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Delaware

$148+ 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 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
jul. 7 — jul. 141
lun. 7/7
lun. 7/14
1 adult, Economy
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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 julio 2, 2025.

Round-trip from

$309
(CheapOair)

One-way from

$148
(Southwest)

Popular in

December

Cheapest in

March

Average price

$461
From Seattle/Tacoma Intl to Delaware
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One-way flight from Seattle/Tacoma Intl to Delaware
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Highest demand for flights based on searches. 6% potential increase in price ($29 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 July 2025
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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 julio 2, 2025.

This CheapOair deal was found by Cheapflights users on 6/30. 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.
vie. 9/126:12 amSEA - PHL
1 stop15h 45mFrontier
dom. 9/1410:16 amPHL - SEA
2 stops41h 14mFrontier
Deal found 6/30$309
This Delta deal was found by Cheapflights users on 7/1. 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.
mié. 8/65:45 pmSEA - PHL
1 stop9h 05mDelta
dom. 8/105:30 amPHL - SEA
1 stop9h 39mDelta
Deal found 7/1$313
This FlightHub deal was found by Cheapflights users on 6/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/156:25 amSEA - PHL
1 stop19h 44mMultiple Airlines
lun. 7/216:22 pmPHL - SEA
1 stop25h 03mMultiple Airlines
Deal found 6/30$315
This Southwest deal was found by Cheapflights users on 7/1. 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.
jue. 8/149:20 amSEA - PHL
1 stop9h 50mSouthwest
dom. 8/245:30 amPHL - SEA
1 stop8h 25mSouthwest
Deal found 7/1$316
This Hawaiian Airlines deal was found by Cheapflights users on 6/30. 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.
mié. 8/69:15 pmSEA - PHL
Nonstop5h 10mHawaiian Airlines
mié. 8/136:45 amPHL - SEA
Nonstop5h 57mHawaiian Airlines
Deal found 6/30$317
This United Airlines deal was found by Cheapflights users on 6/30. 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.
jue. 8/1412:20 amSEA - PHL
1 stop7h 27mUnited Airlines
sáb. 8/236:30 amPHL - SEA
1 stop10h 03mUnited Airlines
Deal found 6/30$319
This Alaska Airlines deal was found by Cheapflights users on 6/30. 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.
vie. 9/129:45 pmSEA - PHL
Nonstop5h 17mAlaska Airlines
dom. 9/147:22 amPHL - SEA
Nonstop5h 56mAlaska Airlines
Deal found 6/30$327
This Mytrip deal was found by Cheapflights users on 6/30. 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.
lun. 7/285:30 pmSEA - PHL
3 stops26h 51mSpirit Airlines
mar. 8/59:15 pmPHL - SEA
2 stops22h 10mSpirit Airlines
Deal found 6/30$345
This Cheapflightsfares deal was found by Cheapflights users on 6/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/206:24 pmSEA - PHL
1 stop12h 27mSun Country Air
dom. 11/2310:00 amPHL - SEA
1 stop10h 15mSun Country Air
Deal found 6/30$348
This American Airlines deal was found by Cheapflights users on 6/29. 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.
sáb. 10/411:38 pmSEA - SBY
1 stop8h 13mAmerican Airlines
mar. 10/76:03 amSBY - SEA
1 stop8h 27mAmerican Airlines
Deal found 6/29$744
This Alaska Airlines deal was found by Cheapflights users on 7/2. 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.
dom. 7/69:15 pmSEA - SBY
1 stop21h 52mAlaska Airlines
dom. 8/3112:20 pmSBY - SEA
1 stop12h 40mAlaska Airlines
Deal found 7/2$956

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 julio 2, 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

vie. 9/12

6:12 am-12:57 am

1 stop15h 45m

Philadelphia

dom. 9/14

10:16 am-12:30 am

2 stops41h 14m

$309

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

vie. 8/1

5:30 pm-9:23 am

2 stops12h 53m

Philadelphia

sáb. 8/16

6:15 am-6:46 pm

1 stop15h 31m

$312

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mié. 8/6

12:20 am-10:47 am

1 stop7h 27m

Philadelphia

lun. 8/11

6:52 pm-11:59 pm

1 stop8h 07m

$313

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

jue. 8/14

9:20 am-10:10 pm

1 stop9h 50m

Philadelphia

dom. 8/24

5:30 am-10:55 am

1 stop8h 25m

$316

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mié. 8/6

9:15 pm-5:25 am

Nonstop5h 10m

Philadelphia

mié. 8/13

6:45 am-9:42 am

Nonstop5h 57m

$317

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

vie. 8/22

3:55 pm-8:44 am

2 stops13h 49m

Philadelphia

mar. 9/2

6:00 am-10:45 am

1 stop7h 45m

$322

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

vie. 9/12

9:45 pm-6:02 am

Nonstop5h 17m

Philadelphia

dom. 9/14

7:22 am-10:18 am

Nonstop5h 56m

$327

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

lun. 7/28

5:30 pm-11:21 pm

3 stops26h 51m

Philadelphia

mar. 8/5

9:15 pm-4:25 pm

2 stops22h 10m

$345

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

jue. 11/20

6:24 pm-9:51 am

1 stop12h 27m

Philadelphia

dom. 11/23

10:00 am-5:15 pm

1 stop10h 15m

$348

SeattleSalisbury

SEA - SBY

SEASBY

Seattle/Tacoma Intl

sáb. 7/19

9:46 pm-8:51 am

1 stop8h 05m

Salisbury-Ocean City

sáb. 7/26

5:00 am-2:00 pm

2 stops12h 00m

$772

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 19 results
1
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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.

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 julio 2, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta from Seattle to Delaware by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Overall

8.0

Entertainment

7.1

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 😥
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Overall

8.0

Entertainment

7.1

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 😥
Southwest
8.0
Very good
4,272 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Overall

8.0

Entertainment

7.1

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 😥
Delta
8.0
Very good
7,975 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Overall

8.0

Entertainment

7.1

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 😥
Hawaiian Airlines
7.8
Good
2,542 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Overall

8.0

Entertainment

7.1

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 😥
United Airlines
7.4
Good
8,861 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Boarding

8.1

Food

7.1

Overall

8.0

Entertainment

7.1

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 Southwest, which is currently one of the cheapest options available, starting at $148. Delta flights start at $149 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.

See more FAQs

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