$153 Cheap Flights from Seattle (SEA) to Wilmington (ILG)

View $153 flight on Tue, Dec 23, 2025Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Wilmington, DE (ILG-New Castle)

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Cheap Flights from Seattle to Wilmington (SEA-ILG)

Prices were available within the past 7 days and start at $153 for one-way flights and $257 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, Jan 8 - Mon, Jan 12
SEA
Seattle
ILG
Wilmington
$257 Roundtrip, found 4 hours ago
$257
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Thu, Jan 8 from Seattle to Wilmington, returning Mon, Jan 12, priced at $257 found 4 hours ago
American Airlines
Thu, Jan 8 - Mon, Jan 12
SEA
Seattle
ILG
Wilmington
$266 Roundtrip, found 18 hours ago
$266
Roundtrip
found 18 hours ago
Select American Airlines flight, departing Thu, Jan 8 from Seattle to Wilmington, returning Mon, Jan 12, priced at $266 found 18 hours ago
American Airlines
Mon, Jan 5 - Fri, Jan 9
SEA
Seattle
ILG
Wilmington
$287 Roundtrip, found 21 hours ago
$287
Roundtrip
found 21 hours ago
Select American Airlines flight, departing Mon, Jan 5 from Seattle to Wilmington, returning Fri, Jan 9, priced at $287 found 21 hours ago
American Airlines
Tue, Dec 2 - Wed, Dec 3
SEA
Seattle
ILG
Wilmington
$297 Roundtrip, found 1 day ago
$297
Roundtrip
found 1 day ago
Select American Airlines flight, departing Tue, Dec 2 from Seattle to Wilmington, returning Wed, Dec 3, priced at $297 found 1 day ago
American Airlines
Mon, Jan 5 - Fri, Jan 9
SEA
Seattle
ILG
Wilmington
$307 Roundtrip, found 5 days ago
$307
Roundtrip
found 5 days ago
Select American Airlines flight, departing Mon, Jan 5 from Seattle to Wilmington, returning Fri, Jan 9, priced at $307 found 5 days ago
American Airlines
Thu, Jan 15 - Sat, Aug 8
SEA
Seattle
ILG
Wilmington
$312 Roundtrip, found 3 days ago
$312
Roundtrip
found 3 days ago
Select American Airlines flight, departing Thu, Jan 15 from Seattle to Wilmington, returning Sat, Aug 8, priced at $312 found 3 days ago
American Airlines
Tue, Dec 2 - Wed, Dec 3
SEA
Seattle
ILG
Wilmington
$317 Roundtrip, found 1 day ago
$317
Roundtrip
found 1 day ago
Select American Airlines flight, departing Tue, Dec 2 from Seattle to Wilmington, returning Wed, Dec 3, priced at $317 found 1 day ago
American Airlines
Thu, Jan 15 - Sat, Aug 8
SEA
Seattle
ILG
Wilmington
$321 Roundtrip, found 16 hours ago
$321
Roundtrip
found 16 hours ago
Select American Airlines flight, departing Thu, Jan 15 from Seattle to Wilmington, returning Sat, Aug 8, priced at $321 found 16 hours ago
American Airlines
Thu, Jan 15 - Sat, Aug 8
SEA
Seattle
ILG
Wilmington
$332 Roundtrip, found 3 days ago
$332
Roundtrip
found 3 days ago
Select American Airlines flight, departing Thu, Jan 15 from Seattle to Wilmington, returning Sat, Aug 8, priced at $332 found 3 days ago
American Airlines
Thu, Jan 15 - Sat, Aug 8
SEA
Seattle
ILG
Wilmington
$341 Roundtrip, found 16 hours ago
$341
Roundtrip
found 16 hours ago
Select American Airlines flight, departing Thu, Jan 15 from Seattle to Wilmington, returning Sat, Aug 8, priced at $341 found 16 hours ago

Alternative airports near Wilmington

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

Select flight to Philadelphia Intl. PHL. Cheapest option available. Average driving time to city center is 28 minutes. Flights from $380
PHL
Philadelphia Intl.
Cheapest
Average driving time to city center28 min
Flights from $380

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Wilmington, DE (ILG-New Castle) cost?
Snag a cheap one-way flight from $153 or cheap return flight from $257 from Seattle - Tacoma Intl. Airport (SEA) to Wilmington, DE (ILG-New Castle) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Wilmington, DE (ILG-New Castle)?
The cheapest month to fly from SEA to ILG is January, when there's less demand. Off-peak months are usually when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Wilmington, DE (ILG-New Castle)?
Use the filter tool on Expedia to compare different airlines and find the most affordable carrier that'll fly you from SEA to ILG. Then, sort your results by "Price (lowest to highest)" to score the best deal available.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Wilmington, DE (ILG-New Castle)?
You'll have to book a flight with a layover when traveling from Seattle - Tacoma Intl. Airport (SEA) to Wilmington, DE (ILG-New Castle). There are no daily direct flights on this route. However, just filter your search to include one or more stops to discover the best option for your trip.
What day of the week has the most flights from SEA to ILG?
You'll typically find Tuesday the quietest day for flights, while Fridays tend to be 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 Seattle - Tacoma Intl. Airport (SEA) to Wilmington, DE (ILG-New Castle)?
To touch down at Wilmington, DE (ILG-New Castle) without delays, pick a flight that takes off from Seattle - Tacoma Intl. Airport (SEA) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 Seattle - Tacoma Intl. Airport (SEA) to Wilmington, DE (ILG-New Castle) last-minute?
Booking your flight from SEA to ILG right before your getaway is usually more expensive. But if there's some wiggle room with your departure dates and times, you could score a cheap last-minute fare.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Wilmington, DE (ILG-New Castle)?
If you reserved your SEA to ILG flight within the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the fare type you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more information.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
New Castle
Airlines serving
American Airlines
Roundtrip price
$256
Distance
2361 mi

Book with confidence

Seattle to Wilmington Flights

The cheapest times to fly from Seattle to Wilmington

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

 

The best time to book a flight from Seattle to Wilmington

Sunday is one of the best days to book for cheap flights from Seattle to Wilmington: 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 Seattle to Wilmington

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 Seattle to Wilmington in 2025. You can also book with separate airlines for your outbound and return journeys, from $153 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 Seattle to Wilmington 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 Seattle to Wilmington 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.

 

Seattle to Wilmington Flights

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*Available to One Key members.