$165+ 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 9/24. Fares are subject to change and may not be available on all flights or dates of travel.
SEA ā ILG
Aug 2 ā Aug 91
Round-trip
1 adult, Economy
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Find cheap flights from Seattle to Delaware with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click āFind dealsā2. Select your favorite providers
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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 July 3, 2026.
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 July 3, 2026.
This Alaska Airlines deal was found by Cheapflights users on 6/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Alaska Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 10/229:25 pm
SEA
- PHL
Nonstop5h 15m
Alaska Airlines
Mon 10/267:00 am
PHL
- SEA
Nonstop5h 55m
Alaska Airlines
Deal found 6/29![Alaska Airlines logo]()
$329
This Kiwi.com deal was found by Cheapflights users on 6/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 7/297:06 pm
SEA
- PHL
2 stops14h 16m
Frontier
Tue 8/411:06 am
PHL
- SEA
1 stop26h 58m
Frontier
Deal found 6/29![Frontier logo]()
$330
This Kiwi.com deal was found by Cheapflights users on 6/30. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 7/87:06 pm
SEA
- PHL
1 stop13h 43m
Frontier
Mon 7/138:37 pm
PHL
- SEA
1 stop15h 40m
Frontier
Deal found 6/30![Frontier logo]()
$331
This Kiwi.com deal was found by Cheapflights users on 6/30. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 7/217:06 pm
SEA
- PHL
2 stops14h 16m
Frontier
Sat 7/2512:44 pm
PHL
- SEA
1 stop23h 33m
Frontier
Deal found 6/30![Frontier logo]()
$332
This Kiwi.com deal was found by Cheapflights users on 7/2. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 7/278:53 pm
SEA
- PHL
2 stops22h 35m
Frontier
Mon 8/38:37 pm
PHL
- SEA
1 stop15h 40m
Frontier
Deal found 7/2![Frontier logo]()
$333
This Kiwi.com deal was found by Cheapflights users on 6/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sun 9/67:06 pm
SEA
- PHL
1 stop7h 33m
Multiple Airlines
Sat 9/267:00 am
PHL
- SEA
Nonstop5h 51m
Multiple Airlines
Deal found 6/28![Multiple Airlines logo]()
$334
This Southwest deal was found by Cheapflights users on 6/30. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Southwest is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 9/235:20 am
SEA
- PHL
1 stop9h 40m
Southwest
Sun 9/276:20 am
PHL
- SEA
2 stops10h 20m
Southwest
Deal found 6/30![Southwest logo]()
$335
This Frontier deal was found by Cheapflights users on 6/30. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Frontier is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 7/317:06 pm
SEA
- PHL
1 stop7h 33m
Frontier
Mon 8/108:37 pm
PHL
- SEA
1 stop15h 27m
Frontier
Deal found 6/30![Frontier logo]()
$336
This Kiwi.com deal was found by Cheapflights users on 6/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 7/87:06 pm
SEA
- PHL
1 stop13h 43m
Frontier
Tue 7/284:30 pm
PHL
- SEA
2 stops19h 47m
Frontier
Deal found 6/28![Frontier logo]()
$338
This Delta deal was found by Cheapflights users on 6/30. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 9/109:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Sun 9/133:54 pm
PHL
- SEA
1 stop11h 05m
Delta
Deal found 6/30![Delta logo]()
$339
This American Airlines deal was found by Cheapflights users on 7/2. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure American Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 9/248:20 am
SEA
- SBY
1 stop11h 39m
American Airlines
Tue 9/296:41 am
SBY
- SEA
1 stop19h 16m
American Airlines
Deal found 7/2![American Airlines logo]()
$772
This American Airlines deal was found by Cheapflights users on 7/2. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure American Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 8/278:10 am
SEA
- SBY
1 stop11h 48m
American Airlines
Sun 8/306:41 am
SBY
- SEA
1 stop19h 15m
American Airlines
Deal found 7/2![American Airlines logo]()
$774
Best flights from Seattle to DelawareDiscover 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 July 3, 2026.
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 July 3, 2026.
