HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Delaware

$139+ Cheap flights from Seattle (SEA) to Delaware

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Delaware with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Seattle to Delaware

Keep the following information in mind while searching for Seattle to Delaware flight deals. Data was last updated March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$297
(CheapOair)

One-way from

$139
(American Airlines)

Popular in

December

Cheapest in

April

Average price

$404
Provider with most accurate pricing for Seattle/Tacoma Intl-Philadelphia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Philadelphia flights.
Search Deals
From Seattle/Tacoma Intl to Delaware
Search Deals
One-way flight from Seattle/Tacoma Intl to Delaware
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($20 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2025
Search Deals

Find flight deals from Seattle to Delaware

Cheapest flights from Seattle to Delaware
Explore the most affordable flight options available from Seattle to Delaware. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.

This CheapOair deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/247:35 pmSEA - PHL
1 stop30h 31mSpirit Airlines
Sun 4/2710:08 pmPHL - SEA
1 stop16h 27mSpirit Airlines
Deal found 3/27$297
This Expedia deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1512:30 pmSEA - PHL
1 stop14h 22mMultiple Airlines
Tue 4/297:04 amPHL - SEA
Nonstop5h 55mMultiple Airlines
Deal found 3/26$302
This CheapOair deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/14:16 pmSEA - PHL
1 stop11h 31mFrontier
Thu 4/37:30 amPHL - SEA
1 stop30h 09mFrontier
Deal found 3/27$310
This American Airlines deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/412:12 pmSEA - PHL
Nonstop5h 13mAmerican Airlines
Tue 7/225:00 amPHL - SEA
1 stop8h 50mAmerican Airlines
Deal found 3/26$312
This Delta deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/112:45 amSEA - PHL
1 stop6h 51mDelta
Wed 5/76:00 amPHL - SEA
1 stop9h 59mDelta
Deal found 3/27$322
This Southwest deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/3110:55 pmSEA - PHL
1 stop7h 30mSouthwest
Mon 8/46:00 pmPHL - SEA
2 stops9h 25mSouthwest
Deal found 3/27$362
This United Airlines deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/2611:45 pmSEA - PHL
1 stop8h 02mUnited Airlines
Mon 6/307:59 pmPHL - SEA
1 stop7h 57mUnited Airlines
Deal found 3/27$393
This Hawaiian Airlines deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/219:45 pmSEA - PHL
Nonstop5h 16mHawaiian Airlines
Sun 11/237:25 amPHL - SEA
Nonstop6h 12mHawaiian Airlines
Deal found 3/27$407
This Alaska Airlines deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/129:29 pmSEA - PHL
Nonstop5h 15mAlaska Airlines
Fri 6/206:52 pmPHL - SEA
Nonstop6h 05mAlaska Airlines
Deal found 3/26$452
This American Airlines deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/289:50 pmSEA - SBY
1 stop7h 54mAmerican Airlines
Sat 7/55:00 amSBY - SEA
1 stop10h 20mAmerican Airlines
Deal found 3/27$686

Cheapflights Fare Finder

Customize your flight search to find flights from Seattle to Delaware that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 28, 2025.
Use the filters below to find and compare flights from Seattle to Delaware that are best for you.

