$234 Cheap Flights from Wilmington (ILG) to San Diego (SAN)

View $234 flight on Tue, Sep 30, 2025Opens in a new window

Popular airlines from Wilmington, DE (ILG-New Castle) to San Diego Intl. Airport (SAN)

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

Prices were available within the past 7 days and start at $234 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
Sat, Oct 18 - Sat, Oct 25
ILG
Wilmington
SAN
San Diego
$323 Roundtrip, found 4 days ago
$323
Roundtrip
found 4 days ago
Select American Airlines flight, departing Sat, Oct 18 from Wilmington to San Diego, returning Sat, Oct 25, priced at $323 found 4 days ago
American Airlines
Thu, Sep 18 - Tue, Sep 23
ILG
Wilmington
SAN
San Diego
$331 Roundtrip, found 20 hours ago
$331
Roundtrip
found 20 hours ago
Select American Airlines flight, departing Thu, Sep 18 from Wilmington to San Diego, returning Tue, Sep 23, priced at $331 found 20 hours ago
American Airlines
Sat, Oct 18 - Sat, Oct 25
ILG
Wilmington
SAN
San Diego
$333 Roundtrip, found 4 days ago
$333
Roundtrip
found 4 days ago
Select American Airlines flight, departing Sat, Oct 18 from Wilmington to San Diego, returning Sat, Oct 25, priced at $333 found 4 days ago
American Airlines
Thu, Sep 18 - Tue, Sep 23
ILG
Wilmington
SAN
San Diego
$341 Roundtrip, found 2 days ago
$341
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Sep 18 from Wilmington to San Diego, returning Tue, Sep 23, priced at $341 found 2 days ago
American Airlines
Wed, Oct 8 - Mon, Oct 13
ILG
Wilmington
SAN
San Diego
$341 Roundtrip, found 3 days ago
$341
Roundtrip
found 3 days ago
Select American Airlines flight, departing Wed, Oct 8 from Wilmington to San Diego, returning Mon, Oct 13, priced at $341 found 3 days ago
American Airlines
Thu, Sep 18 - Tue, Sep 23
ILG
Wilmington
SAN
San Diego
$349 Roundtrip, found 5 days ago
$349
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Sep 18 from Wilmington to San Diego, returning Tue, Sep 23, priced at $349 found 5 days ago
American Airlines
Thu, Sep 18 - Tue, Sep 23
ILG
Wilmington
SAN
San Diego
$351 Roundtrip, found 4 days ago
$351
Roundtrip
found 4 days ago
Select American Airlines flight, departing Thu, Sep 18 from Wilmington to San Diego, returning Tue, Sep 23, priced at $351 found 4 days ago
American Airlines
Sat, Oct 18 - Sat, Oct 25
ILG
Wilmington
SAN
San Diego
$359 Roundtrip, found 4 days ago
$359
Roundtrip
found 4 days ago
Select American Airlines flight, departing Sat, Oct 18 from Wilmington to San Diego, returning Sat, Oct 25, priced at $359 found 4 days ago
American Airlines
Thu, Sep 18 - Tue, Sep 23
ILG
Wilmington
SAN
San Diego
$369 Roundtrip, found 5 days ago
$369
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Sep 18 from Wilmington to San Diego, returning Tue, Sep 23, priced at $369 found 5 days ago
American Airlines
Fri, Oct 24 - Sun, Oct 26
ILG
Wilmington
SAN
San Diego
$375 Roundtrip, found 10 hours ago
$375
Roundtrip
found 10 hours ago
Select American Airlines flight, departing Fri, Oct 24 from Wilmington to San Diego, returning Sun, Oct 26, priced at $375 found 10 hours ago

Alternative airports near San Diego

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

Select flight to San Diego Intl. SAN. Cheapest and Closest option available. Average driving time to city center is 5 minutes. Flights from $432
SAN
San Diego Intl.
CheapestClosest
Average driving time to city center5 min
Flights from $432
Flights from Wilmington (ILG) to San Diego (SAN)
Origin airport
New Castle
Destination airport
San Diego Intl.
Airlines serving
American Airlines
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 October. 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 $234 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?
Snag a cheap one-way flight from $234 or cheap return flight from $323 from Wilmington, DE (ILG-New Castle) to San Diego Intl. Airport (SAN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Wilmington, DE (ILG-New Castle) to San Diego Intl. Airport (SAN)?
Traveling in October may help you find better deals, as it's the cheapest month for flights between ILG and SAN. You'll typically find the lowest fares during off-peak months.
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 Wilmington, DE (ILG-New Castle) to San Diego Intl. Airport (SAN)?
To find the cheapest airline that'll fly you from ILG to SAN, use Expedia's filter tool. Tailor your search based on what's important to you, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to see the cheapest flights first.
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.

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*Available to One Key members.