$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 7/24. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ILG
jul 11 — jul 181
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
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
Cheapest
Best
Last-minute
One-way
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 junho 11, 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 junho 11, 2026.
This Delta deal was found by Cheapflights users on 6/8. 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.
qui 9/109:50 pm
SEA
- PHL
Nonstop5h 15m
Delta
dom 9/137:05 am
PHL
- SEA
Nonstop5h 59m
Delta
Deal found 6/8![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 6/8. 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.
qui 7/1611:10 am
SEA
- PHL
2 stops10h 35m
Southwest
ter 8/112:45 pm
PHL
- SEA
2 stops11h 20m
Southwest
Deal found 6/8![Southwest logo]()
$330
This Kiwi.com deal was found by Cheapflights users on 6/8. 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.
ter 8/257:41 pm
SEA
- PHL
1 stop13h 06m
Frontier
qua 9/212:42 pm
PHL
- SEA
1 stop28h 22m
Frontier
Deal found 6/8![Frontier logo]()
$333
This Alaska Airlines deal was found by Cheapflights users on 6/6. 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.
ter 8/259:27 pm
SEA
- PHL
Nonstop5h 13m
Alaska Airlines
qua 9/26:08 pm
PHL
- SEA
Nonstop5h 52m
Alaska Airlines
Deal found 6/6![Alaska Airlines logo]()
$334
This United Airlines deal was found by Cheapflights users on 6/7. 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.
sex 8/2111:00 pm
SEA
- PHL
1 stop8h 07m
United Airlines
seg 8/243:48 pm
PHL
- SEA
1 stop8h 27m
United Airlines
Deal found 6/7![United Airlines logo]()
$335
This Kiwi.com deal was found by Cheapflights users on 6/10. 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.
qui 8/137:06 pm
SEA
- PHL
2 stops14h 16m
Frontier
seg 8/178:37 pm
PHL
- SEA
1 stop16h 11m
Frontier
Deal found 6/10![Frontier logo]()
$336
This Delta deal was found by Cheapflights users on 6/9. 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.
qua 8/269:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
ter 9/19:40 am
PHL
- SEA
1 stop7h 54m
Delta
Deal found 6/9![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 6/8. 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.
qui 8/611:05 pm
SEA
- PHL
1 stop10h 20m
Southwest
seg 8/106:05 pm
PHL
- SEA
1 stop8h 25m
Southwest
Deal found 6/8![Southwest logo]()
$340
This United Airlines deal was found by Cheapflights users on 6/10. 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.
sáb 7/47:00 am
SEA
- PHL
1 stop7h 53m
United Airlines
sáb 7/186:23 pm
PHL
- SEA
1 stop9h 50m
United Airlines
Deal found 6/10![United Airlines logo]()
$341
This SmartFares deal was found by Cheapflights users on 6/10. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sex 7/310:02 pm
SEA
- PHL
Nonstop5h 11m
Alaska Airlines
sáb 7/117:33 am
PHL
- SEA
Nonstop5h 59m
Alaska Airlines
Deal found 6/10![Alaska Airlines logo]()
$342
This Kiwi.com deal was found by Cheapflights users on 6/8. 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.
qua 8/267:41 pm
SEA
- PHL
1 stop13h 06m
Frontier
qua 9/212:42 pm
PHL
- SEA
1 stop28h 22m
Frontier
Deal found 6/8![Frontier logo]()
$343
This American Airlines deal was found by Cheapflights users on 6/10. 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.
qua 7/156:15 pm
SEA
- PHL
1 stop8h 20m
American Airlines
sáb 7/187:35 pm
PHL
- SEA
Nonstop6h 21m
American Airlines
Deal found 6/10![American Airlines logo]()
$344
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 junho 11, 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 junho 11, 2026.
