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$184+ 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 7/28. Fares are subject to change and may not be available on all flights or dates of travel.
OAK — YYZ
Jun 18 — Jun 251
Thu 6/18
Thu 6/25
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 May 19, 2026.

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.
Tue 6/306:22 am
OAK
-
YYZ
2 stops13h 23m
Multiple Airlines
Tue 7/710:05 am
YYZ
-
OAK
1 stop15h 25m
Multiple Airlines
Deal found 5/14$551
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 9/165:55 am
OAK
-
YYZ
1 stop7h 50m
Delta
Tue 9/225:50 pm
YYZ
-
OAK
1 stop8h 59m
Delta
Deal found 5/14$561
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.
Mon 8/244:57 pm
OAK
-
YYZ
2 stops16h 26m
Delta
Wed 9/25:50 pm
YYZ
-
OAK
1 stop8h 59m
Delta
Deal found 5/15$571
This Delta deal was found by Cheapflights users on 5/17. 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 6/206:00 am
OAK
-
YYZ
2 stops14h 14m
Delta
Wed 6/246:30 am
YYZ
-
OAK
2 stops12h 53m
Delta
Deal found 5/17$576
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.
Mon 8/244:57 pm
OAK
-
YYZ
2 stops16h 26m
Delta
Thu 9/37:45 am
YYZ
-
OAK
2 stops11h 46m
Delta
Deal found 5/15$577
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.
Sat 7/47:52 am
OAK
-
YYZ
2 stops14h 13m
Multiple Airlines
Tue 7/710:05 am
YYZ
-
OAK
1 stop15h 25m
Multiple Airlines
Deal found 5/14$583
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.
Wed 7/16:22 am
OAK
-
YYZ
2 stops11h 53m
Multiple Airlines
Tue 7/710:05 am
YYZ
-
OAK
1 stop15h 25m
Multiple Airlines
Deal found 5/14$588
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.
Wed 8/266:00 am
OAK
-
YYZ
1 stop7h 35m
Delta
Tue 9/15:50 pm
YYZ
-
OAK
1 stop8h 59m
Delta
Deal found 5/15$599
This Kiwi.com deal was found by Cheapflights users on 5/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/2211:15 pm
OAK
-
YYZ
1 stop18h 40m
Multiple Airlines
Mon 6/2910:25 pm
YYZ
-
OAK
2 stops18h 34m
Multiple Airlines
Deal found 5/16$607
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.
Thu 8/274:57 pm
OAK
-
YYZ
2 stops16h 26m
Delta
Fri 9/45:50 pm
YYZ
-
OAK
1 stop8h 59m
Delta
Deal found 5/15$609
This Delta deal was found by Cheapflights users on 5/19. 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 9/165:05 pm
OAK
-
YUL
2 stops27h 29m
Delta
Mon 9/2112:45 pm
YUL
-
OAK
2 stops26h 39m
Delta
Deal found 5/19$629
This Delta deal was found by Cheapflights users on 5/16. 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.
Tue 8/2512:33 pm
OAK
-
YUL
2 stops26h 09m
Delta
Wed 9/27:00 am
YUL
-
OAK
2 stops19h 49m
Delta
Deal found 5/16$642

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 May 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$551
(Kiwi.com)

One-way from

$184
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$516
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. 4% potential increase in price ($20 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 19, 2026.
Use the filters below to find and compare flights from Oakland to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Mon 7/20

5:05 pm-10:25 am

2 stops14h 20m

Toronto Pearson Intl

Mon 7/27

5:45 pm-11:50 pm

1 stop9h 05m

$609
Quickest round-trip

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Tue 6/30

6:00 am-4:35 pm

1 stop7h 35m

Toronto Pearson Intl

Sat 7/11

6:10 am-4:21 pm

2 stops13h 11m

$609

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Mon 6/15

6:00 am-11:58 pm

2 stops14h 58m

Toronto Pearson Intl

Tue 6/23

2:29 pm-11:54 pm

2 stops12h 25m

$614

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Wed 6/3

6:00 am-11:58 pm

2 stops14h 58m

Toronto Pearson Intl

Tue 6/9

4:10 pm-11:54 pm

2 stops10h 44m

$630

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Thu 8/20

4:57 pm-12:23 pm

2 stops16h 26m

Toronto Pearson Intl

Fri 8/28

5:45 pm-11:51 pm

1 stop9h 06m

$641

OaklandMontreal

OAK - YUL

OAKYUL

Oakland

Thu 9/17

1:15 pm-11:34 pm

2 stops31h 19m

Montreal Pierre Elliott Trudeau Intl

Mon 9/21

7:00 am-12:24 pm

2 stops32h 24m

$642

OaklandMontreal

OAK - YUL

OAKYUL

Oakland

Wed 9/16

5:05 pm-11:34 pm

2 stops27h 29m

Montreal Pierre Elliott Trudeau Intl

Sun 9/20

6:15 pm-4:31 pm

2 stops25h 16m

$642

OaklandMontreal

OAK - YUL

OAKYUL

Oakland

Tue 8/25

12:33 pm-5:42 pm

2 stops26h 09m

Montreal Pierre Elliott Trudeau Intl

Wed 9/2

7:00 am-11:49 pm

2 stops19h 49m

$642

OaklandMontreal

OAK - YUL

OAKYUL

Oakland

Tue 8/25

4:57 pm-11:59 pm

2 stops28h 02m

Montreal Pierre Elliott Trudeau Intl

Mon 8/31

6:15 pm-11:49 pm

2 stops32h 34m

$642

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Thu 7/9

6:00 am-10:01 pm

2 stops13h 01m

Toronto Pearson Intl

Tue 7/14

6:14 pm-11:50 pm

2 stops8h 36m

$646

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/18

Showing 1-10 of 60 resultsSorted by cheapest first
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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
No data available for this route at this time. Please check back soon.

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 Delta fly from Oakland, California to Region of Ontario in about 14h 20m. The time it takes to get you to your destination can typically vary by up to . The distance from Oakland, California to Region of Ontario is about 2243 mi.

  • 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 - Toronto Island or Oakland - Montreal Pierre Elliott Trudeau Intl.

  • 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.

See more FAQs

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