$66+ 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 4/13. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
Mar 29 — Apr 51
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 February 27, 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 February 27, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/23. 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 4/287:12 pm
SEA
- PHL
2 stops26h 42m
Frontier
Thu 5/78:25 pm
PHL
- SEA
1 stop16h 02m
Frontier
Deal found 2/23![Frontier logo]()
$251
This CheapOair deal was found by Cheapflights users on 2/26. 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 4/234:20 pm
SEA
- PHL
1 stop10h 14m
Frontier
Sun 4/268:36 pm
PHL
- SEA
1 stop21h 29m
Frontier
Deal found 2/26![Frontier logo]()
$253
This Kiwi.com deal was found by Cheapflights users on 2/23. 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 3/316:24 pm
SEA
- PHL
2 stops32h 07m
Frontier
Sun 4/58:25 pm
PHL
- SEA
1 stop18h 12m
Frontier
Deal found 2/23![Frontier logo]()
$255
This CheapOair deal was found by Cheapflights users on 2/23. 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.
Sun 4/1212:42 pm
SEA
- PHL
1 stop13h 49m
Frontier
Tue 4/148:41 pm
PHL
- SEA
1 stop15h 46m
Frontier
Deal found 2/23![Frontier logo]()
$256
This Kiwi.com deal was found by Cheapflights users on 2/23. 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 3/316:24 pm
SEA
- PHL
2 stops32h 07m
Frontier
Tue 4/148:41 pm
PHL
- SEA
1 stop15h 46m
Frontier
Deal found 2/23![Frontier logo]()
$257
This Expedia deal was found by Cheapflights users on 2/24. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/17:12 pm
SEA
- PHL
1 stop7h 22m
Multiple Airlines
Mon 5/46:58 pm
PHL
- SEA
Nonstop6h 04m
Multiple Airlines
Deal found 2/24![Multiple Airlines logo]()
$259
This Expedia deal was found by Cheapflights users on 2/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/199:55 pm
SEA
- PHL
Nonstop5h 10m
Multiple Airlines
Thu 4/238:41 pm
PHL
- SEA
1 stop21h 24m
Multiple Airlines
Deal found 2/26![Multiple Airlines logo]()
$260
This CheapOair deal was found by Cheapflights users on 2/23. 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.
Mon 3/1612:24 pm
SEA
- PHL
1 stop14h 07m
Frontier
Thu 3/198:25 pm
PHL
- SEA
1 stop17h 54m
Frontier
Deal found 2/23![Frontier logo]()
$261
This Kiwi.com deal was found by Cheapflights users on 2/23. 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 4/287:12 pm
SEA
- PHL
1 stop31h 22m
Frontier
Wed 5/68:25 pm
PHL
- SEA
1 stop16h 02m
Frontier
Deal found 2/23![Frontier logo]()
$263
This Expedia deal was found by Cheapflights users on 2/24. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/79:44 pm
SEA
- PHL
Nonstop5h 18m
Multiple Airlines
Sun 5/108:25 pm
PHL
- SEA
1 stop16h 02m
Multiple Airlines
Deal found 2/24![Multiple Airlines logo]()
$264
This Kiwi.com deal was found by Cheapflights users on 2/24. 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 3/239:55 pm
SEA
- PHL
Nonstop5h 10m
Hawaiian Airlines
Tue 3/316:47 pm
PHL
- SEA
Nonstop6h 05m
Hawaiian Airlines
Deal found 2/24![Hawaiian Airlines logo]()
$266
This American Airlines deal was found by Cheapflights users on 2/23. 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 3/1310:57 pm
SEA
- SBY
1 stop12h 16m
American Airlines
Wed 3/187:43 am
SBY
- SEA
1 stop17h 14m
American Airlines
Deal found 2/23![American Airlines logo]()
$789
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 February 27, 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 February 27, 2026.
This Southwest deal was found by Cheapflights users on 2/23. 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 5/59:20 am
SEA
- PHL
2 stops9h 40m
Southwest
Wed 5/135:45 pm
PHL
- SEA
1 stop9h 25m
Southwest
Deal found 2/23![Southwest logo]()
$277
This Delta deal was found by Cheapflights users on 2/25. 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 5/2811:05 pm
SEA
- PHL
1 stop6h 50m
Delta
Sat 6/67:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 2/25![Delta logo]()
$287
This Alaska Airlines deal was found by Cheapflights users on 2/24. 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.
