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$212+ 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 5/15. Fares are subject to change and may not be available on all flights or dates of travel.
OAK — YYZ
Dec 24 — Dec 311
Wed 12/24
Wed 12/31
1 adult, Economy
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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 November 24, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$347
(Alaska Airlines)

One-way from

$212
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$474
Provider with most accurate pricing for San Francisco-Toronto (YTO) flight deals.
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Provider most trusted by Cheapflights users for San Francisco-Toronto (YTO) flights.
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From Oakland to Ontario
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One-way flight from Oakland to Ontario
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Highest demand for flights based on searches. 11% potential increase in price ($55 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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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 November 24, 2025.

This Delta deal was found by Cheapflights users on 11/22. 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.
Tue 12/164:50 pmOAK - YYZ
2 stops15h 17mDelta
Thu 1/86:10 amYYZ - OAK
2 stops19h 43mDelta
Deal found 11/22$491
This Alaska Airlines deal was found by Cheapflights users on 11/23. 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 12/246:10 amOAK - YYZ
1 stop30h 25mAlaska Airlines
Fri 1/94:45 pmYYZ - OAK
1 stop26h 43mAlaska Airlines
Deal found 11/23$497
This Alaska Airlines deal was found by Cheapflights users on 11/23. 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 12/246:10 amOAK - YYZ
1 stop30h 25mAlaska Airlines
Thu 1/84:45 pmYYZ - OAK
1 stop30h 55mAlaska Airlines
Deal found 11/23$518
This Delta deal was found by Cheapflights users on 11/23. 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.
Thu 12/185:55 amOAK - YYZ
2 stops14h 16mDelta
Thu 1/86:10 amYYZ - OAK
2 stops19h 43mDelta
Deal found 11/23$526
This Alaska Airlines deal was found by Cheapflights users on 11/22. 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 12/79:26 amOAK - YYZ
2 stops27h 09mAlaska Airlines
Sun 12/144:45 pmYYZ - OAK
1 stop34h 14mAlaska Airlines
Deal found 11/22$540
This Alaska Airlines deal was found by Cheapflights users on 11/23. 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 12/246:10 amOAK - YYZ
1 stop30h 25mAlaska Airlines
Wed 1/74:45 pmYYZ - OAK
1 stop26h 38mAlaska Airlines
Deal found 11/23$555
This Delta deal was found by Cheapflights users on 11/22. 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 12/195:55 amOAK - YYZ
2 stops15h 04mDelta
Fri 1/96:10 amYYZ - OAK
2 stops19h 43mDelta
Deal found 11/22$558
This Delta deal was found by Cheapflights users on 11/23. 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.
Thu 12/185:55 amOAK - YYZ
2 stops14h 16mDelta
Sat 1/106:10 amYYZ - OAK
2 stops18h 28mDelta
Deal found 11/23$562
This Mytrip deal was found by Cheapflights users on 11/23. 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 12/47:33 pmOAK - YOW
2 stops26h 09mMultiple Airlines
Thu 12/116:55 pmYOW - OAK
2 stops29h 35mMultiple Airlines
Deal found 11/23$1,053
This Delta deal was found by Cheapflights users on 11/23. 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 12/195:55 amOAK - YUL
2 stops15h 04mDelta
Mon 12/2912:50 pmYUL - OAK
2 stops30h 14mDelta
Deal found 11/23$1,156
This Delta deal was found by Cheapflights users on 11/23. 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 12/195:55 amOAK - YUL
2 stops15h 04mDelta
Tue 12/307:00 amYUL - OAK
2 stops31h 54mDelta
Deal found 11/23$1,260
This Delta deal was found by Cheapflights users on 11/23. 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.
Wed 12/2412:34 pmOAK - YUL
2 stops32h 25mDelta
Tue 12/307:00 amYUL - OAK
2 stops19h 58mDelta
Deal found 11/23$1,274

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 November 24, 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

Tue 1/6

3:01 pm-3:35 pm

1 stop21h 34m

Toronto Pearson Intl

Tue 1/13

4:45 pm-10:28 am

1 stop20h 43m

$347

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Sat 2/21

6:15 am-3:35 pm

1 stop30h 20m

Toronto Pearson Intl

Tue 2/24

4:45 pm-4:37 pm

1 stop26h 52m

$355

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Wed 1/7

8:10 am-3:35 pm

1 stop28h 25m

Toronto Pearson Intl

Wed 1/14

4:45 pm-7:23 pm

2 stops29h 38m

$382

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Sat 3/21

7:54 pm-3:35 pm

1 stop16h 41m

Toronto Pearson Intl

Tue 3/24

4:45 pm-11:39 pm

1 stop9h 54m

$476

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Wed 12/24

6:10 am-3:35 pm

1 stop30h 25m

Toronto Pearson Intl

Fri 1/9

4:45 pm-4:28 pm

1 stop26h 43m

$497

OaklandToronto

OAK - YTZ

OAKYTZ

Oakland

Sat 3/21

11:59 pm-6:57 pm

2 stops15h 58m

Toronto Island

Tue 3/24

7:00 am-7:56 pm

3 stops39h 56m

$777

OaklandMontreal

OAK - YUL

OAKYUL

Oakland

Sat 2/21

5:55 am-1:40 pm

2 stops28h 45m

Montreal Pierre Elliott Trudeau Intl

Tue 2/24

7:00 am-11:51 pm

2 stops19h 51m

$825

OaklandMontreal

OAK - YUL

OAKYUL

Oakland

Wed 1/7

12:38 pm-7:05 am

2 stops15h 27m

Montreal Pierre Elliott Trudeau Intl

Wed 1/14

7:00 am-10:53 pm

2 stops18h 53m

$829

OaklandMontreal

OAK - YUL

OAKYUL

Oakland

Wed 1/7

11:17 pm-7:00 am

1 stop28h 43m

Montreal Pierre Elliott Trudeau Intl

Wed 1/14

6:45 am-4:23 pm

2 stops36h 38m

$874

OaklandHamilton

OAK - YHM

OAKYHM

Oakland

Thu 1/8

8:10 am-1:22 pm

2 stops26h 12m

Hamilton

Thu 1/15

6:10 pm-4:28 pm

2 stops49h 18m

$912

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/22

Showing 1-10 of 49 results
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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, February is the cheapest month in which you can book a flight from Oakland, California to Region of Ontario (average of $127). Flying from Oakland, California to Region of Ontario in August is currently the most expensive (average of $203). 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 November 24, 2025.

It’s optimal to fly from Oakland, California to Region of Ontario at noon. By choosing this option you can save up to 23% on the cost of your flight, compared to a flight in the morning.

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.

  • How long is the flight from Oakland, California to Region of Ontario?

    Airlines like Alaska Airlines and Delta fly from Oakland, California to Region of Ontario in about 21h 34m. The time it takes to get you to your destination can typically vary by up to 7h 11m. The distance from Oakland, California to Region of Ontario is about 2243 mi. This flight may include one or multiple stops.

  • 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 - Toronto Island.

  • 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, February is the cheapest month in which you can book a flight from Oakland, California to Region of Ontario (average of $127). Flying from Oakland, California to Region of Ontario in August is currently the most expensive (average of $203). 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

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