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

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
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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.

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.

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.

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.
8.0
Very good

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.

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.

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

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