HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$65+ 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 6/12. Fares are subject to change and may not be available on all flights or dates of travel.
OAK — YYZ
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
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 April 17, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$181
(Kiwi.com)

One-way from

$65
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$375
Provider with most accurate pricing for San Francisco-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Francisco-Toronto (YTO) flights.
Search Deals
From Oakland to Ontario
Search Deals
One-way flight from Oakland to Ontario
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($41 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 17, 2025.

This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/45:45 amOAK - YYZ
1 stop11h 14mMultiple Airlines
Tue 6/1011:00 amYYZ - OAK
2 stops14h 25mMultiple Airlines
Deal found 4/17$181
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/129:38 pmOAK - YHM
3 stops24h 03mMultiple Airlines
Mon 6/166:00 amYHM - OAK
3 stops20h 26mMultiple Airlines
Deal found 4/16$257
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/25:45 amOAK - YOW
3 stops33h 36mMultiple Airlines
Mon 6/97:50 amYOW - OAK
3 stops30h 06mMultiple Airlines
Deal found 4/17$338
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/811:51 amOAK - YUL
3 stops33h 52mMultiple Airlines
Wed 6/183:10 pmYUL - OAK
2 stops27h 45mMultiple Airlines
Deal found 4/17$346
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/711:51 amOAK - YTZ
2 stops19h 44mMultiple Airlines
Sat 6/149:45 amYTZ - OAK
2 stops16h 41mMultiple Airlines
Deal found 4/16$436
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/76:00 amOAK - YYZ
1 stop7h 40mDelta
Tue 6/105:50 pmYYZ - OAK
1 stop9h 07mDelta
Deal found 4/17$448
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/17:00 amOAK - YYZ
1 stop29h 00mAlaska Airlines
Tue 6/104:45 pmYYZ - OAK
1 stop8h 26mAlaska Airlines
Deal found 4/17$459
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/66:00 amOAK - YUL
2 stops28h 41mDelta
Tue 6/176:45 pmYUL - OAK
2 stops32h 12mDelta
Deal found 4/17$495

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

Oakland

Fly to

Ontario

Route

Depart

Return

Price

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Wed 6/4

5:45 am-7:59 pm

1 stop11h 14m

Toronto Pearson Intl

Tue 6/10

11:00 am-10:25 pm

2 stops14h 25m

$181

OaklandHamilton

OAK - YHM

OAKYHM

Oakland

Thu 6/12

9:38 pm-12:41 am

3 stops24h 03m

Hamilton

Mon 6/16

6:00 am-11:26 pm

3 stops20h 26m

$257

OaklandOttawa

OAK - YOW

OAKYOW

Oakland

Mon 6/2

5:45 am-6:21 pm

3 stops33h 36m

Ottawa

Mon 6/9

7:50 am-10:56 am

3 stops30h 06m

$338

OaklandMontreal

OAK - YUL

OAKYUL

Oakland

Sun 6/8

11:51 am-12:43 am

3 stops33h 52m

Montreal Pierre Elliott Trudeau Intl

Wed 6/18

3:10 pm-3:55 pm

2 stops27h 45m

$346

OaklandToronto

OAK - YTZ

OAKYTZ

Oakland

Sat 6/7

11:51 am-10:35 am

2 stops19h 44m

Toronto Island

Sat 6/14

9:45 am-11:26 pm

2 stops16h 41m

$436

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Sat 6/7

6:00 am-4:40 pm

1 stop7h 40m

Toronto Pearson Intl

Tue 6/10

5:50 pm-11:57 pm

1 stop9h 07m

$448

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Sun 6/1

7:00 am-3:00 pm

1 stop29h 00m

Toronto Pearson Intl

Tue 6/10

4:45 pm-10:11 pm

1 stop8h 26m

$459

OaklandMontreal

OAK - YUL

OAKYUL

Oakland

Fri 6/6

6:00 am-1:41 pm

2 stops28h 41m

Montreal Pierre Elliott Trudeau Intl

Tue 6/17

6:45 pm-11:57 pm

2 stops32h 12m

$495

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Thu 6/12

9:38 pm-12:24 am

3 stops23h 46m

$65

OaklandMontreal

OAK - YUL

OAKYUL

Oakland

Thu 5/1

9:57 am-7:57 pm

2 stops31h 00m

$168

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

Showing 1-10 of 15 results
1
2

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 July is currently the most expensive (average of $359). 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 April 17, 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.

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 Region of Ontario ranges from 2.0 - 3.3 inches per month. June is typically the wettest month, when rainfall can reach 3.3 in. February is typically the driest time to visit Region of Ontario when rainfall is around 2.0 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 Region of Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.2 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 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
9,887 reviews

Entertainment

7.1

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,887 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Entertainment

7.1

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,916 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Entertainment

7.1

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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 July is currently the most expensive (average of $359). 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.
Los Angeles to Vancouver Intl flights
San Francisco to Vancouver Intl flights
Los Angeles to Pearson Intl flights
San Francisco to Pearson Intl flights
Los Angeles to Calgary flights
San Diego to Vancouver Intl flights
San Francisco to Calgary flights
Ontario to Vancouver Intl flights
San Francisco to Pierre Elliott Trudeau Intl flights
Los Angeles to Abbotsford flights
Los Angeles to Pierre Elliott Trudeau Intl flights
Santa Ana to Vancouver Intl flights
San Francisco to Abbotsford flights
Sacramento to Vancouver Intl flights
San Diego to Pearson Intl flights
San Diego to Calgary flights
Los Angeles to Edmonton flights
Las Vegas to Vancouver Intl flights
Los Angeles to Toronto Island flights
Ontario to Pearson Intl flights
San Francisco to Region of Waterloo Intl flights
San Francisco to Toronto Island flights
Ontario to Calgary flights
Las Vegas to Pearson Intl flights
San Francisco to Edmonton flights
San Francisco to Hamilton flights
Santa Ana to Calgary flights
Palm Springs to Vancouver Intl flights
Oakland to Vancouver Intl flights
Los Angeles to Region of Waterloo Intl flights
Sacramento to Pearson Intl flights
Burbank to Vancouver Intl flights
Oakland to Pearson Intl flights
San Diego to Abbotsford flights
San Jose to Vancouver Intl flights
Los Angeles to Hamilton flights
San Jose to Pearson Intl flights
Las Vegas to Calgary flights
Ontario to Pierre Elliott Trudeau Intl flights
Los Angeles to Winnipeg flights
Los Angeles to Victoria flights
Santa Ana to Pearson Intl flights
San Diego to Pierre Elliott Trudeau Intl flights
Las Vegas to Pierre Elliott Trudeau Intl flights
Fresno to Vancouver Intl flights
Palm Springs to Calgary flights
San Francisco to Ottawa flights
Burbank to Calgary flights
San Diego to Toronto Island flights
Los Angeles to Québec City 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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$485Average$648FlexibilityNo 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.