$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 4/17. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
Apr 4 — Apr 111
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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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 5, 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 5, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/28. 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 4/177:12 pm
SEA
- PHL
1 stop31h 23m
Multiple Airlines
Mon 6/17:00 am
PHL
- SEA
2 stops15h 59m
Multiple Airlines
Deal found 2/28![Multiple Airlines logo]()
$259
This Expedia deal was found by Cheapflights users on 3/1. 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.
Tue 5/59:44 pm
SEA
- PHL
Nonstop5h 18m
Multiple Airlines
Thu 5/78:25 pm
PHL
- SEA
1 stop16h 02m
Multiple Airlines
Deal found 3/1![Multiple Airlines logo]()
$260
This Kiwi.com deal was found by Cheapflights users on 2/28. 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
1 stop13h 49m
Frontier
Thu 4/238:41 pm
PHL
- SEA
1 stop21h 24m
Frontier
Deal found 2/28![Frontier logo]()
$262
This Trip.com deal was found by Cheapflights users on 3/3. 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 4/139:55 pm
SEA
- PHL
Nonstop5h 10m
Hawaiian Airlines
Tue 4/216:47 pm
PHL
- SEA
Nonstop6h 05m
Hawaiian Airlines
Deal found 3/3![Hawaiian Airlines logo]()
$263
This Trip.com deal was found by Cheapflights users on 3/2. 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
2 stops15h 42m
Frontier
Sun 5/108:25 pm
PHL
- SEA
1 stop16h 02m
Frontier
Deal found 3/2![Frontier logo]()
$264
This Kiwi.com deal was found by Cheapflights users on 3/3. 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 5/74:20 pm
SEA
- PHL
1 stop10h 14m
Frontier
Sun 5/104:42 pm
PHL
- SEA
2 stops19h 45m
Frontier
Deal found 3/3![Frontier logo]()
$265
This Expedia deal was found by Cheapflights users on 3/3. 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.
Mon 6/19:14 pm
SEA
- PHL
1 stop29h 23m
Frontier
Thu 6/48:36 pm
PHL
- SEA
1 stop26h 23m
Frontier
Deal found 3/3![Frontier logo]()
$266
This Kiwi.com deal was found by Cheapflights users on 3/3. 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 4/129:55 pm
SEA
- PHL
Nonstop5h 10m
Alaska Airlines
Tue 4/216:47 pm
PHL
- SEA
Nonstop6h 05m
Alaska Airlines
Deal found 3/3![Alaska Airlines logo]()
$267
This Delta deal was found by Cheapflights users on 3/2. 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 5/89:20 pm
SEA
- PHL
Nonstop5h 17m
Delta
Sun 5/107:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 3/2![Delta logo]()
$269
This Expedia deal was found by Cheapflights users on 3/3. 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 4/912:42 pm
SEA
- PHL
1 stop13h 49m
Multiple Airlines
Thu 4/167:25 am
PHL
- SEA
Nonstop6h 05m
Multiple Airlines
Deal found 3/3![Multiple Airlines logo]()
$270
This Kiwi.com deal was found by Cheapflights users on 2/28. 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 4/1312:42 pm
SEA
- PHL
1 stop13h 49m
Frontier
Sun 4/263:29 pm
PHL
- SEA
2 stops26h 36m
Frontier
Deal found 2/28![Frontier logo]()
$271
This Kiwi.com deal was found by Cheapflights users on 2/28. 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
1 stop13h 49m
Frontier
Sun 4/268:36 pm
PHL
- SEA
1 stop15h 51m
Frontier
Deal found 2/28![Frontier logo]()
$272
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 5, 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 5, 2026.
This Delta deal was found by Cheapflights users on 3/4. 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 5/279:20 pm
SEA
- PHL
Nonstop5h 17m
Delta
Mon 6/17:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 3/4![Delta logo]()
$289
This United Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/111:59 pm
SEA
- PHL
1 stop7h 29m
United Airlines
Tue 4/71:27 pm
PHL
- SEA
2 stops10h 39m
United Airlines
Deal found 3/5![United Airlines logo]()
$302
This Southwest deal was found by Cheapflights users on 3/2. 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 4/19:50 am
SEA
- PHL
2 stops11h 00m
Southwest
Tue 4/214:00 pm
PHL
- SEA
2 stops10h 35m
Southwest
Deal found 3/2![Southwest logo]()
$333
This Delta deal was found by Cheapflights users on 3/5. 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 5/289:20 pm
SEA
- PHL
Nonstop5h 17m
Delta
Sat 6/67:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 3/5![Delta logo]()
$289
This Delta deal was found by Cheapflights users on 3/3. 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.