Fly from

Seattle

Fly to

Delaware

Route

Depart

Return

Price

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 4/24

7:35 pm-5:06 am

1 stop30h 31m

Philadelphia

Sun 4/27

10:08 pm-11:35 am

1 stop16h 27m

$297

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 4/15

12:30 pm-5:52 am

1 stop14h 22m

Philadelphia

Tue 4/29

7:04 am-9:59 am

Nonstop5h 55m

$302

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 4/1

4:16 pm-6:47 am

1 stop11h 31m

Philadelphia

Thu 4/3

7:30 am-10:39 am

1 stop30h 09m

$310

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 5/1

12:59 am-11:55 am

1 stop7h 56m

Philadelphia

Wed 5/7

6:45 pm-9:50 pm

Nonstop6h 05m

$317

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 5/1

12:45 am-10:36 am

1 stop6h 51m

Philadelphia

Wed 5/7

6:00 am-12:59 pm

1 stop9h 59m

$322

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 4/29

9:29 pm-5:44 am

Nonstop5h 15m

Philadelphia

Thu 5/8

7:04 am-9:59 am

Nonstop5h 55m

$427

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 5/13

7:00 am-11:35 pm

2 stops13h 35m

Philadelphia

Tue 6/17

7:59 pm-12:59 am

1 stop8h 00m

$432

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 4/14

9:54 pm-6:00 am

Nonstop5h 06m

Philadelphia

Wed 9/3

7:05 am-9:57 am

Nonstop5h 52m

$447

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 5/31

5:10 am-9:15 pm

2 stops13h 05m

Philadelphia

Mon 6/23

7:10 pm-12:25 am

1 stop8h 15m

$449

SeattleSalisbury

SEA - SBY

SEASBY

Seattle/Tacoma Intl

Fri 6/20

5:30 am-6:29 pm

1 stop9h 59m

Salisbury-Ocean City

Fri 6/27

6:29 am-11:12 am

1 stop7h 43m

$820

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 21 results
1
2
3

Best time to book a flight from Seattle to Delaware

Have a flexible travel schedule? Discover the best time to fly to Delaware from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Delaware

Rainfall in Delaware by month

Plan your trip to Delaware by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Delaware ranges from 2.9 - 4.3 inches per month. July is typically the wettest month, when rainfall can reach 4.3 in. February is typically the driest time to visit Delaware when rainfall is around 2.9 in.

Temperature in Delaware by month

Plan your trip to Delaware by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Delaware, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 77.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing Delaware

Get insights into the airlines that provide service to Delaware. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Delaware. Reviews last updated March 28, 2025.
Read through reviews of airlines operating flights from Seattle to Delaware, such as Southwest, Alaska Airlines and Delta. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Comfort

8.1

Boarding

8.2

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.1
Very good
4,273 reviews
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Comfort

8.1

Boarding

8.2

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Alaska Airlines
8.0
Very good
9,798 reviews
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Comfort

8.1

Boarding

8.2

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,896 reviews
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Comfort

8.1

Boarding

8.2

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Hawaiian Airlines
7.9
Good
2,336 reviews
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Comfort

8.1

Boarding

8.2

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,603 reviews
Southwest
8.1
Very good
4,273 reviews

Entertainment

7.6

Overall

8.1

Food

7.1

Comfort

8.1

Boarding

8.2

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Delaware. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to Delaware?

    Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to Delaware. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

  • What are the cheapest airlines to fly from Seattle to Delaware one-way?

    To fly one-way, consider booking your trip with American Airlines, which is currently one of the cheapest options available, starting at $139. Spirit Airlines flights start at $140 while deals on Delta start at $144 one-way.

  • Can I find deals for flights from Seattle to Delaware that include hotel bookings?

    Yes. In addition to deals on Seattle to Delaware flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Delaware?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Delaware.

  • Can I find deals for business class flights from Seattle to Delaware?

    Yes. Cheapflights offers flight deals from Seattle to Delaware by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Delaware

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Sky Harbor Intl flights
Seattle to Las Vegas flights
Seattle to Los Angeles flights
Seattle to Newark flights
Seattle to Dallas/Fort Worth flights
Seattle to John F Kennedy Intl flights
Seattle to San Diego flights
Seattle to Honolulu flights
Seattle to Santa Ana flights
Portland to Los Angeles flights
Seattle to Burbank flights
Seattle to Hobby flights
Seattle to San Francisco flights
Seattle to O'Hare Intl flights
Seattle to Reagan-National flights
Seattle to Ontario flights
Seattle to Boston flights
Seattle to LaGuardia flights
Portland to Las Vegas flights
Seattle to Denver flights
Seattle to Orlando flights
Seattle to Kahului flights
Seattle to Dulles Intl flights
Seattle to San Jose flights
Seattle to George Bush Intcntl flights
Seattle to Oakland flights
Seattle to Austin flights
Everett to Las Vegas flights
Seattle to Palm Springs flights
Portland to Sky Harbor Intl flights
Seattle to New Orleans flights
Seattle to Salt Lake City flights
Portland to Newark flights
Seattle to Atlanta flights
Seattle to Philadelphia flights
Everett to Los Angeles flights
Seattle to Miami flights
Portland to John F Kennedy Intl flights
Portland to Dallas/Fort Worth flights
Seattle to Kailua-Kona flights
Portland to Honolulu flights
Seattle to Minneapolis flights
Seattle to Detroit flights
Seattle to Nashville flights
Seattle to Midway flights
Portland to San Diego flights
Seattle to Lihue flights
Portland to Denver flights
Seattle to Baltimore flights
Everett to Sky Harbor Intl flights
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.