$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 8/26. Fares are subject to change and may not be available on all flights or dates of travel.
SEA ā ILG
Aug 7 ā Aug 141
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 8, 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 8, 2026.
This Delta deal was found by Cheapflights users on 7/8. 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 9/29:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Mon 9/77:05 am
PHL
- SEA
Nonstop5h 56m
Delta
Deal found 7/8![Delta logo]()
$329
This American Airlines deal was found by Cheapflights users on 7/5. 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 8/289:58 pm
SEA
- PHL
Nonstop5h 18m
American Airlines
Thu 9/35:45 pm
PHL
- SEA
Nonstop6h 13m
American Airlines
Deal found 7/5![American Airlines logo]()
$330
This Kiwi.com deal was found by Cheapflights users on 7/5. 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 7/167:06 pm
SEA
- PHL
1 stop7h 33m
Frontier
Wed 7/2911:06 am
PHL
- SEA
1 stop26h 33m
Frontier
Deal found 7/5![Frontier logo]()
$331
This Kiwi.com deal was found by Cheapflights users on 7/7. 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 8/287:06 pm
SEA
- PHL
1 stop7h 33m
Multiple Airlines
Thu 9/107:00 am
PHL
- SEA
Nonstop5h 51m
Multiple Airlines
Deal found 7/7![Multiple Airlines logo]()
$332
This CheapOair deal was found by Cheapflights users on 7/8. 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 CheapOair is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 7/317:06 pm
SEA
- PHL
1 stop13h 43m
Frontier
Sun 8/28:37 pm
PHL
- SEA
1 stop15h 40m
Frontier
Deal found 7/8![Frontier logo]()
$333
This Kiwi.com deal was found by Cheapflights users on 7/7. 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 7/187:06 pm
SEA
- PHL
1 stop13h 43m
Frontier
Wed 7/2211:06 am
PHL
- SEA
1 stop26h 33m
Frontier
Deal found 7/7![Frontier logo]()
$334
This Kiwi.com deal was found by Cheapflights users on 7/7. 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 8/267:06 pm
SEA
- PHL
1 stop7h 33m
Multiple Airlines
Sat 9/127:00 am
PHL
- SEA
Nonstop5h 51m
Multiple Airlines
Deal found 7/7![Multiple Airlines logo]()
$335
This Frontier deal was found by Cheapflights users on 7/8. 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.
Sat 8/17:06 pm
SEA
- PHL
1 stop13h 43m
Frontier
Mon 8/108:37 pm
PHL
- SEA
1 stop15h 27m
Frontier
Deal found 7/8![Frontier logo]()
$336
This Kiwi.com deal was found by Cheapflights users on 7/6. 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 stops19h 27m
Frontier
Sun 8/168:37 pm
PHL
- SEA
1 stop15h 27m
Frontier
Deal found 7/6![Frontier logo]()
$337
This Frontier deal was found by Cheapflights users on 7/6. 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 stop13h 43m
Frontier
Sun 8/168:37 pm
PHL
- SEA
1 stop15h 27m
Frontier
Deal found 7/6![Frontier logo]()
$338
This Delta deal was found by Cheapflights users on 7/8. 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 9/179:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Sun 9/206:55 pm
PHL
- SEA
1 stop8h 04m
Delta
Deal found 7/8![Delta logo]()
$339
This Alaska Airlines deal was found by Cheapflights users on 7/6. 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.
Fri 8/78:28 am
SEA
- PHL
Nonstop5h 15m
Alaska Airlines
Fri 8/214:48 pm
PHL
- SEA
1 stop8h 51m
Alaska Airlines
Deal found 7/6![Alaska Airlines logo]()
$340
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 8, 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 8, 2026.
This Delta deal was found by Cheapflights users on 7/8. 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 10/89:31 pm
SEA
- PHL
Nonstop5h 14m
Delta
Sun 10/117:00 am
PHL
- SEA
Nonstop5h 58m
Delta
Deal found 7/8![Delta logo]()
$329
This Alaska Airlines deal was found by Cheapflights users on 7/8. 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.
