$62+ Cheap flights from Oakland, CA to Ontario (OAK - ONT)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/9. Fares are subject to change and may not be available on all flights or dates of travel.
OAK — ONT
Nov 1 — Nov 81
Round-trip
1 adult, Economy
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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 November or September, booked 90 days in advance, depart on a Thursday or Friday and return on a Saturday
Cheap flight deals from Oakland to Ontario
Cheapest
Best
Last-minute
One-way
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 October 2, 2026.
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 October 2, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2910:18 am -
1 stop6h 03m
Mon 11/22:23 pm -
1 stop21h 30m
Deal found 9/29![Frontier logo]()
$150
This Cheapflightsfares deal was found by Cheapflights users on 9/27. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2712:48 pm -
1 stop20h 52m
Tue 11/35:07 pm -
1 stop18h 46m
Deal found 9/27![Frontier logo]()
$153
This Cheapflightsfares deal was found by Cheapflights users on 9/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/612:28 pm -
1 stop23h 23m
Fri 12/112:41 pm -
1 stop20h 52m
Deal found 9/30![Frontier logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 9/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2112:47 pm -
2 stops30h 53m
Mon 10/268:35 pm -
1 stop15h 18m
Deal found 9/30![Frontier logo]()
$160
This Frontier deal was found by Cheapflights users on 9/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1412:48 pm -
1 stop3h 33m
Sat 11/212:01 pm -
1 stop5h 56m
Deal found 9/29![Frontier logo]()
$164
This Cheapflightsfares deal was found by Cheapflights users on 9/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2812:48 pm -
1 stop22h 28m
Wed 11/45:07 pm -
1 stop16h 16m
Deal found 9/30![Frontier logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 9/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/412:48 pm -
2 stops30h 40m
Tue 11/105:07 pm -
1 stop18h 46m
Deal found 9/29![Frontier logo]()
$166
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2712:48 pm -
1 stop3h 33m
Wed 10/285:07 pm -
1 stop16h 16m
Deal found 9/29![Frontier logo]()
$168
This Cheapflightsfares deal was found by Cheapflights users on 9/27. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/312:48 pm -
1 stop20h 52m
Fri 11/68:35 pm -
1 stop15h 18m
Deal found 9/27![Frontier logo]()
$171
This Cheapflightsfares deal was found by Cheapflights users on 9/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/255:20 pm -
1 stop13h 44m
Mon 10/268:35 pm -
1 stop15h 18m
Deal found 9/30![Frontier logo]()
$173
Best flights from Oakland to OntarioDiscover carefully curated flight deals from Oakland to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 2, 2026.
Discover carefully curated flight deals from Oakland to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 2, 2026.
This Southwest deal was found by Cheapflights users on 9/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/198:00 pm -
Nonstop1h 25m
Mon 11/235:30 pm -
Nonstop1h 20m
Deal found 9/28![Southwest logo]()
$257
This Southwest deal was found by Cheapflights users on 9/30. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/223:20 pm -
Nonstop1h 20m
Wed 11/46:55 pm -
Nonstop1h 30m
Deal found 9/30![Southwest logo]()
$257
This Southwest deal was found by Cheapflights users on 9/29. 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 10/278:20 am -
Nonstop1h 20m
Wed 10/286:40 pm -
Nonstop1h 15m
Deal found 9/29![Southwest logo]()
$257
This Southwest deal was found by Cheapflights users on 9/27. 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 10/2712:05 pm -
Nonstop1h 20m
Tue 11/36:35 am -
Nonstop1h 20m
Deal found 9/27![Southwest logo]()
$257
This Southwest deal was found by Cheapflights users on 9/27. 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.
Fri 11/67:00 am -
Nonstop1h 20m
Tue 11/106:35 am -
Nonstop1h 20m
Deal found 9/27![Southwest logo]()
$266
This Southwest deal was found by Cheapflights users on 10/1. 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.
Fri 10/236:20 am -
Nonstop1h 20m
Mon 10/2610:35 am -
Nonstop1h 15m
Deal found 10/1![Southwest logo]()
$266
This Southwest deal was found by Cheapflights users on 10/1. 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 11/43:00 pm -
Nonstop1h 15m
Wed 11/115:55 am -
1 stop4h 55m
Deal found 10/1![Southwest logo]()
$267
This Southwest deal was found by Cheapflights users on 9/27. 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 11/113:00 pm -
Nonstop1h 15m
Sun 11/155:00 am -
1 stop5h 25m
Deal found 9/27![Southwest logo]()
$318
Last-minute flights from Oakland to OntarioDiscover last-minute flight deals from Oakland to Ontario. Data last updated October 2, 2026 and is based on user searches.
Discover last-minute flight deals from Oakland to Ontario. Data last updated October 2, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2112:47 pm -
2 stops30h 53m
Mon 10/268:35 pm -
1 stop15h 18m
Deal found 9/30![Frontier logo]()
$160
This Cheapflightsfares deal was found by Cheapflights users on 9/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/255:20 pm -
1 stop13h 44m
Mon 10/268:35 pm -
1 stop15h 18m
Deal found 9/30![Frontier logo]()
$173
This Cheapflightsfares deal was found by Cheapflights users on 9/27. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2712:48 pm -
1 stop20h 52m
Tue 11/35:07 pm -
1 stop18h 46m
Deal found 9/27![Frontier logo]()
$153
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2712:48 pm -
1 stop3h 33m
Wed 10/285:07 pm -
1 stop16h 16m
Deal found 9/29![Frontier logo]()
$168
This Cheapflightsfares deal was found by Cheapflights users on 9/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2812:48 pm -
1 stop22h 28m
Wed 11/45:07 pm -
1 stop16h 16m
Deal found 9/30![Frontier logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 9/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2812:48 pm -
1 stop22h 28m
Mon 11/28:35 pm -
1 stop15h 18m
Deal found 9/27![Frontier logo]()
$177
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2910:18 am -
1 stop6h 03m
Mon 11/22:23 pm -
1 stop21h 30m
Deal found 9/29![Frontier logo]()
$150
This Cheapflightsfares deal was found by Cheapflights users on 9/27. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/312:48 pm -
1 stop20h 52m
Fri 11/68:35 pm -
1 stop15h 18m
Deal found 9/27![Frontier logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 9/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/412:48 pm -
2 stops30h 40m
Tue 11/105:07 pm -
1 stop18h 46m
Deal found 9/29![Frontier logo]()
$166
This Frontier deal was found by Cheapflights users on 9/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1412:48 pm -
1 stop3h 33m
Sat 11/212:01 pm -
1 stop5h 56m
Deal found 9/29![Frontier logo]()
$164
One-way flights from Oakland to OntarioSearch for one-way flight options from Oakland to Ontario. Find affordable one-way fares based on user searches. Data last updated October 2, 2026.