This Delta deal was found by Cheapflights users on 6/7. 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.
ter 8/119:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
ter 8/187:05 am
PHL
- SEA
Nonstop5h 56m
Delta
Deal found 6/7![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 6/9. 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.
qui 10/2211:30 am
SEA
- PHL
2 stops10h 00m
Southwest
seg 10/2612:20 pm
PHL
- SEA
2 stops11h 05m
Southwest
Deal found 6/9![Southwest logo]()
$345
This United Airlines deal was found by Cheapflights users on 6/10. 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.
sáb 9/197:00 am
SEA
- PHL
1 stop9h 29m
United Airlines
dom 9/2710:40 am
PHL
- SEA
1 stop8h 11m
United Airlines
Deal found 6/10![United Airlines logo]()
$353
This Delta deal was found by Cheapflights users on 6/9. 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.
qua 8/129:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
qua 8/197:05 am
PHL
- SEA
Nonstop5h 56m
Delta
Deal found 6/9![Delta logo]()
$329
This American Airlines deal was found by Cheapflights users on 6/10. 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.
sáb 8/2912:46 pm
SEA
- SBY
1 stop7h 12m
American Airlines
sáb 9/56:41 am
SBY
- SEA
1 stop7h 51m
American Airlines
Deal found 6/10![American Airlines logo]()
$704
This Delta deal was found by Cheapflights users on 6/6. 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.
qui 8/209:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
ter 8/257:05 am
PHL
- SEA
Nonstop5h 56m
Delta
Deal found 6/6![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 6/6. 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.
seg 10/129:05 pm
SEA
- PHL
2 stops10h 55m
Southwest
seg 10/267:50 am
PHL
- SEA
1 stop8h 20m
Southwest
Deal found 6/6![Southwest logo]()
$378
This Delta deal was found by Cheapflights users on 6/8. 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.
qua 8/129:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
ter 8/183:58 pm
PHL
- SEA
1 stop10h 59m
Delta
Deal found 6/8![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 6/10. 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.
qui 8/139:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
seg 8/175:15 am
PHL
- SEA
1 stop9h 53m
Delta
Deal found 6/10![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 6/10. 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.
ter 8/259:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
qui 8/277:20 am
PHL
- SEA
1 stop10h 30m
Delta
Deal found 6/10![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 6/6. 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.
qui 11/269:50 pm
SEA
- PHL
Nonstop5h 13m
Delta
ter 12/16:40 pm
PHL
- SEA
1 stop8h 31m
Delta
Deal found 6/6![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 6/9. 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.
qui 10/2211:53 pm
SEA
- PHL
1 stop7h 47m
Delta
dom 10/257:00 am
PHL
- SEA
1 stop10h 50m
Delta
Deal found 6/9![Delta logo]()
$349
This Delta deal was found by Cheapflights users on 6/6. 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.
qui 7/165:59 pm
SEA
- PHL
1 stop9h 16m
Delta
seg 7/206:57 pm
PHL
- SEA
1 stop8h 01m
Delta
Deal found 6/6![Delta logo]()
$359
This American Airlines deal was found by Cheapflights users on 6/8. 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.
qui 9/248:20 am
SEA
- SBY
1 stop11h 39m
American Airlines
ter 9/296:41 am
SBY
- SEA
1 stop19h 16m
American Airlines
Deal found 6/8![American Airlines logo]()
$772
This American Airlines deal was found by Cheapflights users on 6/7. 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.
sex 9/48:10 am
SEA
- SBY
1 stop11h 48m
American Airlines
seg 9/76:41 am
SBY
- SEA
1 stop17h 17m
American Airlines
Deal found 6/7![American Airlines logo]()
$774
This American Airlines deal was found by Cheapflights users on 6/7. 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.
sex 8/218:10 am
SEA
- SBY
1 stop11h 48m
American Airlines
seg 8/246:41 am
SBY
- SEA
1 stop19h 15m
American Airlines
Deal found 6/7![American Airlines logo]()
$801
This American Airlines deal was found by Cheapflights users on 6/7. 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.
sex 7/248:20 am
SEA
- SBY
1 stop11h 38m
American Airlines
seg 7/276:41 am
SBY
- SEA
1 stop17h 54m
American Airlines
Deal found 6/7![American Airlines logo]()
$818
This American Airlines deal was found by Cheapflights users on 6/9. 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.
qua 6/247:31 am
SEA
- SBY
2 stops11h 33m
American Airlines
dom 6/286:40 am
SBY
- SEA
1 stop8h 06m
American Airlines
Deal found 6/9![American Airlines logo]()
$1,001
This American Airlines deal was found by Cheapflights users on 6/7. 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.