Sun 8/309:27 pm
SEA
- PHL
Nonstop5h 13m
Alaska Airlines
Thu 9/106:59 pm
PHL
- SEA
Nonstop5h 52m
Alaska Airlines
Deal found 7/8![Alaska Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 7/8. 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.
Sun 9/205:55 am
SEA
- PHL
2 stops11h 15m
Southwest
Wed 9/233:05 pm
PHL
- SEA
2 stops11h 00m
Southwest
Deal found 7/8![Southwest logo]()
$344
This United Airlines deal was found by Cheapflights users on 7/4. 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.
Tue 9/297:00 am
SEA
- PHL
1 stop7h 54m
United Airlines
Wed 9/309:34 am
PHL
- SEA
1 stop9h 32m
United Airlines
Deal found 7/4![United Airlines logo]()
$383
This Delta deal was found by Cheapflights users on 7/4. 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 10/255:45 am
PHL
- SEA
1 stop8h 05m
Delta
Deal found 7/4![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 7/8. 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.
Thu 10/89:15 pm
SEA
- PHL
2 stops10h 35m
Southwest
Sun 10/116:20 am
PHL
- SEA
2 stops10h 25m
Southwest
Deal found 7/8![Southwest logo]()
$359
This Alaska Airlines deal was found by Cheapflights users on 7/4. 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 8/1310:02 pm
SEA
- PHL
Nonstop5h 11m
Alaska Airlines
Sun 8/237:02 am
PHL
- SEA
Nonstop5h 51m
Alaska Airlines
Deal found 7/4![Alaska Airlines logo]()
$363
This American Airlines deal was found by Cheapflights users on 7/5. 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 8/48:20 am
SEA
- SBY
1 stop11h 38m
American Airlines
Mon 8/106:41 am
SBY
- SEA
1 stop19h 15m
American Airlines
Deal found 7/5![American Airlines logo]()
$730
This Southwest deal was found by Cheapflights users on 7/7. 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.
Tue 9/226:40 am
SEA
- PHL
2 stops11h 15m
Southwest
Thu 10/112:20 pm
PHL
- SEA
2 stops15h 15m
Southwest
Deal found 7/7![Southwest logo]()
$389
This Southwest deal was found by Cheapflights users on 7/6. 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 10/99:15 pm
SEA
- PHL
2 stops10h 45m
Southwest
Mon 10/1212:20 pm
PHL
- SEA
2 stops15h 15m
Southwest
Deal found 7/6![Southwest logo]()
$389
This Delta deal was found by Cheapflights users on 7/8. 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 7/289:20 pm
SEA
- PHL
Nonstop5h 09m
Delta
Sun 8/26:55 pm
PHL
- SEA
1 stop8h 04m
Delta
Deal found 7/8![Delta logo]()
$432
This Southwest deal was found by Cheapflights users on 7/4. 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 8/177:00 am
SEA
- PHL
2 stops11h 05m
Southwest
Thu 8/2010:20 am
PHL
- SEA
2 stops10h 15m
Southwest
Deal found 7/4![Southwest logo]()
$437
This American Airlines deal was found by Cheapflights users on 7/5. 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
Wed 9/306:41 am
SBY
- SEA
1 stop19h 16m
American Airlines
Deal found 7/5![American Airlines logo]()
$730
This American Airlines deal was found by Cheapflights users on 7/6. 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.
Sat 8/19:35 pm
SEA
- SBY
1 stop10h 23m
American Airlines
Sat 8/86:41 am
SBY
- SEA
1 stop8h 09m
American Airlines
Deal found 7/6![American Airlines logo]()
$805
This American Airlines deal was found by Cheapflights users on 7/5. 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.
