$72+ Cheap flights from Ontario to Oakland, CA (ONT - OAK)
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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — OAK
Oct 17 — Oct 241
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Oakland 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 Ontario to Oakland are usually found in September or December, booked 69 days in advance, depart on a Thursday or Saturday and return on a Thursday
Cheap flight deals from Ontario to Oakland
Cheapest
Best
Last-minute
One-way
Cheapest flights from Ontario to OaklandExplore the most affordable flight options available from Ontario to Oakland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.
Explore the most affordable flight options available from Ontario to Oakland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/65:44 pm -
1 stop18h 07m
Tue 10/1312:47 pm -
1 stop21h 44m
Deal found 9/15![Frontier logo]()
$143
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Mon 10/262:28 pm -
1 stop21h 25m
Thu 10/2910:18 am -
1 stop6h 03m
Deal found 9/14![Frontier logo]()
$146
This Kiwi.com deal was found by Cheapflights users on 9/12. 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.
Fri 10/308:35 pm -
1 stop15h 18m
Mon 11/210:18 am -
1 stop6h 03m
Deal found 9/12![Frontier logo]()
$167
This Kiwi.com deal was found by Cheapflights users on 9/12. 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.
Fri 10/28:00 am -
1 stop9h 56m
Sun 10/46:51 pm -
1 stop12h 13m
Deal found 9/12![Frontier logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/88:35 pm -
1 stop12h 30m
Sun 10/115:20 pm -
1 stop13h 44m
Deal found 9/13![Frontier logo]()
$176
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:26 am -
1 stop24h 26m
Tue 10/2012:47 pm -
1 stop27h 43m
Deal found 9/13![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/105:25 pm -
1 stop15h 57m
Mon 10/125:20 pm -
1 stop17h 11m
Deal found 9/13![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1010:04 am -
1 stop23h 18m
Sun 10/115:20 pm -
1 stop17h 56m
Deal found 9/13![Frontier logo]()
$182
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/228:35 pm -
1 stop12h 30m
Mon 10/265:20 pm -
1 stop23h 01m
Deal found 9/15![Frontier logo]()
$193
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/75:07 pm -
1 stop16h 16m
Mon 11/910:18 am -
1 stop6h 03m
Deal found 9/13![Frontier logo]()
$195
This Frontier deal was found by Cheapflights users on 9/14. 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.
Thu 11/261:36 pm -
Nonstop1h 20m
Sat 11/288:42 pm -
Nonstop1h 17m
Deal found 9/14![Frontier logo]()
$199
Best flights from Ontario to OaklandDiscover carefully curated flight deals from Ontario to Oakland that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.
Discover carefully curated flight deals from Ontario to Oakland that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.
This Southwest deal was found by Cheapflights users on 9/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/64:15 pm -
Nonstop1h 15m
Tue 10/135:35 am -
1 stop5h 10m
Deal found 9/15![Southwest logo]()
$238
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/287:25 am -
1 stop12h 12m
Sat 10/318:10 am -
1 stop12h 05m
Deal found 9/15![Alaska Airlines logo]()
$383
This Southwest deal was found by Cheapflights users on 9/13. 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 10/292:50 pm -
1 stop7h 45m
Mon 11/21:25 pm -
2 stops5h 05m
Deal found 9/13![Southwest logo]()
$286
This Southwest deal was found by Cheapflights users on 9/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/410:25 am -
Nonstop1h 20m
Sun 12/61:25 pm -
2 stops5h 05m
Deal found 9/16![Southwest logo]()
$342
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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.
Wed 10/147:25 am -
1 stop8h 59m
Sat 10/177:02 am -
2 stops10h 03m
Deal found 9/13![Alaska Airlines logo]()
$423
This Southwest deal was found by Cheapflights users on 9/13. 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.
Sun 1/1010:05 am -
2 stops8h 45m
Tue 1/125:40 pm -
1 stop3h 10m
Deal found 9/13![Southwest logo]()
$350
This Southwest deal was found by Cheapflights users on 9/12. 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 11/256:10 am -
Nonstop1h 25m
Sat 11/286:05 pm -
Nonstop1h 20m
Deal found 9/12![Southwest logo]()
$359
This Southwest deal was found by Cheapflights users on 9/12. 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.