Mon 5/1110:35 pm
SEA
- PHL
1 stop7h 52m
Delta
Mon 6/17:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 3/3![Delta logo]()
$299
This American Airlines deal was found by Cheapflights users on 3/1. 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 3/1710:57 pm
SEA
- SBY
1 stop12h 16m
American Airlines
Sat 3/217:43 am
SBY
- SEA
1 stop17h 14m
American Airlines
Deal found 3/1![American Airlines logo]()
$692
This Delta deal was found by Cheapflights users on 3/3. 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.
Sun 5/107:59 pm
SEA
- PHL
1 stop7h 11m
Delta
Tue 6/26:24 pm
PHL
- SEA
1 stop8h 33m
Delta
Deal found 3/3![Delta logo]()
$309
This Southwest deal was found by Cheapflights users on 3/3. 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 5/126:50 am
SEA
- PHL
2 stops11h 15m
Southwest
Tue 6/94:35 pm
PHL
- SEA
2 stops10h 55m
Southwest
Deal found 3/3![Southwest logo]()
$382
This Southwest deal was found by Cheapflights users on 3/1. 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.
Thu 5/710:55 am
SEA
- PHL
2 stops10h 40m
Southwest
Sun 5/105:20 am
PHL
- SEA
2 stops11h 20m
Southwest
Deal found 3/1![Southwest logo]()
$387
This Delta deal was found by Cheapflights users on 2/28. 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.
Mon 5/119:20 pm
SEA
- PHL
Nonstop5h 17m
Delta
Mon 5/187:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 2/28![Delta logo]()
$333
This Southwest deal was found by Cheapflights users on 3/1. 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 3/169:05 am
SEA
- PHL
2 stops10h 40m
Southwest
Sat 3/217:45 am
PHL
- SEA
1 stop7h 55m
Southwest
Deal found 3/1![Southwest logo]()
$404
This Delta deal was found by Cheapflights users on 3/1. 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 3/184:55 pm
SEA
- PHL
1 stop9h 46m
Delta
Wed 4/156:54 pm
PHL
- SEA
1 stop8h 05m
Delta
Deal found 3/1![Delta logo]()
$363
This Southwest deal was found by Cheapflights users on 3/4. 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 6/39:20 am
SEA
- PHL
2 stops9h 40m
Southwest
Mon 8/311:20 am
PHL
- SEA
2 stops11h 50m
Southwest
Deal found 3/4![Southwest logo]()
$412
This American Airlines deal was found by Cheapflights users on 3/1. 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 4/211:59 pm
SEA
- SBY
2 stops11h 14m
American Airlines
Sat 4/111:47 pm
SBY
- SEA
1 stop10h 17m
American Airlines
Deal found 3/1![American Airlines logo]()
$758
This American Airlines deal was found by Cheapflights users on 3/1. 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 4/37:21 am
SEA
- SBY
2 stops12h 14m
American Airlines
Sat 4/111:47 pm
SBY
- SEA
1 stop10h 17m
American Airlines
Deal found 3/1![American Airlines logo]()
$824
This American Airlines deal was found by Cheapflights users on 3/4. 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 3/2010:57 pm
SEA
- SBY
1 stop12h 16m
American Airlines
Tue 3/247:43 am
SBY
- SEA
2 stops14h 42m
American Airlines
Deal found 3/4![American Airlines logo]()
$829
This American Airlines deal was found by Cheapflights users on 3/3. 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 3/1712:59 am
SEA
- SBY
2 stops12h 02m
American Airlines
Sun 3/224:26 pm
SBY
- SEA
2 stops11h 29m
American Airlines
Deal found 3/3![American Airlines logo]()
$928
This American Airlines deal was found by Cheapflights users on 3/5. 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 6/188:10 am
SEA
- SBY
1 stop12h 00m
American Airlines
Tue 6/236:40 am
SBY
- SEA
2 stops10h 36m
American Airlines
Deal found 3/5![American Airlines logo]()
$973
Last-minute flights from Seattle to DelawareDiscover last-minute flight deals from Seattle to Delaware. Data last updated March 5, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Delaware. Data last updated March 5, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 2/28. 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 2/28![American Airlines logo]()
$273
This Alaska Airlines deal was found by Cheapflights users on 2/28. 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.
