$129 Cheap Flights from Ontario (ONT) to San Diego (SAN)

View $129 flight on Fri, Jan 30, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $129 for one-way flights and $244 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Bargain Flight
Fri, Jan 9 - Sun, Jan 11
ONT
Ontario
SAN
San Diego
$244 Roundtrip, found 2 days ago
$244
Roundtrip
found 2 days ago
Select Bargain Flight flight, departing Fri, Jan 9 from Ontario to San Diego, returning Sun, Jan 11, priced at $244 found 2 days ago
Hawaiian Airlines
Wed, Dec 3 - Tue, Dec 9
ONT
Ontario
SAN
San Diego
$246 Roundtrip, found 2 days ago
$246
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Wed, Dec 3 from Ontario to San Diego, returning Tue, Dec 9, priced at $246 found 2 days ago
Delta
Sat, Nov 15 - Tue, Nov 18
ONT
Ontario
SAN
San Diego
$247 Roundtrip, found 2 days ago
$247
Roundtrip
found 2 days ago
Select Delta flight, departing Sat, Nov 15 from Ontario to San Diego, returning Tue, Nov 18, priced at $247 found 2 days ago
Delta
Mon, Dec 8 - Wed, Dec 17
ONT
Ontario
SAN
San Diego
$257 Roundtrip, found 2 days ago
$257
Roundtrip
found 2 days ago
Select Delta flight, departing Mon, Dec 8 from Ontario to San Diego, returning Wed, Dec 17, priced at $257 found 2 days ago
Alaska Airlines
Tue, Nov 4 - Thu, Nov 13
ONT
Ontario
SAN
San Diego
$266 Roundtrip, found 4 days ago
$266
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Tue, Nov 4 from Ontario to San Diego, returning Thu, Nov 13, priced at $266 found 4 days ago
Delta
Sat, Dec 13 - Wed, Dec 17
ONT
Ontario
SAN
San Diego
$267 Roundtrip, found 2 days ago
$267
Roundtrip
found 2 days ago
Select Delta flight, departing Sat, Dec 13 from Ontario to San Diego, returning Wed, Dec 17, priced at $267 found 2 days ago
Hawaiian Airlines
Sat, Jan 10 - Sat, Jan 10
ONT
Ontario
SAN
San Diego
$275 Roundtrip, found 3 days ago
$275
Roundtrip
found 3 days ago
Select Hawaiian Airlines flight, departing Sat, Jan 10 from Ontario to San Diego, returning Sat, Jan 10, priced at $275 found 3 days ago
Hawaiian Airlines
Wed, Nov 12 - Wed, Nov 19
ONT
Ontario
SAN
San Diego
$276 Roundtrip, found 2 days ago
$276
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Wed, Nov 12 from Ontario to San Diego, returning Wed, Nov 19, priced at $276 found 2 days ago
United
Wed, Nov 19 - Tue, Dec 2
ONT
Ontario
SAN
San Diego
$283 Roundtrip, found 1 day ago
$283
Roundtrip
found 1 day ago
Select United flight, departing Wed, Nov 19 from Ontario to San Diego, returning Tue, Dec 2, priced at $283 found 1 day ago
Alaska Airlines
Sat, Nov 15 - Mon, Nov 17
ONT
Ontario
SAN
San Diego
$293 Roundtrip, found 4 days ago
$293
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Sat, Nov 15 from Ontario to San Diego, returning Mon, Nov 17, priced at $293 found 4 days ago

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

September is typically the cheapest month to fly

From $162 - $607 per traveler.

Alternative airports near San Diego

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

Select flight to General Abelardo L. Rodriguez Intl. TIJ. Cheapest option available. Average driving time to city center is 26 minutes. Flights from $305
TIJ
General Abelardo L. Rodriguez Intl.
Cheapest
Average driving time to city center26 min
Flights from $305
Select flight to McClellan-Palomar CLD. Average driving time to city center is 38 minutes. Flights from $492
CLD
McClellan-Palomar
Average driving time to city center38 min
Flights from $492

Frequently asked questions

How much does a flight from Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN) cost?
Secure a cheap one-way flight from $129 or cheap return flight from $244 from Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN) 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 Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN)?
The cheapest month to fly from ONT to SAN is January, when demand is low. Off-peak season is typically when you'll find lower airfares between these airports.
Which airlines fly direct from Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN)?
You can't fly direct to San Diego Intl. Airport (SAN) from Ontario, CA (ONT-Los Angeles - Ontario Intl.). However, you can easily reach San Diego without any layovers by departing from Los Angeles Intl. Airport (LAX).
What is the cheapest airline that flies from Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN)?
To find the cheapest airline flying from ONT to SAN, use Expedia's filter tool. Customize your search based on your travel needs, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
How many flights per day from Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN)?
You'll need to take a flight with a layover if you're traveling from Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN). Direct flights don't operate daily on this route. However, simply filter your search to include one or more stops to discover an option that works for you.
What day of the week has the most flights from ONT to SAN?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can vary depending on a number of factors, such as the time of year and carrier.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What airline has the least delays from ONT to SAN?
Delta Air Lines has the best track record for on-time direct flights from Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN), with an on-time rating of 100%. Use the Expedia App to look up your journey status before you take off and get real-time alerts about any trip changes.
What is the best time to fly from Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN)?
To avoid potential delays on the Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN) route, fly before 3 PM. Departures after this hour have a 22% higher chance of cancellation.**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.
Is it cheaper to buy a plane ticket from Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN) last-minute?
Last-minute fares from ONT to SAN are usually more expensive. To lock in the best prices, start looking for flights as soon as possible. That being said, if you can play around with your travel dates, it's possible to find a cheap ticket right before you leave.
Is it cheaper to book an ONT to SAN flight and hotel package?
Opting for an ONT to SAN flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Choose from our wide range of hotels and then add activities, flights and car rentals to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN)?
If you reserved your ONT to SAN flight within the last 24 hours, you may be able to cancel or modify it without any fees. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Los Angeles - Ontario Intl.
Destination airport
San Diego Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, Southwest Airlines, United
Roundtrip price
$244
Distance
94 mi

Book with confidence

Ontario to San Diego Flights

The cheapest times to fly from Ontario to San Diego

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 Ontario to San Diego are during the month of January. You can find some of the cheapest flights from Ontario to San Diego with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Ontario to San Diego: 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 Ontario to San Diego

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 Ontario to San Diego in 2025. You can also book with separate airlines for your outbound and return journeys, from $129 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 Ontario to San Diego 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 Ontario to San Diego 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.

 

Ontario to San Diego Flights

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*Available to One Key members.