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Delaware

$128+ 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 11/27. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
Dec 18 — Dec 251
Thu 12/18
Thu 12/25
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 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$255
(Kiwi.com)

One-way from

$128
(Trip.com)

Popular in

December

Cheapest in

October

Average price

$433
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 ($41 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 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 18, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/18. 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 12/41:09 pmSEA - PHL
2 stops22h 30mFrontier
Sun 12/78:36 pmPHL - SEA
1 stop18h 17mFrontier
Deal found 11/18$255
This Alaska Airlines deal was found by Cheapflights users on 11/17. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/119:44 amSEA - PHL
Nonstop5h 09mAlaska Airlines
Mon 12/156:54 pmPHL - SEA
Nonstop6h 18mAlaska Airlines
Deal found 11/17$257
This eDestinos deal was found by Cheapflights users on 11/15. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:33 pmSEA - PHL
1 stop8h 07mFrontier
Mon 1/58:36 pmPHL - SEA
1 stop19h 46mFrontier
Deal found 11/15$266
This Kiwi.com deal was found by Cheapflights users on 11/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/153:40 pmSEA - PHL
1 stop10h 51mFrontier
Mon 12/228:36 pmPHL - SEA
1 stop18h 54mFrontier
Deal found 11/17$269
This Orbitz deal was found by Cheapflights users on 11/17. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/89:45 amSEA - PHL
1 stop11h 49mMultiple Airlines
Thu 12/117:06 amPHL - SEA
Nonstop6h 14mMultiple Airlines
Deal found 11/17$270
This Alaska Airlines deal was found by Cheapflights users on 11/18. 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 12/259:29 pmSEA - PHL
Nonstop5h 08mAlaska Airlines
Fri 1/97:06 pmPHL - SEA
Nonstop6h 23mAlaska Airlines
Deal found 11/18$272
This WAYA deal was found by Cheapflights users on 11/18. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/53:40 pmSEA - PHL
1 stop10h 51mMultiple Airlines
Wed 12/107:06 amPHL - SEA
Nonstop6h 14mMultiple Airlines
Deal found 11/18$275
This Delta deal was found by Cheapflights users on 11/18. 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 12/3110:55 pmSEA - PHL
1 stop7h 30mDelta
Mon 1/122:31 pmPHL - SEA
1 stop11h 19mDelta
Deal found 11/18$277
This Delta deal was found by Cheapflights users on 11/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/87:11 pmSEA - PHL
1 stop7h 39mDelta
Sun 12/146:00 amPHL - SEA
1 stop7h 40mDelta
Deal found 11/17$278
This United Airlines deal was found by Cheapflights users on 11/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/107:34 pmSEA - PHL
2 stops11h 01mUnited Airlines
Mon 12/156:30 amPHL - SEA
1 stop8h 15mUnited Airlines
Deal found 11/17$282
This Alaska Airlines deal was found by Cheapflights users on 11/18. 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 12/259:34 amSEA - PHL
Nonstop5h 10mAlaska Airlines
Tue 1/67:00 amPHL - SEA
Nonstop6h 04mAlaska Airlines
Deal found 11/18$287
This American Airlines deal was found by Cheapflights users on 11/18. 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.
Tue 12/2311:07 pmSEA - SBY
1 stop12h 32mAmerican Airlines
Sat 12/277:55 amSBY - SEA
1 stop17h 09mAmerican Airlines
Deal found 11/18$890

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 18, 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 12/25

9:34 am-5:44 pm

Nonstop5h 10m

Philadelphia

Sun 1/11

7:06 pm-10:29 pm

Nonstop6h 23m

$272

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 12/30

12:55 am-10:43 am

1 stop6h 48m

Philadelphia

Mon 1/12

2:31 pm-10:50 pm

1 stop11h 19m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 1/13

7:00 am-5:34 pm

1 stop7h 34m

Philadelphia

Sat 1/17

10:30 am-6:26 pm

2 stops10h 56m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 1/13

6:05 am-5:57 pm

1 stop8h 52m

Philadelphia

Sat 1/17

5:17 pm-9:49 pm

1 stop7h 32m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 12/7

5:25 am-5:40 pm

1 stop9h 15m

Philadelphia

Sat 12/13

7:06 am-2:35 pm

1 stop10h 29m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 1/10

11:55 am-12:21 am

1 stop9h 26m

Philadelphia

Sat 1/17

5:17 pm-9:49 pm

1 stop7h 32m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 12/26

7:30 pm-5:50 am

1 stop7h 20m

Philadelphia

Sun 1/11

11:27 am-4:45 pm

1 stop8h 18m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 12/11

11:59 pm-10:51 am

1 stop7h 52m

Philadelphia

Tue 12/16

11:46 am-5:00 pm

1 stop8h 14m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 12/24

9:29 pm-5:37 am

Nonstop5h 08m

Philadelphia

Tue 1/6

7:00 am-10:04 am

Nonstop6h 04m

$312

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 2/5

6:35 am-4:30 pm

1 stop6h 55m

Philadelphia

Sun 2/8

12:15 pm-10:35 pm

2 stops13h 20m

$322

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/18

Showing 1-10 of 28 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 10m. The time it takes to get you to your destination can typically vary by up to 1h 38m. 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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