Wed 4/19:55 pm
SEA
- PHL
Nonstop5h 10m
Alaska Airlines
Thu 4/97:25 am
PHL
- SEA
Nonstop6h 05m
Alaska Airlines
Deal found 2/28![Alaska Airlines logo]()
$269
This Kiwi.com deal was found by Cheapflights users on 2/28. 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
1 stop13h 49m
Frontier
Thu 4/238:41 pm
PHL
- SEA
1 stop21h 24m
Frontier
Deal found 2/28![Frontier logo]()
$262
This Expedia deal was found by Cheapflights users on 3/3. 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 4/912:42 pm
SEA
- PHL
1 stop13h 49m
Multiple Airlines
Thu 4/167:25 am
PHL
- SEA
Nonstop6h 05m
Multiple Airlines
Deal found 3/3![Multiple Airlines logo]()
$270
This Kiwi.com deal was found by Cheapflights users on 2/28. 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
1 stop13h 49m
Frontier
Sun 4/268:36 pm
PHL
- SEA
1 stop15h 51m
Frontier
Deal found 2/28![Frontier logo]()
$272
This Kiwi.com deal was found by Cheapflights users on 3/4. 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 4/910:05 pm
SEA
- PHL
2 stops22h 06m
Frontier
Wed 4/158:41 pm
PHL
- SEA
1 stop21h 24m
Frontier
Deal found 3/4![Frontier logo]()
$275
This Kiwi.com deal was found by Cheapflights users on 3/3. 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 4/129:55 pm
SEA
- PHL
Nonstop5h 10m
Alaska Airlines
Tue 4/216:47 pm
PHL
- SEA
Nonstop6h 05m
Alaska Airlines
Deal found 3/3![Alaska Airlines logo]()
$267
This Expedia deal was found by Cheapflights users on 3/1. 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.
Mon 4/139:34 pm
SEA
- PHL
1 stop30h 16m
Multiple Airlines
Tue 4/287:22 am
PHL
- SEA
Nonstop5h 58m
Multiple Airlines
Deal found 3/1![Multiple Airlines logo]()
$260
This Trip.com deal was found by Cheapflights users on 3/3. 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 4/139:55 pm
SEA
- PHL
Nonstop5h 10m
Hawaiian Airlines
Tue 4/216:47 pm
PHL
- SEA
Nonstop6h 05m
Hawaiian Airlines
Deal found 3/3![Hawaiian Airlines logo]()
$263
This Kiwi.com deal was found by Cheapflights users on 2/28. 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 4/1312:42 pm
SEA
- PHL
1 stop13h 49m
Frontier
Sun 4/263:29 pm
PHL
- SEA
2 stops26h 36m
Frontier
Deal found 2/28![Frontier logo]()
$271
This Kiwi.com deal was found by Cheapflights users on 2/28. 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 4/164:20 pm
SEA
- PHL
1 stop10h 14m
Frontier
Mon 6/19:00 am
PHL
- SEA
2 stops28h 10m
Frontier
Deal found 2/28![Frontier logo]()
$276
This Kiwi.com deal was found by Cheapflights users on 2/28. 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 4/177:12 pm
SEA
- PHL
1 stop31h 23m
Multiple Airlines
Mon 6/17:00 am
PHL
- SEA
2 stops15h 59m
Multiple Airlines
Deal found 2/28![Multiple Airlines logo]()
$259
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 5, 2026.
Search for one-way flight options from Seattle to Delaware. Find affordable one-way fares based on user searches. Data last updated March 5, 2026.
