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Delaware

$149+ 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 3/26. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
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 February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$300
(Mytrip)

One-way from

$149
(Hawaiian Airlines)

Popular in

December

Cheapest in

March

Average price

$555
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 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. 3% potential increase in price ($18 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 February 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 February 20, 2025.

This Mytrip deal was found by Cheapflights users on 2/20. 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.
Thu 3/67:57 pmSEA - PHL
2 stops30h 47mSpirit Airlines
Mon 3/106:38 pmPHL - SEA
2 stops27h 24mSpirit Airlines
Deal found 2/20$300
This Mytrip deal was found by Cheapflights users on 2/19. 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.
Mon 2/2411:23 amSEA - PHL
1 stop15h 51mMultiple Airlines
Thu 3/276:00 amPHL - SEA
1 stop16h 09mMultiple Airlines
Deal found 2/19$306
This Booking.com deal was found by Cheapflights users on 2/19. 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.
Tue 2/253:48 pmSEA - PHL
1 stop11h 26mFrontier
Fri 2/288:00 amPHL - SEA
1 stop28h 30mFrontier
Deal found 2/19$309
This American Airlines deal was found by Cheapflights users on 2/20. 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 3/2011:14 pmSEA - PHL
Nonstop5h 01mAmerican Airlines
Thu 3/276:48 pmPHL - SEA
Nonstop6h 17mAmerican Airlines
Deal found 2/20$317
This Alaska Airlines deal was found by Cheapflights users on 2/19. 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.
Mon 4/79:54 pmSEA - PHL
Nonstop5h 06mAlaska Airlines
Wed 4/165:46 pmPHL - SEA
Nonstop6h 10mAlaska Airlines
Deal found 2/19$337
This Delta deal was found by Cheapflights users on 2/20. 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.
Sat 4/56:00 amSEA - PHL
1 stop13h 30mDelta
Tue 4/157:05 amPHL - SEA
1 stop8h 25mDelta
Deal found 2/20$355
This Southwest deal was found by Cheapflights users on 2/20. 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.
Tue 5/66:00 amSEA - PHL
1 stop6h 55mSouthwest
Mon 5/122:40 pmPHL - SEA
2 stops11h 05mSouthwest
Deal found 2/20$392
This Cheapflightsfares deal was found by Cheapflights users on 2/20. 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.
Sun 6/2211:59 pmSEA - PHL
1 stop8h 11mSun Country Air
Fri 6/2712:05 pmPHL - SEA
1 stop13h 45mSun Country Air
Deal found 2/20$412
This United Airlines deal was found by Cheapflights users on 2/19. 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.
Wed 4/97:00 amSEA - PHL
1 stop7h 27mUnited Airlines
Tue 4/159:31 amPHL - SEA
1 stop9h 27mUnited Airlines
Deal found 2/19$418
This Hawaiian Airlines deal was found by Cheapflights users on 2/20. 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.
Wed 4/239:37 amSEA - PHL
Nonstop5h 16mHawaiian Airlines
Wed 4/236:53 pmPHL - SEA
Nonstop6h 07mHawaiian Airlines
Deal found 2/20$491
This American Airlines deal was found by Cheapflights users on 2/19. 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 4/510:59 pmSEA - SBY
1 stop9h 33mAmerican Airlines
Sat 4/125:00 amSBY - SEA
1 stop10h 33mAmerican Airlines
Deal found 2/19$644

Find flights from Seattle to Delaware within your budget

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 February 20, 2025.

Fly from

Seattle

Fly to

Delaware

Route

Depart

Return

Price

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 3/6

7:57 pm-5:44 am

2 stops30h 47m

Philadelphia

Mon 3/10

6:38 pm-7:02 pm

2 stops27h 24m

$300

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 4/30

12:30 pm-5:52 am

1 stop14h 22m

Philadelphia

Sat 5/3

7:04 am-9:59 am

Nonstop5h 55m

$314

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 3/20

11:14 pm-7:15 am

Nonstop5h 01m

Philadelphia

Thu 3/27

6:48 pm-10:05 pm

Nonstop6h 17m

$317

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 4/5

4:22 pm-5:31 am

1 stop10h 09m

Philadelphia

Mon 4/14

6:40 am-11:56 am

1 stop8h 16m

$320

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 6/4

6:40 pm-11:10 am

1 stop13h 30m

Philadelphia

Sun 6/8

12:05 pm-10:50 pm

1 stop13h 45m

$329

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 4/7

9:54 pm-6:00 am

Nonstop5h 06m

Philadelphia

Tue 4/15

5:46 pm-8:56 pm

Nonstop6h 10m

$337

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 4/5

6:00 am-10:30 pm

1 stop13h 30m

Philadelphia

Tue 4/15

7:05 am-12:30 pm

1 stop8h 25m

$355

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 5/6

6:00 am-3:55 pm

1 stop6h 55m

Philadelphia

Mon 5/12

2:40 pm-10:45 pm

2 stops11h 05m

$392

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 4/9

7:00 am-5:27 pm

1 stop7h 27m

Philadelphia

Tue 4/15

9:31 am-3:58 pm

1 stop9h 27m

$418

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 4/23

9:37 am-5:53 pm

Nonstop5h 16m

Philadelphia

Wed 4/23

6:53 pm-10:00 pm

Nonstop6h 07m

$491

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

Showing 1-10 of 21 results
1
2
3

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.

Travel insights for flights from Seattle to Delaware

Get recent, data-driven insights about flights from Seattle to Delaware including ideal travel times, pricing trends, and more.

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 February 20, 2025.
Read through reviews of airlines operating flights from Seattle to Delaware, such as Southwest, Alaska Airlines 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.
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Overall

8.1

Comfort

8.1

Crew

8.7

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Overall

8.1

Comfort

8.1

Crew

8.7

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Alaska Airlines
8.0
Very good
9,692 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Overall

8.1

Comfort

8.1

Crew

8.7

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Delta
8.0
Very good
8,220 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Overall

8.1

Comfort

8.1

Crew

8.7

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Hawaiian Airlines
7.9
Good
2,317 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Overall

8.1

Comfort

8.1

Crew

8.7

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

United Airlines
7.4
Good
8,766 reviews
Southwest
8.1
Very good
4,411 reviews

Food

7.1

Overall

8.1

Comfort

8.1

Crew

8.7

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

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 Hawaiian Airlines, which is currently one of the cheapest options available, starting at $149. Spirit Airlines flights start at $150 while deals on Frontier start at $151 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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