How popular is this Oakland, California to Ontario flight route?

Within the past month, 16 users have taken a look at flights from Oakland to Ontario.

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

There are many flights that can get you from Oakland, California to Ontario in 1h 20m. Fly via Southwest to get the fastest option. There are 361 mi between Oakland, California and Ontario. All flights are typically nonstop.

What are the cheapest airlines flying from Oakland, California to Ontario round-trip?

Our cheapest airline available from Oakland, California to Ontario is Spirit Airlines. Our recent data shows that you can find tickets from as low as $22 on this airline. Additional options worth looking into are Frontier and United Airlines, starting at $24 and $58 round-trip. Users have found that Spirit Airlines is 91% cheaper than the other options available to this destination.

What are the cheapest airlines to fly from Oakland, California to Ontario one-way?

The cheapest airlines for a one-way flight from Oakland, California to Ontario are Frontier ($33), Southwest ($48), and United Airlines ($58).

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

What are the cheapest flights from Oakland, California to Ontario?

Looking for the cheapest flight from Oakland, California to Ontario? While on average our users pay $304, our data indicates the cheapest price to be $129. The most popular route (Oakland - Ontario), is priced around $213.

What are the most popular airlines that fly from Oakland, California to Ontario?

Before booking your flight from Oakland, California to Ontario check out the most popular airlines for this route: Southwest, Frontier or United Airlines.

Most accurate provider : When it comes to deals on Oakland, California-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Oakland, California-Ontario flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Oakland, California-Ontario flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Oakland, California-Ontario flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Oakland, California-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airports do I use to fly from Oakland to Ontario?

If you book a flight from Oakland to Ontario, you will be flying from Oakland to Ontario. Flights to Ontario (ONT) from Oakland (OAK) take 1h 20m for a nonstop flight. There is 1 flight from Oakland to Ontario per day from 5 airlines.

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.

$86+ Flights from Oakland, CA to Ontario

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Find cheap flights from Oakland to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Oakland to Ontario are usually found in August or May, booked 62 days in advance, depart on a Tuesday or Sunday and return on a Saturday

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 December 18, 2025.

Tue 12/303:25 pmOAK - ONT

Nonstop1h 20mSouthwest

Mon 1/57:55 pmONT - OAK

Nonstop1h 25mSouthwest

Deal found 12/16

$359

Mon 12/226:10 amOAK - ONT

Nonstop1h 20mSouthwest

Sun 1/46:20 amONT - OAK

Nonstop1h 25mSouthwest

Deal found 12/15

$411

Tue 12/236:10 amOAK - ONT

Nonstop1h 20mSouthwest

Thu 1/16:15 pmONT - OAK

Nonstop1h 25mSouthwest

Deal found 12/16

$418

Tue 12/2311:15 amOAK - ONT

1 stop4h 15mSouthwest

Tue 12/306:20 amONT - OAK

Nonstop1h 25mSouthwest

Deal found 12/16

$421

Sun 12/286:10 pmOAK - ONT

2 stops5h 45mSouthwest

Fri 1/29:10 pmONT - OAK

1 stop11h 00mSouthwest

Deal found 12/16

$442

Mon 12/296:10 pmOAK - ONT

2 stops5h 45mSouthwest

Thu 1/18:40 amONT - OAK

2 stops9h 30mSouthwest

Deal found 12/17

$447

Best flights from Oakland to Ontario
Discover carefully curated flight deals from Oakland to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 18, 2025.

