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$49+ Cheap flights from Ontario to Oakland, CA (ONT - OAK)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/6. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — OAK
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Oakland are usually found in July or August, booked 80 days in advance, depart on a Saturday or Friday and return on a Sunday

Cheap flight deals from Ontario to Oakland

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Oakland (OAK). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 29, 2025.

Round-trip from

$97
(Southwest)

One-way from

$49
(Southwest)

Popular in

December

Cheapest in

July

Average price

$209

Good round-trip deal

$168 or less

Good one-way deal

$128 or less
From Ontario to Oakland
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One-way flight from Ontario to Oakland
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Highest demand for flights based on searches. 6% potential increase in price ($18 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Ontario to Oakland.
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Price to beat on a one-way flight from Ontario to Oakland.
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Find flight deals from Ontario to Oakland

Cheapest flights from Ontario to Oakland
Explore the most affordable flight options available from Ontario to Oakland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

This Southwest deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/198:15 amONT - OAK
Nonstop1h 20mSouthwest
Wed 8/209:55 amOAK - ONT
Nonstop1h 20mSouthwest
Deal found 7/29$97
This Alaska Airlines deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/97:10 amONT - OAK
1 stop12h 08mAlaska Airlines
Wed 9/108:00 amOAK - ONT
2 stops10h 47mAlaska Airlines
Deal found 7/28$268

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Oakland that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 29, 2025.
Use the filters below to find and compare flights from Ontario to Oakland that are best for you.

Fly from

Ontario

Fly to

Oakland

Route

Depart

Return

Price

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 8/19

8:15 am-9:35 am

Nonstop1h 20m

Oakland

Wed 8/20

9:55 am-11:15 am

Nonstop1h 20m

$97

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 9/9

7:10 am-7:18 pm

1 stop12h 08m

Oakland

Wed 9/10

8:00 am-6:47 pm

2 stops10h 47m

$268

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Sat 9/6

9:55 am-11:15 am

Nonstop1h 20m

$49

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Tue 9/9

6:00 am-7:18 pm

2 stops13h 18m

$127

OntarioOakland

ONT - OAK

ONTOAK

Ontario

Wed 8/27

11:40 am-10:46 pm

2 stops11h 06m

$177

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Best time to book a flight from Ontario to Oakland

Have a flexible travel schedule? Discover the best time to fly to Oakland from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

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

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Oakland. Price data was last updated on July 25, 2025.

The price you pay for your flight from Ontario to Oakland, California may vary depending on when you book. For the best chance of a lower fare, look to book 80 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Ontario to Oakland, California?

Currently, April is the cheapest month in which you can book a flight from Ontario to Oakland, California (average of $183). Flying from Ontario to Oakland, California in November is currently the most expensive (average of $259). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to OAK?

Find hourly flight availability from Ontario to Oakland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 29, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 31% on flights from Ontario to Oakland, California by exploring options for tickets in the evening.

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

Use this chart to determine the cheapest time to fly round-trip from Ontario to Oakland. Price data was last updated on July 27, 2025.

Travelers seeking maximum savings on their Ontario to Oakland, California flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Oakland

Get insights into the airlines that provide service to Oakland. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Oakland. Reviews last updated July 29, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest, and Delta from Ontario to Oakland to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,238 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,977 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Oakland. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from Ontario to Oakland?

    If you wish to fly to Oakland from Ontario, then you need to book flights from Ontario to Oakland. There are 3 flights from Ontario (ONT) to Oakland (OAK) per day to choose from. Flights to Oakland from Ontario are available from 3 different airlines, which means you should have some options if you want to compare airfare deals. 1h 15m is how long a nonstop flight from Ontario to Oakland typically takes.

  • How popular is this Ontario to Oakland, California flight route?

    The Ontario to Oakland flight path was viewed by 8 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest airlines flying from Ontario to Oakland, California round-trip?

    Currently priced at $97, Southwest will fly you from Ontario to Oakland, California and back. In addition to Southwest, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on Alaska Airlines for as low as $268. Southwest is 60% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Ontario to Oakland, California one-way?

    $49 is the cheapest one-way deal found within the past few days, from Southwest. You may also be able to find cheap deals on Alaska Airlines and Delta, with prices starting from $127 and $177, respectively.

  • What are the cheapest flights from Ontario to Oakland, California?

    The cheapest flight price from Ontario to Oakland, California is $48. On average you can expect to pay $224. The most popular route, (Ontario - Oakland), can usually be booked for $97.

  • Can I find deals for flights from Ontario to Oakland that include hotel bookings?

    Yes. In addition to deals on Ontario to Oakland flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Oakland?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Oakland.

  • Can I find deals for business class flights from Ontario to Oakland?

    Yes. Cheapflights offers flight deals from Ontario to Oakland by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Oakland, California?

    Currently, April is the cheapest month in which you can book a flight from Ontario to Oakland, California (average of $183). Flying from Ontario to Oakland, California in November is currently the most expensive (average of $259). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Top 3 airlines flying from Ontario to Oakland

Discover the top 3 airlines that operate flights from Ontario to Oakland. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$38Average$88FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$43Average$74FlexibilityNo cancel feeOn-time65%
SouthwestCheapest$144Average$263FlexibilityNo cancel feeOn-time63%

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