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Delaware

$143+ 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 12/15. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
Nov 22 — Nov 291
Sat 11/22
Sat 11/29
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 October 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$252
(Priceline)

One-way from

$143
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$357
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. 8% potential increase in price ($40 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in October 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 October 23, 2025.

This Priceline deal was found by Cheapflights users on 10/21. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/51:37 pmSEA - PHL
1 stop12h 12mFrontier
Mon 11/106:19 amPHL - SEA
1 stop8h 54mFrontier
Deal found 10/21$252
This Kiwi.com deal was found by Cheapflights users on 10/23. 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.
Wed 11/121:37 pmSEA - PHL
1 stop12h 12mFrontier
Sun 11/233:25 pmPHL - SEA
1 stop20h 02mFrontier
Deal found 10/23$253
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 10/312:22 pmSEA - PHL
1 stop11h 27mMultiple Airlines
Thu 11/138:05 pmPHL - SEA
1 stop25h 27mMultiple Airlines
Deal found 10/21$254
This Booking.com deal was found by Cheapflights users on 10/22. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/61:08 pmSEA - PHL
1 stop12h 41mFrontier
Mon 11/106:19 amPHL - SEA
1 stop8h 54mFrontier
Deal found 10/22$255
This Kiwi.com deal was found by Cheapflights users on 10/23. 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.
Thu 11/1312:58 pmSEA - PHL
1 stop12h 51mMultiple Airlines
Sun 11/2311:14 amPHL - SEA
2 stops29h 08mMultiple Airlines
Deal found 10/23$256
This Alaska Airlines deal was found by Cheapflights users on 10/22. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/149:30 pmSEA - PHL
Nonstop5h 12mAlaska Airlines
Sun 11/167:02 amPHL - SEA
Nonstop6h 11mAlaska Airlines
Deal found 10/22$257
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 10/291:58 pmSEA - PHL
1 stop11h 51mMultiple Airlines
Thu 11/138:05 pmPHL - SEA
1 stop25h 27mMultiple Airlines
Deal found 10/21$258
This American Airlines deal was found by Cheapflights users on 10/21. 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 10/3112:03 pmSEA - PHL
Nonstop5h 22mAmerican Airlines
Fri 11/146:50 pmPHL - SEA
Nonstop6h 30mAmerican Airlines
Deal found 10/21$262
This Frontier deal was found by Cheapflights users on 10/23. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1312:58 pmSEA - PHL
1 stop12h 51mFrontier
Fri 11/216:00 amPHL - SEA
1 stop8h 56mFrontier
Deal found 10/23$263
This Travelocity deal was found by Cheapflights users on 10/23. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/121:37 pmSEA - PHL
1 stop12h 12mMultiple Airlines
Mon 11/177:12 pmPHL - SEA
Nonstop6h 18mMultiple Airlines
Deal found 10/23$264
This Kiwi.com deal was found by Cheapflights users on 10/22. 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.
Thu 11/201:01 pmSEA - PHL
1 stop12h 44mMultiple Airlines
Thu 12/410:22 amPHL - SEA
2 stops25h 24mMultiple Airlines
Deal found 10/22$265
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 10/312:22 pmSEA - PHL
1 stop11h 27mFrontier
Sat 11/156:26 pmPHL - SEA
2 stops44h 47mFrontier
Deal found 10/21$266

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 October 23, 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 12/11

9:35 pm-5:46 am

Nonstop5h 11m

Philadelphia

Tue 12/16

7:06 am-10:20 am

Nonstop6h 14m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 12/3

11:55 pm-10:53 am

1 stop7h 58m

Philadelphia

Tue 12/9

11:46 am-5:00 pm

1 stop8h 14m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 1/8

9:25 am-9:52 pm

1 stop9h 27m

Philadelphia

Sun 1/11

5:00 pm-10:43 pm

1 stop8h 43m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 11/11

11:55 pm-10:51 am

1 stop7h 56m

Philadelphia

Sat 11/15

12:42 pm-6:40 pm

1 stop8h 58m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 11/14

7:12 pm-5:55 am

1 stop7h 43m

Philadelphia

Sat 11/15

5:03 pm-11:59 pm

1 stop9h 56m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 12/3

2:03 pm-12:51 am

1 stop7h 48m

Philadelphia

Sun 12/7

6:00 am-10:40 am

1 stop7h 40m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 11/14

7:12 pm-5:55 am

1 stop7h 43m

Philadelphia

Sun 11/16

6:14 am-10:54 am

1 stop7h 40m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 12/4

11:00 pm-9:27 am

1 stop7h 27m

Philadelphia

Sun 12/7

6:18 am-10:54 am

1 stop7h 36m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 11/15

11:55 pm-10:51 am

1 stop7h 56m

Philadelphia

Wed 11/19

6:59 pm-12:01 am

1 stop8h 02m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 11/12

9:30 pm-5:42 am

Nonstop5h 12m

Philadelphia

Fri 11/14

7:02 am-10:13 am

Nonstop6h 11m

$297

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/23

Showing 1-10 of 27 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, Delta, and United Airlines fly from Seattle to Delaware in about 5h 11m. The time it takes to get you to your destination can typically vary by up to 4h 16m. 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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