How long is the flight from Seattle to Delaware?

Airlines like United Airlines and Delta fly from Seattle to Delaware in about 9h 28m. The time it takes to get you to your destination can typically vary by up to 06m. Seattle and Delaware are separated by a distance of 2370 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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.

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).

What is the cheapest time of day to fly from SEA to DE?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Delaware as you normally would.

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.

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.

$122+ Flights from Seattle to Delaware

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Cheap 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 December 31, 2025.

Wed 12/3110:13 pmSEA - PHL

1 stop11h 28mAmerican Airlines

Thu 1/13:55 pmPHL - SEA

1 stop10h 18mAmerican Airlines

Deal found 12/30

$580

Wed 12/312:46 pmSEA - PHL

1 stop11h 54mFrontier

Wed 1/78:00 amPHL - SEA

2 stops30h 21mFrontier

Deal found 12/30

$670

Tue 12/306:34 pmSEA - PHL

1 stop12h 44mMultiple Airlines

Sat 1/106:11 pmPHL - SEA

2 stops44h 36mMultiple Airlines

Deal found 12/29

$689

Tue 12/306:34 pmSEA - PHL

1 stop12h 44mMultiple Airlines

Tue 1/68:54 pmPHL - SEA

2 stops39h 10mMultiple Airlines

Deal found 12/29

$734

Wed 12/316:20 pmSEA - PHL

1 stop14h 01mMultiple Airlines

Wed 1/77:06 pmPHL - SEA

Nonstop6h 23mMultiple Airlines

Deal found 12/30

$745

Wed 12/319:29 pmSEA - PHL

Nonstop5h 08mAlaska Airlines

Thu 1/18:21 amPHL - SEA

1 stop27h 47mAlaska Airlines

Deal found 12/30

$817

Wed 12/315:23 amSEA - PHL

1 stop11h 10mAmerican Airlines

Wed 1/712:08 pmPHL - SEA

1 stop12h 39mAmerican Airlines

Deal found 12/30

$837

Wed 12/316:20 pmSEA - PHL

1 stop14h 01mMultiple Airlines

Sat 1/37:00 amPHL - SEA

Nonstop6h 04mMultiple Airlines

Deal found 12/31

$850

Tue 12/3012:10 pmSEA - PHL

1 stop8h 25mSouthwest

Sat 1/102:05 pmPHL - SEA

1 stop10h 00mSouthwest

Deal found 12/29

$856

Best flights from Seattle to Delaware
Discover carefully curated flight deals from Seattle to Delaware that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 31, 2025.