Sat 10/176:00 am
SEA
- SBY
1 stop7h 20m
American Airlines
Sat 10/246:41 am
SBY
- SEA
2 stops12h 02m
American Airlines
Deal found 7/5![American Airlines logo]()
$902
This American Airlines deal was found by Cheapflights users on 7/7. 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 7/237:10 am
SEA
- SBY
1 stop10h 20m
American Airlines
Mon 7/274:33 pm
SBY
- SEA
1 stop9h 27m
American Airlines
Deal found 7/7![American Airlines logo]()
$1,012
This American Airlines deal was found by Cheapflights users on 7/5. 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.
Sat 7/2510:47 am
SEA
- SBY
1 stop8h 16m
American Airlines
Sun 7/264:33 pm
SBY
- SEA
1 stop9h 27m
American Airlines
Deal found 7/5![American Airlines logo]()
$1,022
Last-minute flights from Seattle to DelawareDiscover last-minute flight deals from Seattle to Delaware. Data last updated July 8, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Delaware. Data last updated July 8, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 7/5. 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 7/167:06 pm
SEA
- PHL
1 stop7h 33m
Frontier
Wed 7/2911:06 am
PHL
- SEA
1 stop26h 33m
Frontier
Deal found 7/5![Frontier logo]()
$331
This Kiwi.com deal was found by Cheapflights users on 7/7. 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 7/187:06 pm
SEA
- PHL
1 stop13h 43m
Frontier
Wed 7/2211:06 am
PHL
- SEA
1 stop26h 33m
Frontier
Deal found 7/7![Frontier logo]()
$334
This CheapOair deal was found by Cheapflights users on 7/8. 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 CheapOair is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 7/317:06 pm
SEA
- PHL
1 stop13h 43m
Frontier
Sun 8/28:37 pm
PHL
- SEA
1 stop15h 40m
Frontier
Deal found 7/8![Frontier logo]()
$333
This Frontier deal was found by Cheapflights users on 7/6. 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 stop13h 43m
Frontier
Sun 8/168:37 pm
PHL
- SEA
1 stop15h 27m
Frontier
Deal found 7/6![Frontier logo]()
$338
This Frontier deal was found by Cheapflights users on 7/8. 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.
Sat 8/17:06 pm
SEA
- PHL
1 stop13h 43m
Frontier
Mon 8/108:37 pm
PHL
- SEA
1 stop15h 27m
Frontier
Deal found 7/8![Frontier logo]()
$336
This Kiwi.com deal was found by Cheapflights users on 7/6. 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 stops19h 27m
Frontier
Sun 8/168:37 pm
PHL
- SEA
1 stop15h 27m
Frontier
Deal found 7/6![Frontier logo]()
$337
This Delta deal was found by Cheapflights users on 7/6. 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 8/711:56 am
SEA
- PHL
1 stop10h 23m
Delta
Tue 8/187:05 am
PHL
- SEA
Nonstop5h 56m
Delta
Deal found 7/6![Delta logo]()
$340
This Delta deal was found by Cheapflights users on 7/8. 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 8/246:09 pm
SEA
- PHL
1 stop8h 56m
Delta
Mon 8/317:05 am
PHL
- SEA
Nonstop5h 56m
Delta
Deal found 7/8![Delta logo]()
$339
This Kiwi.com deal was found by Cheapflights users on 7/7. 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 8/267:06 pm
SEA
- PHL
1 stop7h 33m
Multiple Airlines
Sat 9/127:00 am
PHL
- SEA
Nonstop5h 51m
Multiple Airlines
Deal found 7/7![Multiple Airlines logo]()
$335
This Delta deal was found by Cheapflights users on 7/7. 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 8/289:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Wed 9/97:05 am
PHL
- SEA
Nonstop5h 51m
Delta
Deal found 7/7![Delta logo]()
$329
This American Airlines deal was found by Cheapflights users on 7/5. 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 8/289:58 pm
SEA
- PHL
Nonstop5h 18m
American Airlines
Thu 9/35:45 pm
PHL
- SEA
Nonstop6h 13m
American Airlines
Deal found 7/5![American Airlines logo]()
$330
This Kiwi.com deal was found by Cheapflights users on 7/7. 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 8/287:06 pm
SEA
- PHL
1 stop7h 33m
Multiple Airlines
Thu 9/107:00 am
PHL
- SEA
Nonstop5h 51m
Multiple Airlines
Deal found 7/7![Multiple Airlines logo]()
$332
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 8, 2026.
