$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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from Oakland to Ontario with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.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 April 17, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $97 (Southwest) |
One-way from | $49 (Southwest) |
Popular in | August |
Cheapest in | July |
Average price | $212 |
Good round-trip deal | $209 or less |
Good one-way deal | $144 or less |
Find flight deals from Oakland to Ontario
Cheapest flights from Oakland to OntarioExplore 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 April 17, 2025.
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 April 17, 2025.
This Southwest deal was found by Cheapflights users on 4/17. 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.
This Alaska Airlines deal was found by Cheapflights users on 4/16. 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.
This Delta deal was found by Cheapflights users on 4/15. 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.
This Trip.com deal was found by Cheapflights users on 4/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
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 April 17, 2025.
Use the filters below to find and compare flights from Oakland to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
OaklandOntario
OAK - ONT
OAKONT
Oakland
Tue 6/3
4:45 pm-6:10 pm
Nonstop1h 25m
Ontario
Thu 6/5
2:15 pm-3:30 pm
Nonstop1h 15m
OaklandOntario
OAK - ONT
OAKONT
Oakland
Wed 5/14
8:00 am-11:58 pm
1 stop15h 58m
Ontario
Wed 5/21
4:45 pm-11:46 pm
1 stop7h 01m
OaklandOntario
OAK - ONT
OAKONT
Oakland
Sat 5/31
12:39 pm-10:35 pm
2 stops9h 56m
Ontario
Wed 6/4
6:00 am-4:15 pm
2 stops10h 15m
OaklandOntario
OAK - ONT
OAKONT
Oakland
Sat 5/10
9:15 am-3:32 pm
1 stop6h 17m
Ontario
Sun 5/11
8:59 pm-8:35 am
1 stop11h 36m
OaklandOntario
OAK - ONT
OAKONT
Oakland
Mon 5/19
6:00 am-7:25 am
Nonstop1h 25m
OaklandOntario
OAK - ONT
OAKONT
Oakland
Tue 5/20
6:52 pm-11:57 pm
1 stop5h 05m
OaklandOntario
OAK - ONT
OAKONT
Oakland
Mon 6/16
12:30 pm-10:25 am
2 stops21h 55m
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 April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars |
- 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.
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 11, 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 April 17, 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 April 17, 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.
Entertainment
Boarding
Comfort
Food
Crew
Overall
Reviews
Seleste,Dec 2024
FAT - SAN
Entertainment
Boarding
Comfort
Food
Crew
Overall
Reviews
Seleste,Dec 2024
FAT - SAN
Entertainment
Boarding
Comfort
Food
Crew
Overall
Reviews
Seleste,Dec 2024
FAT - SAN
Entertainment
Boarding
Comfort
Food
Crew
Overall
Reviews
Seleste,Dec 2024
FAT - SAN
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.
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Alternative routes for Oakland to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
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 April 17, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$84 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$47 | Average$97 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$98 | Average$167 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$107 | Average$432 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$198 | Average$277 | FlexibilityNo cancel fee | On-time63% |