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$96+ 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 5/1. Fares are subject to change and may not be available on all flights or dates of travel.
OAK — ONT
Mar 19 — Mar 261
Wed 3/19
Wed 3/26
1 adult, Economy
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The best prices from Oakland to Ontario are usually found in July or June, booked 62 days in advance, depart on a Sunday or Thursday 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 March 14, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$191
(Southwest)

One-way from

$96
(Southwest)

Popular in

August

Cheapest in

July

Average price

$263

Good round-trip deal

$241 or less

Good one-way deal

$109 or less
Provider with most accurate pricing for Oakland-Ontario flight deals.
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Provider most trusted by Cheapflights users for Oakland-Ontario flights.
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From Oakland to Ontario
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One-way flight from Oakland to Ontario
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High demand for flights, 0% potential price rise
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Cheapest flight prices on average. 5% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 14, 2025.

This Southwest deal was found by Cheapflights users on 3/13. 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 4/176:00 amOAK - ONT
Nonstop1h 25mSouthwest
Mon 4/216:10 amONT - OAK
Nonstop1h 20mSouthwest
Deal found 3/13$191
This Alaska Airlines deal was found by Cheapflights users on 3/13. 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 4/158:25 pmOAK - ONT
1 stop13h 03mAlaska Airlines
Wed 4/165:44 pmONT - OAK
1 stop14h 59mAlaska Airlines
Deal found 3/13$263

Find flights from Oakland to Ontario within your budget

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 March 14, 2025.

Fly from

Oakland

Fly to

Ontario

Route

Depart

Return

Price

OaklandOntario

OAK - ONT

OAKONT

Oakland

Thu 5/1

8:40 pm-10:00 pm

Nonstop1h 20m

Ontario

Mon 5/5

6:10 am-7:30 am

Nonstop1h 20m

$191

OaklandOntario

OAK - ONT

OAKONT

Oakland

Wed 4/23

8:00 am-11:58 pm

1 stop15h 58m

Ontario

Tue 4/29

8:59 pm-8:35 am

1 stop11h 36m

$263

OaklandOntario

OAK - ONT

OAKONT

Oakland

Thu 4/3

6:43 am-11:59 pm

1 stop17h 16m

Ontario

Mon 4/7

7:17 pm-11:43 pm

1 stop28h 26m

$403

OaklandOntario

OAK - ONT

OAKONT

Oakland

Thu 5/1

10:45 am-12:05 pm

Nonstop1h 20m

$96

OaklandOntario

OAK - ONT

OAKONT

Oakland

Sat 4/26

7:46 am-9:23 pm

1 stop13h 37m

$99

OaklandOntario

OAK - ONT

OAKONT

Oakland

Wed 4/30

8:00 am-11:58 pm

1 stop15h 58m

$137

OaklandOntario

OAK - ONT

OAKONT

Oakland

Fri 4/11

5:15 pm-11:52 pm

1 stop6h 37m

$632

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/13

Compare providers for flights from Oakland to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Oakland to Ontario in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Oakland, California-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Oakland, California-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Oakland, California-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Oakland, California-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Oakland, California-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

Travel insights for flights from Oakland to Ontario

Get recent, data-driven insights about flights from Oakland to Ontario including ideal travel times, pricing trends, and more.

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 March 7, 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 $321). 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 March 14, 2025.

A simple way to save on the total cost of your ticket is to fly from Oakland, California to Ontario in the afternoon. If you’re flexible enough to do this you can expect to save up to 10% 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 March 9, 2025.

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

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 March 14, 2025.
Get a feel of what it's like to fly with Southwest, Alaska Airlines and Delta from Oakland to Ontario by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,292 reviews

Boarding

8.2

Comfort

8.1

Food

7.1

Entertainment

7.6

Crew

8.7

Overall

8.1

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Southwest
8.1
Very good
4,292 reviews
Southwest
8.1
Very good
4,292 reviews

Boarding

8.2

Comfort

8.1

Food

7.1

Entertainment

7.6

Crew

8.7

Overall

8.1

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Alaska Airlines
8.0
Very good
9,734 reviews
Southwest
8.1
Very good
4,292 reviews

Boarding

8.2

Comfort

8.1

Food

7.1

Entertainment

7.6

Crew

8.7

Overall

8.1

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Delta
8.0
Very good
7,944 reviews
Southwest
8.1
Very good
4,292 reviews

Boarding

8.2

Comfort

8.1

Food

7.1

Entertainment

7.6

Crew

8.7

Overall

8.1

Reviews

1 / 20

10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

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 4 airlines.

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

    Within the past month, 2 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 $191 on this airline. An additional option worth looking into is Alaska Airlines, starting at $263. Users have found that Southwest is 5% 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 ($96), Alaska Airlines ($137), and Delta ($632).

  • 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 $221, our data indicates the cheapest price to be $98. The most popular route (Oakland - Ontario), is priced around $191.

  • 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 $321). 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 4 airlines flying from Oakland to Ontario

Discover the top 4 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 March 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$30Average$96FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$47Average$105FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$153Average$438FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$198Average$276FlexibilityNo cancel feeOn-time63%
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