$125 Cheap Flights from Wilmington (ILM) to Ontario (ONT)

View $125 flight on Wed, Jul 2, 2025Opens in a new window

  • Plan, book, fly with confidence

  • trending down icon
    Be in the know
    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon
    Book smarter
    Save up to 30% on select hotels after you book a flight*
  • one key icon
    Earn twice
    Earn your airline miles on top of our OneKeyCash
    Learn about One Key
Find available prices by choosing your travel dates.

Cheap Flights from Wilmington to Ontario (ILM-ONT)

Prices were available within the past 7 days and start at $125 for one-way flights and $297 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sun, May 25 - Fri, May 30
ILM
Wilmington
ONT
Ontario
$297 Roundtrip, found 1 day ago
$297
Roundtrip
found 1 day ago
Select Delta flight, departing Sun, May 25 from Wilmington to Ontario, returning Fri, May 30, priced at $297 found 1 day ago
Delta
Tue, May 20 - Sun, May 25
ILM
Wilmington
ONT
Ontario
$303 Roundtrip, found 18 hours ago
$303
Roundtrip
found 18 hours ago
Select Delta flight, departing Tue, May 20 from Wilmington to Ontario, returning Sun, May 25, priced at $303 found 18 hours ago
Delta
Fri, Jun 27 - Sat, Jul 5
ILM
Wilmington
ONT
Ontario
$308 Roundtrip, found 9 hours ago
$308
Roundtrip
found 9 hours ago
Select Delta flight, departing Fri, Jun 27 from Wilmington to Ontario, returning Sat, Jul 5, priced at $308 found 9 hours ago
American Airlines
Tue, Sep 30 - Sat, Oct 4
ILM
Wilmington
ONT
Ontario
$309 Roundtrip, found 4 hours ago
$309
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Tue, Sep 30 from Wilmington to Ontario, returning Sat, Oct 4, priced at $309 found 4 hours ago
American Airlines
Fri, Jun 6 - Wed, Jun 11
ILM
Wilmington
ONT
Ontario
$314 Roundtrip, found 5 hours ago
$314
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Fri, Jun 6 from Wilmington to Ontario, returning Wed, Jun 11, priced at $314 found 5 hours ago
American Airlines
Fri, May 16 - Tue, May 20
ILM
Wilmington
ONT
Ontario
$318 Roundtrip, found 3 days ago
$318
Roundtrip
found 3 days ago
Select American Airlines flight, departing Fri, May 16 from Wilmington to Ontario, returning Tue, May 20, priced at $318 found 3 days ago
American Airlines
Fri, Jun 6 - Wed, Jun 11
ILM
Wilmington
ONT
Ontario
$319 Roundtrip, found 5 hours ago
$319
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Fri, Jun 6 from Wilmington to Ontario, returning Wed, Jun 11, priced at $319 found 5 hours ago
Delta
Sun, May 25 - Sun, Jun 8
ILM
Wilmington
ONT
Ontario
$328 Roundtrip, found 23 hours ago
$328
Roundtrip
found 23 hours ago
Select Delta flight, departing Sun, May 25 from Wilmington to Ontario, returning Sun, Jun 8, priced at $328 found 23 hours ago
Delta
Fri, May 9 - Sun, May 25
ILM
Wilmington
ONT
Ontario
$333 Roundtrip, found 22 hours ago
$333
Roundtrip
found 22 hours ago
Select Delta flight, departing Fri, May 9 from Wilmington to Ontario, returning Sun, May 25, priced at $333 found 22 hours ago
United
Tue, Jun 10 - Fri, Aug 22
ILM
Wilmington
ONT
Ontario
$344 Roundtrip, found 6 hours ago
$344
Roundtrip
found 6 hours ago
Select United flight, departing Tue, Jun 10 from Wilmington to Ontario, returning Fri, Aug 22, priced at $344 found 6 hours ago

Frequently asked questions

How much does a flight from Wilmington Intl. Airport (ILM) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Discover the latest flight deals from ILM to ONT by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from ILM to ONT?
The cheapest flights from ILM to ONT are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from ILM to ONT?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from ILM to ONT. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Wilmington Intl. Airport (ILM) to Los Angeles - Ontario Intl. Airport (ONT)?
You’ll have to hop on a flight with a layover when traveling from Wilmington Intl. Airport (ILM) to Los Angeles - Ontario Intl. Airport (ONT). Direct flights don’t operate daily on this route. However, just 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 ILM to ONT?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can vary based on various 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 Intl. Airport (ILM) to Los Angeles - Ontario Intl. Airport (ONT)?
Book a flight from Wilmington Intl. Airport (ILM) to Los Angeles - Ontario Intl. Airport (ONT) that leaves before 3 PM to reduce the likelihood of delays. Departures later than this are on average 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 Intl. Airport (ILM) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Waiting until right before your break to book a flight from ILM to ONT often results in higher prices. Although you may find some last-minute discounts, there’s no guarantee. Be flexible with your itinerary for a better chance of scoring a bargain.
Is it cheaper to book an ILM to ONT flight and hotel package?
Opting for an ILM to ONT flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip in one place. Choose from our impressive range of hotels and then add activities, car rentals and flights 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 Intl. Airport (ILM) to Los Angeles - Ontario Intl. Airport (ONT)?
In most cases, you’re able to cancel or reschedule your ILM to ONT flight. However, additional charges may apply, especially if you made your booking over 24 hours ago. Check your itinerary for the airline’s guidelines and fees on flight changes, or if you want more information, head to our Customer Service portal.
*Available to One Key members.