sex 6/265:15 am
SEA
- SBY
1 stop7h 54m
American Airlines
seg 6/296:40 am
SBY
- SEA
2 stops10h 35m
American Airlines
Deal found 6/7![American Airlines logo]()
$1,181
Last-minute flights from Seattle to DelawareDiscover last-minute flight deals from Seattle to Delaware. Data last updated junho 11, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Delaware. Data last updated junho 11, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 6/9. 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.
qua 7/19:30 am
SEA
- PHL
2 stops8h 50m
Southwest
seg 8/3112:45 pm
PHL
- SEA
2 stops11h 00m
Southwest
Deal found 6/9![Southwest logo]()
$355
This SmartFares deal was found by Cheapflights users on 6/10. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sex 7/310:02 pm
SEA
- PHL
Nonstop5h 11m
Alaska Airlines
sáb 7/117:33 am
PHL
- SEA
Nonstop5h 59m
Alaska Airlines
Deal found 6/10![Alaska Airlines logo]()
$342
This Southwest deal was found by Cheapflights users on 6/10. 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.
sex 7/35:30 am
SEA
- PHL
1 stop9h 50m
Southwest
sáb 7/412:00 pm
PHL
- SEA
2 stops11h 10m
Southwest
Deal found 6/10![Southwest logo]()
$354
This United Airlines deal was found by Cheapflights users on 6/10. 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.
sáb 7/47:00 am
SEA
- PHL
1 stop7h 53m
United Airlines
sáb 7/186:23 pm
PHL
- SEA
1 stop9h 50m
United Airlines
Deal found 6/10![United Airlines logo]()
$341
This American Airlines deal was found by Cheapflights users on 6/9. 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.
qui 7/98:20 am
SEA
- PHL
Nonstop5h 22m
American Airlines
dom 7/127:35 pm
PHL
- SEA
Nonstop6h 21m
American Airlines
Deal found 6/9![American Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 6/7. 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.
qui 7/99:20 pm
SEA
- PHL
Nonstop5h 09m
Delta
seg 7/136:55 pm
PHL
- SEA
1 stop8h 04m
Delta
Deal found 6/7![Delta logo]()
$339
This American Airlines deal was found by Cheapflights users on 6/10. 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.
qua 7/156:15 pm
SEA
- PHL
1 stop8h 20m
American Airlines
sáb 7/187:35 pm
PHL
- SEA
Nonstop6h 21m
American Airlines
Deal found 6/10![American Airlines logo]()
$344
This American Airlines deal was found by Cheapflights users on 6/11. 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.
qua 7/156:15 pm
SEA
- PHL
1 stop8h 20m
American Airlines
qua 7/226:21 pm
PHL
- SEA
Nonstop6h 14m
American Airlines
Deal found 6/11![American Airlines logo]()
$345
This Southwest deal was found by Cheapflights users on 6/8. 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.
qui 7/1611:10 am
SEA
- PHL
2 stops10h 35m
Southwest
ter 8/112:45 pm
PHL
- SEA
2 stops11h 20m
Southwest
Deal found 6/8![Southwest logo]()
$330
This Delta deal was found by Cheapflights users on 6/8. 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.
qui 7/165:59 pm
SEA
- PHL
1 stop9h 16m
Delta
ter 8/113:58 pm
PHL
- SEA
1 stop10h 59m
Delta
Deal found 6/8![Delta logo]()
$349
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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.
qua 7/2210:02 pm
SEA
- PHL
Nonstop5h 11m
Alaska Airlines
seg 8/37:33 am
PHL
- SEA
Nonstop5h 59m
Alaska Airlines
Deal found 6/10![Alaska Airlines logo]()
$334
This Kiwi.com deal was found by Cheapflights users on 6/10. 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.
qua 7/227:06 pm
SEA
- PHL
2 stops24h 22m
Frontier
seg 8/38:37 pm
PHL
- SEA
1 stop15h 40m
Frontier
Deal found 6/10![Frontier logo]()
$353
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 junho 11, 2026.
Search for one-way flight options from Seattle to Delaware. Find affordable one-way fares based on user searches. Data last updated junho 11, 2026.
