$119+ Cheap flights from Pennsylvania to Seattle (SEA)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/24. Fares are subject to change and may not be available on all flights or dates of travel.
PHL ā SEA
Aug 28 ā Sep 41
Round-trip
1 adult, Economy
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Cheapest flights from Pennsylvania to SeattleExplore the most affordable flight options available from Pennsylvania to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2026.
Explore the most affordable flight options available from Pennsylvania to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/247:00 am
ABE
- SEA
1 stop29h 19m
Multiple Airlines
Wed 8/267:06 pm
SEA
- ABE
2 stops23h 01m
Multiple Airlines
Deal found 7/28![Multiple Airlines logo]()
$269
This Trip.com deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Trip.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sun 9/68:00 am
DCA
- SEA
Nonstop5h 54m
Multiple Airlines
Tue 9/154:27 pm
SEA
- DCA
1 stop26h 32m
Multiple Airlines
Deal found 7/28![Multiple Airlines logo]()
$286
This Super.com deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Super.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 8/198:59 am
IAD
- SEA
1 stop28h 40m
Frontier
Wed 8/268:53 pm
SEA
- IAD
1 stop8h 11m
Frontier
Deal found 7/28![Frontier logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 8/268:59 am
IAD
- SEA
1 stop28h 40m
Frontier
Wed 9/27:06 pm
SEA
- IAD
2 stops19h 08m
Frontier
Deal found 7/27![Frontier logo]()
$288
This Booking.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Booking.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 9/55:00 pm
DCA
- SEA
Nonstop5h 51m
Multiple Airlines
Thu 9/104:27 pm
SEA
- DCA
1 stop26h 32m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$288
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/179:50 am
IAD
- SEA
1 stop27h 49m
Frontier
Wed 8/267:06 pm
SEA
- IAD
2 stops19h 08m
Frontier
Deal found 7/27![Frontier logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 8/189:13 am
IAD
- SEA
1 stop28h 26m
Frontier
Wed 8/262:37 pm
SEA
- IAD
2 stops18h 06m
Frontier
Deal found 7/27![Frontier logo]()
$290
This Southwest deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Southwest is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sun 9/66:05 am
DCA
- SEA
2 stops9h 55m
Southwest
Tue 9/1511:05 pm
SEA
- DCA
1 stop9h 20m
Southwest
Deal found 7/28![Southwest logo]()
$290
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 8/189:13 am
IAD
- SEA
1 stop28h 26m
Frontier
Fri 8/211:35 pm
SEA
- IAD
2 stops15h 29m
Frontier
Deal found 7/27![Frontier logo]()
$291
This Kiwi.com deal was found by Cheapflights users on 7/24. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 8/139:50 am
IAD
- SEA
1 stop28h 14m
Frontier
Tue 8/188:53 pm
SEA
- IAD
1 stop32h 11m
Frontier
Deal found 7/24![Frontier logo]()
$292
This Alaska Airlines deal was found by Cheapflights users on 7/24. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Alaska Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 9/15:00 pm
DCA
- SEA
Nonstop5h 51m
Alaska Airlines
Fri 9/111:46 pm
SEA
- DCA
Nonstop5h 13m
Alaska Airlines
Deal found 7/24![Alaska Airlines logo]()
$292
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 8/208:59 am
IAD
- SEA
1 stop28h 40m
Frontier
Mon 8/249:29 pm
SEA
- IAD
2 stops22h 23m
Frontier
Deal found 7/27![Frontier logo]()
$293
Best flights from Pennsylvania to SeattleDiscover carefully curated flight deals from Pennsylvania to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2026.
Discover carefully curated flight deals from Pennsylvania to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2026.