Search for one-way flight options from Seattle to Delaware. Find affordable one-way fares based on user searches. Data last updated July 8, 2026.
This Delta deal was found by Cheapflights users on 7/8. 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 9/19:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Deal found 7/8![Delta logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 7/4. 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 7/4![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 7/8. 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 9/47:06 pm
SEA
- PHL
2 stops18h 31m
Frontier
Deal found 7/8![Frontier logo]()
$167
This United Airlines deal was found by Cheapflights users on 7/6. 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.
Fri 10/27:00 am
SEA
- PHL
1 stop9h 24m
United Airlines
Deal found 7/6![United Airlines logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 7/6. 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 8/257:06 pm
SEA
- PHL
2 stops14h 20m
Frontier
Deal found 7/6![Frontier logo]()
$169
This Super.com deal was found by Cheapflights users on 7/6. 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 7/247:06 pm
SEA
- PHL
1 stop7h 33m
Frontier
Deal found 7/6![Frontier logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 7/6. 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 7/6![Frontier logo]()
$172
This Super.com deal was found by Cheapflights users on 7/7. 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 7/237:06 pm
SEA
- PHL
1 stop7h 33m
Frontier
Deal found 7/7![Frontier logo]()
$173
This United Airlines deal was found by Cheapflights users on 7/6. 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 7/2011:11 pm
SEA
- PHL
1 stop8h 19m
United Airlines
Deal found 7/6![United Airlines logo]()
$174
This Delta deal was found by Cheapflights users on 7/6. 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 10/111:59 pm
SEA
- PHL
1 stop7h 48m
Delta
Deal found 7/6![Delta logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 7/7. 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 8/168:53 pm
SEA
- PHL
2 stops29h 46m
Frontier
Deal found 7/7![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 7/7. 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 8/58:13 pm
SEA
- SBY
2 stops44h 41m
Multiple Airlines
Deal found 7/7![Multiple Airlines logo]()
$249
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 8, 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 | $417 |
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 8, 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 10/8
9:31 pm-5:45 am
Nonstop5h 14m
Philadelphia
Sun 10/11
7:00 am-9:58 am
Nonstop5h 58m
$329
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Sun 8/30
9:27 pm-5:40 am
Nonstop5h 13m
Philadelphia
Thu 9/10
6:59 pm-9:51 pm
Nonstop5h 52m
$329
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 10/22
9:31 pm-5:45 am
Nonstop5h 14m
Philadelphia
Sun 10/25
5:45 am-10:50 am
1 stop8h 05m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Sun 9/20
5:55 am-8:10 pm
2 stops11h 15m
Philadelphia
Wed 9/23
3:05 pm-11:05 pm
2 stops11h 00m
$344
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 10/8
9:15 pm-10:50 am
2 stops10h 35m
Philadelphia
Sun 10/11
6:20 am-1:45 pm
2 stops10h 25m
$359
Quickest round-trip
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 8/13
10:02 pm-6:13 am
Nonstop5h 11m
Philadelphia
Sun 8/23
7:02 am-9:53 am
Nonstop5h 51m
$363
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Tue 9/29
7:00 am-5:54 pm
1 stop7h 54m
Philadelphia
Wed 9/30
9:34 am-4:06 pm
1 stop9h 32m
$383
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Tue 9/22
6:40 am-8:55 pm
2 stops11h 15m
Philadelphia
Thu 10/1
12:20 pm-12:35 am
2 stops15h 15m
$389
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 10/9
9:15 pm-11:00 am
2 stops10h 45m
Philadelphia
Mon 10/12
12:20 pm-12:35 am
2 stops15h 15m
$389
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Tue 7/28
9:20 pm-5:29 am
Nonstop5h 09m
Philadelphia
Sun 8/2
6:55 pm-11:59 pm
1 stop8h 04m
$432
Showing 1-10 of 36 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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