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Delaware

$149+ 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 11/13. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
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 September 16, 2025.

Round-trip from

$277
(Delta)

One-way from

$149
(Alaska Airlines)

Popular in

December

Cheapest in

March

Average price

$417
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. 6% potential increase in price ($28 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 16, 2025.

This Delta deal was found by Cheapflights users on 9/15. 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 11/207:12 pmSEA - PHL
1 stop7h 43mDelta
Mon 11/247:10 amPHL - SEA
1 stop10h 44mDelta
Deal found 9/15$277
This CheapOair deal was found by Cheapflights users on 9/16. 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 9/307:00 amSEA - PHL
2 stops27h 50mFrontier
Sat 10/117:10 pmPHL - SEA
2 stops39h 23mFrontier
Deal found 9/16$280
This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Sun 10/128:43 pmSEA - PHL
2 stops34h 51mFrontier
Thu 10/236:42 amPHL - SEA
1 stop27h 51mFrontier
Deal found 9/13$281
This CheapOair deal was found by Cheapflights users on 9/14. 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.
Fri 11/78:22 pmSEA - PHL
2 stops32h 59mFrontier
Sat 11/156:26 pmPHL - SEA
2 stops20h 47mFrontier
Deal found 9/14$282
This CheapOair deal was found by Cheapflights users on 9/14. 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.
Mon 10/1310:16 amSEA - PHL
2 stops29h 28mFrontier
Mon 10/205:20 amPHL - SEA
2 stops33h 47mFrontier
Deal found 9/14$283
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/66:12 amSEA - PHL
2 stops15h 24mFrontier
Thu 10/96:32 amPHL - SEA
1 stop8h 35mFrontier
Deal found 9/15$284
This CheapOair deal was found by Cheapflights users on 9/15. 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 10/211:02 pmSEA - PHL
2 stops17h 25mFrontier
Wed 10/295:27 pmPHL - SEA
2 stops21h 46mFrontier
Deal found 9/15$285
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 11/142:22 pmSEA - PHL
1 stop11h 27mFrontier
Wed 11/198:00 amPHL - SEA
2 stops30h 56mFrontier
Deal found 9/14$287
This CheapOair deal was found by Cheapflights users on 9/14. 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.
Sat 10/47:00 amSEA - PHL
2 stops23h 15mFrontier
Wed 10/85:53 pmPHL - SEA
2 stops21h 14mFrontier
Deal found 9/14$288
This Hawaiian Airlines deal was found by Cheapflights users on 9/15. 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.
Wed 10/229:45 amSEA - PHL
Nonstop5h 26mHawaiian Airlines
Wed 10/227:11 pmPHL - SEA
Nonstop6h 18mHawaiian Airlines
Deal found 9/15$291
This Southwest deal was found by Cheapflights users on 9/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/155:40 amSEA - PHL
1 stop13h 55mSouthwest
Tue 12/235:40 pmPHL - SEA
1 stop9h 55mSouthwest
Deal found 9/13$292
This American Airlines deal was found by Cheapflights users on 9/13. 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.
Sat 10/411:38 pmSEA - SBY
1 stop8h 13mAmerican Airlines
Tue 10/76:03 amSBY - SEA
1 stop8h 27mAmerican Airlines
Deal found 9/13$782

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 September 16, 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

Wed 11/19

1:39 pm-11:50 pm

1 stop7h 11m

Philadelphia

Sun 11/23

6:00 am-10:54 am

1 stop7h 54m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 10/10

9:23 pm-5:40 am

Nonstop5h 17m

Philadelphia

Tue 10/14

7:00 am-9:49 am

Nonstop5h 49m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 12/11

9:35 pm-5:46 am

Nonstop5h 11m

Philadelphia

Tue 12/16

6:54 pm-10:12 pm

Nonstop6h 18m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 10/6

11:40 pm-11:56 am

1 stop9h 16m

Philadelphia

Thu 10/9

6:34 am-2:24 pm

1 stop10h 50m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 10/10

11:55 pm-10:56 am

1 stop8h 01m

Philadelphia

Fri 10/17

6:50 pm-11:59 pm

1 stop8h 09m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 11/5

1:40 pm-12:52 am

1 stop8h 12m

Philadelphia

Sun 11/9

6:47 pm-12:11 am

1 stop8h 24m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 11/20

7:12 pm-5:55 am

1 stop7h 43m

Philadelphia

Sun 11/23

7:10 am-12:56 pm

1 stop8h 46m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 11/21

5:00 pm-5:55 am

1 stop9h 55m

Philadelphia

Mon 11/24

7:10 am-2:54 pm

1 stop10h 44m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 10/4

6:00 am-6:06 pm

1 stop9h 06m

Philadelphia

Wed 10/8

6:00 am-10:45 am

1 stop7h 45m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 11/21

5:00 pm-5:55 am

1 stop9h 55m

Philadelphia

Sun 11/23

7:10 am-2:54 pm

1 stop10h 44m

$277

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 24 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, Hawaiian Airlines, and American Airlines fly from Seattle to Delaware in about 5h 17m. The time it takes to get you to your destination can typically vary by up to 2h 56m. 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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