This Trip.com deal was found by Cheapflights users on 3/3. 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 4/174:20 pm
SEA
- PHL
1 stop10h 14m
Frontier
Deal found 3/3![Frontier logo]()
$66
This Kiwi.com deal was found by Cheapflights users on 3/3. 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 4/277:12 pm
SEA
- PHL
1 stop31h 22m
Frontier
Deal found 3/3![Frontier logo]()
$81
This Kiwi.com deal was found by Cheapflights users on 2/28. 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 5/17:12 pm
SEA
- PHL
1 stop31h 23m
Frontier
Deal found 2/28![Frontier logo]()
$82
This Kiwi.com deal was found by Cheapflights users on 3/2. 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 5/47:12 pm
SEA
- PHL
1 stop31h 22m
Frontier
Deal found 3/2![Frontier logo]()
$84
This eDestinos deal was found by Cheapflights users on 3/2. 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 5/88:05 pm
SEA
- PHL
1 stop30h 29m
Multiple Airlines
Deal found 3/2![Multiple Airlines logo]()
$87
This eDestinos deal was found by Cheapflights users on 2/28. 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 5/86:57 pm
SEA
- PHL
1 stop7h 37m
Frontier
Deal found 2/28![Frontier logo]()
$91
This Kiwi.com deal was found by Cheapflights users on 3/3. 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 5/27:12 pm
SEA
- PHL
1 stop31h 22m
Frontier
Deal found 3/3![Frontier logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 3/3. 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 4/269:54 pm
SEA
- PHL
2 stops52h 40m
Frontier
Deal found 3/3![Frontier logo]()
$96
This Kiwi.com deal was found by Cheapflights users on 3/3. 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 4/1210:01 pm
SEA
- PHL
2 stops52h 33m
Frontier
Deal found 3/3![Frontier logo]()
$98
This Frontier deal was found by Cheapflights users on 3/3. 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.
Wed 4/297:12 pm
SEA
- PHL
1 stop7h 22m
Frontier
Deal found 3/3![Frontier logo]()
$100
This Kiwi.com deal was found by Cheapflights users on 3/4. 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 6/252:16 pm
SEA
- SBY
2 stops26h 13m
Multiple Airlines
Deal found 3/4![Multiple Airlines logo]()
$589
This American Airlines deal was found by Cheapflights users on 3/4. 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 6/248:10 am
SEA
- SBY
1 stop12h 00m
American Airlines
Deal found 3/4![American Airlines logo]()
$600
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 5, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $259 (Kiwi.com) |
One-way from | $66 (Trip.com) |
Popular in | February |
Cheapest in | January |
Average price | $397 |
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 5, 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
Wed 5/27
9:20 pm-5:37 am
Nonstop5h 17m
Philadelphia
Mon 6/1
7:10 am-10:00 am
Nonstop5h 50m
$289
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 5/28
9:20 pm-5:37 am
Nonstop5h 17m
Philadelphia
Sat 6/6
7:10 am-10:00 am
Nonstop5h 50m
$289
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Mon 5/11
10:35 pm-9:27 am
1 stop7h 52m
Philadelphia
Mon 6/1
7:10 am-10:00 am
Nonstop5h 50m
$299
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 4/1
11:59 pm-10:28 am
1 stop7h 29m
Philadelphia
Tue 4/7
1:27 pm-9:06 pm
2 stops10h 39m
$302
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Sun 5/10
7:59 pm-6:10 am
1 stop7h 11m
Philadelphia
Tue 6/2
6:24 pm-11:57 pm
1 stop8h 33m
$309
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 4/1
9:50 am-11:50 pm
2 stops11h 00m
Philadelphia
Tue 4/21
4:00 pm-11:35 pm
2 stops10h 35m
$333
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Mon 5/11
9:20 pm-5:37 am
Nonstop5h 17m
Philadelphia
Mon 5/18
7:10 am-10:00 am
Nonstop5h 50m
$333
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 3/18
4:55 pm-5:41 am
1 stop9h 46m
Philadelphia
Wed 4/15
6:54 pm-11:59 pm
1 stop8h 05m
$363
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Tue 5/12
6:50 am-9:05 pm
2 stops11h 15m
Philadelphia
Tue 6/9
4:35 pm-12:30 am
2 stops10h 55m
$382
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 5/7
10:55 am-12:35 am
2 stops10h 40m
Philadelphia
Sun 5/10
5:20 am-1:40 pm
2 stops11h 20m
$387
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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