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Delaware

$138+ 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 7/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
May 5 — May 121
Mon 5/5
Mon 5/12
1 adult, Economy
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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 April 30, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$302
(CheapOair)

One-way from

$140
(CheapOair)

Popular in

December

Cheapest in

March

Average price

$427
Provider with most accurate pricing for Seattle/Tacoma Intl-Philadelphia flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Philadelphia flights.
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From Washington to Delaware
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One-way flight from Washington to Delaware
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Highest demand for flights based on searches. 4% potential increase in price ($21 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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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 April 30, 2025.

This United Airlines deal was found by Cheapflights users on 4/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/65:15 amSEA - PHL
2 stops9h 25mUnited Airlines
Wed 5/71:10 pmPHL - SEA
1 stop8h 42mUnited Airlines
Deal found 4/28$302
This CheapOair deal was found by Cheapflights users on 4/28. 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.
Wed 5/73:20 pmSEA - PHL
1 stop11h 41mMultiple Airlines
Sun 5/1112:20 pmPHL - SEA
1 stop26h 11mMultiple Airlines
Deal found 4/28$303
This Mytrip deal was found by Cheapflights users on 4/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/33:20 pmSEA - PHL
2 stops36h 10mSpirit Airlines
Tue 6/107:45 amPHL - SEA
2 stops19h 25mSpirit Airlines
Deal found 4/28$307
This Orbitz deal was found by Cheapflights users on 4/29. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/125:35 pmPDX - PHL
1 stop8h 50mMultiple Airlines
Tue 8/196:30 amPHL - PDX
1 stop10h 00mMultiple Airlines
Deal found 4/29$307
This Delta deal was found by Cheapflights users on 4/28. 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.
Thu 7/36:00 amSEA - PHL
1 stop9h 10mDelta
Tue 7/87:10 amPHL - SEA
1 stop8h 33mDelta
Deal found 4/28$308
This CheapOair deal was found by Cheapflights users on 4/27. 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 5/112:21 pmSEA - PHL
1 stop26h 16mFrontier
Sat 5/36:54 pmPHL - SEA
1 stop26h 06mFrontier
Deal found 4/27$311
This American Airlines deal was found by Cheapflights users on 4/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2810:59 pmSEA - PHL
Nonstop5h 08mAmerican Airlines
Sun 6/15:00 amPHL - SEA
1 stop8h 15mAmerican Airlines
Deal found 4/29$312
This Mytrip deal was found by Cheapflights users on 4/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/215:40 pmPDX - PHL
2 stops33h 50mSpirit Airlines
Sun 5/2510:48 amPHL - PDX
1 stop8h 57mSpirit Airlines
Deal found 4/29$312
This Southwest deal was found by Cheapflights users on 4/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/208:15 amPDX - PHL
2 stops10h 35mSouthwest
Tue 8/266:30 amPHL - PDX
2 stops10h 00mSouthwest
Deal found 4/29$325
This Alaska Airlines deal was found by Cheapflights users on 4/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/16:30 pmGEG - PHL
1 stop8h 31mAlaska Airlines
Sat 11/86:35 pmPHL - GEG
1 stop8h 24mAlaska Airlines
Deal found 4/29$328
This Booking.com deal was found by Cheapflights users on 4/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/116:35 amPDX - PHL
1 stop19h 35mFrontier
Sun 6/156:15 amPHL - PDX
1 stop31h 03mFrontier
Deal found 4/29$331
This American Airlines deal was found by Cheapflights users on 4/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/73:10 pmGEG - PHL
1 stop11h 15mAmerican Airlines
Sat 8/165:28 pmPHL - GEG
1 stop8h 27mAmerican Airlines
Deal found 4/29$333

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 April 30, 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

Fri 5/30

3:11 pm-5:38 am

1 stop11h 27m

Philadelphia

Tue 6/10

6:00 am-12:10 am

2 stops21h 10m

$302

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 6/12

3:58 pm-5:44 am

1 stop10h 46m

Philadelphia

Mon 6/16

10:42 am-3:03 pm

1 stop31h 21m

$303

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 7/3

6:00 am-6:10 pm

1 stop9h 10m

Philadelphia

Tue 7/8

7:10 am-12:43 pm

1 stop8h 33m

$308

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 9/23

11:54 pm-11:56 am

1 stop9h 02m

Philadelphia

Thu 10/2

10:10 am-3:42 pm

1 stop8h 32m

$310

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 5/15

8:22 pm-6:52 am

1 stop31h 30m

Philadelphia

Thu 5/22

7:10 am-2:16 pm

1 stop10h 06m

$311

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 5/28

10:59 pm-7:07 am

Nonstop5h 08m

Philadelphia

Sun 6/1

5:00 am-10:15 am

1 stop8h 15m

$312

PortlandPhiladelphia

PDX - PHL

PDXPHL

Portland

Wed 5/21

5:40 pm-6:30 am

2 stops33h 50m

Philadelphia

Sun 5/25

10:48 am-4:45 pm

1 stop8h 57m

$312

PortlandPhiladelphia

PDX - PHL

PDXPHL

Portland

Sun 6/1

5:40 pm-6:01 am

1 stop9h 21m

Philadelphia

Wed 6/18

12:06 pm-5:28 pm

1 stop8h 22m

$327

PortlandPhiladelphia

PDX - PHL

PDXPHL

Portland

Wed 6/11

6:35 am-5:10 am

1 stop19h 35m

Philadelphia

Sun 6/15

6:15 am-10:18 am

1 stop31h 03m

$331

SpokanePhiladelphia

GEG - PHL

GEGPHL

Spokane

Thu 8/7

3:10 pm-5:25 am

1 stop11h 15m

Philadelphia

Sat 8/16

5:28 pm-10:55 pm

1 stop8h 27m

$333

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

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

Rainfall in Delaware by month

Plan your trip to Delaware by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Delaware ranges from 2.9 - 4.3 inches per month. July is typically the wettest month, when rainfall can reach 4.3 in. February is typically the driest time to visit Delaware when rainfall is around 2.9 in.

Temperature in Delaware by month

Plan your trip to Delaware by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Delaware, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 77.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing Delaware

Get insights into the airlines that provide service to Delaware. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Delaware. Reviews last updated April 30, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Washington to Delaware to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
9,961 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,295 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,929 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,405 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Food

7.1

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

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

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $140. However, be on the lookout for offers from Spirit Airlines and United Airlines, 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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Alternative routes for Washington to Delaware

See prices for flight routes from nearby airports that may be better suited for you.
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