$85+ 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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SEA
Jul 12 — Jul 191
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 June 12, 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 June 12, 2026.
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.
Thu 9/176:54 pm
MDT
- SEA
1 stop8h 17m
American Airlines
Tue 9/226:18 am
SEA
- MDT
1 stop8h 55m
American Airlines
Deal found 6/9![American Airlines logo]()
$287
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.
Tue 7/75:05 pm
PIT
- SEA
1 stop8h 51m
American Airlines
Tue 7/145:05 am
SEA
- PIT
1 stop10h 38m
American Airlines
Deal found 6/9![American Airlines logo]()
$299
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.
Fri 8/282:54 pm
PIT
- SEA
1 stop10h 32m
American Airlines
Sat 9/55:15 am
SEA
- PIT
1 stop8h 23m
American Airlines
Deal found 6/8![American Airlines logo]()
$301
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.
Sat 7/182:45 pm
PIT
- SEA
1 stop12h 25m
Southwest
Fri 7/246:30 am
SEA
- PIT
1 stop14h 25m
Southwest
Deal found 6/10![Southwest logo]()
$303
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/106:35 pm
PIT
- SEA
1 stop7h 20m
Southwest
Fri 8/146:15 am
SEA
- PIT
2 stops12h 35m
Southwest
Deal found 6/11![Southwest logo]()
$304
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.
Tue 8/46:30 pm
PIT
- SEA
1 stop7h 35m
Southwest
Fri 8/146:15 am
SEA
- PIT
1 stop13h 00m
Southwest
Deal found 6/9![Southwest logo]()
$305
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/121:25 pm
PIT
- SEA
1 stop10h 50m
Southwest
Sat 8/225:00 am
SEA
- PIT
1 stop7h 30m
Southwest
Deal found 6/11![Southwest logo]()
$306
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.
Fri 10/3012:30 pm
MDT
- SEA
1 stop9h 08m
Delta
Mon 11/211:05 pm
SEA
- MDT
1 stop9h 48m
Delta
Deal found 6/7![Delta logo]()
$307
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.
Mon 6/295:11 pm
PIT
- SEA
1 stop8h 47m
American Airlines
Wed 7/110:23 am
SEA
- PIT
1 stop10h 34m
American Airlines
Deal found 6/11![American Airlines logo]()
$308
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.
Sat 10/246:03 am
PIT
- SEA
1 stop8h 37m
American Airlines
Sat 10/315:05 am
SEA
- PIT
1 stop10h 41m
American Airlines
Deal found 6/10![American Airlines logo]()
$309
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/114:50 pm
PIT
- SEA
1 stop11h 25m
Southwest
Fri 7/176:30 am
SEA
- PIT
1 stop14h 25m
Southwest
Deal found 6/11![Southwest logo]()
$310
This Southwest deal was found by Cheapflights users on 6/12. 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 8/2412:50 pm
PIT
- SEA
2 stops13h 05m
Southwest
Wed 9/25:20 am
SEA
- PIT
2 stops9h 15m
Southwest
Deal found 6/12![Southwest logo]()
$311
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 June 12, 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 June 12, 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.
Tue 11/312:30 pm
MDT
- SEA
1 stop9h 08m
Delta
Mon 11/911:05 pm
SEA
- MDT
1 stop9h 48m
Delta
Deal found 6/7![Delta logo]()
$307
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.
Fri 9/185:54 pm
MDT
- SEA
1 stop7h 51m
United Airlines
Tue 9/2211:00 pm
SEA
- MDT
1 stop8h 05m
United Airlines
Deal found 6/8![United Airlines logo]()
$307
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/106:40 pm
PIT
- SEA
2 stops10h 05m
Southwest
Tue 7/1411:05 pm
SEA
- PIT
1 stop8h 15m
Southwest
Deal found 6/11![Southwest logo]()
$317
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/277:35 pm
IAD
- SEA
1 stop16h 45m
Alaska Airlines
Sat 9/59:35 pm
SEA
- IAD
Nonstop5h 05m
Alaska Airlines
Deal found 6/11![Alaska Airlines logo]()
$325
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.
