$115 Cheap Flights from San Diego (SAN) to Ontario (ONT)

View $115 flight on Mon, Feb 9, 2026Opens in a new window

Popular airlines from San Diego Intl. Airport (SAN) to Los Angeles - Ontario Intl. Airport (ONT)

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Cheap Flights from San Diego to Ontario (SAN-ONT)

Prices were available within the past 7 days and start at $115 for one-way flights and $187 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, Jan 7 - Sun, Jan 11
SAN
San Diego
ONT
Ontario
$187 Roundtrip, found 4 days ago
$187
Roundtrip
found 4 days ago
Select Delta flight, departing Wed, Jan 7 from San Diego to Ontario, returning Sun, Jan 11, priced at $187 found 4 days ago
Alaska Airlines
Thu, Jan 29 - Wed, Feb 4
SAN
San Diego
ONT
Ontario
$204 Roundtrip, found 5 days ago
$204
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Thu, Jan 29 from San Diego to Ontario, returning Wed, Feb 4, priced at $204 found 5 days ago
Hawaiian Airlines
Wed, Jan 28 - Sat, Feb 7
SAN
San Diego
ONT
Ontario
$222 Roundtrip, found 2 days ago
$222
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Wed, Jan 28 from San Diego to Ontario, returning Sat, Feb 7, priced at $222 found 2 days ago
Hawaiian Airlines
Tue, Jan 13 - Wed, Jan 21
SAN
San Diego
ONT
Ontario
$224 Roundtrip, found 2 days ago
$224
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Tue, Jan 13 from San Diego to Ontario, returning Wed, Jan 21, priced at $224 found 2 days ago
Alaska Airlines
Tue, Jan 13 - Sat, Jan 17
SAN
San Diego
ONT
Ontario
$226 Roundtrip, found 1 day ago
$226
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Tue, Jan 13 from San Diego to Ontario, returning Sat, Jan 17, priced at $226 found 1 day ago
Delta
Fri, Jan 9 - Sun, Jan 18
SAN
San Diego
ONT
Ontario
$227 Roundtrip, found 1 day ago
$227
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Jan 9 from San Diego to Ontario, returning Sun, Jan 18, priced at $227 found 1 day ago
Alaska Airlines
Wed, Jan 14 - Wed, Jan 28
SAN
San Diego
ONT
Ontario
$234 Roundtrip, found 5 days ago
$234
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Wed, Jan 14 from San Diego to Ontario, returning Wed, Jan 28, priced at $234 found 5 days ago
Alaska Airlines
Thu, Jan 22 - Sun, Jan 25
SAN
San Diego
ONT
Ontario
$235 Roundtrip, found 4 days ago
$235
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Thu, Jan 22 from San Diego to Ontario, returning Sun, Jan 25, priced at $235 found 4 days ago
Southwest Airlines
Wed, Jan 7 - Sun, Jan 11
SAN
San Diego
ONT
Ontario
$256 Roundtrip, found 4 days ago
$256
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Wed, Jan 7 from San Diego to Ontario, returning Sun, Jan 11, priced at $256 found 4 days ago
American Airlines
Thu, Jan 8 - Sat, Jan 10
SAN
San Diego
ONT
Ontario
$270 Roundtrip, found 5 days ago
$270
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Jan 8 from San Diego to Ontario, returning Sat, Jan 10, priced at $270 found 5 days ago

Find the cheapest month to fly from San Diego (SAN) to Ontario (ONT)

August is typically the cheapest month to fly

From $162 - $696 per traveler.

Alternative airports near Ontario

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to John Wayne SNA. Average driving time to city center is 42 minutes. Flights from $604
SNA
John Wayne
Average driving time to city center42 min
Flights from $604
Flights from San Diego (SAN) to Ontario (ONT)
Origin airport
San Diego Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, Southwest Airlines, United
Roundtrip price
$187
Distance
94 mi

San Diego to Ontario Flights

The cheapest times to fly from San Diego to Ontario

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from San Diego to Ontario are during the month of January. You can find some of the cheapest flights from San Diego to Ontario with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from San Diego to Ontario

Sunday is one of the best days to book for cheap flights from San Diego to Ontario: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from San Diego to Ontario

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from San Diego to Ontario in 2026. You can also book with separate airlines for your outbound and return journeys, from $115 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap San Diego to Ontario flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your San Diego to Ontario airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from San Diego Intl. Airport (SAN) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Snag a cheap one-way flight from $115 or cheap return flight from $187 from San Diego Intl. Airport (SAN) to Los Angeles - Ontario Intl. Airport (ONT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from San Diego Intl. Airport (SAN) to Los Angeles - Ontario Intl. Airport (ONT)?
The cheapest month to fly from SAN to ONT is January, when there's less demand. Off-peak months are typically when you'll find lower airfares between these airports.
What is the cheapest airline that flies from San Diego Intl. Airport (SAN) to Los Angeles - Ontario Intl. Airport (ONT)?
Expedia's filter tool lets you easily compare airlines, flight times and fares all in one place. Select your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest SAN to ONT flight.
How many flights per day from San Diego Intl. Airport (SAN) to Los Angeles - Ontario Intl. Airport (ONT)?
Direct flights from San Diego Intl. Airport (SAN) to Los Angeles - Ontario Intl. Airport (ONT) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SAN to ONT?
Friday is typically the busiest day for flights, while Tuesday tends to be the quietest.* Remember that flight schedules can vary depending on a number of factors, such as the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What airline has the least delays from SAN to ONT?
Sun Country Airlines has the strongest track record for on-time direct flights from San Diego Intl. Airport (SAN) to Los Angeles - Ontario Intl. Airport (ONT), with an on-time score of 100%. Use the Expedia App to look up your flight status before you jet off and get real-time updates about any trip changes.
What is the best time to fly from San Diego Intl. Airport (SAN) to Los Angeles - Ontario Intl. Airport (ONT)?
To touch down at Los Angeles - Ontario Intl. Airport (ONT) on schedule, choose a flight that leaves San Diego Intl. Airport (SAN) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Ontario from San Diego Intl. Airport (SAN)?
Check out your flight options from San Diego Intl. Airport (SAN) to Los Angeles Intl. Airport (LAX). This is the only Ontario airport you can touch down at if you're taking a direct flight.
Is it cheaper to buy a plane ticket from San Diego Intl. Airport (SAN) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Booking your flight from SAN to ONT just before your journey is generally more expensive. But if you're flexible with your travel times and dates, you could bag a cheap last-minute fare.
Is it cheaper to book a SAN to ONT flight and hotel package?
You'll typically save money by booking a SAN to ONT flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one convenient place. After choosing your ideal accommodations and flights, consider adding extras such as activities, tours and car rentals.
Can I cancel or change the date of my flight from San Diego Intl. Airport (SAN) to Los Angeles - Ontario Intl. Airport (ONT)?
Usually, it's possible to reschedule or cancel your SAN to ONT flight. However, if the booking was made more than 24 hours ago, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find more information on our Customer Service portal.

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*Available to One Key members.