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Delaware

$65+ 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 4/24. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
Mar 25 — Apr 11
Wed 3/25
Wed 4/1
1 adult, Economy
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Cheap 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 February 23, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/244:20 pm
SEA
-
PHL
1 stop10h 14m
Frontier
Tue 4/286:05 am
PHL
-
SEA
2 stops14h 37m
Frontier
Deal found 2/22$241
This Expedia deal was found by Cheapflights users on 2/19. 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.
Thu 5/74:20 pm
SEA
-
PHL
1 stop10h 14m
Frontier
Thu 5/148:25 pm
PHL
-
SEA
1 stop21h 40m
Frontier
Deal found 2/19$245
This Kiwi.com deal was found by Cheapflights users on 2/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/204:20 pm
SEA
-
PHL
2 stops13h 51m
Frontier
Tue 4/288:41 pm
PHL
-
SEA
1 stop15h 46m
Frontier
Deal found 2/22$247
This Kiwi.com deal was found by Cheapflights users on 2/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:12 pm
SEA
-
PHL
2 stops25h 27m
Frontier
Tue 4/288:41 pm
PHL
-
SEA
1 stop15h 46m
Frontier
Deal found 2/22$248
This Kiwi.com deal was found by Cheapflights users on 2/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/217:12 pm
SEA
-
PHL
2 stops10h 59m
Frontier
Sun 4/268:41 pm
PHL
-
SEA
1 stop15h 46m
Frontier
Deal found 2/22$249
This Kiwi.com deal was found by Cheapflights users on 2/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2210:57 am
SEA
-
PHL
2 stops15h 37m
Frontier
Thu 4/308:41 pm
PHL
-
SEA
1 stop21h 24m
Frontier
Deal found 2/22$251
This Kiwi.com deal was found by Cheapflights users on 2/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/267:12 pm
SEA
-
PHL
1 stop31h 22m
Frontier
Mon 5/184:42 pm
PHL
-
SEA
2 stops19h 45m
Frontier
Deal found 2/20$252
This CheapOair deal was found by Cheapflights users on 2/22. 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 4/234:20 pm
SEA
-
PHL
1 stop10h 14m
Frontier
Mon 4/278:41 pm
PHL
-
SEA
1 stop15h 46m
Frontier
Deal found 2/22$253
This Kiwi.com deal was found by Cheapflights users on 2/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/316:24 pm
SEA
-
PHL
2 stops32h 07m
Frontier
Sun 4/58:25 pm
PHL
-
SEA
1 stop18h 12m
Frontier
Deal found 2/23$255
This CheapOair deal was found by Cheapflights users on 2/20. 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.
Sun 4/267:12 pm
SEA
-
PHL
1 stop7h 22m
Frontier
Sat 5/28:41 pm
PHL
-
SEA
1 stop15h 46m
Frontier
Deal found 2/20$256
This Kiwi.com deal was found by Cheapflights users on 2/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/114:20 pm
SEA
-
PHL
1 stop10h 14m
Frontier
Fri 5/158:25 pm
PHL
-
SEA
1 stop16h 02m
Frontier
Deal found 2/19$257
This Booking.com deal was found by Cheapflights users on 2/20. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1112:42 pm
SEA
-
PHL
1 stop13h 48m
Frontier
Wed 4/158:41 pm
PHL
-
SEA
1 stop15h 46m
Frontier
Deal found 2/20$258

Find flight deals from Seattle to Delaware

Keep the following information in mind while searching for Seattle to Delaware flight deals. Data was last updated February 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$241
(Kiwi.com)

One-way from

$65
(Kiwi.com)

Popular in

February

Cheapest in

January

Average price

$567
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. 0% potential increase in price ($0 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 February 2026
Search Deals

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 February 23, 2026.
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

Wed 4/29

7:35 pm-5:59 am

1 stop7h 24m

Philadelphia

Fri 5/8

7:10 am-10:00 am

Nonstop5h 50m

$287

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 3/18

5:30 am-5:28 pm

1 stop8h 58m

Philadelphia

Wed 4/15

6:00 am-10:55 am

1 stop7h 55m

$297

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 4/9

5:15 am-3:50 pm

1 stop7h 35m

Philadelphia

Wed 4/15

5:50 am-1:35 pm

2 stops10h 45m

$302

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 4/26

9:44 pm-6:02 am

Nonstop5h 18m

Philadelphia

Thu 4/30

7:22 am-10:20 am

Nonstop5h 58m

$367

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 3/18

11:59 pm-10:14 am

1 stop7h 15m

Philadelphia

Wed 4/15

1:27 pm-11:27 pm

2 stops13h 00m

$402

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 5/22

11:59 pm-10:32 am

1 stop7h 33m

Philadelphia

Sun 5/24

6:10 am-10:25 am

1 stop7h 15m

$427

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 4/29

11:59 pm-2:20 pm

2 stops11h 21m

Philadelphia

Fri 5/8

6:06 pm-1:12 am

1 stop10h 06m

$432

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 3/27

11:59 pm-9:09 pm

1 stop18h 10m

Philadelphia

Wed 4/1

11:36 am-9:06 pm

2 stops12h 30m

$534

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 5/13

9:20 pm-5:37 am

Nonstop5h 17m

Philadelphia

Sun 5/17

7:10 am-10:00 am

Nonstop5h 50m

$557

SeattleSalisbury

SEA - SBY

SEASBY

Seattle/Tacoma Intl

Mon 4/6

10:57 pm-10:54 pm

1 stop20h 57m

Salisbury-Ocean City

Mon 4/13

6:38 am-9:23 pm

1 stop17h 45m

$638

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/21

Showing 1-10 of 26 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
No data available for this route at this time. Please check back soon.

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.

  • How long is the flight from Seattle to Delaware?

    Airlines like Delta, Southwest, and Alaska Airlines fly from Seattle to Delaware in about 5h 18m. The time it takes to get you to your destination can typically vary by up to 2h 17m. Seattle and Delaware are separated by a distance of 2370 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    To fly one-way, consider booking your trip with Qatar Airways, which is currently one of the cheapest options available, starting at $413. Royal Jordanian flights start at $450 while deals on Turkish Airlines start at $577 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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