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

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 8/13. Fares are subject to change and may not be available on all flights or dates of travel.
OAK — ONT
Jul 5 — Jul 121
Sat 7/5
Sat 7/12
1 adult, Economy
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Cheapflights Tip: The best prices from Oakland to Ontario are usually found in September or May, booked 62 days in advance, depart on a Sunday or Wednesday and return on a Saturday

Cheap flight deals from Oakland to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Oakland (OAK) to Ontario (ONT). 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 June 30, 2025.

Round-trip from

$146
(Southwest)

One-way from

$49
(Southwest)

Popular in

February

Cheapest in

September

Average price

$241

Good round-trip deal

$259 or less

Good one-way deal

$129 or less
From Oakland to Ontario
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One-way flight from Oakland to Ontario
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Highest demand for flights based on searches. 5% potential increase in price ($15 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Oakland to Ontario.
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Price to beat on a one-way flight from Oakland to Ontario.
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Find flight deals from Oakland to Ontario

Cheapest flights from Oakland to Ontario
Explore the most affordable flight options available from Oakland to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 30, 2025.

This Southwest deal was found by Cheapflights users on 6/29. 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.
Thu 9/46:05 amOAK - ONT
Nonstop1h 25mSouthwest
Sun 9/712:15 pmONT - OAK
Nonstop1h 15mSouthwest
Deal found 6/29$146
This Alaska Airlines deal was found by Cheapflights users on 6/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/268:00 amOAK - ONT
1 stop9h 00mAlaska Airlines
Wed 8/2710:06 amONT - OAK
1 stop9h 12mAlaska Airlines
Deal found 6/29$302

Cheapflights Fare Finder

Customize your flight search to find flights from Oakland to Ontario 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 June 30, 2025.
Use the filters below to find and compare flights from Oakland to Ontario that are best for you.

Fly from

Oakland

Fly to

Ontario

Route

Depart

Return

Price

OaklandOntario

OAK - ONT

OAKONT

Oakland

Thu 9/4

6:05 am-7:30 am

Nonstop1h 25m

Ontario

Sun 9/7

12:15 pm-1:30 pm

Nonstop1h 15m

$146

OaklandOntario

OAK - ONT

OAKONT

Oakland

Tue 8/26

8:00 am-5:00 pm

1 stop9h 00m

Ontario

Wed 8/27

10:06 am-7:18 pm

1 stop9h 12m

$302

OaklandOntario

OAK - ONT

OAKONT

Oakland

Wed 8/13

4:15 pm-5:35 pm

Nonstop1h 20m

$49

OaklandOntario

OAK - ONT

OAKONT

Oakland

Wed 7/23

6:00 am-6:27 pm

1 stop12h 27m

$97

OaklandOntario

OAK - ONT

OAKONT

Oakland

Tue 8/12

8:00 am-6:04 pm

2 stops10h 04m

$137

OaklandOntario

OAK - ONT

OAKONT

Oakland

Sat 10/25

6:40 am-10:44 am

1 stop28h 04m

$160

OaklandOntario

OAK - ONT

OAKONT

Oakland

Mon 9/15

5:05 pm-10:40 pm

2 stops29h 35m

$183

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

Best time to book a flight from Oakland to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Oakland 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 Oakland to Ontario

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

Use this chart to determine the optimal time to book a round-trip flight from Oakland to Ontario. Price data was last updated on June 27, 2025.

To ensure you get the cheapest price possible for a flight from Oakland, California to Ontario, you should look to book at least 62 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, August is the cheapest month in which you can book a flight from Oakland, California to Ontario (average of $246). Flying from Oakland, California to Ontario in March is currently the most expensive (average of $328). 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 OAK to ONT?

Find hourly flight availability from Oakland to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 30, 2025.

A simple way to save on the total cost of your ticket is to fly from Oakland, California to Ontario in the evening. If you’re flexible enough to do this you can expect to save up to 13% on your trip compared to booking a flight in the morning.

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

Use this chart to determine the cheapest time to fly round-trip from Oakland to Ontario. Price data was last updated on June 22, 2025.

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

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated June 30, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta from Oakland to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Comfort

7.8

Food

7.1

Crew

8.5

Boarding

8.1

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

Overall

8.0

Entertainment

7.1

Comfort

7.8

Food

7.1

Crew

8.5

Boarding

8.1

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
4,278 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Comfort

7.8

Food

7.1

Crew

8.5

Boarding

8.1

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
7,969 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Comfort

7.8

Food

7.1

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,533 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Entertainment

7.1

Comfort

7.8

Food

7.1

Crew

8.5

Boarding

8.1

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 Oakland to Ontario. 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 Oakland to Ontario?

    If you book a flight from Oakland to Ontario, you will be flying from Oakland to Ontario. Flights to Ontario (ONT) from Oakland (OAK) take 1h 20m for a nonstop flight. There are 3 flights from Oakland to Ontario per day from 5 airlines.

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

    Within the past month, 6 users have taken a look at flights from Oakland to Ontario.

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

    Our cheapest airline available from Oakland, California to Ontario is Southwest. Our recent data shows that you can find tickets from as low as $146 on this airline. An additional option worth looking into is Alaska Airlines, starting at $302. Users have found that Southwest is 38% cheaper than the other options available to this destination.

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

    The cheapest airlines for a one-way flight from Oakland, California to Ontario are Southwest ($49), Alaska Airlines ($137), and Hawaiian Airlines ($160).

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

    Looking for the cheapest flight from Oakland, California to Ontario? While on average our users pay $238, our data indicates the cheapest price to be $38. The most popular route (Oakland - Ontario), is priced around $146.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Oakland to Ontario 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 Oakland, California to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Oakland, California to Ontario (average of $246). Flying from Oakland, California to Ontario in March is currently the most expensive (average of $328). 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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Alternative routes for Oakland to Ontario

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Top 5 airlines flying from Oakland to Ontario

Discover the top 5 airlines that operate flights from Oakland to Ontario. 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 June 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$27Average$96FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$46Average$96FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$58Average$137FlexibilityNo cancel feeOn-time69%
DeltaCheapest$98Average$204FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$178Average$273FlexibilityNo cancel feeOn-time63%

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