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$165+ 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 3/11. Fares are subject to change and may not be available on all flights or dates of travel.
OAK — YYZ
Mar 16 — Mar 231
Mon 3/16
Mon 3/23
1 adult, Economy
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Cheap 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 February 14, 2026.

This CheapOair deal was found by Cheapflights users on 2/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/59:33 am
OAK
-
YYZ
2 stops27h 12m
Alaska Airlines
Tue 5/124:55 pm
YYZ
-
OAK
1 stop22h 11m
Alaska Airlines
Deal found 2/13$390
This CheapOair deal was found by Cheapflights users on 2/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:15 am
OAK
-
YYZ
1 stop30h 20m
Alaska Airlines
Mon 3/94:45 pm
YYZ
-
OAK
2 stops19h 39m
Alaska Airlines
Deal found 2/10$400
This Alaska Airlines deal was found by Cheapflights users on 2/10. 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.
Fri 4/246:20 am
OAK
-
YYZ
1 stop30h 25m
Alaska Airlines
Tue 5/54:55 pm
YYZ
-
OAK
1 stop19h 18m
Alaska Airlines
Deal found 2/10$403
This CheapOair deal was found by Cheapflights users on 2/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:15 am
OAK
-
YYZ
1 stop30h 20m
Alaska Airlines
Sun 3/84:45 pm
YYZ
-
OAK
1 stop34h 13m
Alaska Airlines
Deal found 2/12$410
This Alaska Airlines deal was found by Cheapflights users on 2/13. 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.
Fri 3/66:15 am
OAK
-
YYZ
1 stop30h 20m
Alaska Airlines
Wed 3/114:45 pm
YYZ
-
OAK
2 stops19h 39m
Alaska Airlines
Deal found 2/13$413
This CheapOair deal was found by Cheapflights users on 2/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/187:00 am
OAK
-
YYZ
1 stop29h 35m
Alaska Airlines
Wed 4/84:55 pm
YYZ
-
OAK
1 stop9h 48m
Alaska Airlines
Deal found 2/11$416
This Alaska Airlines deal was found by Cheapflights users on 2/10. 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.
Sat 4/252:09 pm
OAK
-
YYZ
1 stop22h 36m
Alaska Airlines
Tue 5/54:55 pm
YYZ
-
OAK
1 stop8h 37m
Alaska Airlines
Deal found 2/10$419
This CheapOair deal was found by Cheapflights users on 2/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/256:46 am
OAK
-
YYZ
2 stops29h 59m
Alaska Airlines
Mon 5/114:55 pm
YYZ
-
OAK
1 stop8h 37m
Alaska Airlines
Deal found 2/10$425
This CheapOair deal was found by Cheapflights users on 2/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/118:10 pm
OAK
-
YYZ
2 stops16h 35m
Alaska Airlines
Sat 5/164:55 pm
YYZ
-
OAK
1 stop9h 59m
Alaska Airlines
Deal found 2/13$426
This CheapOair deal was found by Cheapflights users on 2/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/166:15 am
OAK
-
YYZ
1 stop30h 20m
Alaska Airlines
Thu 3/264:45 pm
YYZ
-
OAK
1 stop33h 58m
Alaska Airlines
Deal found 2/11$430
This Delta deal was found by Cheapflights users on 2/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/3112:35 pm
OAK
-
YUL
2 stops20h 02m
Delta
Mon 4/67:00 am
YUL
-
OAK
2 stops19h 46m
Delta
Deal found 2/12$504
This Delta deal was found by Cheapflights users on 2/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/3112:35 pm
OAK
-
YUL
2 stops20h 02m
Delta
Sat 4/47:00 am
YUL
-
OAK
2 stops17h 43m
Delta
Deal found 2/12$574

Find flight deals from Oakland to Ontario

Keep the following information in mind while searching for Oakland to Ontario flight deals. Data was last updated February 14, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$390
(CheapOair)

One-way from

$165
(CheapOair)

Popular in

December

Cheapest in

March

Average price

$365
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. 11% potential increase in price ($57 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

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 February 14, 2026.
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

Fri 4/24

6:20 am-3:45 pm

1 stop30h 25m

Toronto Pearson Intl

Tue 5/5

4:55 pm-8:53 am

2 stops18h 58m

$400

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Fri 3/6

6:15 am-3:35 pm

1 stop30h 20m

Toronto Pearson Intl

Mon 3/9

4:45 pm-9:24 am

2 stops19h 39m

$400

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Wed 4/15

7:00 am-3:45 pm

1 stop29h 45m

Toronto Pearson Intl

Tue 4/21

4:55 pm-8:53 am

2 stops18h 58m

$413

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Fri 3/6

6:15 am-3:35 pm

1 stop30h 20m

Toronto Pearson Intl

Wed 3/11

4:45 pm-9:24 am

2 stops19h 39m

$413

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Tue 4/21

7:00 am-3:45 pm

1 stop29h 45m

Toronto Pearson Intl

Tue 4/28

4:55 pm-10:32 pm

1 stop8h 37m

$416

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Sat 4/25

2:09 pm-3:45 pm

1 stop22h 36m

Toronto Pearson Intl

Tue 5/5

4:55 pm-8:53 am

2 stops18h 58m

$416

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Tue 3/31

7:00 am-3:45 pm

1 stop29h 45m

Toronto Pearson Intl

Tue 4/7

4:55 pm-11:43 pm

1 stop9h 48m

$416

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Sat 3/14

6:15 am-3:35 pm

1 stop30h 20m

Toronto Pearson Intl

Sat 3/21

4:45 pm-11:43 pm

1 stop9h 58m

$416

OaklandMontreal

OAK - YUL

OAKYUL

Oakland

Tue 3/31

12:35 pm-11:37 am

2 stops20h 02m

Montreal Pierre Elliott Trudeau Intl

Mon 4/6

7:00 am-11:46 pm

2 stops19h 46m

$504

OaklandMontreal

OAK - YUL

OAKYUL

Oakland

Tue 3/31

12:35 pm-11:37 am

2 stops20h 02m

Montreal Pierre Elliott Trudeau Intl

Sat 4/4

7:00 am-9:43 pm

2 stops17h 43m

$574

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/11

Showing 1-10 of 52 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 $130). Flying from Oakland, California to Region of Ontario in January is currently the most expensive (average of $221). 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.

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 20h 02m. The time it takes to get you to your destination can typically vary by up to 10h 23m. The distance from Oakland, California to Region of Ontario is about 2520 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 - 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, February is the cheapest month in which you can book a flight from Oakland, California to Region of Ontario (average of $130). Flying from Oakland, California to Region of Ontario in January is currently the most expensive (average of $221). 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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