Thu 3/269:55 pm
SEA
- PHL
Nonstop5h 10m
Alaska Airlines
Thu 4/27:25 am
PHL
- SEA
Nonstop6h 05m
Alaska Airlines
Deal found 2/24![Alaska Airlines logo]()
$362
This Delta deal was found by Cheapflights users on 2/25. 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 3/264:55 pm
SEA
- PHL
1 stop9h 46m
Delta
Thu 4/26:54 pm
PHL
- SEA
1 stop7h 46m
Delta
Deal found 2/25![Delta logo]()
$297
This Southwest deal was found by Cheapflights users on 2/23. 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.
Mon 5/49:00 pm
SEA
- PHL
2 stops10h 50m
Southwest
Sat 5/912:25 pm
PHL
- SEA
2 stops12h 35m
Southwest
Deal found 2/23![Southwest logo]()
$331
This Delta deal was found by Cheapflights users on 2/24. 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 6/29:20 pm
SEA
- PHL
Nonstop5h 15m
Delta
Sun 6/77:05 am
PHL
- SEA
Nonstop5h 59m
Delta
Deal found 2/24![Delta logo]()
$312
This Southwest deal was found by Cheapflights users on 2/26. 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 5/810:55 am
SEA
- PHL
2 stops10h 40m
Southwest
Sun 5/107:05 pm
PHL
- SEA
1 stop8h 05m
Southwest
Deal found 2/26![Southwest logo]()
$337
This Southwest deal was found by Cheapflights users on 2/26. 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.
Wed 4/226:50 am
SEA
- PHL
2 stops11h 15m
Southwest
Thu 4/3012:20 pm
PHL
- SEA
2 stops9h 45m
Southwest
Deal found 2/26![Southwest logo]()
$345
This American Airlines deal was found by Cheapflights users on 2/23. 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 3/1111:59 pm
SEA
- SBY
2 stops10h 26m
American Airlines
Wed 3/186:00 am
SBY
- SEA
1 stop9h 51m
American Airlines
Deal found 2/23![American Airlines logo]()
$848
This Delta deal was found by Cheapflights users on 2/23. 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 7/109:50 pm
SEA
- PHL
Nonstop5h 15m
Delta
Mon 7/136:20 pm
PHL
- SEA
1 stop8h 46m
Delta
Deal found 2/23![Delta logo]()
$357
This Southwest deal was found by Cheapflights users on 2/26. 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 3/275:15 am
SEA
- PHL
1 stop13h 30m
Southwest
Tue 3/317:45 am
PHL
- SEA
2 stops11h 00m
Southwest
Deal found 2/26![Southwest logo]()
$374
This Southwest deal was found by Cheapflights users on 2/25. 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 3/1711:55 pm
SEA
- PHL
1 stop7h 40m
Southwest
Fri 3/2011:25 am
PHL
- SEA
2 stops10h 50m
Southwest
Deal found 2/25![Southwest logo]()
$376
This American Airlines deal was found by Cheapflights users on 2/23. 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 3/147:21 am
SEA
- SBY
2 stops12h 14m
American Airlines
Wed 3/181:51 pm
SBY
- SEA
2 stops12h 18m
American Airlines
Deal found 2/23![American Airlines logo]()
$853
This American Airlines deal was found by Cheapflights users on 2/23. 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 3/147:21 am
SEA
- SBY
2 stops12h 14m
American Airlines
Thu 3/192:38 pm
SBY
- SEA
1 stop10h 19m
American Airlines
Deal found 2/23![American Airlines logo]()
$903
This American Airlines deal was found by Cheapflights users on 2/23. 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 3/1212:59 am
SEA
- SBY
2 stops12h 02m
American Airlines
Thu 3/192:38 pm
SBY
- SEA
1 stop10h 19m
American Airlines
Deal found 2/23![American Airlines logo]()
$958
Last-minute flights from Seattle to DelawareDiscover last-minute flight deals from Seattle to Delaware. Data last updated February 27, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Delaware. Data last updated February 27, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 2/23. 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.