Thu 1/225:00 amSEA - PHL

2 stops9h 34mUnited Airlines

Mon 1/263:01 pmPHL - SEA

2 stops10h 42mUnited Airlines

Deal found 12/30

$267

Fri 2/2711:15 pmSEA - PHL

1 stop9h 28mDelta

Wed 3/46:50 pmPHL - SEA

1 stop8h 19mDelta

Deal found 12/28

$277

Thu 1/225:00 amSEA - PHL

2 stops9h 34mUnited Airlines

Tue 1/276:30 amPHL - SEA

2 stops10h 27mUnited Airlines

Deal found 12/30

$267

Fri 1/3011:10 pmSEA - PHL

1 stop9h 28mDelta

Mon 2/22:30 pmPHL - SEA

1 stop11h 45mDelta

Deal found 12/29

$277

Sat 2/76:05 amSEA - PHL

1 stop7h 29mDelta

Sat 2/147:00 amPHL - SEA

1 stop8h 25mDelta

Deal found 12/28

$277

Sat 2/286:00 amSEA - PHL

1 stop7h 37mDelta

Tue 3/106:49 pmPHL - SEA

1 stop8h 12mDelta

Deal found 12/28

$277

Wed 3/46:00 amSEA - PHL

1 stop7h 32mDelta

Tue 3/107:00 amPHL - SEA

1 stop10h 52mDelta

Deal found 12/28

$277

Thu 2/261:38 pmSEA - PHL

1 stop7h 08mDelta

Mon 3/26:50 pmPHL - SEA

1 stop8h 19mDelta

Deal found 12/29

$277

Wed 1/147:00 amSEA - SBY

1 stop9h 55mAmerican Airlines

Sun 1/182:17 pmSBY - SEA

1 stop9h 28mAmerican Airlines

Deal found 12/30

$877

Wed 2/256:00 amSEA - PHL

1 stop7h 32mDelta

Tue 3/32:31 pmPHL - SEA

1 stop11h 41mDelta

Deal found 12/29

$277

Wed 2/251:38 pmSEA - PHL

1 stop7h 08mDelta

Sun 3/16:50 pmPHL - SEA

1 stop8h 19mDelta

Deal found 12/28

$277

Last-minute flights from Seattle to Delaware
Discover last-minute flight deals from Seattle to Delaware. Data last updated December 31, 2025 and is based on user searches.

Thu 1/86:12 amSEA - PHL

Nonstop5h 05mAmerican Airlines

Wed 1/147:17 amPHL - SEA

1 stop8h 51mAmerican Airlines

Deal found 12/30

$300

Thu 1/86:15 amSEA - PHL

1 stop8h 27mDelta

Wed 1/146:00 amPHL - SEA

1 stop7h 42mDelta

Deal found 12/30

$337

Tue 1/136:12 amSEA - PHL

Nonstop5h 05mAmerican Airlines

Sat 1/1712:28 pmPHL - SEA

1 stop12h 22mAmerican Airlines

Deal found 12/30

$265

Sat 1/176:05 amSEA - PHL

1 stop7h 23mDelta

Wed 1/2112:16 pmPHL - SEA

1 stop9h 44mDelta

Deal found 12/30

$317

Mon 1/196:12 amSEA - PHL

Nonstop5h 05mAmerican Airlines

Thu 1/226:50 pmPHL - SEA

Nonstop6h 17mAmerican Airlines

Deal found 12/29

$277

Tue 1/206:12 amSEA - PHL

Nonstop5h 05mAmerican Airlines

Wed 1/283:35 pmPHL - SEA

1 stop9h 12mAmerican Airlines

Deal found 12/30

$296

Thu 1/225:00 amSEA - PHL

2 stops9h 34mUnited Airlines

Mon 1/263:01 pmPHL - SEA

2 stops10h 42mUnited Airlines

Deal found 12/30

$267

Thu 1/227:00 amSEA - PHL

1 stop9h 38mAmerican Airlines

Tue 1/276:50 pmPHL - SEA

Nonstop6h 17mAmerican Airlines

Deal found 12/30

$288

Thu 1/2211:25 amSEA - PHL

1 stop9h 26mAmerican Airlines

Mon 1/266:50 pmPHL - SEA

Nonstop6h 17mAmerican Airlines

Deal found 12/30

$297

Fri 1/238:40 amSEA - PHL

2 stops9h 56mUnited Airlines

Mon 1/263:01 pmPHL - SEA

2 stops10h 42mUnited Airlines

Deal found 12/30

$308

Fri 1/308:30 amSEA - PHL

1 stop8h 29mMultiple Airlines

Mon 2/27:06 pmPHL - SEA

Nonstop6h 23mMultiple Airlines

Deal found 12/30

$281

Fri 1/3011:25 amSEA - PHL

1 stop9h 26mAmerican Airlines

Mon 2/26:50 pmPHL - SEA

Nonstop6h 17mAmerican Airlines

Deal found 12/30

$291

One-way flights from Seattle to Delaware
Search for one-way flight options from Seattle to Delaware. Find affordable one-way fares based on user searches. Data last updated December 31, 2025.

