$151 Cheap Flights from Wilmington (ILG) to Ontario (ONT)

View $151 flight on Sat, Jan 17, 2026Opens in a new window

Popular airlines from Wilmington, DE (ILG-New Castle) to Los Angeles - Ontario Intl. Airport (ONT)

Cheap Flights from Wilmington to Ontario (ILG-ONT)

Prices were available within the past 7 days and start at $151 for one-way flights and $334 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Sat, Jan 17 - Sat, Jan 24
ILG
Wilmington
ONT
Ontario
$334 Roundtrip, found 17 hours ago
$334
Roundtrip
found 17 hours ago
Select American Airlines flight, departing Sat, Jan 17 from Wilmington to Ontario, returning Sat, Jan 24, priced at $334 found 17 hours ago
American Airlines
Tue, Feb 3 - Thu, Feb 5
ILG
Wilmington
ONT
Ontario
$354 Roundtrip, found 2 days ago
$354
Roundtrip
found 2 days ago
Select American Airlines flight, departing Tue, Feb 3 from Wilmington to Ontario, returning Thu, Feb 5, priced at $354 found 2 days ago
American Airlines
Sat, Jan 17 - Sat, Jan 24
ILG
Wilmington
ONT
Ontario
$365 Roundtrip, found 17 hours ago
$365
Roundtrip
found 17 hours ago
Select American Airlines flight, departing Sat, Jan 17 from Wilmington to Ontario, returning Sat, Jan 24, priced at $365 found 17 hours ago
American Airlines
Thu, Feb 5 - Mon, Feb 9
ILG
Wilmington
ONT
Ontario
$371 Roundtrip, found 3 days ago
$371
Roundtrip
found 3 days ago
Select American Airlines flight, departing Thu, Feb 5 from Wilmington to Ontario, returning Mon, Feb 9, priced at $371 found 3 days ago
American Airlines
Sat, Jan 17 - Sat, Jan 24
ILG
Wilmington
ONT
Ontario
$384 Roundtrip, found 2 days ago
$384
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sat, Jan 17 from Wilmington to Ontario, returning Sat, Jan 24, priced at $384 found 2 days ago
American Airlines
Sat, Feb 14 - Wed, Feb 18
ILG
Wilmington
ONT
Ontario
$401 Roundtrip, found 3 days ago
$401
Roundtrip
found 3 days ago
Select American Airlines flight, departing Sat, Feb 14 from Wilmington to Ontario, returning Wed, Feb 18, priced at $401 found 3 days ago
American Airlines
Sat, Jan 17 - Sat, Jan 24
ILG
Wilmington
ONT
Ontario
$402 Roundtrip, found 17 hours ago
$402
Roundtrip
found 17 hours ago
Select American Airlines flight, departing Sat, Jan 17 from Wilmington to Ontario, returning Sat, Jan 24, priced at $402 found 17 hours ago
American Airlines
Wed, Jan 7 - Sat, Jan 17
ILG
Wilmington
ONT
Ontario
$418 Roundtrip, found 5 hours ago
$418
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Wed, Jan 7 from Wilmington to Ontario, returning Sat, Jan 17, priced at $418 found 5 hours ago
American Airlines
Thu, Feb 5 - Mon, Feb 9
ILG
Wilmington
ONT
Ontario
$421 Roundtrip, found 3 days ago
$421
Roundtrip
found 3 days ago
Select American Airlines flight, departing Thu, Feb 5 from Wilmington to Ontario, returning Mon, Feb 9, priced at $421 found 3 days ago
American Airlines
Thu, Jan 1 - Sat, Jan 17
ILG
Wilmington
ONT
Ontario
$432 Roundtrip, found 4 hours ago
$432
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Thu, Jan 1 from Wilmington to Ontario, returning Sat, Jan 17, priced at $432 found 4 hours ago

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. Cheapest option available. Average driving time to city center is 42 minutes. Flights from $757
SNA
John Wayne
Cheapest
Average driving time to city center42 min
Flights from $757
Flights from Wilmington (ILG) to Ontario (ONT)
Origin airport
New Castle
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
American Airlines
Roundtrip price
$333
Distance
2331 mi

Wilmington to Ontario Flights

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

 

The best time to book a flight from Wilmington to Ontario

Sunday is one of the best days to book for cheap flights from Wilmington 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 Wilmington 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 Wilmington to Ontario in 2026. You can also book with separate airlines for your outbound and return journeys, from $151 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 Wilmington 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 Wilmington 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 Wilmington, DE (ILG-New Castle) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Lock in a cheap one-way flight from $151 or cheap return flight from $334 from Wilmington, DE (ILG-New Castle) to Los Angeles - Ontario Intl. Airport (ONT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Wilmington, DE (ILG-New Castle) to Los Angeles - Ontario Intl. Airport (ONT)?
The cheapest month to fly from ILG to ONT is January, when demand is low. Off-peak season is usually when airlines offer better prices between these airports.
What is the cheapest airline that flies from Wilmington, DE (ILG-New Castle) to Los Angeles - Ontario Intl. Airport (ONT)?
Use the filter tool on Expedia to compare different airlines and find the most affordable carrier that'll take you from ILG to ONT. Then, sort your results by "Price (lowest to highest)" to snap up a good deal.
How many flights per day from Wilmington, DE (ILG-New Castle) to Los Angeles - Ontario Intl. Airport (ONT)?
There are no daily direct flights departing from Wilmington, DE (ILG-New Castle) to Los Angeles - Ontario Intl. Airport (ONT). But you can book flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be cruising above the clouds in no time.
What day of the week has the most flights from ILG to ONT?
Friday is typically the busiest day for flights, while Tuesday tends to be the quietest.* Just remember that flight schedules can change based on a range 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 is the best time to fly from Wilmington, DE (ILG-New Castle) to Los Angeles - Ontario Intl. Airport (ONT)?
To avoid possible delays on the Wilmington, DE (ILG-New Castle) to Los Angeles - Ontario Intl. Airport (ONT) route, travel before 3 PM. Departures after this time are 22% more likely to be canceled.**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 Wilmington, DE (ILG-New Castle) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Last-minute fares from ILG to ONT are typically more expensive. To secure the lowest rates, start searching for flights ahead of time. That being said, if you're flexible with your travel dates, it's possible to land a cheap ticket right before your trip.
Is it cheaper to book an ILG to ONT flight and hotel package?
Booking an ILG to ONT flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip all in one place. Choose from our extensive range of stays 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 Wilmington, DE (ILG-New Castle) to Los Angeles - Ontario Intl. Airport (ONT)?
Usually, it's possible to cancel or reschedule your ILG to ONT flight. However, if it's been more than 24 hours since booking, additional fees may apply. Check your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find more details on our Customer Service portal.

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*Available to One Key members.