Thu 1/296:10 pmOAK - ONT

Nonstop1h 20mSouthwest

Mon 2/27:20 amONT - OAK

Nonstop1h 25mSouthwest

Deal found 12/17

$213

Thu 1/156:35 amOAK - ONT

Nonstop1h 20mSouthwest

Tue 1/207:20 amONT - OAK

Nonstop1h 25mSouthwest

Deal found 12/17

$226

Tue 1/202:45 pmOAK - ONT

Nonstop1h 20mSouthwest

Fri 3/274:00 pmONT - OAK

Nonstop1h 40mSouthwest

Deal found 12/17

$235

Thu 1/156:35 amOAK - ONT

Nonstop1h 20mSouthwest

Sun 1/187:20 amONT - OAK

Nonstop1h 25mSouthwest

Deal found 12/17

$236

Fri 1/231:00 pmOAK - ONT

Nonstop1h 20mSouthwest

Mon 1/263:20 pmONT - OAK

Nonstop1h 25mSouthwest

Deal found 12/16

$236

Thu 1/89:30 amOAK - ONT

2 stops7h 40mSouthwest

Mon 1/128:30 amONT - OAK

2 stops6h 20mSouthwest

Deal found 12/16

$243

Thu 2/264:15 pmOAK - ONT

2 stops5h 10mSouthwest

Mon 3/29:45 amONT - OAK

2 stops8h 45mSouthwest

Deal found 12/15

$243

Thu 1/1512:25 pmOAK - ONT

Nonstop1h 20mSouthwest

Sun 1/252:30 pmONT - OAK

1 stop8h 00mSouthwest

Deal found 12/18

$246

Sat 2/146:55 pmOAK - ONT

Nonstop1h 25mSouthwest

Mon 2/167:15 pmONT - OAK

1 stop4h 55mSouthwest

Deal found 12/17

$246

Last-minute flights from Oakland to Ontario
Discover last-minute flight deals from Oakland to Ontario. Data last updated December 18, 2025 and is based on user searches.

Thu 1/1512:25 pmOAK - ONT

Nonstop1h 20mSouthwest

Tue 1/205:55 amONT - OAK

2 stops6h 20mSouthwest

Deal found 12/17

$207

Thu 1/156:35 amOAK - ONT

Nonstop1h 20mSouthwest

Sun 1/187:20 amONT - OAK

Nonstop1h 25mSouthwest

Deal found 12/17

$236

Tue 1/202:45 pmOAK - ONT

Nonstop1h 20mSouthwest

Fri 3/274:00 pmONT - OAK

Nonstop1h 40mSouthwest

Deal found 12/17

$235

Tue 1/271:00 pmOAK - ONT

Nonstop1h 20mSouthwest

Fri 1/3010:00 amONT - OAK

Nonstop1h 30mSouthwest

Deal found 12/16

$215

Thu 1/296:10 pmOAK - ONT

Nonstop1h 20mSouthwest

Mon 2/27:20 amONT - OAK

Nonstop1h 25mSouthwest

Deal found 12/17

$213

One-way flights from Oakland to Ontario
Search for one-way flight options from Oakland to Ontario. Find affordable one-way fares based on user searches. Data last updated December 18, 2025.

Wed 1/142:45 pmOAK - ONT

Nonstop1h 20mSouthwest

Deal found 12/17

$86

Thu 1/1512:25 pmOAK - ONT

Nonstop1h 20mSouthwest

Deal found 12/16

$107

Tue 4/73:45 pmOAK - ONT

Nonstop1h 20mSouthwest

Deal found 12/17

$110

Thu 1/2212:10 pmOAK - ONT

1 stop4h 45mSouthwest

Deal found 12/15

$117

Fri 3/135:00 pmOAK - ONT

2 stops24h 12mDelta

Deal found 12/16

$124

Sat 1/318:10 amOAK - ONT

2 stops12h 00mAlaska Airlines

Deal found 12/15

$127

Sun 2/156:35 amOAK - ONT

Nonstop1h 20mSouthwest

Deal found 12/16

$130

Find flight deals from Oakland to Ontario

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$207 (Southwest)
One-way from	$86 (Southwest)
Popular in	December
Cheapest in	August
Average price	$299
Good round-trip deal	$299 or less
Good one-way deal	$154 or less

Provider with most accurate pricing for Oakland-Ontario flight deals.

Search Deals

Provider most trusted by Cheapflights users for Oakland-Ontario 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. 3% potential increase in price ($9 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Price to beat on a round-trip flight from Oakland to Ontario.

Search Deals

Price to beat on a one-way flight from Oakland to Ontario.

