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$131+ 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 9/24. Fares are subject to change and may not be available on all flights or dates of travel.
OAK — YYZ
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
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 September 17, 2025.

Round-trip from

$390
(Kiwi.com)

One-way from

$131
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$450
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 ($58 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($18 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 17, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/256:40 amOAK - YYZ
2 stops14h 42mMultiple Airlines
Wed 10/294:45 pmYYZ - OAK
1 stop10h 14mMultiple Airlines
Deal found 9/15$390
This Kiwi.com deal was found by Cheapflights users on 9/17. 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.
Tue 12/92:31 pmOAK - YYZ
1 stop22h 04mMultiple Airlines
Wed 12/177:45 amYYZ - OAK
2 stops19h 14mMultiple Airlines
Deal found 9/17$391
This Alaska Airlines deal was found by Cheapflights users on 9/17. 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.
Sat 11/18:03 pmOAK - YYZ
1 stop17h 32mAlaska Airlines
Sat 11/84:45 pmYYZ - OAK
1 stop10h 14mAlaska Airlines
Deal found 9/17$393
This KAYAK deal was found by Cheapflights users on 9/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/288:03 pmOAK - YYZ
1 stop16h 32mAlaska Airlines
Fri 10/314:45 pmYYZ - OAK
1 stop10h 14mAlaska Airlines
Deal found 9/17$400
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/176:40 amOAK - YYZ
1 stop29h 20mMultiple Airlines
Tue 10/211:30 pmYYZ - OAK
2 stops13h 33mMultiple Airlines
Deal found 9/15$401
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/116:30 amOAK - YYZ
1 stop30h 05mAlaska Airlines
Thu 11/134:45 pmYYZ - OAK
1 stop10h 14mAlaska Airlines
Deal found 9/15$403
This Mytrip deal was found by Cheapflights users on 9/15. 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 9/2210:56 amOAK - YYZ
3 stops32h 57mMultiple Airlines
Mon 9/299:00 amYYZ - OAK
3 stops17h 32mMultiple Airlines
Deal found 9/15$405
This Alaska Airlines deal was found by Cheapflights users on 9/17. 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.
Wed 10/228:05 pmOAK - YYZ
1 stop15h 55mAlaska Airlines
Fri 10/314:45 pmYYZ - OAK
1 stop34h 14mAlaska Airlines
Deal found 9/17$414
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/308:03 pmOAK - YYZ
2 stops20h 57mMultiple Airlines
Thu 11/64:45 pmYYZ - OAK
1 stop10h 14mMultiple Airlines
Deal found 9/15$419
This Delta deal was found by Cheapflights users on 9/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/115:55 amOAK - YUL
2 stops14h 53mDelta
Tue 10/217:00 amYUL - OAK
2 stops31h 50mDelta
Deal found 9/16$521
This Delta deal was found by Cheapflights users on 9/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/115:55 amOAK - YUL
2 stops14h 53mDelta
Sat 10/256:00 amYUL - OAK
2 stops18h 32mDelta
Deal found 9/16$547
This Delta deal was found by Cheapflights users on 9/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/104:51 pmOAK - YUL
2 stops27h 57mDelta
Fri 10/247:00 amYUL - OAK
2 stops31h 50mDelta
Deal found 9/16$637

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 September 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

Fri 11/28

6:15 am-3:35 pm

1 stop30h 20m

Toronto Pearson Intl

Wed 12/3

4:45 pm-11:59 pm

1 stop10h 14m

$402

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Fri 10/17

6:40 am-3:00 pm

1 stop29h 20m

Toronto Pearson Intl

Tue 10/21

1:30 pm-12:03 am

2 stops13h 33m

$402

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Wed 10/22

8:05 pm-3:00 pm

1 stop15h 55m

Toronto Pearson Intl

Fri 10/31

4:45 pm-11:59 pm

1 stop34h 14m

$414

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Fri 11/7

6:30 am-3:35 pm

1 stop30h 05m

Toronto Pearson Intl

Mon 11/10

4:45 pm-10:25 am

1 stop20h 40m

$423

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Thu 11/13

2:49 pm-3:35 pm

1 stop21h 46m

Toronto Pearson Intl

Sun 11/16

4:45 pm-11:59 pm

1 stop34h 14m

$429

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Sat 11/8

2:49 pm-3:35 pm

1 stop21h 46m

Toronto Pearson Intl

Sun 11/16

4:45 pm-1:55 pm

1 stop24h 10m

$435

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Thu 10/16

2:33 pm-3:00 pm

1 stop21h 27m

Toronto Pearson Intl

Tue 10/21

4:45 pm-10:23 am

1 stop20h 38m

$446

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Thu 10/30

8:03 pm-3:35 pm

1 stop16h 32m

Toronto Pearson Intl

Thu 11/6

4:45 pm-11:59 pm

1 stop10h 14m

$471

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Tue 12/9

2:31 pm-3:35 pm

1 stop22h 04m

Toronto Pearson Intl

Wed 12/17

4:45 pm-11:59 pm

1 stop10h 14m

$486

OaklandMontreal

OAK - YUL

OAKYUL

Oakland

Sat 10/11

5:55 am-11:48 pm

2 stops14h 53m

Montreal Pierre Elliott Trudeau Intl

Tue 10/21

7:00 am-11:50 am

2 stops31h 50m

$521

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 55 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, 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 September 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.

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 September 17, 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
7,961 reviews

Entertainment

7.9

Comfort

7.9

Overall

8.0

Crew

8.5

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
7,961 reviews
Delta
8.0
Very good
7,961 reviews

Entertainment

7.9

Comfort

7.9

Overall

8.0

Crew

8.5

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.

  • 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 14h 53m. The time it takes to get you to your destination can typically vary by up to 15h 27m. 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, 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

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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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$456Average$568FlexibilityNo cancel feeOn-timeN/A

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