OAK
$153
5/29mié.
2 stopsAlaska Airlines
10h 46mONT-OAK
$162
6/4mar.
1 stopAlaska Airlines
13h 51mONT-OAK
$163
6/26mié.
1 stopAlaska Airlines
13h 00mONT-OAK
$167
6/12mié.
1 stopAlaska Airlines
17h 59mONT-OAK
$177
5/25sáb.
1 stopDelta
9h 22mONT-OAK
$288
5/24vie.
1 stopDelta
18h 54mONT-OAK
$289
6/5mié.
1 stopVolaris
18h 59mONT-OAK
$354
6/23dom.
1 stopVolaris
16h 01mONT-OAK
$376
5/13lun.
1 stopHawaiian Airlines
12h 55mONT-OAK
$511

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Last minute flights from Ontario to Oakland

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Ontario to Oakland that are departing in the next 10 days.
5/11sáb.
multi-stopDelta
16h 57mONT-OAK
5/14mar.
multi-stopDelta
10h 46mOAK-ONT
$685
5/9jue.
multi-stopDelta
18h 06mONT-OAK
5/14mar.
multi-stopDelta
22h 53mOAK-ONT
$688
5/11sáb.
multi-stopDelta
16h 57mONT-OAK
5/13lun.
multi-stopDelta
17h 53mOAK-ONT
$789
5/9jue.
multi-stopDelta
10h 31mONT-OAK
5/13lun.
multi-stopDelta
17h 53mOAK-ONT
$792
5/13lun.
multi-stopAlaska Airlines
17h 25mONT-OAK
5/16jue.
multi-stopAlaska Airlines
9h 18mOAK-ONT
$847
5/12dom.
multi-stopAlaska Airlines
7h 15mONT-OAK
5/18sáb.
multi-stopAlaska Airlines
8h 34mOAK-ONT
$877
5/12dom.
multi-stopVolaris
19h 28mONT-OAK
5/20lun.
multi-stopVolaris
22h 58mOAK-ONT
$1,263
5/9jue.
multi-stopVolaris
16h 01mONT-OAK
5/13lun.
multi-stopVolaris
24h 51mOAK-ONT
$1,296
5/12dom.
multi-stopAmerican Airlines
14h 28mONT-OAK
5/14mar.
multi-stopAmerican Airlines
24h 42mOAK-ONT
$2,359
5/10vie.
multi-stopAmerican Airlines
14h 28mONT-OAK
5/13lun.
multi-stopAmerican Airlines
11h 24mOAK-ONT
$2,394

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Ontario - Oakland Flights

Departure:

Ontario (undefined)United States

Destination:

Oakland (OAK)United States

Return flight deals:

Oakland - Ontario

Cabin classes: