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$88+ 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 6/11. Fares are subject to change and may not be available on all flights or dates of travel.
OAK — ONT
May 6 — May 131
Tue 5/6
Tue 5/13
1 adult, Economy
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Cheapflights Tip: 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 Monday

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 May 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$175
(Southwest)

One-way from

$88
(Southwest)

Popular in

August

Cheapest in

July

Average price

$157

Good round-trip deal

$207 or less

Good one-way deal

$169 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, 7% potential price rise
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Cheapest flight prices on average. 3% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in May 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 May 1, 2025.

This Southwest deal was found by Cheapflights users on 5/1. 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.
Wed 6/256:00 amOAK - ONT
Nonstop1h 25mSouthwest
Wed 6/2510:55 amONT - OAK
Nonstop1h 15mSouthwest
Deal found 5/1$175
This Alaska Airlines deal was found by Cheapflights users on 4/30. 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.
Wed 5/2812:48 pmOAK - ONT
1 stop9h 58mAlaska Airlines
Sat 5/314:45 pmONT - OAK
1 stop7h 01mAlaska Airlines
Deal found 4/30$262
This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/106:00 amOAK - ONT
1 stop17h 42mDelta
Mon 7/141:15 pmONT - OAK
1 stop26h 59mDelta
Deal found 4/30$405
This lastminute.com deal was found by Cheapflights users on 4/30. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/247:54 pmOAK - ONT
1 stop15h 03mHawaiian Airlines
Sun 5/254:45 pmONT - OAK
1 stop19h 23mHawaiian Airlines
Deal found 4/30$494

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 May 1, 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

Wed 6/25

6:00 am-7:25 am

Nonstop1h 25m

Ontario

Wed 6/25

10:55 am-12:10 pm

Nonstop1h 15m

$175

OaklandOntario

OAK - ONT

OAKONT

Oakland

Wed 5/28

12:48 pm-10:46 pm

1 stop9h 58m

Ontario

Sat 5/31

4:45 pm-11:46 pm

1 stop7h 01m

$262

OaklandOntario

OAK - ONT

OAKONT

Oakland

Thu 7/10

6:00 am-11:42 pm

1 stop17h 42m

Ontario

Mon 7/14

1:15 pm-4:14 pm

1 stop26h 59m

$405

OaklandOntario

OAK - ONT

OAKONT

Oakland

Sat 5/24

7:54 pm-10:57 am

1 stop15h 03m

Ontario

Sun 5/25

4:45 pm-12:08 pm

1 stop19h 23m

$494

OaklandOntario

OAK - ONT

OAKONT

Oakland

Wed 6/11

6:00 am-7:25 am

Nonstop1h 25m

$88

OaklandOntario

OAK - ONT

OAKONT

Oakland

Thu 5/8

5:45 am-5:45 pm

1 stop12h 00m

$104

OaklandOntario

OAK - ONT

OAKONT

Oakland

Tue 6/10

2:31 pm-10:46 pm

1 stop8h 15m

$131

OaklandOntario

OAK - ONT

OAKONT

Oakland

Tue 6/3

6:00 am-6:20 pm

2 stops12h 20m

$137

OaklandOntario

OAK - ONT

OAKONT

Oakland

Sat 9/6

7:03 pm-11:53 pm

1 stop4h 50m

$289

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

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 May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy2 starsTrust 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 eDreams the most. eDreams 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.

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 April 25, 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 May 1, 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 11% 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 30, 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. Thursday at noon 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 May 1, 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. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,972 reviews

Overall

8.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.9

Entertainment

7.1

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
9,972 reviews
Alaska Airlines
8.0
Very good
9,972 reviews

Overall

8.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.9

Entertainment

7.1

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
4,294 reviews
Alaska Airlines
8.0
Very good
9,972 reviews

Overall

8.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.9

Entertainment

7.1

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
7,934 reviews
Alaska Airlines
8.0
Very good
9,972 reviews

Overall

8.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,408 reviews
Alaska Airlines
8.0
Very good
9,972 reviews

Overall

8.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.9

Entertainment

7.1

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, 3 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 $175 on this airline. Additional options worth looking into are Alaska Airlines and Delta, starting at $262 and $405 round-trip. Users have found that Southwest is 17% 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 ($88), Alaska Airlines ($131), and Delta ($137).

  • 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 $274, our data indicates the cheapest price to be $113. The most popular route (Oakland - Ontario), is priced around $175.

  • 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.

See more FAQs

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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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$29Average$96FlexibilityNo cancel feeOn-time62%
DeltaCheapest$45Average$179FlexibilityNo cancel feeOn-timeN/A
Spirit AirlinesCheapest$46Average$96FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$107Average$432FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$191Average$273FlexibilityNo cancel feeOn-time63%

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