$140+ 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 4/25. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
Apr 22 — Apr 291
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 “Find deals”2. Select your favorite providers
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Seattle to Delaware
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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 March 23, 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 March 23, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/217:12 pm
SEA
- PHL
1 stop31h 22m
Frontier
Wed 4/298:31 pm
PHL
- SEA
1 stop15h 56m
Frontier
Deal found 3/19![Frontier logo]()
$277
This Booking.com deal was found by Cheapflights users on 3/22. 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.
Wed 4/227:12 pm
SEA
- PHL
1 stop7h 22m
Frontier
Sun 4/268:36 pm
PHL
- SEA
1 stop21h 29m
Frontier
Deal found 3/22![Frontier logo]()
$278
This Kiwi.com deal was found by Cheapflights users on 3/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/217:12 pm
SEA
- PHL
2 stops36h 41m
Frontier
Sat 4/258:41 pm
PHL
- SEA
1 stop15h 46m
Frontier
Deal found 3/21![Frontier logo]()
$279
This CheapOair deal was found by Cheapflights users on 3/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2811:21 am
SEA
- PHL
1 stop18h 49m
Frontier
Sat 6/67:50 pm
PHL
- SEA
1 stop25h 45m
Frontier
Deal found 3/20![Frontier logo]()
$281
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/244:20 pm
SEA
- PHL
2 stops26h 54m
Frontier
Mon 4/278:41 pm
PHL
- SEA
1 stop15h 46m
Frontier
Deal found 3/19![Frontier logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/117:50 pm
SEA
- PHL
1 stop30h 47m
Frontier
Fri 5/158:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Deal found 3/19![Frontier logo]()
$284
This Kiwi.com deal was found by Cheapflights users on 3/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/234:20 pm
SEA
- PHL
1 stop10h 14m
Frontier
Fri 5/18:41 pm
PHL
- SEA
1 stop15h 46m
Frontier
Deal found 3/18![Frontier logo]()
$285
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/237:12 pm
SEA
- PHL
2 stops25h 30m
Frontier
Mon 4/278:41 pm
PHL
- SEA
1 stop15h 46m
Frontier
Deal found 3/19![Frontier logo]()
$286
This CheapOair deal was found by Cheapflights users on 3/21. 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.
Fri 4/1012:42 pm
SEA
- PHL
1 stop13h 49m
Frontier
Sun 4/268:36 pm
PHL
- SEA
1 stop21h 29m
Frontier
Deal found 3/21![Frontier logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/187:12 pm
SEA
- PHL
1 stop31h 22m
Frontier
Sun 4/266:15 am
PHL
- SEA
2 stops30h 12m
Frontier
Deal found 3/19![Frontier logo]()
$288
This WAYA deal was found by Cheapflights users on 3/19. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/187:12 pm
SEA
- PHL
1 stop7h 23m
Multiple Airlines
Sat 4/256:58 pm
PHL
- SEA
Nonstop6h 04m
Multiple Airlines
Deal found 3/19![Multiple Airlines logo]()
$289
This Orbitz deal was found by Cheapflights users on 3/18. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:12 pm
SEA
- PHL
1 stop7h 22m
Multiple Airlines
Fri 4/246:58 pm
PHL
- SEA
Nonstop6h 04m
Multiple Airlines
Deal found 3/18![Multiple Airlines logo]()
$290
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 March 23, 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 March 23, 2026.
This Delta deal was found by Cheapflights users on 3/21. 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.
Tue 6/309:31 pm
SEA
- PHL
Nonstop5h 14m
Delta
Sun 7/127:08 am
PHL
- SEA
Nonstop5h 56m
Delta
Deal found 3/21![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 3/20. 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.
Sat 8/2911:05 pm
SEA
- PHL
1 stop9h 05m
Southwest
Sun 9/1311:50 am
PHL
- SEA
1 stop8h 10m
Southwest
Deal found 3/20![Southwest logo]()
$349
This Delta deal was found by Cheapflights users on 3/18. 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.
Thu 9/311:05 pm
SEA
- PHL
1 stop6h 31m
Delta
Tue 9/87:05 am
PHL
- SEA
Nonstop5h 59m
Delta
Deal found 3/18![Delta logo]()
$339
This American Airlines deal was found by Cheapflights users on 3/18. 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.
Wed 4/1512:34 pm
SEA
- SBY
1 stop7h 20m
American Airlines
Wed 4/221:47 pm
SBY
- SEA
1 stop10h 17m
American Airlines
Deal found 3/18![American Airlines logo]()
$743
This Delta deal was found by Cheapflights users on 3/22. 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.
Tue 5/57:35 pm
SEA
- PHL
1 stop7h 24m
Delta
Wed 5/137:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 3/22![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 3/22. 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 5/56:50 am
SEA
- PHL
2 stops11h 15m
Southwest
Wed 5/134:00 pm
PHL
- SEA
2 stops10h 35m
Southwest
Deal found 3/22![Southwest logo]()
$379
This Delta deal was found by Cheapflights users on 3/22. 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.
