Find flights
When to book
FAQs

Cheap flights from Oakland, CA to Ontario from C$ 188

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 25/9. Fares are subject to change and may not be available on all flights or dates of travel.
OAK — YYZ
15 Oct — 22 Oct1
1 adult
1 adult, Economy

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 15 September 2025.

Round-trip from

C$ 477

One-way from

C$ 188

Popular in

December

Cheapest in

April

Average price

C$ 622
Alaska Airlines
  • Alaska Airlines
  • 8/11-12/11
  • 2 total stops
  • 26h 46m total
  • Oakland to Ontario
Search Deals
25/9
  • 25/9
  • 1 total stop
  • 10h 28m total
  • Oakland to Ontario
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (C$ 111 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 34 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

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 15 September 2025.

Sat 25/106:40 a.m.OAK - YYZ
2 stops14h 42mMultiple Airlines
Wed 29/104:45 p.m.YYZ - OAK
1 stop10h 14mMultiple Airlines
Deal found 15/9C$ 539
Wed 29/106:30 a.m.OAK - YYZ
1 stop30h 05mAlaska Airlines
Wed 5/114:45 p.m.YYZ - OAK
1 stop10h 14mAlaska Airlines
Deal found 14/9C$ 543
Fri 17/106:40 a.m.OAK - YYZ
1 stop29h 20mMultiple Airlines
Tue 21/101:30 p.m.YYZ - OAK
2 stops13h 33mMultiple Airlines
Deal found 15/9C$ 554
Tue 11/116:30 a.m.OAK - YYZ
1 stop30h 05mAlaska Airlines
Thu 13/114:45 p.m.YYZ - OAK
1 stop10h 14mAlaska Airlines
Deal found 15/9C$ 557
Mon 22/910:56 a.m.OAK - YYZ
3 stops32h 57mMultiple Airlines
Mon 29/99:00 a.m.YYZ - OAK
3 stops17h 32mMultiple Airlines
Deal found 15/9C$ 559
Sat 4/106:30 a.m.OAK - YYZ
1 stop10h 15mMultiple Airlines
Tue 7/109:10 a.m.YYZ - OAK
2 stops17h 53mMultiple Airlines
Deal found 14/9C$ 566
Thu 13/112:49 p.m.OAK - YYZ
1 stop21h 46mAlaska Airlines
Mon 17/114:45 p.m.YYZ - OAK
1 stop20h 40mAlaska Airlines
Deal found 14/9C$ 572
Thu 30/108:03 p.m.OAK - YYZ
2 stops20h 57mMultiple Airlines
Thu 6/114:45 p.m.YYZ - OAK
1 stop10h 14mMultiple Airlines
Deal found 15/9C$ 579
Sat 25/106:40 a.m.OAK - YHM
2 stops14h 19mMultiple Airlines
Wed 29/108:15 a.m.YHM - OAK
2 stops18h 44mMultiple Airlines
Deal found 15/9C$ 960
Mon 13/106:40 a.m.OAK - YHM
2 stops14h 19mMultiple Airlines
Mon 20/107:05 a.m.YHM - OAK
2 stops19h 58mMultiple Airlines
Deal found 15/9C$ 995
Thu 20/1112:28 p.m.OAK - YUL
2 stops32h 14mDelta
Tue 2/127:10 a.m.YUL - OAK
2 stops36h 04mDelta
Deal found 13/9C$ 1,042
Wed 29/105:55 a.m.OAK - YUL
2 stops14h 26mDelta
Wed 5/114:39 p.m.YUL - OAK
2 stops10h 14mDelta
Deal found 14/9C$ 1,073

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 629,999 searches. Data last updated 15 September 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 28/11

6:15 a.m.-3:35 p.m.

1 stop30h 20m

Toronto Pearson Intl

Wed 3/12

4:45 p.m.-11:59 p.m.

1 stop10h 14m

C$ 555

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Fri 17/10

6:40 a.m.-3:00 p.m.

1 stop29h 20m

Toronto Pearson Intl

Tue 21/10

1:30 p.m.-12:03 a.m.

2 stops13h 33m

C$ 555

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Tue 11/11

9:48 a.m.-3:35 p.m.

2 stops26h 47m

Toronto Pearson Intl

Thu 13/11

4:45 p.m.-11:59 p.m.

1 stop10h 14m

C$ 571

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Thu 13/11

2:49 p.m.-3:35 p.m.

1 stop21h 46m

Toronto Pearson Intl

Mon 17/11

4:45 p.m.-10:25 a.m.

1 stop20h 40m

C$ 572

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Fri 14/11

6:30 a.m.-3:35 p.m.

1 stop30h 05m

Toronto Pearson Intl

Thu 20/11

4:45 p.m.-11:59 p.m.

