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Delaware

$97+ 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 5/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
Mar 13 — Mar 201
Fri 3/13
Fri 3/20
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 February 11, 2026.

This Booking.com deal was found by Cheapflights users on 2/11. 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 4/212:42 pm
SEA
-
PHL
1 stop13h 49m
Frontier
Sat 4/188:25 pm
PHL
-
SEA
1 stop16h 02m
Frontier
Deal found 2/11$238
This Travelocity deal was found by Cheapflights users on 2/9. 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.
Thu 5/146:57 pm
SEA
-
PHL
1 stop7h 37m
Frontier
Mon 5/188:25 pm
PHL
-
SEA
1 stop16h 02m
Frontier
Deal found 2/9$242
This Orbitz deal was found by Cheapflights users on 2/11. 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.
Fri 5/156:57 pm
SEA
-
PHL
1 stop7h 37m
Frontier
Mon 5/188:25 pm
PHL
-
SEA
1 stop16h 02m
Frontier
Deal found 2/11$245
This Kiwi.com deal was found by Cheapflights users on 2/11. 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 4/1510:42 am
SEA
-
PHL
2 stops21h 20m
Frontier
Mon 4/208:25 pm
PHL
-
SEA
1 stop16h 02m
Frontier
Deal found 2/11$246
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 4/1212:42 pm
SEA
-
PHL
1 stop13h 49m
Frontier
Tue 4/145:05 am
PHL
-
SEA
2 stops31h 22m
Frontier
Deal found 2/9$249
This Mytrip deal was found by Cheapflights users on 2/10. 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.
Thu 3/1212:24 pm
SEA
-
PHL
1 stop14h 07m
Frontier
Thu 3/198:25 pm
PHL
-
SEA
1 stop17h 54m
Frontier
Deal found 2/10$250
This Frontier deal was found by Cheapflights users on 2/11. 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.
Fri 3/1312:24 pm
SEA
-
PHL
1 stop14h 07m
Frontier
Thu 3/198:25 pm
PHL
-
SEA
1 stop17h 54m
Frontier
Deal found 2/11$252
This CheapOair deal was found by Cheapflights users on 2/10. 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 4/912:42 pm
SEA
-
PHL
1 stop13h 49m
Frontier
Sun 4/198:25 pm
PHL
-
SEA
1 stop16h 02m
Frontier
Deal found 2/10$253
This Kiwi.com deal was found by Cheapflights users on 2/11. 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 5/84:20 pm
SEA
-
PHL
1 stop10h 14m
Frontier
Thu 5/144:42 pm
PHL
-
SEA
2 stops19h 45m
Frontier
Deal found 2/11$254
This CheapOair deal was found by Cheapflights users on 2/10. 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.
Sun 4/264:20 pm
SEA
-
PHL
1 stop10h 14m
Frontier
Sat 5/28:25 pm
PHL
-
SEA
1 stop16h 02m
Frontier
Deal found 2/10$256
This Kiwi.com deal was found by Cheapflights users on 2/8. 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 3/37:33 pm
SEA
-
PHL
2 stops11h 51m
Frontier
Thu 3/55:47 pm
PHL
-
SEA
1 stop20h 32m
Frontier
Deal found 2/8$257
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 3/299:35 pm
SEA
-
PHL
2 stops35h 06m
Frontier
Sat 4/48:25 pm
PHL
-
SEA
1 stop18h 12m
Frontier
Deal found 2/9$259

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 February 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$238
(Booking.com)

One-way from

$97
(Kiwi.com)

Popular in

February

Cheapest in

January

Average price

$557
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
High demand for flights, 0% potential price rise
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 February 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 February 11, 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

Fri 5/8

4:20 pm-5:34 am

1 stop10h 14m

Philadelphia

Thu 5/14

4:42 pm-9:27 am

2 stops19h 45m

$254

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 5/22

9:27 pm-5:44 am

Nonstop5h 17m

Philadelphia

Sun 5/24

6:59 am-9:50 am

Nonstop5h 51m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 4/29

7:35 pm-5:35 am

1 stop7h 00m

Philadelphia

Fri 5/8

6:59 am-9:50 am

Nonstop5h 51m

$287

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 5/15

9:27 pm-5:44 am

Nonstop5h 17m

Philadelphia

Sun 5/24

6:10 am-10:25 am

1 stop7h 15m

$287

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 5/28

9:27 pm-5:44 am

Nonstop5h 17m

Philadelphia

Sat 6/6

6:59 am-9:48 am

Nonstop5h 49m

$287

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 5/15

9:27 pm-5:44 am

Nonstop5h 17m

Philadelphia

Sun 5/17

6:59 am-9:50 am

Nonstop5h 51m

$287

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 3/12

5:30 am-5:28 pm

1 stop8h 58m

Philadelphia

Wed 3/25

6:49 pm-12:03 am

1 stop8h 14m

$297

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 3/26

11:59 pm-10:45 am

1 stop7h 46m

Philadelphia

Thu 4/2

6:49 pm-12:03 am

1 stop8h 14m

$297

SeattleSalisbury

SEA - SBY

SEASBY

Seattle/Tacoma Intl

Thu 3/5

5:37 am-8:13 pm

2 stops11h 36m

Salisbury-Ocean City

Thu 3/12

1:51 pm-7:14 pm

1 stop8h 23m

$952

SeattleSalisbury

SEA - SBY

SEASBY

Seattle/Tacoma Intl

Mon 4/13

6:00 am-5:59 pm

1 stop8h 59m

Salisbury-Ocean City

Fri 4/17

6:38 am-9:23 pm

1 stop17h 45m

$1,297

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/11

Showing 1-10 of 22 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 Frontier and Delta 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 4h 57m. 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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Alternative routes for Seattle to Delaware

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