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Delaware

$122+ 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 3/13. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
Feb 13 — Feb 201
Fri 2/13
Fri 2/20
1 adult, Economy
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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 January 14, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$257
(Alaska Airlines)

One-way from

$122
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$366
Provider with most accurate pricing for Seattle/Tacoma Intl-Philadelphia flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Philadelphia flights.
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From Seattle/Tacoma Intl to Delaware
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One-way flight from Seattle/Tacoma Intl to Delaware
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Highest demand for flights based on searches. 2% potential increase in price ($12 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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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 January 14, 2026.

This Alaska Airlines deal was found by Cheapflights users on 1/13. 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.
Tue 4/289:44 pm
SEA
-
PHL
Nonstop5h 18m
Alaska Airlines
Thu 5/77:22 am
PHL
-
SEA
Nonstop5h 58m
Alaska Airlines
Deal found 1/13$257
This Kiwi.com deal was found by Cheapflights users on 1/13. 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 3/1612:24 pm
SEA
-
PHL
2 stops29h 41m
Frontier
Thu 3/198:25 pm
PHL
-
SEA
1 stop17h 54m
Frontier
Deal found 1/13$259
This Kiwi.com deal was found by Cheapflights users on 1/12. 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.
Thu 2/191:16 pm
SEA
-
PHL
1 stop25h 39m
Frontier
Wed 2/2511:40 am
PHL
-
SEA
2 stops27h 21m
Frontier
Deal found 1/12$260
This United Airlines deal was found by Cheapflights users on 1/11. 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.
Mon 2/27:30 pm
SEA
-
PHL
2 stops11h 08m
United Airlines
Thu 2/56:30 am
PHL
-
SEA
1 stop8h 02m
United Airlines
Deal found 1/11$262
This Alaska Airlines deal was found by Cheapflights users on 1/13. 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.
Fri 2/209:16 am
SEA
-
PHL
Nonstop5h 04m
Alaska Airlines
Tue 2/246:20 pm
PHL
-
SEA
Nonstop6h 13m
Alaska Airlines
Deal found 1/13$267
This Booking.com deal was found by Cheapflights users on 1/12. 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.
Thu 2/121:16 pm
SEA
-
PHL
1 stop25h 39m
Frontier
Sun 2/225:42 pm
PHL
-
SEA
1 stop20h 37m
Frontier
Deal found 1/12$268
This Kiwi.com deal was found by Cheapflights users on 1/13. 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 3/2410:08 pm
SEA
-
PHL
2 stops23h 44m
Frontier
Thu 4/28:36 pm
PHL
-
SEA
1 stop18h 54m
Frontier
Deal found 1/13$270
This Kiwi.com deal was found by Cheapflights users on 1/13. 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.
Thu 3/1212:24 pm
SEA
-
PHL
1 stop14h 07m
Frontier
Wed 3/1812:46 pm
PHL
-
SEA
2 stops35h 17m
Frontier
Deal found 1/13$271
This Kiwi.com deal was found by Cheapflights users on 1/13. 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.
Thu 2/191:16 pm
SEA
-
PHL
1 stop25h 39m
Frontier
Thu 2/266:00 am
PHL
-
SEA
2 stops29h 13m
Frontier
Deal found 1/13$272
This Kiwi.com deal was found by Cheapflights users on 1/13. 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.
Thu 2/261:16 pm
SEA
-
PHL
1 stop25h 39m
Multiple Airlines
Tue 3/37:46 pm
PHL
-
SEA
2 stops39h 27m
Multiple Airlines
Deal found 1/13$275
This Alaska Airlines deal was found by Cheapflights users on 1/13. 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.
Thu 4/309:44 pm
SEA
-
PHL
Nonstop5h 18m
Alaska Airlines
Thu 5/77:22 am
PHL
-
SEA
Nonstop5h 58m
Alaska Airlines
Deal found 1/13$277
This American Airlines deal was found by Cheapflights users on 1/13. 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 5/298:20 am
SEA
-
SBY
1 stop11h 40m
American Airlines
Sun 5/316:41 am
SBY
-
SEA
1 stop17h 30m
American Airlines
Deal found 1/13$787

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 January 14, 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

Tue 3/3

7:00 am-5:14 pm

1 stop7h 14m

Philadelphia

Tue 3/10

5:10 pm-10:45 pm

1 stop8h 35m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 3/27

9:55 pm-6:05 am

Nonstop5h 10m

Philadelphia

Tue 3/31

7:25 am-10:30 am

Nonstop6h 05m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 5/2

5:35 am-5:35 pm

1 stop9h 00m

Philadelphia

Tue 5/5

6:45 pm-11:59 pm

1 stop8h 14m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 2/2

9:25 am-9:52 pm

1 stop9h 27m

Philadelphia

Thu 2/5

10:10 am-4:01 pm

1 stop8h 51m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 5/2

8:56 am-7:26 pm

1 stop7h 30m

Philadelphia

Wed 5/6

6:17 am-11:39 am

1 stop8h 22m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 3/11

11:15 pm-8:50 am

1 stop6h 35m

Philadelphia

Mon 3/16

5:00 pm-11:54 pm

1 stop9h 54m

$267

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 2/14

11:10 pm-8:50 am

1 stop6h 40m

Philadelphia

Mon 2/16

6:50 pm-12:09 am

1 stop8h 19m

$267

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 4/30

9:44 pm-6:02 am

Nonstop5h 18m

Philadelphia

Sun 5/3

6:58 pm-10:02 pm

Nonstop6h 04m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 5/22

9:27 pm-5:40 am

Nonstop5h 13m

Philadelphia

Sun 5/24

7:00 am-9:59 am

Nonstop5h 59m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 2/12

5:30 am-5:38 pm

1 stop9h 08m

Philadelphia

Mon 2/16

6:50 pm-12:09 am

1 stop8h 19m

$277

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/14

Showing 1-10 of 22 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 United Airlines, Alaska Airlines, and Delta fly from Seattle to Delaware in about 5h 10m. The time it takes to get you to your destination can typically vary by up to 3h 50m. 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.

  • 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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