This Alaska Airlines deal was found by Cheapflights users on 7/26. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Alaska Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 9/97:35 pm
IAD
- SEA
1 stop16h 45m
Alaska Airlines
Wed 9/169:35 pm
SEA
- IAD
Nonstop5h 05m
Alaska Airlines
Deal found 7/26![Alaska Airlines logo]()
$300
This Southwest deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Southwest is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 10/1512:00 pm
PIT
- SEA
2 stops13h 30m
Southwest
Mon 10/199:15 pm
SEA
- PIT
2 stops10h 00m
Southwest
Deal found 7/28![Southwest logo]()
$312
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 12/116:51 pm
PHL
- SEA
1 stop8h 23m
United Airlines
Mon 12/147:32 pm
SEA
- PHL
1 stop9h 13m
United Airlines
Deal found 7/23![United Airlines logo]()
$335
This Delta deal was found by Cheapflights users on 7/26. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sun 10/47:05 am
PHL
- SEA
Nonstop5h 51m
Delta
Sun 10/119:29 pm
SEA
- PHL
Nonstop5h 08m
Delta
Deal found 7/26![Delta logo]()
$339
This JetBlue deal was found by Cheapflights users on 7/26. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure JetBlue is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 9/265:29 pm
JFK
- SEA
Nonstop6h 15m
JetBlue
Tue 10/69:40 pm
SEA
- JFK
Nonstop5h 21m
JetBlue
Deal found 7/26![JetBlue logo]()
$347
This American Airlines deal was found by Cheapflights users on 7/24. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure American Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 9/236:07 am
SCE
- SEA
1 stop8h 33m
American Airlines
Mon 9/2810:45 pm
SEA
- SCE
1 stop8h 23m
American Airlines
Deal found 7/24![American Airlines logo]()
$379
This Alaska Airlines deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Alaska Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 9/57:35 pm
IAD
- SEA
1 stop16h 45m
Alaska Airlines
Mon 9/149:35 pm
SEA
- IAD
Nonstop5h 05m
Alaska Airlines
Deal found 7/27![Alaska Airlines logo]()
$300
This Southwest deal was found by Cheapflights users on 7/26. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Southwest is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 9/46:30 pm
PIT
- SEA
1 stop9h 15m
Southwest
Fri 9/115:15 am
SEA
- PIT
1 stop7h 15m
Southwest
Deal found 7/26![Southwest logo]()
$328
This Alaska Airlines deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Alaska Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 8/268:00 am
DCA
- SEA
Nonstop5h 54m
Alaska Airlines
Wed 9/28:00 am
SEA
- DCA
Nonstop5h 20m
Alaska Airlines
Deal found 7/25![Alaska Airlines logo]()
$305
This United Airlines deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 8/216:00 pm
IAD
- SEA
Nonstop5h 45m
United Airlines
Fri 8/2811:59 pm
SEA
- IAD
1 stop8h 29m
United Airlines
Deal found 7/25![United Airlines logo]()
$338
This Delta deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 10/287:00 am
PHL
- SEA
Nonstop5h 58m
Delta
Tue 11/176:00 am
SEA
- PHL
1 stop7h 35m
Delta
Deal found 7/27![Delta logo]()
$349
This JetBlue deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure JetBlue is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 9/85:45 pm
JFK
- SEA
Nonstop6h 23m
JetBlue
Tue 9/1511:42 pm
SEA
- JFK
1 stop9h 52m
JetBlue
Deal found 7/27![JetBlue logo]()
$353
This Southwest deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Southwest is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 8/263:50 pm
DCA
- SEA
2 stops10h 15m
Southwest
Wed 9/28:55 am
SEA
- DCA
1 stop10h 25m
Southwest
Deal found 7/27![Southwest logo]()
$330
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 9/96:15 am
IAD
- SEA
1 stop8h 17m
United Airlines
Wed 9/1611:00 pm
SEA
- IAD
1 stop7h 23m
United Airlines
Deal found 7/23![United Airlines logo]()
$347
This Delta deal was found by Cheapflights users on 7/23. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 8/263:58 pm
PHL
- SEA
1 stop10h 59m
Delta
Mon 8/319:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Deal found 7/23![Delta logo]()
$349
This JetBlue deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure JetBlue is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/3112:34 pm
