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Delaware

$81+ 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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
Apr 18 — Apr 251
Sat 4/18
Sat 4/25
1 adult, Economy
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Cheap 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 March 19, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/14. 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.
Fri 4/174:20 pm
SEA
-
PHL
1 stop10h 14m
Frontier
Mon 4/2010:39 am
PHL
-
SEA
2 stops25h 48m
Frontier
Deal found 3/14$277
This Kiwi.com deal was found by Cheapflights users on 3/17. 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.
Tue 4/147:12 pm
SEA
-
PHL
2 stops26h 42m
Frontier
Fri 5/158:35 pm
PHL
-
SEA
1 stop16h 14m
Frontier
Deal found 3/17$278
This Expedia deal was found by Cheapflights users on 3/14. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/187:12 pm
SEA
-
PHL
1 stop7h 23m
Multiple Airlines
Sat 4/256:58 pm
PHL
-
SEA
Nonstop6h 04m
Multiple Airlines
Deal found 3/14$279
This Kiwi.com deal was found by Cheapflights users on 3/17. 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.
Thu 5/77:50 pm
SEA
-
PHL
1 stop30h 47m
Frontier
Mon 5/118:35 pm
PHL
-
SEA
1 stop16h 14m
Frontier
Deal found 3/17$280
This CheapOair deal was found by Cheapflights users on 3/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/158:07 pm
SEA
-
PHL
1 stop30h 27m
Frontier
Sun 4/198:36 pm
PHL
-
SEA
1 stop15h 51m
Frontier
Deal found 3/17$281
This CheapOair deal was found by Cheapflights users on 3/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/235:31 pm
PDX
-
PHL
1 stop12h 39m
Frontier
Sat 5/307:50 pm
PHL
-
PDX
1 stop19h 00m
Frontier
Deal found 3/15$281
This Kiwi.com deal was found by Cheapflights users on 3/17. 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.
Wed 4/158:07 pm
SEA
-
PHL
2 stops24h 22m
Frontier
Sun 5/108:35 pm
PHL
-
SEA
1 stop16h 14m
Frontier
Deal found 3/17$282
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
Tue 4/2812:38 pm
PDX
-
PHL
1 stop13h 56m
Frontier
Sat 5/24:42 pm
PHL
-
PDX
2 stops20h 38m
Frontier
Deal found 3/18$282
This Kiwi.com deal was found by Cheapflights users on 3/16. 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.
Sun 4/127:46 pm
PDX
-
PHL
2 stops21h 07m
Multiple Airlines
Tue 4/148:41 pm
PHL
-
PDX
1 stop17h 57m
Multiple Airlines
Deal found 3/16$283
This Expedia deal was found by Cheapflights users on 3/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/139:55 pm
SEA
-
PHL
Nonstop5h 10m
Multiple Airlines
Mon 4/208:41 pm
PHL
-
SEA
1 stop15h 46m
Multiple Airlines
Deal found 3/16$284
This Orbitz deal was found by Cheapflights users on 3/16. 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.
Sun 4/2611:15 am
PDX
-
PHL
1 stop15h 19m
Multiple Airlines
Tue 5/57:22 am
PHL
-
PDX
1 stop8h 30m
Multiple Airlines
Deal found 3/16$284
This Kiwi.com deal was found by Cheapflights users on 3/18. 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 4/234:20 pm
SEA
-
PHL
1 stop10h 14m
Frontier
Fri 5/18:41 pm
PHL
-
SEA
1 stop15h 46m
Frontier
Deal found 3/18$285

Find flight deals from Washington to Delaware

Keep the following information in mind while searching for Washington to Delaware flight deals. Data was last updated March 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$277
(Kiwi.com)

One-way from

$81
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$430
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. 3% potential increase in price ($15 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
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 March 19, 2026.
Use the filters below to find and compare flights from Washington to Delaware that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 4/17

9:55 pm-6:05 am

Nonstop5h 10m

Philadelphia

Tue 4/21

7:25 am-10:30 am

Nonstop6h 05m

$297

PascoPhiladelphia

PSC - PHL

PSCPHL

Pasco Tri Cities

Tue 5/5

5:13 pm-5:59 am

1 stop9h 46m

Philadelphia

Sat 5/9

6:00 pm-10:37 pm

1 stop7h 37m

$317

PortlandPhiladelphia

PDX - PHL

PDXPHL

Portland

Tue 4/14

2:30 pm-12:59 am

1 stop7h 29m

Philadelphia

Sat 4/25

2:55 pm-10:34 pm

2 stops10h 39m

$322

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 5/9

9:20 pm-5:37 am

Nonstop5h 17m

Philadelphia

Tue 5/12

5:18 pm-10:48 pm

1 stop8h 30m

$327
Quickest round-trip

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 6/9

9:50 pm-6:05 am

Nonstop5h 15m

Philadelphia

Sun 8/30

7:05 am-10:04 am

Nonstop5h 59m

$329

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 6/12

7:35 pm-5:43 am

1 stop7h 08m

Philadelphia

Sun 9/27

6:40 pm-12:01 am

1 stop8h 21m

$349

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 6/9

5:00 am-5:00 pm

2 stops9h 00m

Philadelphia

Sun 8/30

6:20 am-1:15 pm

1 stop9h 55m

$354

PortlandPhiladelphia

PDX - PHL

PDXPHL

Portland

Tue 5/19

11:15 am-11:55 pm

2 stops9h 40m

Philadelphia

Wed 5/27

2:00 pm-11:10 pm

2 stops12h 10m

$357

PascoPhiladelphia

PSC - PHL

PSCPHL

Pasco Tri Cities

Wed 4/29

5:13 pm-5:59 am

1 stop9h 46m

Philadelphia

Mon 5/4

5:32 pm-12:01 am

2 stops9h 29m

$358

PascoPhiladelphia

PSC - PHL

PSCPHL

Pasco Tri Cities

Thu 4/30

5:13 pm-5:59 am

1 stop9h 46m

Philadelphia

Tue 5/5

6:05 am-5:09 pm

2 stops14h 04m

$364

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/16

Showing 1-10 of 60 resultsSorted by cheapest first
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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 $297, Alaska Airlines can have you in Delaware from State of Washington in 5h 10m. 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.

  • 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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