Search for one-way flight options from Oakland to Ontario. Find affordable one-way fares based on user searches. Data last updated October 2, 2026.
This Frontier deal was found by Cheapflights users on 9/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/912:28 pm -
1 stop6h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Frontier logo]()
$62
This deal was found by Cheapflights users on 9/27. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1012:47 pm -
1 stop3h 43m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$65
This Frontier deal was found by Cheapflights users on 9/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/312:48 pm -
1 stop3h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Frontier logo]()
$68
This Kiwi.com deal was found by Cheapflights users on 9/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/112:28 pm -
2 stops34h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Frontier logo]()
$69
This Kiwi.com deal was found by Cheapflights users on 10/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/412:48 pm -
2 stops30h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/1![Frontier logo]()
$76
This Cheapflightsfares deal was found by Cheapflights users on 9/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1012:48 pm -
1 stop3h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Frontier logo]()
$78
This Cheapflightsfares deal was found by Cheapflights users on 9/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/3011:24 am -
1 stop24h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Frontier logo]()
$83
This Trip.com deal was found by Cheapflights users on 9/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/210:18 am -
1 stop6h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Frontier logo]()
$84
This Jetabroad deal was found by Cheapflights users on 9/30. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2012:47 pm -
1 stop3h 43m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Frontier logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 9/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2712:48 pm -
1 stop20h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Frontier logo]()
$88
This Frontier deal was found by Cheapflights users on 9/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/3112:48 pm -
1 stop3h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Frontier logo]()
$89
Find 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 October 2, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $150 (Cheapflightsfares) |
One-way from | $62 (Frontier) |
Popular in | January |
Cheapest in | November |
Average price | $307 |
Good round-trip deal | $246 or less |
Good one-way deal | $118 or less |
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 7,457,451 searches. Data last updated October 2, 2026.
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
Cheapest round-trip
OaklandOntario
OAK Oakland - ONT Ontario
OAKONT
Oakland
Sat 10/10
12:47 pm-4:30 pm
1 stop3h 43m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$65
OaklandOntario
OAK Oakland - ONT Ontario
OAKONT
Oakland
Tue 11/10
8:00 pm-9:25 pm
Nonstop1h 25m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$129
Quickest round-trip
OaklandOntario
OAK Oakland - ONT Ontario
OAKONT
Oakland
Thu 10/29
10:40 am-12:00 pm
Nonstop1h 20m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$129
OaklandOntario
OAK Oakland - ONT Ontario
OAKONT
Oakland
Wed 10/28
12:05 pm-1:25 pm
Nonstop1h 20m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$129
OaklandOntario
OAK Oakland - ONT Ontario
OAKONT
Oakland
Wed 12/30
5:35 pm-11:55 pm
2 stops6h 20m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$144
OaklandOntario
OAK Oakland - ONT Ontario
OAKONT
Oakland
Tue 10/27
10:10 am-3:40 pm
2 stops5h 30m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$144
OaklandOntario
OAK Oakland - ONT Ontario
OAKONT
Oakland
Fri 10/30
6:25 pm-11:50 pm
2 stops5h 25m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$153
OaklandOntario
OAK Oakland - ONT Ontario
OAKONT
Oakland
Fri 11/27
1:25 pm-6:30 pm
2 stops5h 05m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$174
OaklandOntario
OAK Oakland - ONT Ontario
OAKONT
Oakland
Sun 11/15
4:30 pm-5:50 pm
Nonstop1h 20m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$180
OaklandOntario
OAK Oakland - ONT Ontario
OAKONT
Oakland
Sat 3/27
9:20 pm-10:40 pm
Nonstop1h 20m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$210
Showing 1-10 of 19 resultsSorted by cheapest first
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 October.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 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 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.
OAK-ONT
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?
To ensure you get the cheapest price possible for a flight from Oakland, California to Ontario, you should look to book at least 89 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, November is the cheapest month in which you can book a flight from Oakland, California to Ontario (average of $236). Flying from Oakland, California to Ontario in January is currently the most expensive (average of $411). 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 October 2, 2026.
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 11% on your trip compared to booking a flight in the afternoon.
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 September 26, 2026.
Travelers seeking maximum savings on their Oakland, California to Ontario flight should consider departing on Wednesday at noon when fares are most often at their lowest. Tuesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
The best insider tips for Oakland to Ontario flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Oakland to Ontario trip
Our travel experts
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 October 2, 2026.
Get a feel of what it's like to fly with Southwest and Frontier 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.
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Related info for your journey
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Top 2 airlines flying from Oakland to Ontario
Discover the top 2 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 7,457,451 searches. Data last updated October 2, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$39 | Average$168 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$199 | Average$319 | FlexibilityNo cancel fee | On-time63% |