PIT
- SEA
1 stop13h 19m
JetBlue
Wed 9/211:40 am
SEA
- PIT
1 stop9h 07m
JetBlue
Deal found 7/28![JetBlue logo]()
$358
This Southwest deal was found by Cheapflights users on 7/23. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Southwest is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 9/104:35 pm
DCA
- SEA
2 stops10h 20m
Southwest
Thu 9/1711:05 pm
SEA
- DCA
1 stop9h 45m
Southwest
Deal found 7/23![Southwest logo]()
$330
This Alaska Airlines deal was found by Cheapflights users on 7/24. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Alaska Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 8/186:03 am
IAD
- SEA
Nonstop5h 45m
Alaska Airlines
Tue 8/259:35 pm
SEA
- IAD
Nonstop5h 05m
Alaska Airlines
Deal found 7/24![Alaska Airlines logo]()
$345
This Delta deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Fri 10/167:16 pm
PHL
- SEA
1 stop7h 43m
Delta
Mon 10/199:29 pm
SEA
- PHL
Nonstop5h 08m
Delta
Deal found 7/27![Delta logo]()
$349
This United Airlines deal was found by Cheapflights users on 7/26. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 10/310:40 am
PHL
- SEA
2 stops9h 57m
United Airlines
Fri 10/911:14 pm
SEA
- PHL
1 stop7h 28m
United Airlines
Deal found 7/26![United Airlines logo]()
$354
This JetBlue deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure JetBlue is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 9/151:00 pm
JFK
- SEA
1 stop12h 37m
JetBlue
Sun 9/2011:42 pm
SEA
- JFK
1 stop9h 52m
JetBlue
Deal found 7/28![JetBlue logo]()
$369
This Southwest deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Southwest is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 9/82:45 pm
PHL
- SEA
2 stops11h 25m
Southwest
Sat 9/125:30 am
SEA
- PHL
2 stops12h 20m
Southwest
Deal found 7/25![Southwest logo]()
$339
This Delta deal was found by Cheapflights users on 7/26. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 10/39:35 am
PHL
- SEA
1 stop8h 14m
Delta
Fri 10/99:29 pm
SEA
- PHL
Nonstop5h 08m
Delta
Deal found 7/26![Delta logo]()
$349
This Alaska Airlines deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Alaska Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 8/188:59 am
DCA
- SEA
1 stop10h 59m
Alaska Airlines
Mon 8/2410:59 pm
SEA
- DCA
1 stop14h 01m
Alaska Airlines
Deal found 7/25![Alaska Airlines logo]()
$356
This United Airlines deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 10/101:05 pm
IAD
- SEA
Nonstop5h 46m
United Airlines
Wed 10/1411:14 pm
SEA
- IAD
Nonstop5h 03m
United Airlines
Deal found 7/27![United Airlines logo]()
$357
This JetBlue deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure JetBlue is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 9/193:30 pm
JFK
- SEA
1 stop10h 07m
JetBlue
Sat 9/269:40 pm
SEA
- JFK
Nonstop5h 24m
JetBlue
Deal found 7/28![JetBlue logo]()
$373
This Southwest deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Southwest is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 8/2712:50 pm
PIT
- SEA
2 stops13h 05m
Southwest
Mon 8/3111:05 pm
SEA
- PIT
2 stops10h 00m
Southwest
Deal found 7/28![Southwest logo]()
$340
This Alaska Airlines deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Alaska Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 9/211:55 am
JFK
- SEA
1 stop9h 57m
Alaska Airlines
Sat 9/126:51 pm
SEA
- JFK
1 stop8h 10m
Alaska Airlines
Deal found 7/27![Alaska Airlines logo]()
$357
This Delta deal was found by Cheapflights users on 7/23. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Delta is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 11/246:40 pm
PHL
- SEA
1 stop8h 31m
Delta
Thu 12/105:45 am
SEA
- PHL
1 stop8h 55m
Delta
Deal found 7/23![Delta logo]()
$359
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 9/305:45 pm
IAD
- SEA
Nonstop5h 52m
United Airlines
Thu 10/110:42 am
SEA
- IAD
1 stop9h 10m
United Airlines
Deal found 7/23![United Airlines logo]()
$361
Last-minute flights from Pennsylvania to SeattleDiscover last-minute flight deals from Pennsylvania to Seattle. Data last updated July 29, 2026 and is based on user searches.
