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Delaware

$96+ 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 4/14. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
feb. 28 — mar. 71
sáb. 2/28
sáb. 3/7
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 enero 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.
jue. 2/2610:57 pm
SEA
-
PHL
Nonstop5h 05m
American Airlines
mar. 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.
jue. 2/261:16 pm
SEA
-
PHL
1 stop25h 39m
Frontier
dom. 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.
jue. 2/191:16 pm
SEA
-
PHL
1 stop25h 39m
Frontier
mié. 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.
dom. 2/2212:00 pm
SEA
-
PHL
1 stop25h 37m
Frontier
vie. 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.
sáb. 5/26:57 pm
SEA
-
PHL
1 stop7h 37m
Frontier
mié. 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.
lun. 2/239:19 am
SEA
-
PHL
1 stop9h 14m
United Airlines
mié. 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.
vie. 3/612:24 pm
SEA
-
PHL
1 stop14h 07m
Frontier
mié. 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.
vie. 3/612:24 pm
SEA
-
PHL
1 stop14h 07m
Frontier
lun. 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.
vie. 4/176:00 am
SEA
-
PHL
1 stop9h 08m
Delta
mar. 4/215:32 pm
PHL
-
SEA
1 stop7h 17m
Delta
Deal found 1/27$257
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/285:13 pm
PSC
-
PHL
1 stop9h 22m
Delta
mar. 5/56:54 pm
PHL
-
PSC
1 stop7h 45m
Delta
Deal found 1/28$257
This Delta deal was found by Cheapflights users on 1/29. 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.
sáb. 2/285:45 am
GEG
-
PHL
1 stop8h 44m
Delta
sáb. 3/75:31 am
PHL
-
GEG
1 stop9h 04m
Delta
Deal found 1/29$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.
jue. 2/191:16 pm
SEA
-
PHL
1 stop25h 39m
Frontier
mar. 2/244:14 pm
PHL
-
SEA
2 stops42h 59m
Frontier
Deal found 1/28$258

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 enero 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$237
(American Airlines)

One-way from

$96
(Expedia)

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 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. 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 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 enero 29, 2026.
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

lun. 2/23

9:19 am-9:33 pm

1 stop9h 14m

Philadelphia

mié. 3/4

5:00 pm-10:43 pm

1 stop8h 43m

$253

PascoPhiladelphia

PSC - PHL

PSCPHL

Pasco Tri Cities

mar. 4/28

5:13 pm-5:35 am

1 stop9h 22m

Philadelphia

mar. 5/5

6:54 pm-11:39 pm

1 stop7h 45m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mar. 2/24

7:00 am-5:14 pm

1 stop7h 14m

Philadelphia

mar. 3/3

5:00 pm-10:43 pm

1 stop8h 43m

$257

SpokanePhiladelphia

GEG - PHL

GEGPHL

Spokane

sáb. 2/28

5:45 am-5:29 pm

1 stop8h 44m

Philadelphia

sáb. 3/7

5:31 am-11:35 am

1 stop9h 04m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

jue. 2/26

7:00 am-5:14 pm

1 stop7h 14m

Philadelphia

mar. 3/3

5:00 pm-10:43 pm

1 stop8h 43m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mar. 2/24

6:45 am-5:05 pm

1 stop7h 20m

Philadelphia

mar. 3/3

5:00 pm-10:30 pm

1 stop8h 30m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mar. 3/31

9:55 pm-6:05 am

Nonstop5h 10m

Philadelphia

lun. 4/6

7:25 am-10:30 am

Nonstop6h 05m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mar. 3/31

9:55 pm-6:05 am

Nonstop5h 10m

Philadelphia

mar. 4/7

7:25 am-10:30 am

Nonstop6h 05m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mar. 2/24

11:59 pm-10:24 am

1 stop7h 25m

Philadelphia

sáb. 2/28

5:00 pm-10:43 pm

1 stop8h 43m

$282

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mar. 4/21

7:00 am-5:33 pm

1 stop7h 33m

Philadelphia

vie. 4/24

11:36 am-7:00 pm

1 stop10h 24m

$287

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

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 $297, United Airlines can have you in Delaware from State of Washington in 8h 28m. The distance between State of Washington and Delaware is about 2147 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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