Thu 8/277:10 am
IAD
- SEA
Nonstop5h 45m
Delta
Sat 9/53:58 pm
SEA
- IAD
Nonstop5h 01m
Delta
Deal found 6/7![Delta logo]()
$326
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.
Tue 9/13:15 pm
LGA
- SEA
2 stops10h 50m
Southwest
Fri 9/117:00 am
SEA
- LGA
2 stops10h 55m
Southwest
Deal found 6/9![Southwest logo]()
$334
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/224:48 pm
PHL
- SEA
1 stop8h 51m
Alaska Airlines
Tue 9/19:27 pm
SEA
- PHL
Nonstop5h 13m
Alaska Airlines
Deal found 6/11![Alaska Airlines logo]()
$339
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:44 pm
EWR
- SEA
Nonstop6h 11m
United Airlines
Mon 10/2610:45 pm
SEA
- EWR
Nonstop5h 09m
United Airlines
Deal found 6/9![United Airlines logo]()
$343
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.
Mon 9/77:05 am
PHL
- SEA
Nonstop5h 56m
Delta
Tue 9/89:50 pm
SEA
- PHL
Nonstop5h 15m
Delta
Deal found 6/8![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.
Wed 8/264:35 pm
DCA
- SEA
1 stop10h 00m
Southwest
Thu 9/35:00 am
SEA
- DCA
2 stops12h 55m
Southwest
Deal found 6/9![Southwest logo]()
$336
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/166:14 pm
IAD
- SEA
Nonstop5h 55m
Alaska Airlines
Mon 8/249:35 pm
SEA
- IAD
Nonstop5h 05m
Alaska Airlines
Deal found 6/8![Alaska Airlines logo]()
$340
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.
Tue 8/257:00 am
PIT
- SEA
2 stops12h 14m
United Airlines
Tue 9/15:20 pm
SEA
- PIT
2 stops13h 29m
United Airlines
Deal found 6/8![United Airlines logo]()
$357
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.
Thu 10/17:05 am
PHL
- SEA
Nonstop5h 51m
Delta
Thu 10/89:50 pm
SEA
- PHL
Nonstop5h 13m
Delta
Deal found 6/7![Delta logo]()
$329
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.
Thu 8/136:30 pm
PIT
- SEA
1 stop9h 10m
Southwest
Tue 8/187:10 am
SEA
- PIT
2 stops10h 35m
Southwest
Deal found 6/7![Southwest logo]()
$338
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/97:00 am
IAD
- SEA
Nonstop5h 37m
Alaska Airlines
Sun 9/139:35 pm
SEA
- IAD
Nonstop5h 05m
Alaska Airlines
Deal found 6/9![Alaska Airlines logo]()
$340
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.
Fri 11/612:30 pm
MDT
- SEA
1 stop9h 08m
Delta
Mon 11/911:05 pm
SEA
- MDT
1 stop9h 48m
Delta
Deal found 6/7![Delta logo]()
$333
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.
Wed 8/121:25 pm
PIT
- SEA
1 stop10h 50m
Southwest
Sun 8/165:55 am
SEA
- PIT
2 stops16h 40m
Southwest
Deal found 6/7![Southwest logo]()
$338
This United Airlines deal was found by Cheapflights users on 6/12. 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.
Tue 9/292:50 pm
SCE
- SEA
2 stops11h 06m
United Airlines
Sat 10/311:13 pm
SEA
- SCE
1 stop7h 39m
United Airlines
Deal found 6/12![United Airlines logo]()
$374
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/284:48 pm
PHL
- SEA
1 stop8h 51m
Alaska Airlines
Sun 8/308:59 pm
SEA
- PHL
1 stop15h 46m
Alaska Airlines
Deal found 6/11![Alaska Airlines logo]()
$349
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.