Discover last-minute flight deals from Pennsylvania to Seattle. Data last updated July 29, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 7/24. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 8/139:50 am
IAD
- SEA
1 stop28h 14m
Frontier
Tue 8/188:53 pm
SEA
- IAD
1 stop32h 11m
Frontier
Deal found 7/24![Frontier logo]()
$292
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/179:50 am
IAD
- SEA
1 stop27h 49m
Frontier
Wed 8/267:06 pm
SEA
- IAD
2 stops19h 08m
Frontier
Deal found 7/27![Frontier logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 8/189:13 am
IAD
- SEA
1 stop28h 26m
Frontier
Wed 8/262:37 pm
SEA
- IAD
2 stops18h 06m
Frontier
Deal found 7/27![Frontier logo]()
$290
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 8/189:13 am
IAD
- SEA
1 stop28h 26m
Frontier
Fri 8/211:35 pm
SEA
- IAD
2 stops15h 29m
Frontier
Deal found 7/27![Frontier logo]()
$291
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 8/189:13 am
IAD
- SEA
1 stop28h 26m
Frontier
Mon 8/249:29 pm
SEA
- IAD
2 stops16h 45m
Frontier
Deal found 7/27![Frontier logo]()
$294
This Super.com deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Super.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 8/198:59 am
IAD
- SEA
1 stop28h 40m
Frontier
Wed 8/268:53 pm
SEA
- IAD
1 stop8h 11m
Frontier
Deal found 7/28![Frontier logo]()
$287
This CheapOair deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure CheapOair is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 8/192:25 pm
DCA
- SEA
1 stop11h 28m
Multiple Airlines
Sat 8/227:06 pm
SEA
- DCA
1 stop14h 45m
Multiple Airlines
Deal found 7/28![Multiple Airlines logo]()
$290
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 8/208:59 am
IAD
- SEA
1 stop28h 40m
Frontier
Mon 8/249:29 pm
SEA
- IAD
2 stops22h 23m
Frontier
Deal found 7/27![Frontier logo]()
$293
This Kiwi.com deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/247:00 am
ABE
- SEA
1 stop29h 19m
Multiple Airlines
Wed 8/267:06 pm
SEA
- ABE
2 stops23h 01m
Multiple Airlines
Deal found 7/28![Multiple Airlines logo]()
$269
This WAYA deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure WAYA is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 8/255:47 pm
IAD
- SEA
Nonstop5h 47m
Multiple Airlines
Tue 9/18:48 pm
SEA
- IAD
1 stop8h 16m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$295
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 8/268:59 am
IAD
- SEA
1 stop28h 40m
Frontier
Wed 9/27:06 pm
SEA
- IAD
2 stops19h 08m
Frontier
Deal found 7/27![Frontier logo]()
$288
This Kiwi.com deal was found by Cheapflights users on 7/24. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sun 8/308:00 am
DCA
- SEA
Nonstop5h 54m
Multiple Airlines
Wed 9/94:27 pm
SEA
- DCA
1 stop16h 44m
Multiple Airlines
Deal found 7/24![Multiple Airlines logo]()
$293
One-way flights from Pennsylvania to SeattleSearch for one-way flight options from Pennsylvania to Seattle. Find affordable one-way fares based on user searches. Data last updated July 29, 2026.