Sat 10/176:05 am -
Nonstop1h 20m
Mon 10/193:20 pm -
Nonstop1h 20m
Deal found 9/12![Southwest logo]()
$359
This Southwest deal was found by Cheapflights users on 9/14. 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.
Sat 12/264:05 pm -
Nonstop1h 25m
Wed 12/304:10 pm -
1 stop4h 30m
Deal found 9/14![Southwest logo]()
$369
This Southwest deal was found by Cheapflights users on 9/12. 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 11/261:05 pm -
Nonstop1h 20m
Mon 11/3011:05 am -
Nonstop1h 20m
Deal found 9/12![Southwest logo]()
$389
This Southwest deal was found by Cheapflights users on 9/14. 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 12/186:30 pm -
1 stop4h 50m
Sat 12/195:50 am -
Nonstop1h 20m
Deal found 9/14![Southwest logo]()
$429
Last-minute flights from Ontario to OaklandDiscover last-minute flight deals from Ontario to Oakland. Data last updated September 17, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Oakland. Data last updated September 17, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/12. 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.
Fri 10/28:00 am -
1 stop9h 56m
Sun 10/46:51 pm -
1 stop12h 13m
Deal found 9/12![Frontier logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/65:44 pm -
1 stop18h 07m
Tue 10/1312:47 pm -
1 stop21h 44m
Deal found 9/15![Frontier logo]()
$143
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/88:35 pm -
1 stop12h 30m
Sun 10/115:20 pm -
1 stop13h 44m
Deal found 9/13![Frontier logo]()
$176
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/105:25 pm -
1 stop15h 57m
Mon 10/125:20 pm -
1 stop17h 11m
Deal found 9/13![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1010:04 am -
1 stop23h 18m
Sun 10/115:20 pm -
1 stop17h 56m
Deal found 9/13![Frontier logo]()
$182
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:26 am -
1 stop24h 26m
Tue 10/2012:47 pm -
1 stop27h 43m
Deal found 9/13![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:26 am -
1 stop24h 26m
Sat 10/2412:47 pm -
1 stop22h 29m
Deal found 9/15![Frontier logo]()
$200
This Southwest deal was found by Cheapflights users on 9/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/146:40 am -
Nonstop1h 15m
Wed 10/215:15 pm -
Nonstop1h 20m
Deal found 9/16![Southwest logo]()
$210
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/228:35 pm -
1 stop12h 30m
Mon 10/265:20 pm -
1 stop23h 01m
Deal found 9/15![Frontier logo]()
$193
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Mon 10/262:28 pm -
1 stop21h 25m
Thu 10/2910:18 am -
1 stop6h 03m
Deal found 9/14![Frontier logo]()
$146
This Kiwi.com deal was found by Cheapflights users on 9/12. 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.
Fri 10/308:35 pm -
1 stop15h 18m
Mon 11/210:18 am -
1 stop6h 03m
Deal found 9/12![Frontier logo]()
$167
One-way flights from Ontario to OaklandSearch for one-way flight options from Ontario to Oakland. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
Search for one-way flight options from Ontario to Oakland. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
This Trip.com deal was found by Cheapflights users on 9/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2011:26 am -
1 stop24h 26m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$72
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/268:35 pm -
1 stop15h 18m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$76
This Trip.com deal was found by Cheapflights users on 9/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1010:04 am -
1 stop23h 18m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$79
This Trip.com deal was found by Cheapflights users on 9/13. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/135:25 pm -
1 stop18h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Frontier logo]()
$87
This Kiwi.com deal was found by Cheapflights users on 9/12. 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.
Mon 10/198:35 pm -
1 stop15h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![Frontier logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 10/145:25 pm -
1 stop15h 57m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![Frontier logo]()
$89
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/98:35 pm -
1 stop15h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Frontier logo]()
$91
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/98:35 pm -
1 stop15h 18m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Frontier logo]()
$93
This Southwest deal was found by Cheapflights users on 9/13. 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.
Tue 10/1310:15 am -
Nonstop1h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Southwest logo]()
$96
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/138:35 pm -
1 stop15h 18m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$100
This Southwest deal was found by Cheapflights users on 9/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/155:00 pm -
1 stop4h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Southwest logo]()
$106
Find flight deals from Ontario to Oakland
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Oakland (OAK). 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 September 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $143 (Kiwi.com) |
One-way from | $72 (Trip.com) |
Popular in | July |
Cheapest in | September |
Average price | $254 |
Good round-trip deal | $237 or less |
Good one-way deal | $128 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Oakland 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 September 17, 2026.