This Delta deal was found by Cheapflights users on 6/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 10/229:31 pm
SEA
- PHL
Nonstop5h 14m
Delta
Sun 10/257:20 am
PHL
- SEA
1 stop8h 40m
Delta
Deal found 6/29![Delta logo]()
$339
This JetBlue deal was found by Cheapflights users on 6/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure JetBlue is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 9/811:44 pm
SEA
- PHL
1 stop11h 46m
JetBlue
Sun 9/203:25 pm
PHL
- SEA
1 stop10h 13m
JetBlue
Deal found 6/28![JetBlue logo]()
$360
This Southwest deal was found by Cheapflights users on 6/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Southwest is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 9/187:00 am
SEA
- PHL
2 stops11h 05m
Southwest
Sun 9/206:20 am
PHL
- SEA
2 stops10h 20m
Southwest
Deal found 6/28![Southwest logo]()
$383
This Delta deal was found by Cheapflights users on 7/1. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 9/159:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Thu 9/176:55 pm
PHL
- SEA
1 stop8h 04m
Delta
Deal found 7/1![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 6/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 9/236:00 am
SEA
- PHL
1 stop7h 32m
Delta
Sat 10/107:00 am
PHL
- SEA
Nonstop5h 58m
Delta
Deal found 6/29![Delta logo]()
$339
This American Airlines deal was found by Cheapflights users on 7/2. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure American Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 9/248:20 am
SEA
- SBY
1 stop11h 39m
American Airlines
Tue 9/296:41 am
SBY
- SEA
1 stop19h 16m
American Airlines
Deal found 7/2![American Airlines logo]()
$772
This Delta deal was found by Cheapflights users on 6/30. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 10/227:59 pm
SEA
- PHL
1 stop7h 06m
Delta
Mon 10/265:45 am
PHL
- SEA
1 stop8h 05m
Delta
Deal found 6/30![Delta logo]()
$349
This Delta deal was found by Cheapflights users on 6/30. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 7/315:59 pm
SEA
- PHL
1 stop9h 16m
Delta
Thu 8/67:05 am
PHL
- SEA
Nonstop5h 56m
Delta
Deal found 6/30![Delta logo]()
$373
This Delta deal was found by Cheapflights users on 6/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 12/237:35 pm
SEA
- PHL
1 stop7h 06m
Delta
Thu 1/75:30 am
PHL
- SEA
1 stop9h 53m
Delta
Deal found 6/28![Delta logo]()
$379
This Delta deal was found by Cheapflights users on 6/30. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 7/297:15 am
SEA
- PHL
1 stop7h 24m
Delta
Thu 8/67:05 am
PHL
- SEA
Nonstop5h 56m
Delta
Deal found 6/30![Delta logo]()
$383
This American Airlines deal was found by Cheapflights users on 7/2. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure American Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 8/278:10 am
SEA
- SBY
1 stop11h 48m
American Airlines
Sun 8/306:41 am
SBY
- SEA
1 stop19h 15m
American Airlines
Deal found 7/2![American Airlines logo]()
$774
This American Airlines deal was found by Cheapflights users on 6/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure American Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 8/68:10 am
SEA
- SBY
1 stop11h 48m
American Airlines
Fri 8/146:41 am
SBY
- SEA
1 stop19h 15m
American Airlines
Deal found 6/29![American Airlines logo]()
$801
This American Airlines deal was found by Cheapflights users on 6/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure American Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 11/55:48 am
SEA
- SBY
1 stop8h 15m
American Airlines
Mon 11/96:10 am
SBY
- SEA
1 stop9h 43m
American Airlines
Deal found 6/29![American Airlines logo]()
$900
This American Airlines deal was found by Cheapflights users on 6/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure American Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 7/1412:40 pm
SEA
- SBY
1 stop7h 18m
American Airlines
Sat 7/186:00 am
SBY
- SEA
2 stops11h 31m
American Airlines
Deal found 6/29![American Airlines logo]()
$992
This American Airlines deal was found by Cheapflights users on 7/1. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure American Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 7/1612:40 pm
SEA
- SBY
1 stop7h 18m
American Airlines
