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Delaware

$144+ 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 1/28. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
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 November 13, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$257
(Alaska Airlines)

One-way from

$144
(United Airlines)

Popular in

December

Cheapest in

October

Average price

$414
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. 9% potential increase in price ($43 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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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 November 13, 2025.

This Alaska Airlines deal was found by Cheapflights users on 11/12. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/49:44 amSEA - PHL
Nonstop5h 09mAlaska Airlines
Sun 12/76:54 pmPHL - SEA
Nonstop6h 18mAlaska Airlines
Deal found 11/12$257
This Kiwi.com deal was found by Cheapflights users on 11/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/249:53 pmSEA - PHL
2 stops23h 46mFrontier
Thu 12/44:12 pmPHL - SEA
1 stop19h 34mFrontier
Deal found 11/11$259
This Kiwi.com deal was found by Cheapflights users on 11/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/19:53 pmSEA - PHL
2 stops37h 28mFrontier
Fri 12/198:36 pmPHL - SEA
1 stop19h 00mFrontier
Deal found 11/11$260
This Kiwi.com deal was found by Cheapflights users on 11/12. 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.
Sun 12/282:54 pmSEA - PHL
1 stop11h 37mFrontier
Sun 1/47:10 amPHL - SEA
1 stop30h 01mFrontier
Deal found 11/12$261
This Kiwi.com deal was found by Cheapflights users on 11/10. 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 12/181:25 pmSEA - PHL
1 stop13h 06mFrontier
Fri 1/94:39 pmPHL - SEA
2 stops24h 02mFrontier
Deal found 11/10$265
This Kiwi.com deal was found by Cheapflights users on 11/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/2312:46 pmSEA - PHL
1 stop12h 59mFrontier
Wed 11/267:40 amPHL - SEA
2 stops31h 16mFrontier
Deal found 11/11$266
This Alaska Airlines deal was found by Cheapflights users on 11/10. 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.
Sun 12/149:35 pmSEA - PHL
Nonstop5h 11mAlaska Airlines
Fri 1/97:06 pmPHL - SEA
Nonstop6h 23mAlaska Airlines
Deal found 11/10$267
This Expedia deal was found by Cheapflights users on 11/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/211:01 pmSEA - PHL
1 stop12h 44mFrontier
Wed 11/266:00 amPHL - SEA
1 stop8h 56mFrontier
Deal found 11/11$268
This Kiwi.com deal was found by Cheapflights users on 11/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/271:01 pmSEA - PHL
1 stop12h 44mFrontier
Mon 12/228:36 pmPHL - SEA
1 stop18h 54mFrontier
Deal found 11/11$272
This Kiwi.com deal was found by Cheapflights users on 11/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/211:01 pmSEA - PHL
1 stop12h 44mFrontier
Fri 12/58:36 pmPHL - SEA
1 stop18h 17mFrontier
Deal found 11/11$273
This Cheapflightsfares deal was found by Cheapflights users on 11/12. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/29:44 amSEA - PHL
Nonstop5h 09mAlaska Airlines
Tue 12/97:06 amPHL - SEA
Nonstop6h 14mAlaska Airlines
Deal found 11/12$274
This American Airlines deal was found by Cheapflights users on 11/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1210:58 pmSEA - SBY
1 stop18h 36mAmerican Airlines
Fri 12/197:55 amSBY - SEA
1 stop17h 09mAmerican Airlines
Deal found 11/12$820

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 November 13, 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

Tue 12/9

9:44 am-5:53 pm

Nonstop5h 09m

Philadelphia

Tue 12/16

7:06 am-10:20 am

Nonstop6h 14m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 12/6

9:35 pm-5:46 am

Nonstop5h 11m

Philadelphia

Tue 12/9

7:06 am-10:20 am

Nonstop6h 14m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 1/10

12:00 pm-12:23 am

1 stop9h 23m

Philadelphia

Sat 1/17

5:40 am-12:20 pm

1 stop9h 40m

$267

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 12/15

11:59 pm-10:51 am

1 stop7h 52m

Philadelphia

Wed 1/7

9:40 am-2:21 pm

1 stop7h 41m

$267

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 1/29

5:00 am-5:27 pm

1 stop9h 27m

Philadelphia

Fri 2/6

4:59 pm-11:15 pm

1 stop9h 16m

$267

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 12/13

7:00 am-5:39 pm

1 stop7h 39m

Philadelphia

Tue 1/13

10:10 am-4:01 pm

1 stop8h 51m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 2/5

7:00 am-5:34 pm

1 stop7h 34m

Philadelphia

Sun 2/8

6:30 am-11:32 am

1 stop8h 02m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 2/4

9:54 am-6:03 pm

Nonstop5h 09m

Philadelphia

Mon 2/9

7:06 pm-10:29 pm

Nonstop6h 23m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 1/23

11:10 pm-8:52 am

1 stop6h 42m

Philadelphia

Sun 1/25

6:00 am-10:47 am

1 stop7h 47m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 12/9

11:00 pm-9:27 am

1 stop7h 27m

Philadelphia

Tue 12/16

6:18 am-12:58 pm

1 stop9h 40m

$277

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/11

Showing 1-10 of 25 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 Alaska Airlines and Delta fly from Seattle to Delaware in about 5h 09m. The time it takes to get you to your destination can typically vary by up to 4h 14m. 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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