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

OaklandOntario

OAK - ONT

OAKONT

Oakland

Thu 1/29

6:10 pm-7:30 pm

Nonstop1h 20m

Ontario

Mon 2/2

7:20 am-8:45 am

Nonstop1h 25m

$213

OaklandOntario

OAK - ONT

OAKONT

Oakland

Thu 1/15

6:35 am-7:55 am

Nonstop1h 20m

Ontario

Tue 1/20

7:20 am-8:45 am

Nonstop1h 25m

$226

OaklandOntario

OAK - ONT

OAKONT

Oakland

Tue 1/20

2:45 pm-4:05 pm

Nonstop1h 20m

Ontario

Fri 3/27

4:00 pm-5:40 pm

Nonstop1h 40m

$235

OaklandOntario

OAK - ONT

OAKONT

Oakland

Thu 1/15

6:35 am-7:55 am

Nonstop1h 20m

Ontario

Sun 1/18

7:20 am-8:45 am

Nonstop1h 25m

$236

OaklandOntario

OAK - ONT

OAKONT

Oakland

Fri 1/23

1:00 pm-2:20 pm

Nonstop1h 20m

Ontario

Mon 1/26

3:20 pm-4:45 pm

Nonstop1h 25m

$236

OaklandOntario

OAK - ONT

OAKONT

Oakland

Thu 1/8

9:30 am-5:10 pm

2 stops7h 40m

Ontario

Mon 1/12

8:30 am-2:50 pm

2 stops6h 20m

$243

OaklandOntario

OAK - ONT

OAKONT

Oakland

Thu 2/26

4:15 pm-9:25 pm

2 stops5h 10m

Ontario

Mon 3/2

9:45 am-6:30 pm

2 stops8h 45m

$243

OaklandOntario

OAK - ONT

OAKONT

Oakland

Thu 1/15

12:25 pm-1:45 pm

Nonstop1h 20m

Ontario

Sun 1/25

2:30 pm-10:30 pm

1 stop8h 00m

$246

OaklandOntario

OAK - ONT

OAKONT

Oakland

Sat 2/14

6:55 pm-8:20 pm

Nonstop1h 25m

Ontario

Mon 2/16

7:15 pm-12:10 am

1 stop4h 55m

$246

OaklandOntario

OAK - ONT

OAKONT

Oakland

Wed 1/14

1:00 pm-2:20 pm

Nonstop1h 20m

$86

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 17 results

Compare providers for flights from Oakland to Ontario

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Oakland to Ontario in December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Priceline	Price Accuracy1 star	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Oakland, California-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Oakland, California-Ontario flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Oakland, California-Ontario flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Oakland, California-Ontario flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Oakland, California-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

How far ahead should I book a flight from Oakland, California to Ontario?

To ensure you get the cheapest price possible for a flight from Oakland, California to Ontario, you should look to book at least 62 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Oakland, California to Ontario?

Currently, February is the cheapest month in which you can book a flight from Oakland, California to Ontario (average of $19). Flying from Oakland, California to Ontario in July is currently the most expensive (average of $57). 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 ONT?

A simple way to save on the total cost of your ticket is to fly from Oakland, California to Ontario in the evening. If you’re flexible enough to do this you can expect to save up to 9% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from Oakland, California to Ontario?

Travelers seeking maximum savings on their Oakland, California to Ontario flight should consider departing on Sunday at noon when fares are most often at their lowest. Tuesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Oakland to Ontario flights

Cheapflights partnered with top experts to bring you the best recommendations for your Oakland to Ontario trip

Airports

OAK

For quick access to your gate, OAK's smaller size makes navigation easy, especially compared to SFO.

ONT

Consider renting a car at ONT for easy access to Southern California destinations like Palm Springs and Big Bear.