Mon 7/206:41 am
SBY
- SEA
1 stop7h 59m
American Airlines
Deal found 7/1![American Airlines logo]()
$1,012
This American Airlines deal was found by Cheapflights users on 6/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure American Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 7/177:10 am
SEA
- SBY
1 stop11h 53m
American Airlines
Sat 7/186:00 am
SBY
- SEA
1 stop19h 59m
American Airlines
Deal found 6/29![American Airlines logo]()
$1,067
Last-minute flights from Seattle to DelawareDiscover last-minute flight deals from Seattle to Delaware. Data last updated July 3, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Delaware. Data last updated July 3, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 6/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 7/68:28 am
SEA
- PHL
Nonstop5h 15m
Multiple Airlines
Thu 7/3011:06 am
PHL
- SEA
1 stop26h 33m
Multiple Airlines
Deal found 6/28![Multiple Airlines logo]()
$335
This Kiwi.com deal was found by Cheapflights users on 6/30. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 7/87:06 pm
SEA
- PHL
1 stop13h 43m
Frontier
Mon 7/138:37 pm
PHL
- SEA
1 stop15h 40m
Frontier
Deal found 6/30![Frontier logo]()
$331
This Kiwi.com deal was found by Cheapflights users on 6/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 7/87:06 pm
SEA
- PHL
1 stop13h 43m
Frontier
Tue 7/284:30 pm
PHL
- SEA
2 stops19h 47m
Frontier
Deal found 6/28![Frontier logo]()
$338
This Kiwi.com deal was found by Cheapflights users on 6/30. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 7/217:06 pm
SEA
- PHL
2 stops14h 16m
Frontier
Sat 7/2512:44 pm
PHL
- SEA
1 stop23h 33m
Frontier
Deal found 6/30![Frontier logo]()
$332
This Kiwi.com deal was found by Cheapflights users on 7/2. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 7/247:06 pm
SEA
- PHL
2 stops14h 16m
Frontier
Sun 7/268:37 pm
PHL
- SEA
1 stop15h 40m
Frontier
Deal found 7/2![Frontier logo]()
$340
This Kiwi.com deal was found by Cheapflights users on 7/2. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 7/278:53 pm
SEA
- PHL
2 stops22h 35m
Frontier
Mon 8/38:37 pm
PHL
- SEA
1 stop15h 40m
Frontier
Deal found 7/2![Frontier logo]()
$333
This Kiwi.com deal was found by Cheapflights users on 6/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 7/297:06 pm
SEA
- PHL
2 stops14h 16m
Frontier
Tue 8/411:06 am
PHL
- SEA
1 stop26h 58m
Frontier
Deal found 6/29![Frontier logo]()
$330
This Frontier deal was found by Cheapflights users on 6/30. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Frontier is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 7/317:06 pm
SEA
- PHL
1 stop7h 33m
Frontier
Mon 8/108:37 pm
PHL
- SEA
1 stop15h 27m
Frontier
Deal found 6/30![Frontier logo]()
$336
This Alaska Airlines deal was found by Cheapflights users on 7/1. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Alaska Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/249:27 pm
SEA
- PHL
Nonstop5h 13m
Alaska Airlines
Mon 8/317:02 am
PHL
- SEA
Nonstop5h 51m
Alaska Airlines
Deal found 7/1![Alaska Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 7/1. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/2411:59 pm
SEA
- PHL
1 stop7h 48m
Delta
Fri 8/287:05 am
PHL
- SEA
Nonstop5h 56m
Delta
Deal found 7/1![Delta logo]()
$339
This American Airlines deal was found by Cheapflights users on 7/2. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure American Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 8/278:10 am
SEA
- SBY
1 stop11h 48m
American Airlines
Sun 8/306:41 am
SBY
- SEA
1 stop19h 15m
American Airlines
Deal found 7/2![American Airlines logo]()
$774
This Kiwi.com deal was found by Cheapflights users on 6/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 8/297:06 pm
SEA
- PHL
1 stop7h 33m
Multiple Airlines
Sat 9/126:59 pm
PHL
- SEA
Nonstop5h 52m
Multiple Airlines
Deal found 6/29![Multiple Airlines logo]()
$334
One-way flights from Seattle to DelawareSearch for one-way flight options from Seattle to Delaware. Find affordable one-way fares based on user searches. Data last updated July 3, 2026.
Search for one-way flight options from Seattle to Delaware. Find affordable one-way fares based on user searches. Data last updated July 3, 2026.