Mon 3/1612:24 pm
SEA
- PHL
1 stop14h 07m
Frontier
Thu 3/198:25 pm
PHL
- SEA
1 stop17h 54m
Frontier
Deal found 2/23![Frontier logo]()
$261
This Kiwi.com deal was found by Cheapflights users on 2/24. 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 3/239:55 pm
SEA
- PHL
Nonstop5h 10m
Hawaiian Airlines
Tue 3/316:47 pm
PHL
- SEA
Nonstop6h 05m
Hawaiian Airlines
Deal found 2/24![Hawaiian Airlines logo]()
$266
This Expedia deal was found by Cheapflights users on 2/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/2612:24 pm
SEA
- PHL
1 stop14h 07m
Multiple Airlines
Thu 4/27:25 am
PHL
- SEA
Nonstop6h 05m
Multiple Airlines
Deal found 2/26![Multiple Airlines logo]()
$279
This Delta deal was found by Cheapflights users on 2/25. 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 3/274:55 pm
SEA
- PHL
1 stop9h 46m
Delta
Tue 3/316:49 pm
PHL
- SEA
1 stop8h 14m
Delta
Deal found 2/25![Delta logo]()
$267
This Alaska Airlines deal was found by Cheapflights users on 2/25. 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.
Fri 3/279:55 pm
SEA
- PHL
Nonstop5h 10m
Alaska Airlines
Tue 3/316:47 pm
PHL
- SEA
Nonstop6h 05m
Alaska Airlines
Deal found 2/25![Alaska Airlines logo]()
$269
This Alaska Airlines deal was found by Cheapflights users on 2/24. 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.
Fri 3/279:55 pm
SEA
- PHL
Nonstop5h 10m
Alaska Airlines
Wed 4/17:25 am
PHL
- SEA
Nonstop6h 05m
Alaska Airlines
Deal found 2/24![Alaska Airlines logo]()
$277
This American Airlines deal was found by Cheapflights users on 2/25. 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 3/2710:57 pm
SEA
- PHL
Nonstop5h 05m
American Airlines
Tue 3/316:35 pm
PHL
- SEA
Nonstop6h 22m
American Airlines
Deal found 2/25![American Airlines logo]()
$286
This American Airlines deal was found by Cheapflights users on 2/26. 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 3/2810:57 pm
SEA
- PHL
Nonstop5h 05m
American Airlines
Fri 4/36:35 pm
PHL
- SEA
Nonstop6h 22m
American Airlines
Deal found 2/26![American Airlines logo]()
$275
This Kiwi.com deal was found by Cheapflights users on 2/23. 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 3/299:35 pm
SEA
- PHL
2 stops35h 06m
Frontier
Sun 4/58:25 pm
PHL
- SEA
1 stop18h 12m
Frontier
Deal found 2/23![Frontier logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 2/23. 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 3/316:24 pm
SEA
- PHL
2 stops32h 07m
Frontier
Sun 4/58:25 pm
PHL
- SEA
1 stop18h 12m
Frontier
Deal found 2/23![Frontier logo]()
$255
This Kiwi.com deal was found by Cheapflights users on 2/23. 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 3/316:24 pm
SEA
- PHL
2 stops32h 07m
Frontier
Tue 4/148:41 pm
PHL
- SEA
1 stop15h 46m
Frontier
Deal found 2/23![Frontier logo]()
$257
This American Airlines deal was found by Cheapflights users on 2/25. 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.
Tue 3/316:22 pm
SEA
- PHL
1 stop8h 13m
American Airlines
Tue 4/76:08 pm
PHL
- SEA
Nonstop6h 15m
American Airlines
Deal found 2/25![American Airlines logo]()
$280
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 February 27, 2026.
Search for one-way flight options from Seattle to Delaware. Find affordable one-way fares based on user searches. Data last updated February 27, 2026.
