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Delaware

$143+ Cheap flights from Washington 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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
nov. 16 — nov. 231
dom. 11/16
dom. 11/23
1 adult, Economy
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Find flight deals from Washington to Delaware

Cheapest flights from Washington to Delaware
Explore the most affordable flight options available from Washington to Delaware. Find the lowest fares from popular airlines and budget airlines, with prices last updated on octubre 17, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/13. 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.
mié. 11/121:37 pmSEA - PHL
1 stop12h 12mMultiple Airlines
mié. 11/196:15 amPHL - SEA
2 stops32h 41mMultiple Airlines
Deal found 10/13$249
This Frontier deal was found by Cheapflights users on 10/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/61:08 pmSEA - PHL
1 stop12h 41mFrontier
lun. 11/176:19 amPHL - SEA
1 stop8h 54mFrontier
Deal found 10/15$251
This Kiwi.com deal was found by Cheapflights users on 10/14. 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.
jue. 11/61:08 pmSEA - PHL
1 stop12h 41mFrontier
lun. 11/106:19 amPHL - SEA
1 stop8h 54mFrontier
Deal found 10/14$253
This Kiwi.com deal was found by Cheapflights users on 10/15. 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.
sáb. 11/19:22 pmSEA - PHL
2 stops36h 30mMultiple Airlines
jue. 11/66:19 amPHL - SEA
1 stop8h 54mMultiple Airlines
Deal found 10/15$256
This Alaska Airlines deal was found by Cheapflights users on 10/15. 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.
mié. 11/129:30 pmSEA - PHL
Nonstop5h 12mAlaska Airlines
dom. 11/167:02 amPHL - SEA
Nonstop6h 11mAlaska Airlines
Deal found 10/15$257
This Priceline deal was found by Cheapflights users on 10/14. 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.
dom. 10/262:31 pmSEA - PHL
1 stop11h 48mFrontier
jue. 10/306:19 amPHL - SEA
1 stop8h 54mFrontier
Deal found 10/14$258
This Orbitz deal was found by Cheapflights users on 10/16. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/129:30 pmSEA - PHL
Nonstop5h 12mMultiple Airlines
lun. 11/176:19 amPHL - SEA
1 stop8h 54mMultiple Airlines
Deal found 10/16$259
This Kiwi.com deal was found by Cheapflights users on 10/16. 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.
lun. 12/153:40 pmSEA - PHL
1 stop10h 51mFrontier
jue. 12/258:36 pmPHL - SEA
1 stop18h 54mFrontier
Deal found 10/16$260
This Kiwi.com deal was found by Cheapflights users on 10/16. 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.
dom. 12/1412:48 pmSEA - PHL
1 stop13h 43mFrontier
lun. 12/228:36 pmPHL - SEA
1 stop18h 54mFrontier
Deal found 10/16$261
This Trip.com deal was found by Cheapflights users on 10/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/142:22 pmSEA - PHL
1 stop11h 27mMultiple Airlines
dom. 11/167:00 amPHL - SEA
1 stop13h 15mMultiple Airlines
Deal found 10/16$263
This Orbitz deal was found by Cheapflights users on 10/16. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/1312:58 pmSEA - PHL
1 stop12h 51mMultiple Airlines
mar. 11/187:12 pmPHL - SEA
Nonstop6h 18mMultiple Airlines
Deal found 10/16$264
This WAYA deal was found by Cheapflights users on 10/15. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/86:15 pmSEA - PHL
1 stop11h 08mMultiple Airlines
vie. 11/146:19 amPHL - SEA
1 stop8h 54mMultiple Airlines
Deal found 10/15$265

Cheap flight deals from Washington to Delaware

Keep the following information in mind while searching for Washington to Delaware flight deals. Data was last updated octubre 17, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$249
(Expedia)

One-way from

$143
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$361
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 Washington to Delaware
Search Deals
One-way flight from Washington to Delaware
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($40 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington 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 octubre 17, 2025.
Use the filters below to find and compare flights from Washington to Delaware that are best for you.

Fly from

Washington

Fly to

Delaware

Route

Depart

Return

Price

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

jue. 12/11

9:35 pm-5:46 am

Nonstop5h 11m

Philadelphia

mar. 12/16

7:06 am-10:20 am

Nonstop6h 14m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

jue. 12/4

7:00 am-5:39 pm

1 stop7h 39m

Philadelphia

mar. 12/9

12:45 pm-7:22 pm

1 stop9h 37m

$272

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mié. 11/5

11:55 pm-10:56 am

1 stop8h 01m

Philadelphia

mié. 11/19

9:37 am-2:45 pm

1 stop8h 08m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

sáb. 11/15

10:53 am-9:21 pm

1 stop7h 28m

Philadelphia

dom. 11/16

6:25 am-1:38 pm

1 stop10h 13m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mar. 11/11

11:10 pm-8:41 am

1 stop6h 31m

Philadelphia

sáb. 11/15

6:00 am-12:43 pm

1 stop9h 43m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mié. 11/12

9:30 pm-5:42 am

Nonstop5h 12m

Philadelphia

lun. 11/17

7:12 pm-10:30 pm

Nonstop6h 18m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

jue. 1/29

1:30 pm-11:26 pm

1 stop6h 56m

Philadelphia

dom. 2/1

6:00 am-10:45 am

1 stop7h 45m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mié. 1/14

10:58 am-9:51 pm

1 stop7h 53m

Philadelphia

mar. 1/20

8:09 am-1:57 pm

1 stop8h 48m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

dom. 12/14

9:35 pm-5:46 am

Nonstop5h 11m

Philadelphia

jue. 12/25

7:00 am-10:04 am

Nonstop6h 04m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

jue. 12/11

5:25 am-5:40 pm

1 stop9h 15m

Philadelphia

mar. 12/16

7:05 am-2:59 pm

1 stop10h 54m

$277

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/15

Showing 1-10 of 60 results
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Best time to book a flight from Washington to Delaware

Have a flexible travel schedule? Discover the best time to fly to Delaware from Washington 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 Washington 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 Washington to Delaware. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from State of Washington to Delaware?

    For as low as $257, Alaska Airlines can have you in Delaware from State of Washington in 5h 11m. The distance between State of Washington and Delaware is about 2370 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from State of Washington to Delaware one-way?

    The cheapest airline one-way is United Airlines, with whom users have recently found tickets for as low as $144. However, be on the lookout for offers from Alaska Airlines and Delta, as they are both options that can get you from State of Washington to Delaware for a low price.

  • Can I find deals for flights from Washington to Delaware that include hotel bookings?

    Yes. In addition to deals on Washington to Delaware flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington to Delaware?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to Delaware.

  • Can I find deals for business class flights from Washington to Delaware?

    Yes. Cheapflights offers flight deals from Washington 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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