Tue 5/1212:30 pm
SEA
- PHL
1 stop7h 37m
Delta
Tue 6/27:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 3/22![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 3/21. 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 4/216:50 am
SEA
- PHL
2 stops11h 15m
Southwest
Sat 4/257:45 am
PHL
- SEA
2 stops12h 20m
Southwest
Deal found 3/21![Southwest logo]()
$398
This Delta deal was found by Cheapflights users on 3/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/2911:35 pm
SEA
- PHL
1 stop8h 37m
Delta
Mon 6/17:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 3/19![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 3/19. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/78:20 pm
SEA
- PHL
2 stops11h 55m
Southwest
Mon 8/1710:20 am
PHL
- SEA
2 stops10h 15m
Southwest
Deal found 3/19![Southwest logo]()
$398
This Delta deal was found by Cheapflights users on 3/21. 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.
Thu 5/287:59 pm
SEA
- PHL
1 stop7h 11m
Delta
Mon 6/17:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 3/21![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 3/20. 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.
Thu 7/2311:53 pm
SEA
- PHL
1 stop7h 40m
Delta
Fri 7/316:40 pm
PHL
- SEA
1 stop8h 21m
Delta
Deal found 3/20![Delta logo]()
$349
This Delta deal was found by Cheapflights users on 3/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/199:50 pm
SEA
- PHL
Nonstop5h 15m
Delta
Thu 8/277:05 am
PHL
- SEA
Nonstop5h 59m
Delta
Deal found 3/19![Delta logo]()
$354
This American Airlines deal was found by Cheapflights users on 3/19. 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 4/411:59 pm
SEA
- SBY
2 stops10h 26m
American Airlines
Wed 4/81:47 pm
SBY
- SEA
1 stop10h 17m
American Airlines
Deal found 3/19![American Airlines logo]()
$941
This American Airlines deal was found by Cheapflights users on 3/18. 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 4/25:30 am
SEA
- SBY
2 stops11h 43m
American Airlines
Mon 4/61:51 pm
SBY
- SEA
2 stops12h 18m
American Airlines
Deal found 3/18![American Airlines logo]()
$1,003
Last-minute flights from Seattle to DelawareDiscover last-minute flight deals from Seattle to Delaware. Data last updated March 23, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Delaware. Data last updated March 23, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 3/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/1012:42 pm
SEA
- PHL
1 stop13h 49m
Frontier
Sun 4/268:36 pm
PHL
- SEA
1 stop15h 51m
Frontier
Deal found 3/20![Frontier logo]()
$281
This American Airlines deal was found by Cheapflights users on 3/18. 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.
Wed 4/1512:34 pm
SEA
- SBY
1 stop7h 20m
American Airlines
Wed 4/221:47 pm
SBY
- SEA
1 stop10h 17m
American Airlines
Deal found 3/18![American Airlines logo]()
$743
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/187:12 pm
SEA
- PHL
1 stop31h 22m
Frontier
Sun 4/266:15 am
PHL
- SEA
2 stops30h 12m
Frontier
Deal found 3/19![Frontier logo]()
$288
This WAYA deal was found by Cheapflights users on 3/19. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/187:12 pm
SEA
- PHL
1 stop7h 23m
Multiple Airlines
Sat 4/256:58 pm
PHL
- SEA
Nonstop6h 04m
Multiple Airlines
Deal found 3/19![Multiple Airlines logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/217:12 pm
SEA
- PHL
1 stop31h 22m
Frontier
Wed 4/298:31 pm
PHL
- SEA
1 stop15h 56m
Frontier
Deal found 3/19![Frontier logo]()
$277
This Kiwi.com deal was found by Cheapflights users on 3/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/217:12 pm
SEA
- PHL
2 stops36h 41m
Frontier
Sat 4/258:41 pm
PHL
- SEA
1 stop15h 46m
Frontier
Deal found 3/21![Frontier logo]()
$279
This Booking.com deal was found by Cheapflights users on 3/22. 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.
Wed 4/227:12 pm
SEA
- PHL
1 stop7h 22m
Frontier
Sun 4/268:36 pm
PHL
- SEA
1 stop21h 29m
Frontier
Deal found 3/22![Frontier logo]()
$278
This Orbitz deal was found by Cheapflights users on 3/18. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:12 pm
SEA
- PHL
1 stop7h 22m
Multiple Airlines
Fri 4/246:58 pm
PHL
- SEA
Nonstop6h 04m
Multiple Airlines
Deal found 3/18![Multiple Airlines logo]()
$290
This Kiwi.com deal was found by Cheapflights users on 3/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/234:20 pm
SEA
- PHL
1 stop10h 14m
Frontier
Fri 5/18:41 pm
PHL
- SEA
1 stop15h 46m
Frontier
Deal found 3/18![Frontier logo]()
$285
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/237:12 pm
SEA
- PHL
2 stops25h 30m
Frontier
Mon 4/278:41 pm
PHL
- SEA
1 stop15h 46m
Frontier
Deal found 3/19![Frontier logo]()
$286
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/244:20 pm
SEA
- PHL
2 stops26h 54m
Frontier
Mon 4/278:41 pm
PHL
- SEA
1 stop15h 46m
Frontier
Deal found 3/19![Frontier logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 3/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/257:12 pm
SEA
- PHL
2 stops36h 50m
Frontier
Wed 4/298:31 pm
PHL
- SEA
1 stop15h 56m
Frontier
Deal found 3/22![Frontier logo]()
$293
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 March 23, 2026.
