$199 Cheap Flights from Wilmington (ILG) to San Diego (SAN)

View $199 flight on Tue, Jun 3, 2025Opens in a new window

Featured airlines

American Airlines
United
Southwest Airlines
Delta
Spirit Airlines
JetBlue Airways
Frontier Airlines
Air India
Hawaiian Airlines

  • 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

Cheap Flights from Wilmington to San Diego (ILG-SAN)

Prices were available within the past 7 days and start at $199 for one-way flights and $323 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Tue, Jul 29 - Tue, Aug 5
ILG
Wilmington
SAN
San Diego
$323 Roundtrip, found 2 days ago
$323
Roundtrip
found 2 days ago
Select American Airlines flight, departing Tue, Jul 29 from Wilmington to San Diego, returning Tue, Aug 5, priced at $323 found 2 days ago
American Airlines
Tue, Jun 24 - Wed, Jun 25
ILG
Wilmington
SAN
San Diego
$386 Roundtrip, found 1 day ago
$386
Roundtrip
found 1 day ago
Select American Airlines flight, departing Tue, Jun 24 from Wilmington to San Diego, returning Wed, Jun 25, priced at $386 found 1 day ago
American Airlines
Mon, Jun 23 - Thu, Jun 26
ILG
Wilmington
SAN
San Diego
$397 Roundtrip, found 3 days ago
$397
Roundtrip
found 3 days ago
Select American Airlines flight, departing Mon, Jun 23 from Wilmington to San Diego, returning Thu, Jun 26, priced at $397 found 3 days ago
American Airlines
Fri, Jun 13 - Fri, Jun 20
ILG
Wilmington
SAN
San Diego
$413 Roundtrip, found 5 days ago
$413
Roundtrip
found 5 days ago
Select American Airlines flight, departing Fri, Jun 13 from Wilmington to San Diego, returning Fri, Jun 20, priced at $413 found 5 days ago
American Airlines
Tue, Jun 24 - Thu, Jun 26
ILG
Wilmington
SAN
San Diego
$415 Roundtrip, found 1 day ago
$415
Roundtrip
found 1 day ago
Select American Airlines flight, departing Tue, Jun 24 from Wilmington to San Diego, returning Thu, Jun 26, priced at $415 found 1 day ago
American Airlines
Tue, Jul 29 - Tue, Aug 5
ILG
Wilmington
SAN
San Diego
$423 Roundtrip, found 2 days ago
$423
Roundtrip
found 2 days ago
Select American Airlines flight, departing Tue, Jul 29 from Wilmington to San Diego, returning Tue, Aug 5, priced at $423 found 2 days ago
American Airlines
Thu, May 22 - Mon, May 26
ILG
Wilmington
SAN
San Diego
$427 Roundtrip, found 4 days ago
$427
Roundtrip
found 4 days ago
Select American Airlines flight, departing Thu, May 22 from Wilmington to San Diego, returning Mon, May 26, priced at $427 found 4 days ago
American Airlines
Fri, Jun 13 - Fri, Jun 20
ILG
Wilmington
SAN
San Diego
$429 Roundtrip, found 5 days ago
$429
Roundtrip
found 5 days ago
Select American Airlines flight, departing Fri, Jun 13 from Wilmington to San Diego, returning Fri, Jun 20, priced at $429 found 5 days ago
American Airlines
Sat, May 24 - Tue, Jun 10
ILG
Wilmington
SAN
San Diego
$432 Roundtrip, found 1 day ago
$432
Roundtrip
found 1 day ago
Select American Airlines flight, departing Sat, May 24 from Wilmington to San Diego, returning Tue, Jun 10, priced at $432 found 1 day ago
American Airlines
Sat, Jun 14 - Wed, Jul 2
ILG
Wilmington
SAN
San Diego
$437 Roundtrip, found 3 days ago
$437
Roundtrip
found 3 days ago
Select American Airlines flight, departing Sat, Jun 14 from Wilmington to San Diego, returning Wed, Jul 2, priced at $437 found 3 days ago
Flights from Wilmington (ILG) to San Diego (SAN)
Origin airport
New Castle
Destination airport
San Diego Intl.
Roundtrip price
$323
Distance
2346 mi

Wilmington to San Diego Flights

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

 

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

Sunday is one of the best days to book for cheap flights from Wilmington 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 Wilmington 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 Wilmington to San Diego in 2025. You can also book with separate airlines for your outbound and return journeys, from $199 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 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 Wilmington 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.

 

Frequently asked questions

How much does a flight from Wilmington, DE (ILG-New Castle) to San Diego Intl. Airport (SAN) cost?
Discover the latest flight deals from ILG to SAN 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 ILG to SAN?
The cheapest flights from ILG to SAN are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Wilmington, DE (ILG-New Castle) to San Diego Intl. Airport (SAN)?
You can’t take a direct flight to San Diego Intl. Airport (SAN) from Wilmington, DE (ILG-New Castle). However, you can easily travel to San Diego without any layovers by departing from Philadelphia Intl. Airport (PHL).
What is the cheapest airline that flies from ILG to SAN?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from ILG to SAN. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Wilmington, DE (ILG-New Castle) to San Diego Intl. Airport (SAN)?
Nonstop flights from Wilmington, DE (ILG-New Castle) to San Diego Intl. Airport (SAN) aren’t available daily, so you’ll have to take a flight with a layover. Explore your options with our filter tool. Enter your dates and choose either “1 Stop” or “2+ Stops.”
What day of the week has the most flights from ILG to SAN?
You’ll generally find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during public holidays or peak travel times.*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 San Diego Intl. Airport (SAN)?
To avoid potential delays on the Wilmington, DE (ILG-New Castle) to San Diego Intl. Airport (SAN) route, travel before 3 PM. Departures after this time have a 22% higher chance of being 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 San Diego Intl. Airport (SAN) last-minute?
Last-minute bookings from ILG to SAN are typically more expensive. To secure the best rates, start searching for flights well ahead of time. That being said, if you’re flexible with your travel plans, you may score a cheap fare just before your departure.
Is it cheaper to book an ILG to SAN flight and hotel package?
Opting for an ILG to SAN flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip in one place. Pick from our wide range of accommodations and then add car rentals, activities and flights to your booking. Bundle everything 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 San Diego Intl. Airport (SAN)?
Usually, it’s possible to cancel or reschedule your ILG to SAN 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 further details on our Customer Service portal.

Explore a world of travel with Expedia

*Available to One Key members.