Our travel experts

Bill Fink

Expert on ONT and OAK

Reviews of airlines servicing Ontario

Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from Oakland to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Southwest

7.9

Good

4,250 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Delta

7.9

Good

8,009 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

United Airlines

7.4

Good

9,093 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Spirit Airlines

6.3

Okay

8,190 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Frontier

5.8

Fair

3,080 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Related info for your journey

What airports do I use to fly from Oakland to Ontario?
If you book a flight from Oakland to Ontario, you will be flying from Oakland to Ontario. Flights to Ontario (ONT) from Oakland (OAK) take 1h 20m for a nonstop flight. There is 1 flight from Oakland to Ontario per day from 5 airlines.
How popular is this Oakland, California to Ontario flight route?
Within the past month, 16 users have taken a look at flights from Oakland to Ontario.
How long is the flight from Oakland, California to Ontario?
There are many flights that can get you from Oakland, California to Ontario in 1h 20m. Fly via Southwest to get the fastest option. There are 361 mi between Oakland, California and Ontario. All flights are typically nonstop.
What are the cheapest airlines flying from Oakland, California to Ontario round-trip?
Our cheapest airline available from Oakland, California to Ontario is Spirit Airlines. Our recent data shows that you can find tickets from as low as $22 on this airline. Additional options worth looking into are Frontier and United Airlines, starting at $24 and $58 round-trip. Users have found that Spirit Airlines is 91% cheaper than the other options available to this destination.
What are the cheapest airlines to fly from Oakland, California to Ontario one-way?
The cheapest airlines for a one-way flight from Oakland, California to Ontario are Frontier ($33), Southwest ($48), and United Airlines ($58).
What are the cheapest flights from Oakland, California to Ontario?
Looking for the cheapest flight from Oakland, California to Ontario? While on average our users pay $304, our data indicates the cheapest price to be $129. The most popular route (Oakland - Ontario), is priced around $213.
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 Ontario?
Currently, February is the cheapest month in which you can book a flight from Oakland, California to Ontario (average of $19). Flying from Oakland, California to Ontario in July is currently the most expensive (average of $57). 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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Other flights to Ontario

Top 5 airlines flying from Oakland to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$27	Average$88	FlexibilityNo cancel fee	On-time62%
Spirit Airlines	Cheapest$46	Average$88	FlexibilityNo cancel fee	On-time65%
United Airlines	Cheapest$68	Average$148	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$98	Average$198	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$119	Average$269	FlexibilityNo cancel fee	On-time63%

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$86+ Cheap flights from Oakland, CA to Ontario (OAK - ONT)

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 1/14. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Oakland to Ontario with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Oakland to Ontario are usually found in August or May, booked 62 days in advance, depart on a Tuesday or Sunday and return on a Saturday

Cheap flight deals from Oakland to Ontario

Cheapest flights from Oakland to OntarioExplore 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 December 18, 2025.

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 December 18, 2025.

Find flight deals from Oakland to Ontario

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Cheapflights Fare Finder

Use the filters below to find and compare flights from Oakland to Ontario that are best for you.

Compare providers for flights from Oakland to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Oakland to Ontario in December.

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.

Cheapflights Insights

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

How far ahead should I book a flight from Oakland, California to Ontario?

What is the cheapest month to book a flight from Oakland, California to Ontario?

What is the cheapest time of day to fly from OAK to ONT?

What is the cheapest day to fly from Oakland, California to Ontario?

The best insider tips for Oakland to Ontario flights

AI-powered summary based on content written by travel experts. AI can make mistakes.

Cheapflights partnered with top experts to bring you the best recommendations for your Oakland to Ontario trip

Airports

OAK

ONT

Our travel experts

Reviews of airlines servicing Ontario

Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from Oakland to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

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 airports do I use to fly from Oakland to Ontario?

How popular is this Oakland, California to Ontario flight route?

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

What are the cheapest airlines flying from Oakland, California to Ontario round-trip?

What are the cheapest airlines to fly from Oakland, California to Ontario one-way?

What are the cheapest flights from Oakland, California to Ontario?

Can I find deals for flights from Oakland to Ontario that include hotel bookings?

How can I find direct flights from Oakland to Ontario?

Can I find deals for business class flights from Oakland to Ontario?

What is the cheapest month to book a flight from Oakland, California to Ontario?

Browse thousands of different options on Cheapflights for your next trip

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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.

Top 5 airlines flying from Oakland to Ontario

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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 December 18, 2025.