Search for one-way flight options from Pennsylvania to Seattle. Find affordable one-way fares based on user searches. Data last updated July 29, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/247:00 am
ABE
- SEA
1 stop29h 19m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$119
This United Airlines deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/106:16 pm
PIT
- SEA
1 stop7h 40m
United Airlines
Deal found 7/27![United Airlines logo]()
$124
This Southwest deal was found by Cheapflights users on 7/26. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Southwest is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 8/251:25 pm
PIT
- SEA
2 stops9h 50m
Southwest
Deal found 7/26![Southwest logo]()
$129
This American Airlines deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure American Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 9/284:06 pm
PIT
- SEA
1 stop8h 30m
American Airlines
Deal found 7/28![American Airlines logo]()
$134
This Southwest deal was found by Cheapflights users on 7/24. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Southwest is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Mon 8/2412:50 pm
PIT
- SEA
2 stops13h 05m
Southwest
Deal found 7/24![Southwest logo]()
$144
This United Airlines deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 8/56:16 pm
PIT
- SEA
1 stop8h 00m
United Airlines
Deal found 7/28![United Airlines logo]()
$154
This United Airlines deal was found by Cheapflights users on 7/25. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure United Airlines is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Thu 10/85:11 am
PIT
- SEA
1 stop7h 25m
United Airlines
Deal found 7/25![United Airlines logo]()
$156
This Southwest deal was found by Cheapflights users on 7/27. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Southwest is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 9/261:55 pm
PIT
- SEA
2 stops10h 35m
Southwest
Deal found 7/27![Southwest logo]()
$157
This Southwest deal was found by Cheapflights users on 7/24. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Southwest is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Wed 8/121:25 pm
PIT
- SEA
2 stops9h 50m
Southwest
Deal found 7/24![Southwest logo]()
$159
This JetBlue deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure JetBlue is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 8/2512:53 pm
PIT
- SEA
1 stop13h 00m
JetBlue
Deal found 7/28![JetBlue logo]()
$162
This JetBlue deal was found by Cheapflights users on 7/28. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure JetBlue is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Sat 9/261:18 pm
PIT
- SEA
1 stop12h 19m
JetBlue
Deal found 7/28![JetBlue logo]()
$163
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the āPick Datesā button in this card will allow you to select your dates and further customize your flight criteria. From there, click āFind dealsā, make sure Kiwi.com is selected, and click āCompare selectedā under the list of providers to see comparable flight deals.
Tue 10/2712:43 pm
PHL
- SEA
2 stops24h 08m
Frontier
Deal found 7/26![Frontier logo]()
$165
Find flight deals from Pennsylvania to Seattle
Keep the following information in mind while searching for Pennsylvania to Seattle flight deals. Data was last updated July 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $269 (Kiwi.com) |
One-way from | $124 (United Airlines) |
Popular in | June |
Cheapest in | January |
Average price | $463 |
Good round-trip deal | $387 or less |
Good one-way deal | $213 or less |
Cheapflights Fare Finder
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Customize your flight search to find flights from Pennsylvania to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 29, 2026.
