$187 Cheap Delta flights Ontario (ONT) to San Diego (SAN)

View $187 flight on Fri, Nov 7, 2025Opens in a new window

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$187 Cheap Delta flights Ontario (ONT) to San Diego (SAN)

Prices were available within the past 7 days and start at $187 for one-way flights and $343 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, Oct 25 - Tue, Nov 11
ONT
Ontario
SAN
San Diego
$343 Roundtrip, found 4 days ago
$343
Roundtrip
found 4 days ago
Select Delta flight, departing Sat, Oct 25 from Ontario to San Diego, returning Tue, Nov 11, priced at $343 found 4 days ago
Delta
Fri, Oct 24 - Tue, Nov 11
ONT
Ontario
SAN
San Diego
$363 Roundtrip, found 4 days ago
$363
Roundtrip
found 4 days ago
Select Delta flight, departing Fri, Oct 24 from Ontario to San Diego, returning Tue, Nov 11, priced at $363 found 4 days ago
Flights from Ontario (ONT) to San Diego (SAN)
Origin airport
Los Angeles - Ontario Intl.
Destination airport
San Diego Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, Southwest Airlines, United
Popular airline
Alaska Airlines
Distance
94 mi

Frequently asked questions

How much is a Delta Air Lines flight from Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN)?
You'll discover affordable return Delta Air Lines flights from $343 from ONT to SAN by organizing your results from "Price (lowest to highest)" on Expedia. Or search for deals from $187 for a one-way journey.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from ONT to SAN with Delta Air Lines?
Search for round-trip or one-way flights to San Diego in January or November. You could find cheaper fares with Delta Air Lines during these off-peak travel months.
What is the cheapest time to book flights from Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN) with Delta Air Lines?
For cheap Delta Air Lines fares from Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN), start searching one to three months before your intended departure. Reserving domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also affect the overall price. Sunday tends to be the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your trip on a Sunday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does Delta Air Lines fly nonstop from Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN)?
Simply enter your dates, hit search and check "Nonstop" on Expedia to find any direct flights from ONT to SAN with Delta Air Lines or other carriers.
What is the earliest Delta Air Lines flight from ONT to SAN?
Find Delta Air Lines's earliest flights from ONT to SAN by checking the "Morning" and "Early Morning" filters. Not only will you arrive at your destination sooner, early departures also experience 20% fewer cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does Delta Air Lines fly into in San Diego?
Delta Air Lines flights from Los Angeles - Ontario Intl. Airport (ONT) to San Diego arrive at San Diego Intl. Airport (SAN). This is the main gateway here.
Why fly with Delta Air Lines from ONT to SAN?
Taking off from ONT to SAN with Delta Air Lines comes with a host of perks, such as an excellent in-flight experience and a rewarding loyalty program. Plus, when you book through Expedia, One Key™ members can earn OneKeyCash™* to use on select future travel purchases. That's in addition to the Delta SkyMiles points you can earn with Delta Air Lines.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my Delta Air Lines flight from Los Angeles - Ontario Intl. Airport (ONT) to San Diego Intl. Airport (SAN)?
In most cases, you can cancel or change your flight, although there may be additional charges if you booked more than 24 hours ago. Prefer to keep your options open? Use Expedia's "Changes included" or "No cancel fee" filter to find flights that won't penalize you if you have to alter your plans. To update your itinerary, visit "Trips," select your flight and click on "Manage Booking" for more details.

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*Available to One Key members.