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Delaware

$139+ 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 4/28. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
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 January 29, 2026.

This American Airlines deal was found by Cheapflights users on 1/26. 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.
Thu 2/2610:57 pm
SEA
-
PHL
Nonstop5h 05m
American Airlines
Tue 3/36:35 pm
PHL
-
SEA
Nonstop6h 22m
American Airlines
Deal found 1/26$237
This CheapOair deal was found by Cheapflights users on 1/27. 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.
Thu 2/261:16 pm
SEA
-
PHL
1 stop25h 39m
Frontier
Sun 3/15:47 pm
PHL
-
SEA
1 stop20h 32m
Frontier
Deal found 1/27$240
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 2/191:16 pm
SEA
-
PHL
1 stop25h 39m
Frontier
Wed 2/2511:40 am
PHL
-
SEA
2 stops27h 21m
Frontier
Deal found 1/28$241
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 2/2212:00 pm
SEA
-
PHL
1 stop25h 37m
Frontier
Fri 2/277:05 pm
PHL
-
SEA
1 stop19h 56m
Frontier
Deal found 1/27$249
This CheapOair deal was found by Cheapflights users on 1/28. 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 5/26:57 pm
SEA
-
PHL
1 stop7h 37m
Frontier
Wed 5/68:25 pm
PHL
-
SEA
1 stop16h 02m
Frontier
Deal found 1/28$252
This United Airlines deal was found by Cheapflights users on 1/26. 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.
Mon 2/239:19 am
SEA
-
PHL
1 stop9h 14m
United Airlines
Wed 3/45:00 pm
PHL
-
SEA
1 stop8h 43m
United Airlines
Deal found 1/26$253
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 3/612:24 pm
SEA
-
PHL
1 stop14h 07m
Frontier
Wed 3/115:05 am
PHL
-
SEA
2 stops18h 58m
Frontier
Deal found 1/27$255
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 3/612:24 pm
SEA
-
PHL
1 stop14h 07m
Frontier
Mon 3/98:33 pm
PHL
-
SEA
2 stops23h 36m
Frontier
Deal found 1/27$256
This Delta deal was found by Cheapflights users on 1/27. 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.
Fri 4/176:00 am
SEA
-
PHL
1 stop9h 08m
Delta
Tue 4/215:32 pm
PHL
-
SEA
1 stop7h 17m
Delta
Deal found 1/27$257
This Kiwi.com deal was found by Cheapflights users on 1/28. 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 2/191:16 pm
SEA
-
PHL
1 stop25h 39m
Frontier
Tue 2/244:14 pm
PHL
-
SEA
2 stops42h 59m
Frontier
Deal found 1/28$258
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 3/612:24 pm
SEA
-
PHL
1 stop14h 07m
Multiple Airlines
Wed 3/115:26 pm
PHL
-
SEA
2 stops29h 54m
Multiple Airlines
Deal found 1/27$263
This American Airlines deal was found by Cheapflights users on 1/27. 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 7/78:20 am
SEA
-
SBY
1 stop11h 40m
American Airlines
Tue 7/144:32 pm
SBY
-
SEA
1 stop9h 27m
American Airlines
Deal found 1/27$717

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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$237
(American Airlines)

One-way from

$139
(United Airlines)

Popular in

December

Cheapest in

October

Average price

$368
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. 3% potential increase in price ($15 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 29, 2026.
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

Mon 2/23

9:19 am-9:33 pm

1 stop9h 14m

Philadelphia

Wed 3/4

5:00 pm-10:43 pm

1 stop8h 43m

$253

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 2/24

7:00 am-5:14 pm

1 stop7h 14m

Philadelphia

Tue 3/3

5:00 pm-10:43 pm

1 stop8h 43m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 2/26

7:00 am-5:14 pm

1 stop7h 14m

Philadelphia

Tue 3/3

5:00 pm-10:43 pm

1 stop8h 43m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 2/24

6:45 am-5:05 pm

1 stop7h 20m

Philadelphia

Tue 3/3

5:00 pm-10:30 pm

1 stop8h 30m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 3/31

9:55 pm-6:05 am

Nonstop5h 10m

Philadelphia

Mon 4/6

7:25 am-10:30 am

Nonstop6h 05m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 3/31

9:55 pm-6:05 am

Nonstop5h 10m

Philadelphia

Tue 4/7

7:25 am-10:30 am

Nonstop6h 05m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 2/24

11:59 pm-10:24 am

1 stop7h 25m

Philadelphia

Sat 2/28

5:00 pm-10:43 pm

1 stop8h 43m

$282

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 4/21

7:00 am-5:33 pm

1 stop7h 33m

Philadelphia

Fri 4/24

11:36 am-7:00 pm

1 stop10h 24m

$287

SeattleSalisbury

SEA - SBY

SEASBY

Seattle/Tacoma Intl

Tue 7/7

8:20 am-11:00 pm

1 stop11h 40m

Salisbury-Ocean City

Tue 7/14

4:32 pm-10:59 pm

1 stop9h 27m

$717

SeattleSalisbury

SEA - SBY

SEASBY

Seattle/Tacoma Intl

Wed 2/11

7:00 am-7:55 pm

1 stop9h 55m

Salisbury-Ocean City

Sun 2/15

1:51 pm-7:14 pm

1 stop8h 23m

$897

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

Showing 1-10 of 20 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 American Airlines fly from Seattle to Delaware in about 9h 14m. The time it takes to get you to your destination can typically vary by up to 2h 26m. 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.

  • What are the cheapest airlines to fly from Seattle to Delaware one-way?

    To fly one-way, consider booking your trip with Qatar Airways, which is currently one of the cheapest options available, starting at $413. Royal Jordanian flights start at $450 while deals on Turkish Airlines start at $577 one-way.

  • 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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