Use the filters below to find and compare flights from Pennsylvania to Seattle that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Wed 9/9
7:35 pm-9:20 am
1 stop16h 45m
Seattle/Tacoma Intl
Wed 9/16
9:35 pm-5:40 am
Nonstop5h 05m
$300
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Sat 9/5
7:35 pm-9:20 am
1 stop16h 45m
Seattle/Tacoma Intl
Mon 9/14
9:35 pm-5:40 am
Nonstop5h 05m
$300
Washington, D.C.Seattle
DCA - SEA
DCASEA
Washington, D.C. Reagan-National
Wed 8/26
8:00 am-10:54 am
Nonstop5h 54m
Seattle/Tacoma Intl
Wed 9/2
8:00 am-4:20 pm
Nonstop5h 20m
$305
PittsburghSeattle
PIT - SEA
PITSEA
Pittsburgh
Thu 10/15
12:00 pm-10:30 pm
2 stops13h 30m
Seattle/Tacoma Intl
Mon 10/19
9:15 pm-10:15 am
2 stops10h 00m
$312
PittsburghSeattle
PIT - SEA
PITSEA
Pittsburgh
Fri 9/4
6:30 pm-12:45 am
1 stop9h 15m
Seattle/Tacoma Intl
Fri 9/11
5:15 am-3:30 pm
1 stop7h 15m
$328
Washington, D.C.Seattle
DCA - SEA
DCASEA
Washington, D.C. Reagan-National
Wed 8/26
3:50 pm-11:05 pm
2 stops10h 15m
Seattle/Tacoma Intl
Wed 9/2
8:55 am-10:20 pm
1 stop10h 25m
$330
Washington, D.C.Seattle
DCA - SEA
DCASEA
Washington, D.C. Reagan-National
Thu 9/10
4:35 pm-11:55 pm
2 stops10h 20m
Seattle/Tacoma Intl
Thu 9/17
11:05 pm-11:50 am
1 stop9h 45m
$330
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Fri 12/11
6:51 pm-12:14 am
1 stop8h 23m
Seattle/Tacoma Intl
Mon 12/14
7:32 pm-7:45 am
1 stop9h 13m
$335
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Fri 8/21
6:00 pm-8:45 pm
Nonstop5h 45m
Seattle/Tacoma Intl
Fri 8/28
11:59 pm-11:28 am
1 stop8h 29m
$338
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Sun 10/4
7:05 am-9:56 am
Nonstop5h 51m
Seattle/Tacoma Intl
Sun 10/11
9:29 pm-5:37 am
Nonstop5h 08m
$339
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Pennsylvania to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from Pennsylvania with our price prediction graph.
ABE-SEA
DCA-SEA
IAD-SEA
PIT-SEA
PHL-SEA
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 Pennsylvania to Seattle
USPA-SEA
ABE-SEA
DCA-SEA
IAD-SEA
PIT-SEA
What is the cheapest month to book a flight from Pennsylvania to Seattle?
Currently, January is the cheapest month in which you can book a flight from Pennsylvania to Seattle (average of $306). Flying from Pennsylvania to Seattle in July is currently the most expensive (average of $477). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from PA to SEA?
Find hourly flight availability from Pennsylvania to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 29, 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Pennsylvania to Seattle as you normally would.
Weekly flight availability from Pennsylvania to Seattle
Explore weekly flight availability from Pennsylvania to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 29, 2026.
The most flights from USPA to SEA are scheduled on a Tuesday (9 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (4 on average).
How much does it cost to fly round-trip from Pennsylvania to Seattle?
Airfare is below average for this route at the moment.
Pennsylvania to Seattle flights typically cost between $358 and $556 in August.The cheapest round-trip price found within the last 5 days was $329 on Frontier (Aug 16-Aug 29).
How far ahead should I book a flight from Pennsylvania to Seattle?
To ensure you get the cheapest price possible for a flight from Pennsylvania to Seattle, you should look to book at least 60 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
Related info for your journey
Find useful and relevant information for your journey from Pennsylvania to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsSeaTac
Renton
Tacoma
Lacey
Leavenworth
Olympia
Edmonds
Tukwila
Snoqualmie
Tumwater
Centralia
Puyallup
Kent
Ellensburg
Fife
Marysville
Ocean Shores
Lakewood
Lynnwood
Shoreline
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Pennsylvania to Seattle
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Seattle by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Pennsylvania to Seattle by cabin class
Find flights from Pennsylvania to Seattle, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Pennsylvania and Seattle flights
Browse other Pennsylvania and Seattle flight options. Last updated on July 29, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Seattle
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on July 29, 2026.
Pennsylvania to Seattle flights
Consider these flights traveling from Pennsylvania to Seattle.
Top 7 airlines flying from Pennsylvania to Seattle
Discover the top 7 airlines that operate flights from Pennsylvania to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$134 | Average$288 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$138 | Average$357 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$159 | Average$366 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$163 | Average$402 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$168 | Average$516 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$197 | Average$512 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$234 | Average$439 | FlexibilityNo cancel fee | On-time69% |