HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$105+ Cheap flights from Oakland, CA (OAK) to Ontario

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 10/8. Fares are subject to change and may not be available on all flights or dates of travel.
OAK — YYZ
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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.

Cheap flight deals from Oakland to Ontario

Keep the following information in mind while searching for Oakland to Ontario flight deals. Data was last updated August 14, 2025.

Round-trip from

$265
(Kiwi.com)

One-way from

$105
(Trip.com)

Popular in

December

Cheapest in

April

Average price

$458
From Oakland to Ontario
Search Deals
One-way flight from Oakland to Ontario
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($62 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

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 August 14, 2025.

This Kiwi.com deal was found by Cheapflights users on 8/13. 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 10/26:30 amOAK - YYZ
1 stop10h 28mMultiple Airlines
Wed 10/89:30 amYYZ - OAK
1 stop15h 06mMultiple Airlines
Deal found 8/13$265
This Kiwi.com deal was found by Cheapflights users on 8/13. 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.
Wed 10/88:44 amOAK - YYZ
1 stop8h 14mMultiple Airlines
Tue 10/142:00 pmYYZ - OAK
2 stops20h 49mMultiple Airlines
Deal found 8/13$269
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 9/232:39 pmOAK - YYZ
1 stop26h 19mMultiple Airlines
Sat 10/42:00 pmYYZ - OAK
2 stops12h 32mMultiple Airlines
Deal found 8/13$270
This Kiwi.com deal was found by Cheapflights users on 8/13. 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.
Wed 10/16:30 amOAK - YYZ
1 stop10h 28mMultiple Airlines
Sun 10/53:00 pmYYZ - OAK
2 stops19h 49mMultiple Airlines
Deal found 8/13$277
This Mytrip deal was found by Cheapflights users on 8/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/116:30 amOAK - YYZ
1 stop10h 28mMultiple Airlines
Tue 9/169:30 amYYZ - OAK
1 stop17h 02mMultiple Airlines
Deal found 8/14$291
This Kiwi.com deal was found by Cheapflights users on 8/12. 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 9/266:30 amOAK - YYZ
1 stop10h 28mMultiple Airlines
Fri 10/32:00 pmYYZ - OAK
2 stops26h 34mMultiple Airlines
Deal found 8/12$292
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 10/98:44 amOAK - YYZ
1 stop8h 14mMultiple Airlines
Tue 10/142:00 pmYYZ - OAK
2 stops20h 49mMultiple Airlines
Deal found 8/13$293
This Kiwi.com deal was found by Cheapflights users on 8/13. 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.
Wed 9/246:30 amOAK - YYZ
1 stop10h 28mMultiple Airlines
Fri 9/2610:40 amYYZ - OAK
2 stops29h 54mMultiple Airlines
Deal found 8/13$294
This Kiwi.com deal was found by Cheapflights users on 8/12. 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.
Thu 9/116:30 amOAK - YYZ
1 stop10h 28mMultiple Airlines
Thu 9/1812:00 pmYYZ - OAK
2 stops14h 32mMultiple Airlines
Deal found 8/12$297
This Mytrip deal was found by Cheapflights users on 8/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/42:39 pmOAK - YTZ
2 stops18h 06mMultiple Airlines
Sun 9/75:25 pmYTZ - OAK
3 stops19h 36mMultiple Airlines
Deal found 8/13$341
This Mytrip deal was found by Cheapflights users on 8/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/116:30 amOAK - YUL
2 stops14h 57mMultiple Airlines
Tue 9/166:45 amYUL - OAK
2 stops19h 47mMultiple Airlines
Deal found 8/11$372
This Mytrip deal was found by Cheapflights users on 8/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/86:30 amOAK - YUL
3 stops15h 11mMultiple Airlines
Mon 9/158:10 amYUL - OAK
2 stops18h 22mMultiple Airlines
Deal found 8/14$387

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 August 14, 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

