$129 Find Cheap Flights from Oakland to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Oakland to Ontario departing on 6/26. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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These are the airlines KAYAK users have selected most often from within our search results in flight searches from Oakland to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Oakland to Ontario, as well as popular online travel agencies
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Best Ontario Flight Deals from Oakland

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Ottawa
Ottawa3 stops$416
Ottawa
Ottawa3 stops$416

Cheap Flights from Oakland to Ontario (OAK-CAON)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Oakland to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Oakland to Ontario

Wed, Jun 18 - Wed, Jun 25
 Logo
5:30 am - 6:12 amOAK-YYZ
21h 42m2 stops
 Logo
7:00 am - 11:26 pmYYZ-OAK
19h 26m1 stop
Tue, Jun 17 - Tue, Jun 24
 Logo
5:30 am - 6:12 amOAK-YYZ
21h 42m2 stops
 Logo
7:00 am - 8:43 pmYYZ-OAK
16h 43m1 stop
Tue, Jun 17 - Tue, Jun 24
 Logo
5:30 am - 5:20 pmOAK-YYZ
8h 50m1 stop
 Logo
7:00 am - 8:43 pmYYZ-OAK
16h 43m1 stop
Wed, Jun 11 - Mon, Jun 16
Delta Logo
6:00 am - 4:44 pmOAK-YYZ
7h 44m1 stop
Delta Logo
5:50 pm - 11:57 pmYYZ-OAK
9h 07m1 stop
$448Delta
Find Deal
Wed, Oct 15 - Mon, Oct 20
Alaska Airlines Logo
6:40 am - 3:00 pmOAK-YYZ
29h 20m1 stop
Alaska Airlines Logo
4:45 pm - 8:45 amYYZ-OAK
19h 00m2 stops
$452Alaska Airlines
Find Deal
Wed, Jul 23 - Wed, Jul 30
Delta Logo
6:00 am - 4:40 pmOAK-YYZ
7h 40m1 stop
Delta Logo
1:04 pm - 11:55 pmYYZ-OAK
13h 51m2 stops
$458Delta
Find Deal
Sat, Oct 4 - Wed, Oct 15
Alaska Airlines Logo
7:56 pm - 3:00 pmOAK-YYZ
16h 04m1 stop
Alaska Airlines Logo
4:45 pm - 11:59 pmYYZ-OAK
10h 14m1 stop
$461Alaska Airlines
Find Deal
Wed, Jul 23 - Wed, Jul 30
Delta Logo
6:00 am - 11:59 pmOAK-YYZ
14h 59m2 stops
Delta Logo
1:04 pm - 11:55 pmYYZ-OAK
13h 51m2 stops
$463Delta
Find Deal
Wed, Oct 15 - Mon, Oct 20
Alaska Airlines Logo
6:40 am - 3:00 pmOAK-YYZ
29h 20m1 stop
Alaska Airlines Logo
4:45 pm - 11:59 pmYYZ-OAK
10h 14m1 stop
$464Alaska Airlines
Find Deal
Tue, Jun 17 - Thu, Jun 19
Delta Logo
6:00 am - 4:44 pmOAK-YYZ
7h 44m1 stop
Delta Logo
5:50 pm - 11:57 pmYYZ-OAK
9h 07m1 stop
$469Delta
Find Deal
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KAYAK's insights & trends for Oakland to Ontario flights

Get data-powered insights and trends into flights from Oakland to Ontario to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Oakland to Ontario?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Oakland to Ontario were found on Delta ($448) and Alaska Airlines ($452).


Good to know

Low seasonFebruary
High seasonNovember
Cheapest flight$129
Best time to beat the crowds with an average 75% drop in price.
Most popular time to fly and prices are also 5% lower on average.
Flight from Oakland to Toronto

FAQs - booking Ontario flights

  • How does KAYAK find such low prices on flights from Oakland to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Oakland to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Oakland to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Oakland to Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Oakland to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Oakland to Ontario with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Oakland to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Oakland to Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Ontario?

    The cheapest time of day to fly to Ontario is generally in the evening, when round-trip flights cost $340 on average. Morning departures are around 46% more expensive than evening flights, on average. The most expensive time of day to fly to Ontario is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $537.

Top airline flying from Oakland to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Oakland to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Oakland to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
DeltaOverall score based on 7952 reviews
7.9Entertainment
7.9Comfort
7.3Food
8.5Crew
8.2Boarding
Airline reviews

737-800 in first class was pretty dumpy. Seat had an uncomfortable angle, storage under the seat was blocked so even my very modest backpack didn't fit, power outlet was flaky. Weird tiny seat pockets that couldn't hold a gallon ziploc bag, emesis bag missing, etc. etc. No in-flight service due to turbulence. Crew was excellent, boarding was smooth despite a full flight.

6.0 GoodWalter, May 2025ONT - SLC
Read more Delta reviews

737-800 in first class was pretty dumpy. Seat had an uncomfortable angle, storage under the seat was blocked so even my very modest backpack didn't fit, power outlet was flaky. Weird tiny seat pockets that couldn't hold a gallon ziploc bag, emesis bag missing, etc. etc. No in-flight service due to turbulence. Crew was excellent, boarding was smooth despite a full flight.

Delta flight was on time, seats were comfortable, and crew was nice.

After a 5 hour delay waiting at the gate (3 delays adding up) with no clear reason provided, we finally boarded flew 3/4 of the way to Toronto then were turned back to New York. As we neared New York, the pilot declared that it was his fault, something to do with timing and him not being allowed into the country???? How could the airline let his happen? They had hours to prepare and make sure they had a crew available for the flight! We ended up in Toronto a day late with no sleep.

Bathrooms dirty sinks clogged. No one seemed to clean them. Plane very old

Thank you for not flipping the plane on the run way. You guys get a 5 star rating for the flight!!!

Boarding is, as it always is… horrible. Gate lice. Slow moving zones. Too many people with carry ons

Rode in a smaller plane and short trip meant no snacks, no free wifi or tv. It was only 30min flight so honestly wasn’t a big deal to lack these items.

We were forced to wait nearly 50 additional minutes before leaving the terminal.

It was terrible, if they ran flights on time it would make a big difference.

Delta seems to be improving in many areas, except they are super bad with the food available. Bring back normal food service on long flights.

Everything you need to know for your flight from Oakland to Ontario

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