Sun 2/112:34 pmSEA - PHL

3 stops43h 45mMultiple Airlines

Deal found 12/30

$122

Wed 1/77:00 amSEA - PHL

1 stop7h 33mUnited Airlines

Deal found 12/31

$123

Tue 3/37:33 pmSEA - PHL

3 stops21h 18mMultiple Airlines

Deal found 12/30

$127

Wed 1/2810:58 amSEA - PHL

1 stop7h 38mUnited Airlines

Deal found 12/28

$129

Thu 1/299:25 pmSEA - PHL

3 stops32h 22mMultiple Airlines

Deal found 12/28

$130

Mon 2/212:34 pmSEA - PHL

3 stops24h 07mMultiple Airlines

Deal found 12/30

$133

Sat 3/78:59 amSEA - PHL

2 stops12h 17mUnited Airlines

Deal found 12/30

$134

Mon 3/29:14 pmSEA - PHL

3 stops32h 30mMultiple Airlines

Deal found 12/30

$135

Thu 1/2212:34 pmSEA - PHL

2 stops43h 44mFrontier

Deal found 12/28

$136

Sat 3/289:55 pmSEA - PHL

Nonstop5h 10mAlaska Airlines

Deal found 12/31

$138

Find flight deals from Seattle to Delaware

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$265 (American Airlines)
One-way from	$122 (Kiwi.com)
Popular in	December
Cheapest in	October
Average price	$646

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 Seattle/Tacoma Intl to Delaware

Search Deals

One-way flight from Seattle/Tacoma Intl to Delaware

Search Deals

Highest demand for flights based on searches. 8% potential increase in price ($38 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($20 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 1/22

5:00 am-5:34 pm

2 stops9h 34m

Philadelphia

Mon 1/26

3:01 pm-10:43 pm

2 stops10h 42m

$267

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 1/22

5:00 am-5:34 pm

2 stops9h 34m

Philadelphia

Tue 1/27

6:30 am-1:57 pm

2 stops10h 27m

$267

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 2/27

11:15 pm-11:43 am

1 stop9h 28m

Philadelphia

Wed 3/4

6:50 pm-12:09 am

1 stop8h 19m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 1/30

11:10 pm-11:38 am

1 stop9h 28m

Philadelphia

Mon 2/2

2:30 pm-11:15 pm

1 stop11h 45m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 2/7

6:05 am-4:34 pm

1 stop7h 29m

Philadelphia

Sat 2/14

7:00 am-12:25 pm

1 stop8h 25m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 2/28

6:00 am-4:37 pm

1 stop7h 37m

Philadelphia

Tue 3/10

6:49 pm-12:01 am

1 stop8h 12m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 3/4

6:00 am-4:32 pm

1 stop7h 32m

Philadelphia

Tue 3/10

7:00 am-2:52 pm

1 stop10h 52m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 2/26

1:38 pm-11:46 pm

1 stop7h 08m

Philadelphia

Mon 3/2

6:50 pm-12:09 am

1 stop8h 19m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 2/25

6:00 am-4:32 pm

1 stop7h 32m

Philadelphia

Tue 3/3

2:31 pm-11:12 pm

1 stop11h 41m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 2/25

1:38 pm-11:46 pm

1 stop7h 08m

Philadelphia

Sun 3/1

6:50 pm-12:09 am

1 stop8h 19m

$277

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/30

Showing 1-10 of 20 results

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

No data available for this route at this time. Please check back soon.

Related info for your journey

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.
How long is the flight from Seattle to Delaware?
Airlines like United Airlines and Delta fly from Seattle to Delaware in about 9h 28m. The time it takes to get you to your destination can typically vary by up to 06m. Seattle and Delaware are separated by a distance of 2370 mi. Both multi-stop and nonstop flights can be found to your destination and back.
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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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$122+ 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 2/1. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Seattle to Delaware with Cheapflights

1. Tell us where you want to go

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3. Compare prices and book

Cheap flight deals from Seattle to Delaware

Cheapest flights from Seattle to DelawareExplore 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 December 31, 2025.

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 December 31, 2025.

Find flight deals from Seattle to Delaware

Keep the following information in mind while searching for Seattle to Delaware flight deals. Data was last updated December 31, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to Delaware that are best for you.

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.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Delaware

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?

How long is the flight from Seattle to Delaware?

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

How can I find direct flights from Seattle to Delaware?

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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Seattle to Delaware

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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 December 31, 2025.