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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 1/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
Jan 16 — Jan 231
Fri 1/16
Fri 1/23
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 December 17, 2025.

This Delta deal was found by Cheapflights users on 12/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/311:35 pmSEA - PHL
1 stop6h 43mDelta
Wed 1/76:00 amPHL - SEA
1 stop7h 42mDelta
Deal found 12/16$297
This United Airlines deal was found by Cheapflights users on 12/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:02 amSEA - PHL
1 stop7h 45mUnited Airlines
Tue 1/66:30 amPHL - SEA
1 stop8h 02mUnited Airlines
Deal found 12/16$356
This United Airlines deal was found by Cheapflights users on 12/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:12 pmSEA - PHL
1 stop8h 57mUnited Airlines
Wed 1/710:30 amPHL - SEA
2 stops13h 45mUnited Airlines
Deal found 12/16$361
This Booking.com deal was found by Cheapflights users on 12/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/292:54 pmSEA - PHL
1 stop11h 37mFrontier
Sun 1/48:36 pmPHL - SEA
1 stop18h 54mFrontier
Deal found 12/16$368
This Alaska Airlines deal was found by Cheapflights users on 12/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/319:29 pmSEA - PHL
Nonstop5h 08mAlaska Airlines
Tue 1/66:44 pmPHL - SEA
Nonstop6h 15mAlaska Airlines
Deal found 12/16$371
This Mytrip deal was found by Cheapflights users on 12/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:20 pmSEA - PHL
1 stop14h 01mMultiple Airlines
Sun 1/48:36 pmPHL - SEA
1 stop18h 54mMultiple Airlines
Deal found 12/16$389
This Alaska Airlines deal was found by Cheapflights users on 12/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/319:29 pmSEA - PHL
Nonstop5h 08mAlaska Airlines
Mon 1/57:00 amPHL - SEA
Nonstop6h 04mAlaska Airlines
Deal found 12/15$406
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/296:26 pmSEA - PHL
1 stop13h 31mMultiple Airlines
Tue 1/67:11 pmPHL - SEA
2 stops40h 53mMultiple Airlines
Deal found 12/16$411
This Expedia deal was found by Cheapflights users on 12/17. 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 12/262:54 pmSEA - PHL
1 stop11h 37mMultiple Airlines
Mon 1/267:06 pmPHL - SEA
Nonstop6h 23mMultiple Airlines
Deal found 12/17$415
This Delta deal was found by Cheapflights users on 12/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2912:55 amSEA - PHL
1 stop6h 43mDelta
Wed 1/76:00 amPHL - SEA
1 stop7h 42mDelta
Deal found 12/16$427
This Kiwi.com deal was found by Cheapflights users on 12/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:34 pmSEA - PHL
1 stop12h 44mMultiple Airlines
Mon 1/51:38 pmPHL - SEA
2 stops31h 13mMultiple Airlines
Deal found 12/15$429
This American Airlines deal was found by Cheapflights users on 12/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2411:59 pmSEA - SBY
1 stop10h 16mAmerican Airlines
Sun 1/46:00 amSBY - SEA
1 stop9h 37mAmerican Airlines
Deal found 12/15$1,001

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 December 17, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$261
(United Airlines)

One-way from

$122
(Frontier)

Popular in

December

Cheapest in

October

Average price

$646
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. 8% potential increase in price ($38 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 17, 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 1/15

7:00 am-5:34 pm

1 stop7h 34m

Philadelphia

Tue 1/20

10:30 am-9:15 pm

2 stops13h 45m

$261

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 1/23

5:00 am-6:54 pm

2 stops10h 54m

Philadelphia

Mon 1/26

3:01 pm-8:57 pm

1 stop8h 56m

$262

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 1/13

5:00 am-5:34 pm

2 stops9h 34m

Philadelphia

Sat 1/17

10:30 am-6:26 pm

2 stops10h 56m

$266

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 2/5

9:54 am-6:03 pm

Nonstop5h 09m

Philadelphia

Mon 2/23

6:20 pm-9:33 pm

Nonstop6h 13m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 1/18

6:05 am-4:28 pm

1 stop7h 23m

Philadelphia

Wed 1/21

6:15 am-10:55 am

1 stop7h 40m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 2/5

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

Sun 1/11

7:00 am-5:34 pm

1 stop7h 34m

Philadelphia

Sun 1/18

5:00 pm-10:43 pm

1 stop8h 43m

$283

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 1/8

11:25 am-11:14 pm

1 stop8h 49m

Philadelphia

Thu 1/15

9:40 am-2:21 pm

1 stop7h 41m

$297

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 1/19

11:10 pm-8:50 am

1 stop6h 40m

Philadelphia

Thu 1/22

6:00 am-10:42 am

1 stop7h 42m

$297

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 1/9

6:05 am-4:28 pm

1 stop7h 23m

Philadelphia

Fri 1/16

2:31 pm-10:50 pm

1 stop11h 19m

$297

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

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 United Airlines and Alaska Airlines 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 2h 25m. 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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