This Trip.com deal was found by Cheapflights users on 2/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1312:42 pm
SEA
- PHL
1 stop13h 49m
Frontier
Deal found 2/27![Frontier logo]()
$66
This Kiwi.com deal was found by Cheapflights users on 2/27. 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 4/147:12 pm
SEA
- PHL
1 stop31h 22m
Frontier
Deal found 2/27![Frontier logo]()
$68
This Kiwi.com deal was found by Cheapflights users on 2/25. 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 4/207:12 pm
SEA
- PHL
1 stop31h 22m
Frontier
Deal found 2/25![Frontier logo]()
$71
This Kiwi.com deal was found by Cheapflights users on 2/24. 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 4/247:12 pm
SEA
- PHL
1 stop31h 23m
Frontier
Deal found 2/24![Frontier logo]()
$72
This Trip.com deal was found by Cheapflights users on 2/25. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/84:20 pm
SEA
- PHL
1 stop10h 14m
Frontier
Deal found 2/25![Frontier logo]()
$75
This Kiwi.com deal was found by Cheapflights users on 2/24. 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
Deal found 2/24![Frontier logo]()
$77
This Kiwi.com deal was found by Cheapflights users on 2/26. 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 4/297:12 pm
SEA
- PHL
1 stop31h 22m
Frontier
Deal found 2/26![Frontier logo]()
$78
This Kiwi.com deal was found by Cheapflights users on 2/26. 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 4/1710:59 pm
SEA
- PHL
2 stops27h 36m
Frontier
Deal found 2/26![Frontier logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 2/27. 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 7/142:16 pm
SEA
- SBY
2 stops27h 46m
Multiple Airlines
Deal found 2/27![Multiple Airlines logo]()
$209
This Kiwi.com deal was found by Cheapflights users on 2/27. 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 7/1211:59 pm
SEA
- SBY
2 stops16h 30m
Multiple Airlines
Deal found 2/27![Multiple Airlines logo]()
$310
This Kiwi.com deal was found by Cheapflights users on 2/27. 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 7/1111:59 pm
SEA
- SBY
3 stops40h 30m
Multiple Airlines
Deal found 2/27![Multiple Airlines logo]()
$317
This Kiwi.com deal was found by Cheapflights users on 2/27. 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 7/1011:25 am
SEA
- SBY
3 stops29h 01m
Multiple Airlines
Deal found 2/27![Multiple Airlines logo]()
$318
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 February 27, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $251 (Kiwi.com) |
One-way from | $66 (Trip.com) |
Popular in | February |
Cheapest in | January |
Average price | $567 |
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 February 27, 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
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Tue 5/5
9:20 am-10:00 pm
2 stops9h 40m
Philadelphia
Wed 5/13
5:45 pm-12:10 am
1 stop9h 25m
$277
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 5/28
11:05 pm-8:55 am
1 stop6h 50m
Philadelphia
Sat 6/6
7:10 am-10:00 am
Nonstop5h 50m
$287
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 3/26
4:55 pm-5:41 am
1 stop9h 46m
Philadelphia
Thu 4/2
6:54 pm-11:40 pm
1 stop7h 46m
$297
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Tue 6/2
9:20 pm-5:35 am
Nonstop5h 15m
Philadelphia
Sun 6/7
7:05 am-10:04 am
Nonstop5h 59m
$312
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Mon 5/4
9:00 pm-10:50 am
2 stops10h 50m
Philadelphia
Sat 5/9
12:25 pm-10:00 pm
2 stops12h 35m
$331
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 5/8
10:55 am-12:35 am
2 stops10h 40m
Philadelphia
Sun 5/10
7:05 pm-12:10 am
1 stop8h 05m
$337
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 4/22
6:50 am-9:05 pm
2 stops11h 15m
Philadelphia
Thu 4/30
12:20 pm-7:05 pm
2 stops9h 45m
$345
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 7/10
9:50 pm-6:05 am
Nonstop5h 15m
Philadelphia
Mon 7/13
6:20 pm-12:06 am
1 stop8h 46m
$357
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 3/26
9:55 pm-6:05 am
Nonstop5h 10m
Philadelphia
Thu 4/2
7:25 am-10:30 am
Nonstop6h 05m
$362
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 3/27
5:15 am-9:45 pm
1 stop13h 30m
Philadelphia
Tue 3/31
7:45 am-3:45 pm
2 stops11h 00m
$374
Showing 1-10 of 33 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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