Thu 8/207:05 am
PHL
- SEA
Nonstop5h 56m
Delta
Thu 8/276:09 pm
SEA
- PHL
1 stop8h 56m
Delta
Deal found 6/10![Delta logo]()
$339
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/261:25 pm
LGA
- SEA
2 stops10h 50m
United Airlines
Wed 9/308:46 am
SEA
- LGA
2 stops11h 24m
United Airlines
Deal found 6/11![United Airlines logo]()
$374
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.
Sun 9/136:20 am
PHL
- SEA
1 stop9h 55m
Southwest
Sat 9/195:00 am
SEA
- PHL
2 stops12h 45m
Southwest
Deal found 6/8![Southwest logo]()
$341
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/48:12 pm
JFK
- SEA
Nonstop6h 17m
Alaska Airlines
Sat 9/127:08 am
SEA
- JFK
1 stop9h 19m
Alaska Airlines
Deal found 6/9![Alaska Airlines logo]()
$356
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.
Wed 9/26:05 am
PHL
- SEA
1 stop7h 26m
Delta
Wed 9/99:50 pm
SEA
- PHL
Nonstop5h 15m
Delta
Deal found 6/7![Delta logo]()
$339
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/235:27 pm
LGA
- SEA
1 stop8h 29m
United Airlines
Sun 10/2510:40 pm
SEA
- LGA
1 stop7h 32m
United Airlines
Deal found 6/11![United Airlines logo]()
$382
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.
Wed 8/197:55 am
PHL
- SEA
2 stops10h 35m
Southwest
Tue 8/257:10 am
SEA
- PHL
2 stops10h 25m
Southwest
Deal found 6/8![Southwest logo]()
$359
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/156:03 am
IAD
- SEA
Nonstop5h 45m
Alaska Airlines
Sun 8/238:49 pm
SEA
- IAD
1 stop18h 25m
Alaska Airlines
Deal found 6/9![Alaska Airlines logo]()
$360
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.
Fri 7/36:45 pm
PHL
- SEA
Nonstop6h 14m
Delta
Tue 7/72:30 pm
SEA
- PHL
1 stop6h 26m
Delta
Deal found 6/7![Delta logo]()
$339
This United Airlines deal was found by Cheapflights users on 6/12. 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 8/1212:57 pm
DCA
- SEA
1 stop9h 11m
United Airlines
Thu 8/207:00 am
SEA
- DCA
1 stop11h 05m
United Airlines
Deal found 6/12![United Airlines logo]()
$385
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.
Mon 8/246:10 am
LGA
- SEA
2 stops13h 55m
Southwest
Tue 9/16:40 am
SEA
- LGA
2 stops10h 45m
Southwest
Deal found 6/8![Southwest logo]()
$364
Last-minute flights from Pennsylvania to SeattleDiscover last-minute flight deals from Pennsylvania to Seattle. Data last updated June 12, 2026 and is based on user searches.
Discover last-minute flight deals from Pennsylvania to Seattle. Data last updated June 12, 2026 and is based on user searches.
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.
Mon 6/155:37 am
PIT
- SEA
1 stop9h 09m
American Airlines
Tue 7/145:05 am
SEA
- PIT
1 stop10h 38m
American Airlines
Deal found 6/9![American Airlines logo]()
$313
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/232:51 pm
LGA
- SEA
1 stop8h 55m
United Airlines
Wed 6/2411:20 pm
SEA
- LGA
1 stop7h 28m
United Airlines
Deal found 6/9![United Airlines logo]()
$317
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.
Mon 6/295:11 pm
PIT
- SEA
1 stop8h 47m
American Airlines
Mon 7/610:35 pm
SEA
- PIT
1 stop10h 30m
American Airlines
Deal found 6/10![American Airlines logo]()
$308
This Southwest deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/44:15 pm
PIT
- SEA
1 stop9h 05m
Southwest
Tue 7/77:30 pm
SEA
- PIT
2 stops13h 35m
Southwest
Deal found 6/12![Southwest logo]()
$316
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.