Search for one-way flight options from Seattle to Delaware. Find affordable one-way fares based on user searches. Data last updated March 23, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/257:12 pm
SEA
- PHL
2 stops36h 50m
Frontier
Deal found 3/20![Frontier logo]()
$140
This Kiwi.com deal was found by Cheapflights users on 3/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/57:50 pm
SEA
- PHL
1 stop30h 47m
Frontier
Deal found 3/21![Frontier logo]()
$141
This Kiwi.com deal was found by Cheapflights users on 3/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1811:37 am
SEA
- PHL
2 stops42h 22m
Frontier
Deal found 3/21![Frontier logo]()
$142
This Kiwi.com deal was found by Cheapflights users on 3/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/912:42 pm
SEA
- PHL
2 stops44h 01m
Frontier
Deal found 3/20![Frontier logo]()
$143
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/310:25 pm
SEA
- PHL
2 stops52h 12m
Frontier
Deal found 3/19![Frontier logo]()
$144
This Frontier deal was found by Cheapflights users on 3/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/194:20 pm
SEA
- PHL
1 stop10h 14m
Frontier
Deal found 3/20![Frontier logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 3/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/139:34 pm
SEA
- PHL
2 stops34h 36m
Frontier
Deal found 3/18![Frontier logo]()
$146
This Kiwi.com deal was found by Cheapflights users on 3/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2210:57 am
SEA
- PHL
2 stops15h 16m
Frontier
Deal found 3/21![Frontier logo]()
$147
This eDestinos deal was found by Cheapflights users on 3/20. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/87:50 pm
SEA
- PHL
2 stops22h 38m
Frontier
Deal found 3/20![Frontier logo]()
$150
This Frontier deal was found by Cheapflights users on 3/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/87:50 pm
SEA
- PHL
1 stop12h 57m
Frontier
Deal found 3/20![Frontier logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 3/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/207:50 pm
SEA
- PHL
2 stops40h 26m
Frontier
Deal found 3/20![Frontier logo]()
$152
This American Airlines deal was found by Cheapflights users on 3/21. 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.
Fri 4/1012:34 pm
SEA
- SBY
1 stop7h 20m
American Airlines
Deal found 3/21![American Airlines logo]()
$699
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 March 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $277 (Kiwi.com) |
One-way from | $140 (Kiwi.com) |
Popular in | December |
Cheapest in | October |
Average price | $430 |
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 March 23, 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
Quickest round-trip
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Tue 6/30
9:31 pm-5:45 am
Nonstop5h 14m
Philadelphia
Sun 7/12
7:08 am-10:04 am
Nonstop5h 56m
$329
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 9/3
11:05 pm-8:36 am
1 stop6h 31m
Philadelphia
Tue 9/8
7:05 am-10:04 am
Nonstop5h 59m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Tue 5/5
7:35 pm-5:59 am
1 stop7h 24m
Philadelphia
Wed 5/13
7:10 am-10:00 am
Nonstop5h 50m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Tue 5/12
12:30 pm-11:07 pm
1 stop7h 37m
Philadelphia
Tue 6/2
7:10 am-10:00 am
Nonstop5h 50m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 5/29
11:35 pm-11:12 am
1 stop8h 37m
Philadelphia
Mon 6/1
7:10 am-10:00 am
Nonstop5h 50m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 5/28
7:59 pm-6:10 am
1 stop7h 11m
Philadelphia
Mon 6/1
7:10 am-10:00 am
Nonstop5h 50m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Sat 8/29
11:05 pm-11:10 am
1 stop9h 05m
Philadelphia
Sun 9/13
11:50 am-5:00 pm
1 stop8h 10m
$349
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 7/23
11:53 pm-10:33 am
1 stop7h 40m
Philadelphia
Fri 7/31
6:40 pm-12:01 am
1 stop8h 21m
$349
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 8/19
9:50 pm-6:05 am
Nonstop5h 15m
Philadelphia
Thu 8/27
7:05 am-10:04 am
Nonstop5h 59m
$354
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Tue 5/5
6:50 am-9:05 pm
2 stops11h 15m
Philadelphia
Wed 5/13
4:00 pm-11:35 pm
2 stops10h 35m
$379
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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