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Sat 10/11

8:44 am-7:45 pm

1 stop8h 01m

Toronto Pearson Intl

Sat 10/25

11:00 am-9:36 pm

2 stops13h 36m

$265

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Thu 10/2

6:30 am-7:58 pm

1 stop10h 28m

Toronto Pearson Intl

Wed 10/8

9:30 am-9:36 pm

1 stop15h 06m

$265

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Wed 10/8

8:44 am-7:58 pm

1 stop8h 14m

Toronto Pearson Intl

Tue 10/14

2:00 pm-7:49 am

2 stops20h 49m

$269

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Tue 9/23

2:39 pm-7:58 pm

1 stop26h 19m

Toronto Pearson Intl

Sat 10/4

2:00 pm-11:32 pm

2 stops12h 32m

$270

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Wed 10/1

6:30 am-7:58 pm

1 stop10h 28m

Toronto Pearson Intl

Sun 10/5

3:00 pm-7:49 am

2 stops19h 49m

$277

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Fri 9/26

6:30 am-7:58 pm

1 stop10h 28m

Toronto Pearson Intl

Fri 10/3

2:00 pm-1:34 pm

2 stops26h 34m

$291

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Thu 9/11

6:30 am-7:58 pm

1 stop10h 28m

Toronto Pearson Intl

Tue 9/16

9:30 am-11:32 pm

1 stop17h 02m

$291

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Thu 10/9

8:44 am-7:58 pm

1 stop8h 14m

Toronto Pearson Intl

Tue 10/14

2:00 pm-7:49 am

2 stops20h 49m

$293

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Wed 9/24

6:30 am-7:58 pm

1 stop10h 28m

Toronto Pearson Intl

Fri 9/26

10:40 am-1:34 pm

2 stops29h 54m

$294

OaklandToronto

OAK - YTZ

OAKYTZ

Oakland

Thu 9/4

2:39 pm-11:45 am

2 stops18h 06m

Toronto Island

Sun 9/7

5:25 pm-10:01 am

3 stops19h 36m

$341

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 55 results
1
2
3
...
6

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

What is the cheapest month to book a flight from Oakland, California to Region of Ontario?

Currently, January is the cheapest month in which you can book a flight from Oakland, California to Region of Ontario (average of $243). Flying from Oakland, California to Region of Ontario in August is currently the most expensive (average of $348). 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 ON?

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 August 14, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Oakland, California to Region of Ontario as you normally would.

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 August 14, 2025.
Peruse reviews from past customers who have flown with Delta from Oakland to Ontario to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,980 reviews

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,980 reviews
Delta
8.0
Very good
7,980 reviews

Crew

8.5

Comfort

7.9

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 airport do you fly from for flights from Oakland to Ontario?

    For a flight from Oakland to Ontario, you will be flying from Oakland. Oakland (OAK) is just 7.0 mi from the center of the city.

  • What are the most popular routes from Oakland, California to Region of Ontario?

    The most popular route from Oakland, California to Region of Ontario is Oakland - Toronto Pearson Intl. You may also consider Oakland - Montreal Pierre Elliott Trudeau Intl or Oakland - Hamilton.

  • 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 Region of Ontario?

    Currently, January is the cheapest month in which you can book a flight from Oakland, California to Region of Ontario (average of $243). Flying from Oakland, California to Region of Ontario in August is currently the most expensive (average of $348). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Oakland to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
San Francisco to Vancouver Intl flights
Los Angeles to Vancouver Intl flights
San Francisco to Pearson Intl flights
Los Angeles to Pearson Intl flights
Los Angeles to Calgary flights
Ontario to Vancouver Intl flights
San Francisco to Abbotsford flights
Los Angeles to Pierre Elliott Trudeau Intl flights
Santa Ana to Vancouver Intl flights
San Francisco to Calgary flights
Los Angeles to Abbotsford flights
Santa Ana to Calgary flights
San Francisco to Pierre Elliott Trudeau Intl flights
Ontario to Calgary flights
Las Vegas to Vancouver Intl flights
Los Angeles to Toronto Island flights
San Diego to Vancouver Intl flights
Sacramento to Vancouver Intl flights
San Jose to Vancouver Intl flights
San Francisco to Toronto Island flights
Burbank to Calgary flights
Oakland to Vancouver Intl flights
San Jose to Pearson Intl flights
Long Beach to Calgary flights
Santa Ana to Pearson Intl flights
Ontario to Pearson Intl flights
San Francisco to Hamilton flights
Oakland to Pearson Intl flights
San Diego to Pearson Intl flights
Burbank to Vancouver Intl flights
Los Angeles to Hamilton flights
San Francisco to Region of Waterloo Intl flights
Sacramento to Pearson Intl flights
San Francisco to Edmonton flights
Las Vegas to Pierre Elliott Trudeau Intl flights
Las Vegas to Abbotsford flights
San Diego to Calgary flights
Los Angeles to Edmonton flights
Sacramento to Calgary flights
Las Vegas to Pearson Intl flights
Palm Springs to Vancouver Intl flights
San Francisco to Victoria flights
Los Angeles to Region of Waterloo Intl flights
San Diego to Pierre Elliott Trudeau Intl flights
Burbank to Pearson Intl flights
San Jose to Calgary flights
Monterey to Vancouver Intl flights
Ontario to Pierre Elliott Trudeau Intl flights
Sacramento to Abbotsford flights
Las Vegas to Calgary flights

Top airline flying from Oakland to Ontario

Discover the top airline 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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$456Average$568FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.