Delaware

$107+ 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 6/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
Apr 22 — Apr 291
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Cheap flight deals from Seattle to Delaware

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

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$210
(Cheapflightsfares)

One-way from

$107
(Cheapflightsfares)

Popular in

December

Cheapest in

March

Average price

$422
Provider with most accurate pricing for Seattle/Tacoma Intl-Philadelphia flight deals.
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Philadelphia flights.
From Seattle/Tacoma Intl to Delaware
One-way flight from Seattle/Tacoma Intl to Delaware
Highest demand for flights based on searches. 4% potential increase in price ($21 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Average for round-trip flights in April 2025

Find 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 April 17, 2025.

This Orbitz deal was found by Cheapflights users on 4/17. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/99:29 pmSEA - PHL
Nonstop5h 15mMultiple Airlines
Sun 5/1112:20 pmPHL - SEA
1 stop15h 24mMultiple Airlines
Deal found 4/17$298
This Booking.com deal was found by Cheapflights users on 4/17. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/211:56 pmSEA - PHL
1 stop12h 33mFrontier
Wed 4/236:45 pmPHL - SEA
1 stop26h 17mFrontier
Deal found 4/17$300
This Mytrip deal was found by Cheapflights users on 4/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/3012:30 pmSEA - PHL
2 stops13h 36mSpirit Airlines
Tue 5/610:08 pmPHL - SEA
1 stop29h 02mSpirit Airlines
Deal found 4/16$304
This Delta deal was found by Cheapflights users on 4/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/46:00 amSEA - PHL
1 stop8h 10mDelta
Wed 6/116:45 pmPHL - SEA
1 stop8h 19mDelta
Deal found 4/17$307
This American Airlines deal was found by Cheapflights users on 4/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/612:12 pmSEA - PHL
Nonstop5h 13mAmerican Airlines
Tue 6/107:10 pmPHL - SEA
Nonstop6h 16mAmerican Airlines
Deal found 4/17$312
This United Airlines deal was found by Cheapflights users on 4/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/297:05 pmSEA - PHL
1 stop7h 30mUnited Airlines
Sat 8/304:12 pmPHL - SEA
1 stop9h 24mUnited Airlines
Deal found 4/17$327
This Southwest deal was found by Cheapflights users on 4/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/1410:55 pmSEA - PHL
1 stop7h 30mSouthwest
Wed 6/184:45 pmPHL - SEA
2 stops10h 45mSouthwest
Deal found 4/17$355
This Alaska Airlines deal was found by Cheapflights users on 4/17. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/179:15 pmSEA - PHL
Nonstop5h 10mAlaska Airlines
Thu 8/286:58 pmPHL - SEA
Nonstop6h 02mAlaska Airlines
Deal found 4/17$395
This Hawaiian Airlines deal was found by Cheapflights users on 4/17. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/219:45 pmSEA - PHL
Nonstop5h 16mHawaiian Airlines
Sun 11/237:25 amPHL - SEA
Nonstop6h 12mHawaiian Airlines
Deal found 4/17$407
This American Airlines deal was found by Cheapflights users on 4/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/319:10 amSEA - SBY
1 stop9h 52mAmerican Airlines
Sat 6/75:29 pmSBY - SEA
1 stop8h 26mAmerican Airlines
Deal found 4/16$643

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 April 17, 2025.
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 5/9

9:29 pm-5:44 am

Nonstop5h 15m

Philadelphia

Sun 5/11

12:20 pm-12:44 am

1 stop15h 24m

$298

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 4/27

6:00 am-9:30 pm

1 stop12h 30m

Philadelphia

Sun 5/4

12:20 pm-12:44 am

1 stop15h 24m

$300

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 4/30

12:30 pm-5:06 am

2 stops13h 36m

Philadelphia

Tue 5/6

10:08 pm-12:10 am

1 stop29h 02m

$304

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 6/4

6:00 am-5:10 pm

1 stop8h 10m

Philadelphia

Wed 6/11

6:45 pm-12:04 am

1 stop8h 19m

$307

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 8/29

7:05 pm-5:35 am

1 stop7h 30m

Philadelphia

Sat 8/30

4:12 pm-10:36 pm

1 stop9h 24m

$327

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 7/9

10:43 pm-6:50 am

Nonstop5h 07m

Philadelphia

Sat 7/19

5:33 pm-10:55 pm

1 stop8h 22m

$340

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 6/14

10:55 pm-9:25 am

1 stop7h 30m

Philadelphia

Wed 6/18

4:45 pm-12:30 am

2 stops10h 45m

$355

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 6/17

9:15 pm-5:25 am

Nonstop5h 10m

Philadelphia

Thu 8/28

6:58 pm-10:00 pm

Nonstop6h 02m

$395

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 6/18

9:15 pm-5:25 am

Nonstop5h 10m

Philadelphia

Wed 8/27

6:58 pm-10:00 pm

Nonstop6h 02m

$436

SeattleSalisbury

SEA - SBY

SEASBY

Seattle/Tacoma Intl

Sat 5/31

9:10 am-10:02 pm

1 stop9h 52m

Salisbury-Ocean City

Sat 6/7

5:29 pm-10:55 pm

1 stop8h 26m

$643

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

Showing 1-10 of 20 results
1
2

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

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 17, 2025.
Read through reviews of airlines operating flights from Seattle to Delaware, such as Alaska Airlines, Southwest and Delta. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Food

7.1

Overall

8.0

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Food

7.1

Overall

8.0

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Food

7.1

Overall

8.0

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
8.0
Very good

Food

7.1

Overall

8.0

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Food

7.1

Overall

8.0

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Food

7.1

Overall

8.0

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

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.

  • What are the cheapest airlines to fly from Seattle to Delaware one-way?

    To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $107. Alaska Airlines flights start at $144 while deals on Frontier start at $150 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.

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