Tue 7/75:05 pm
PIT
- SEA
1 stop8h 51m
American Airlines
Tue 7/145:05 am
SEA
- PIT
1 stop10h 38m
American Airlines
Deal found 6/9![American Airlines logo]()
$299
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.
Tue 7/75:30 pm
PIT
- SEA
1 stop10h 15m
Southwest
Tue 7/1411:05 pm
SEA
- PIT
2 stops10h 00m
Southwest
Deal found 6/9![Southwest logo]()
$314
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/106:40 pm
PIT
- SEA
2 stops10h 05m
Southwest
Tue 7/1411:05 pm
SEA
- PIT
1 stop8h 15m
Southwest
Deal found 6/11![Southwest logo]()
$317
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/114:50 pm
PIT
- SEA
1 stop11h 25m
Southwest
Fri 7/176:30 am
SEA
- PIT
1 stop14h 25m
Southwest
Deal found 6/11![Southwest logo]()
$310
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.
Tue 7/143:55 pm
PIT
- SEA
2 stops10h 40m
Southwest
Tue 7/216:15 am
SEA
- PIT
1 stop9h 00m
Southwest
Deal found 6/8![Southwest logo]()
$320
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.
Sat 7/182:45 pm
PIT
- SEA
1 stop12h 25m
Southwest
Fri 7/246:30 am
SEA
- PIT
1 stop14h 25m
Southwest
Deal found 6/10![Southwest logo]()
$303
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.
Tue 7/215:30 pm
PIT
- SEA
1 stop10h 15m
Southwest
Fri 7/245:30 am
SEA
- PIT
2 stops11h 00m
Southwest
Deal found 6/8![Southwest logo]()
$318
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.
Wed 7/227:23 am
LGA
- SEA
1 stop10h 04m
American Airlines
Tue 8/49:35 pm
SEA
- LGA
1 stop7h 50m
American Airlines
Deal found 6/8![American Airlines logo]()
$320
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 June 12, 2026.
Search for one-way flight options from Pennsylvania to Seattle. Find affordable one-way fares based on user searches. Data last updated June 12, 2026.
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/96:30 pm
PIT
- SEA
1 stop7h 35m
Southwest
Deal found 6/11![Southwest logo]()
$85
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:55 pm
PIT
- SEA
1 stop7h 40m
Southwest
Deal found 6/11![Southwest logo]()
$95
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.
Tue 9/11:25 pm
PIT
- SEA
2 stops9h 50m
Southwest
Deal found 6/10![Southwest logo]()
$101
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.
Sat 8/291:20 pm
PIT
- SEA
1 stop9h 10m
Southwest
Deal found 6/10![Southwest logo]()
$109
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.
Mon 8/245:48 pm
PIT
- SEA
1 stop8h 38m
United Airlines
Deal found 6/10![United Airlines logo]()
$115
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/172:54 pm
ABE
- SEA
1 stop21h 54m
Multiple Airlines
Deal found 6/9![Multiple Airlines logo]()
$115
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.
Tue 7/147:36 pm
PIT
- SEA
1 stop8h 21m
American Airlines
Deal found 6/11![American Airlines logo]()
$119
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.
Sat 7/48:55 am
PIT
- SEA
2 stops10h 00m
Southwest
Deal found 6/7![Southwest logo]()
$124
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/63:37 pm
PIT
- SEA
1 stop9h 04m
United Airlines
Deal found 6/9![United Airlines logo]()
$125
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.
Mon 9/77:30 pm
PIT
- SEA
1 stop7h 00m
Southwest
Deal found 6/10![Southwest logo]()
$126
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.
Mon 8/175:50 am
PIT
- SEA
2 stops10h 00m
Southwest
Deal found 6/10![Southwest logo]()
$131
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.