Use the filters below to find and compare flights from Ontario to Oakland that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
OntarioOakland
ONT Ontario - OAK Oakland
ONTOAK
Ontario
Sat 10/31
2:30 pm-3:45 pm
Nonstop1h 15m
Oakland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$114
OntarioOakland
ONT Ontario - OAK Oakland
ONTOAK
Ontario
Sun 11/15
5:30 pm-6:50 pm
Nonstop1h 20m
Oakland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$180
OntarioOakland
ONT Ontario - OAK Oakland
ONTOAK
Ontario
Fri 12/11
1:35 pm-3:00 pm
Nonstop1h 25m
Oakland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$180
OntarioOakland
ONT Ontario - OAK Oakland
ONTOAK
Ontario
Sat 12/12
7:20 am-8:45 am
Nonstop1h 25m
Oakland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$180
OntarioOakland
ONT Ontario - OAK Oakland
ONTOAK
Ontario
Sun 10/11
9:10 pm-10:30 pm
Nonstop1h 20m
Oakland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$180
OntarioOakland
ONT Ontario - OAK Oakland
ONTOAK
Ontario
Sun 12/13
5:45 am-7:10 am
Nonstop1h 25m
Oakland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$180
OntarioOakland
ONT Ontario - OAK Oakland
ONTOAK
Ontario
Sat 10/17
5:30 am-11:00 am
2 stops5h 30m
Oakland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$195
OntarioOakland
ONT Ontario - OAK Oakland
ONTOAK
Ontario
Sat 10/17
6:02 am-7:37 pm
2 stops13h 35m
Oakland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$203
OntarioOakland
ONT Ontario - OAK Oakland
ONTOAK
Ontario
Fri 11/13
4:09 pm-12:54 pm
1 stop20h 45m
Oakland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$237
OntarioOakland
ONT Ontario - OAK Oakland
ONTOAK
Ontario
Fri 12/4
5:01 pm-7:12 pm
1 stop26h 11m
Oakland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$237
Showing 1-10 of 22 resultsSorted by cheapest first
Compare providers for flights from Ontario to Oakland
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 Ontario to Oakland in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Ontario-Oakland, California flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Oakland, California flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Oakland, California flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-Oakland, California 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 Ontario-Oakland, California 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 Ontario to Oakland
Have a flexible travel schedule? Discover the best time to fly to Oakland from Ontario with our price prediction graph.
ONT-OAK
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 Ontario to Oakland
How far ahead should I book a flight from Ontario to Oakland, California?
The price you pay for your flight from Ontario to Oakland, California may vary depending on when you book. For the best chance of a lower fare, look to book 68 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Ontario to Oakland, California?
Currently, September is the cheapest month in which you can book a flight from Ontario to Oakland, California (average of $254). Flying from Ontario to Oakland, California in July is currently the most expensive (average of $349). 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 ONT to OAK?
Find hourly flight availability from Ontario to Oakland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 22% on flights from Ontario to Oakland, California by exploring options for tickets at noon.
What is the cheapest day to fly from Ontario to Oakland, California?
Use this chart to determine the cheapest time to fly round-trip from Ontario to Oakland. Price data was last updated on September 12, 2026.
Travelers seeking maximum savings on their Ontario to Oakland, California flight should consider departing on Saturday at noon when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
The best insider tips for Ontario to Oakland 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 Ontario to Oakland trip
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Reviews of airlines servicing Oakland
Get insights into the airlines that provide service to Oakland. 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 Oakland. Reviews last updated September 17, 2026.
Peruse reviews from past customers who have flown with Southwest and Frontier from Ontario to Oakland to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Related info for your journey
Find useful and relevant information for your journey from Ontario to Oakland. 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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Other flights to Oakland
Explore flights to Oakland departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 17, 2026.
Ontario and Oakland flights
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Top 2 airlines flying from Ontario to Oakland
Discover the top 2 airlines that operate flights from Ontario to Oakland. 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 September 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$46 | Average$130 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$188 | Average$300 | FlexibilityNo cancel fee | On-time63% |