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$130+ 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 9/20. Fares are subject to change and may not be available on all flights or dates of travel.
OAK — YYZ
May 20 — May 271
Tue 5/20
Tue 5/27
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 May 15, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$228
(Kiwi.com)

One-way from

$130
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$478
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. 10% potential increase in price ($50 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).
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Average for round-trip flights in May 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 May 15, 2025.

This Kiwi.com deal was found by Cheapflights users on 5/14. 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.
Thu 6/55:45 amOAK - YYZ
1 stop11h 14mMultiple Airlines
Wed 6/112:00 pmYYZ - OAK
2 stops29h 15mMultiple Airlines
Deal found 5/14$228
This Cheapflightsfares deal was found by Cheapflights users on 5/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/75:50 pmOAK - YYZ
1 stop15h 00mSun Country Air
Sun 8/107:45 amYYZ - OAK
1 stop11h 54mSun Country Air
Deal found 5/14$379
This Mytrip deal was found by Cheapflights users on 5/13. 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.
Wed 6/185:30 amOAK - YHM
2 stops16h 11mMultiple Airlines
Sun 6/226:00 amYHM - OAK
3 stops30h 36mMultiple Airlines
Deal found 5/13$392
This Mytrip deal was found by Cheapflights users on 5/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/309:38 pmOAK - YOW
3 stops24h 10mMultiple Airlines
Fri 7/45:45 amYOW - OAK
2 stops17h 58mMultiple Airlines
Deal found 5/15$408
This Mytrip deal was found by Cheapflights users on 5/14. 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 6/99:09 pmOAK - YTZ
3 stops16h 36mMultiple Airlines
Wed 6/117:45 amYTZ - OAK
2 stops15h 29mMultiple Airlines
Deal found 5/14$415
This Mytrip deal was found by Cheapflights users on 5/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/89:09 pmOAK - YUL
3 stops24h 28mMultiple Airlines
Wed 6/186:45 amYUL - OAK
2 stops19h 41mMultiple Airlines
Deal found 5/15$415
This Alaska Airlines deal was found by Cheapflights users on 5/14. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/47:54 pmOAK - YYZ
1 stop16h 06mAlaska Airlines
Wed 6/114:45 pmYYZ - OAK
1 stop8h 26mAlaska Airlines
Deal found 5/14$442
This Delta deal was found by Cheapflights users on 5/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/46:00 amOAK - YYZ
1 stop7h 40mDelta
Thu 6/55:50 pmYYZ - OAK
1 stop8h 59mDelta
Deal found 5/14$448
This Delta deal was found by Cheapflights users on 5/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/712:39 pmOAK - YUL
2 stops31h 34mDelta
Tue 6/176:45 pmYUL - OAK
2 stops24h 31mDelta
Deal found 5/15$709

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 May 15, 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

Thu 6/5

5:45 am-7:59 pm

1 stop11h 14m

Toronto Pearson Intl

Tue 6/10

2:00 pm-10:56 am

2 stops23h 56m

$228

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Thu 8/7

5:50 pm-11:50 am

1 stop15h 00m

Toronto Pearson Intl

Sun 8/10

7:45 am-4:39 pm

1 stop11h 54m

$379

OaklandHamilton

OAK - YHM

OAKYHM

Oakland

Wed 6/18

5:30 am-12:41 am

2 stops16h 11m

Hamilton

Sun 6/22

6:00 am-9:36 am

3 stops30h 36m

$392

OaklandOttawa

OAK - YOW

OAKYOW

Oakland

Mon 6/30

9:38 pm-12:48 am

3 stops24h 10m

Ottawa

Fri 7/4

5:45 am-8:43 pm

2 stops17h 58m

$408

OaklandToronto

OAK - YTZ

OAKYTZ

Oakland

Mon 6/9

9:09 pm-4:45 pm

3 stops16h 36m

Toronto Island

Wed 6/11

7:45 am-8:14 pm

2 stops15h 29m

$415

OaklandMontreal

OAK - YUL

OAKYUL

Oakland

Sun 6/8

9:09 pm-12:37 am

3 stops24h 28m

Montreal Pierre Elliott Trudeau Intl

Wed 6/18

6:45 am-11:26 pm

2 stops19h 41m

$415

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Wed 6/4

7:54 pm-3:00 pm

1 stop16h 06m

Toronto Pearson Intl

Wed 6/11

4:45 pm-10:11 pm

1 stop8h 26m

$442

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Wed 6/4

6:00 am-4:40 pm

1 stop7h 40m

Toronto Pearson Intl

Thu 6/5

5:50 pm-11:49 pm

1 stop8h 59m

$448

OaklandMontreal

OAK - YUL

OAKYUL

Oakland

Sat 6/7

12:39 pm-11:13 pm

2 stops31h 34m

Montreal Pierre Elliott Trudeau Intl

Tue 6/17

6:45 pm-4:16 pm

2 stops24h 31m

$709

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Sat 9/20

7:30 am-5:51 am

3 stops19h 21m

$130

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/15

Showing 1-10 of 15 results
1
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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, 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 May 15, 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 May 15, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Delta and Sun Country Air 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
10,000 reviews

Crew

8.5

Comfort

7.9

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Comfort

7.9

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Comfort

7.9

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Sun Country Air
6.9
Okay
346 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Comfort

7.9

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 cheapest airlines to fly from Oakland, California to Region of Ontario one-way?

    The cheapest airlines for a one-way flight from Oakland, California to Region of Ontario are Sun Country Air ($181), Alaska Airlines ($194), and Delta ($196).

  • 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, 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

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Alternative routes for Oakland to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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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 May 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$456Average$659FlexibilityNo cancel feeOn-timeN/A

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