1 stop10h 14m

C$ 584

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Mon 27/10

6:30 a.m.-3:35 p.m.

1 stop30h 05m

Toronto Pearson Intl

Thu 30/10

4:45 p.m.-11:59 p.m.

1 stop10h 14m

C$ 587

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Sat 8/11

2:49 p.m.-3:35 p.m.

1 stop21h 46m

Toronto Pearson Intl

Sun 16/11

4:45 p.m.-1:55 p.m.

1 stop24h 10m

C$ 601

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Fri 7/11

6:30 a.m.-3:35 p.m.

1 stop30h 05m

Toronto Pearson Intl

Mon 10/11

4:45 p.m.-1:55 p.m.

1 stop24h 10m

C$ 613

OaklandToronto

OAK - YYZ

OAKYYZ

Oakland

Thu 16/10

2:33 p.m.-3:00 p.m.

1 stop21h 27m

Toronto Pearson Intl

Tue 21/10

4:45 p.m.-10:23 a.m.

1 stop20h 38m

C$ 616

OaklandMontreal

OAK - YUL

OAKYUL

Oakland

Tue 28/10

10:17 p.m.-8:25 a.m.

1 stop31h 08m

Montreal Pierre Elliott Trudeau Intl

Tue 4/11

4:15 p.m.-11:59 p.m.

2 stops34h 44m

C$ 899

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/9

Showing 1-10 of 52 results
1
2
3
...
6

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 C$ 169). Flying from Oakland, California to Region of Ontario in July is currently the most expensive (average of C$ 258). 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 11.3 km from the centre of the city.

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

    A quick flight from Oakland, California to Region of Ontario can take about 30h 20m. Alaska Airlines provides one of the quickest options available for as low as C$ 555. The distance between Oakland, California and Region of Ontario is about 3610 km. This flight may include one or multiple stops.

  • What are the most popular routes from Oakland, California to Region of Ontario?

    While some choose either Oakland - Montreal Pierre Elliott Trudeau Intl or Oakland - Toronto Island, Oakland - Toronto Pearson Intl is the most popular route from Oakland, California to Region of Ontario.

  • 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 C$ 169). Flying from Oakland, California to Region of Ontario in July is currently the most expensive (average of C$ 258). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Oakland to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Pearson Intl flights
Los Angeles to Vancouver Intl flights
San Francisco to Vancouver Intl flights
San Francisco to Pearson Intl flights
Los Angeles to Calgary flights
Los Angeles to Pierre Elliott Trudeau Intl flights
San Diego to Vancouver Intl flights
Santa Ana to Vancouver Intl flights
San Francisco to Pierre Elliott Trudeau Intl flights
Ontario to Vancouver Intl flights
San Francisco to Abbotsford flights
San Francisco to Calgary flights
San Jose to Vancouver Intl flights
Los Angeles to Abbotsford flights
Sacramento to Vancouver Intl flights
Santa Ana to Pearson Intl flights
San Diego to Pearson Intl flights
Los Angeles to Toronto Island flights
Las Vegas to Vancouver Intl flights
San Francisco to Toronto Island flights
Sacramento to Pearson Intl flights
Ontario to Calgary flights
Palm Springs to Vancouver Intl flights
San Jose to Pearson Intl flights
San Diego to Calgary flights
Ontario to Pearson Intl flights
Las Vegas to Pearson Intl flights
San Diego to Pierre Elliott Trudeau Intl flights
San Francisco to Hamilton flights
Los Angeles to Edmonton flights
Los Angeles to Hamilton flights
Oakland to Vancouver Intl flights
Palm Springs to Calgary flights
San Diego to Abbotsford flights
Fresno to Pearson Intl flights
Ontario to Pierre Elliott Trudeau Intl flights
Santa Ana to Calgary flights
Burbank to Vancouver Intl flights
Fresno to Vancouver Intl flights
Los Angeles to Québec City flights
Reno to Vancouver Intl flights
Las Vegas to Calgary flights
Santa Rosa to Halifax flights
Oakland to Pearson Intl flights
San Francisco to Victoria flights
San Jose to Calgary flights
Los Angeles to Region of Waterloo Intl flights
San Francisco to Edmonton flights
San Francisco to Québec City flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Oakland to Ontario?

Cheapflights makes it easy to find Oakland to Ontario flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Oakland to Ontario?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Oakland to Ontario for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Oakland to Ontario with no change fees?

Yes! Cheapflights helps users easily find flights from Oakland to Ontario with no change fees.

Can Cheapflights notify me if prices for flights from Oakland to Ontario become cheaper?

Yes! Start tracking prices for Oakland to Ontario flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.