This Delta deal was found by Cheapflights users on 7/2. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 9/249:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Deal found 7/2![Delta logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 7/2. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 8/187:06 pm
SEA
- PHL
2 stops14h 20m
Frontier
Deal found 7/2![Frontier logo]()
$167
This United Airlines deal was found by Cheapflights users on 7/2. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 9/248:46 am
SEA
- PHL
1 stop9h 29m
United Airlines
Deal found 7/2![United Airlines logo]()
$168
This Southwest deal was found by Cheapflights users on 6/30. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Southwest is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/3111:05 pm
SEA
- PHL
1 stop9h 30m
Southwest
Deal found 6/30![Southwest logo]()
$169
This Trip.com deal was found by Cheapflights users on 6/30. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Trip.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 7/288:13 pm
SEA
- PHL
2 stops23h 15m
Frontier
Deal found 6/30![Frontier logo]()
$170
This Super.com deal was found by Cheapflights users on 6/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Super.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 7/107:06 pm
SEA
- PHL
1 stop7h 33m
Frontier
Deal found 6/29![Frontier logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 6/30. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 8/48:13 pm
SEA
- PHL
2 stops13h 09m
Frontier
Deal found 6/30![Frontier logo]()
$173
This United Airlines deal was found by Cheapflights users on 6/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 7/1310:29 am
SEA
- PHL
1 stop11h 54m
United Airlines
Deal found 6/29![United Airlines logo]()
$174
This Delta deal was found by Cheapflights users on 7/3. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 11/207:35 pm
SEA
- PHL
1 stop7h 06m
Delta
Deal found 7/3![Delta logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 7/3. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 8/88:13 pm
SEA
- PHL
2 stops13h 09m
Frontier
Deal found 7/3![Frontier logo]()
$176
This Kiwi.com deal was found by Cheapflights users on 7/1. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 8/68:53 pm
SEA
- PHL
2 stops32h 46m
Frontier
Deal found 7/1![Frontier logo]()
$177
This Super.com deal was found by Cheapflights users on 7/2. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Super.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 7/97:06 pm
SEA
- PHL
1 stop7h 33m
Frontier
Deal found 7/2![Frontier logo]()
$178
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 July 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $329 (Delta) |
One-way from | $165 (Delta) |
Popular in | December |
Cheapest in | October |
Average price | $418 |
Cheapflights Fare Finder
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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 July 3, 2026.
Use the filters below to find and compare flights from Seattle to Delaware that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 10/22
9:31 pm-5:45 am
Nonstop5h 14m
Philadelphia
Sun 10/25
7:20 am-1:00 pm
1 stop8h 40m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Tue 9/15
9:30 pm-5:50 am
Nonstop5h 20m
Philadelphia
Thu 9/17
6:55 pm-11:59 pm
1 stop8h 04m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 9/23
6:00 am-4:32 pm
1 stop7h 32m
Philadelphia
Sat 10/10
7:00 am-9:58 am
Nonstop5h 58m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 10/22
7:59 pm-6:05 am
1 stop7h 06m
Philadelphia
Mon 10/26
5:45 am-10:50 am
1 stop8h 05m
$349
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Tue 9/8
11:44 pm-2:30 pm
1 stop11h 46m
Philadelphia
Sun 9/20
3:25 pm-10:38 pm
1 stop10h 13m
$360
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 7/31
5:59 pm-6:15 am
1 stop9h 16m
Philadelphia
Thu 8/6
7:05 am-10:01 am
Nonstop5h 56m
$373
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 12/23
7:35 pm-5:41 am
1 stop7h 06m
Philadelphia
Thu 1/7
5:30 am-12:23 pm
1 stop9h 53m
$379
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 9/18
7:00 am-9:05 pm
2 stops11h 05m
Philadelphia
Sun 9/20
6:20 am-1:40 pm
2 stops10h 20m
$383
Quickest round-trip
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 7/29
7:15 am-5:39 pm
1 stop7h 24m
Philadelphia
Thu 8/6
7:05 am-10:01 am
Nonstop5h 56m
$383
SeattleSalisbury
SEA - SBY
SEASBY
Seattle/Tacoma Intl
Thu 9/24
8:20 am-10:59 pm
1 stop11h 39m
Salisbury-Ocean City
Tue 9/29
6:41 am-10:57 pm
1 stop19h 16m
$772
Showing 1-10 of 27 resultsSorted by cheapest first
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.
SEA-PHL
SEA-SBY
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
SEA-USDE
SEA-PHL
SEA-SBY
No data available for this route at this time. Please check back soon.
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