This Delta deal was found by Cheapflights users on 6/7. 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.
qui 7/99:20 pm
SEA
- PHL
Nonstop5h 09m
Delta
Deal found 6/7![Delta logo]()
$165
This United Airlines deal was found by Cheapflights users on 6/10. 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.
qui 7/910:29 am
SEA
- PHL
1 stop11h 54m
United Airlines
Deal found 6/10![United Airlines logo]()
$168
This Delta deal was found by Cheapflights users on 6/6. 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.
ter 7/79:20 pm
SEA
- PHL
Nonstop5h 09m
Delta
Deal found 6/6![Delta logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 6/10. 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.
seg 8/108:53 pm
SEA
- PHL
2 stops35h 56m
Frontier
Deal found 6/10![Frontier logo]()
$171
This United Airlines deal was found by Cheapflights users on 6/6. 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.
ter 9/111:03 am
SEA
- PHL
2 stops10h 56m
United Airlines
Deal found 6/6![United Airlines logo]()
$172
This Delta deal was found by Cheapflights users on 6/8. 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.
dom 9/66:05 am
SEA
- PHL
1 stop8h 54m
Delta
Deal found 6/8![Delta logo]()
$175
This Southwest deal was found by Cheapflights users on 6/7. 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.
qua 7/110:45 pm
SEA
- PHL
1 stop11h 35m
Southwest
Deal found 6/7![Southwest logo]()
$180
This Super.com deal was found by Cheapflights users on 6/8. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ter 6/307:41 pm
SEA
- PHL
1 stop13h 06m
Frontier
Deal found 6/8![Frontier logo]()
$181
This Southwest deal was found by Cheapflights users on 6/10. 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.
qua 7/811:05 pm
SEA
- PHL
1 stop9h 50m
Southwest
Deal found 6/10![Southwest logo]()
$185
This CheapOair deal was found by Cheapflights users on 6/10. 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.
ter 7/78:13 pm
SEA
- PHL
1 stop30h 47m
Frontier
Deal found 6/10![Frontier logo]()
$186
This United Airlines deal was found by Cheapflights users on 6/8. 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.
qui 7/210:29 am
SEA
- PHL
1 stop11h 54m
United Airlines
Deal found 6/8![United Airlines logo]()
$187
This Delta deal was found by Cheapflights users on 6/10. 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.
sáb 8/229:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Deal found 6/10![Delta logo]()
$189
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 junho 11, 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 | $462 |
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 junho 11, 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
ter 8/11
9:30 pm-5:50 am
Nonstop5h 20m
Philadelphia
ter 8/18
7:05 am-10:01 am
Nonstop5h 56m
$329
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
qua 8/12
9:30 pm-5:50 am
Nonstop5h 20m
Philadelphia
qua 8/19
7:05 am-10:01 am
Nonstop5h 56m
$329
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
qui 8/20
9:30 pm-5:50 am
Nonstop5h 20m
Philadelphia
ter 8/25
7:05 am-10:01 am
Nonstop5h 56m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
qua 8/12
9:30 pm-5:50 am
Nonstop5h 20m
Philadelphia
ter 8/18
3:58 pm-11:57 pm
1 stop10h 59m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
qui 8/13
9:30 pm-5:50 am
Nonstop5h 20m
Philadelphia
seg 8/17
5:15 am-12:08 pm
1 stop9h 53m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
ter 8/25
9:30 pm-5:50 am
Nonstop5h 20m
Philadelphia
qui 8/27
7:20 am-2:50 pm
1 stop10h 30m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
qui 11/26
9:50 pm-6:03 am
Nonstop5h 13m
Philadelphia
ter 12/1
6:40 pm-12:11 am
1 stop8h 31m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
qui 10/22
11:30 am-12:30 am
2 stops10h 00m
Philadelphia
seg 10/26
12:20 pm-8:25 pm
2 stops11h 05m
$345
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
qui 10/22
11:53 pm-10:40 am
1 stop7h 47m
Philadelphia
dom 10/25
7:00 am-2:50 pm
1 stop10h 50m
$349
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
sáb 9/19
7:00 am-7:29 pm
1 stop9h 29m
Philadelphia
dom 9/27
10:40 am-3:51 pm
1 stop8h 11m
$353
Showing 1-10 of 34 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.
Related info for your journey
Find useful and relevant information for your journey from Seattle to Delaware. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Top destinations