Tue 8/45:05 pm
PIT
- SEA
1 stop8h 51m
American Airlines
Deal found 6/10![American Airlines logo]()
$140
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 June 12, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $287 (American Airlines) |
One-way from | $85 (Southwest) |
Popular in | December |
Cheapest in | October |
Average price | $472 |
Good round-trip deal | $355 or less |
Good one-way deal | $195 or less |
Cheapflights Fare Finder
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 June 12, 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
HarrisburgSeattle
MDT - SEA
MDTSEA
Harrisburg
Tue 11/3
12:30 pm-6:38 pm
1 stop9h 08m
Seattle/Tacoma Intl
Mon 11/9
11:05 pm-11:53 am
1 stop9h 48m
$307
HarrisburgSeattle
MDT - SEA
MDTSEA
Harrisburg
Fri 9/18
5:54 pm-10:45 pm
1 stop7h 51m
Seattle/Tacoma Intl
Tue 9/22
11:00 pm-10:05 am
1 stop8h 05m
$307
PittsburghSeattle
PIT - SEA
PITSEA
Pittsburgh
Fri 7/10
6:40 pm-1:45 am
2 stops10h 05m
Seattle/Tacoma Intl
Tue 7/14
11:05 pm-10:20 am
1 stop8h 15m
$317
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Thu 8/27
7:35 pm-9:20 am
1 stop16h 45m
Seattle/Tacoma Intl
Sat 9/5
9:35 pm-5:40 am
Nonstop5h 05m
$325
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Thu 8/27
7:10 am-9:55 am
Nonstop5h 45m
Seattle/Tacoma Intl
Sat 9/5
3:58 pm-11:59 pm
Nonstop5h 01m
$326
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Mon 9/7
7:05 am-10:01 am
Nonstop5h 56m
Seattle/Tacoma Intl
Tue 9/8
9:50 pm-6:05 am
Nonstop5h 15m
$329
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Thu 10/1
7:05 am-9:56 am
Nonstop5h 51m
Seattle/Tacoma Intl
Thu 10/8
9:50 pm-6:03 am
Nonstop5h 13m
$329
HarrisburgSeattle
MDT - SEA
MDTSEA
Harrisburg
Fri 11/6
12:30 pm-6:38 pm
1 stop9h 08m
Seattle/Tacoma Intl
Mon 11/9
11:05 pm-11:53 am
1 stop9h 48m
$333
New YorkSeattle
LGA - SEA
LGASEA
New York LaGuardia
Tue 9/1
3:15 pm-11:05 pm
2 stops10h 50m
Seattle/Tacoma Intl
Fri 9/11
7:00 am-8:55 pm
2 stops10h 55m
$334
Washington, D.C.Seattle
DCA - SEA
DCASEA
Washington, D.C. Reagan-National
Wed 8/26
4:35 pm-11:35 pm
1 stop10h 00m
Seattle/Tacoma Intl
Thu 9/3
5:00 am-8:55 pm
2 stops12h 55m
$336
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.
MDT-SEA
PIT-SEA
PHL-SEA
IAD-SEA
ABE-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
MDT-SEA
PIT-SEA
PHL-SEA
IAD-SEA
What is the cheapest month to book a flight from Pennsylvania to Seattle?
Currently, November is the cheapest month in which you can book a flight from Pennsylvania to Seattle (average of $98). Flying from Pennsylvania to Seattle in July is currently the most expensive (average of $474). 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 June 12, 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 June 12, 2026.
The most flights from USPA to SEA are scheduled on a Friday (9 on average). You will have fewer flight options on Saturday, 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?
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 66 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
Tacoma
Lacey
Ocean Shores
Leavenworth
Olympia
Edmonds
Snoqualmie
Tumwater
Tukwila
Puyallup
Kent
Lynnwood
Renton
Ellensburg
Fife
Lakewood
Issaquah
Marysville
Shoreline
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
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Seattle flight routes
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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 June 12, 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 June 12, 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 June 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$119 | Average$361 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$134 | Average$298 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$148 | Average$400 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$166 | Average$383 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$178 | Average$522 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$197 | Average$502 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$231 | Average$440 | FlexibilityNo cancel fee | On-time69% |