$156+ Cheap flights from Pennsylvania to Washington
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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SEA
Sep 3 — Sep 101
Round-trip
1 adult, Economy
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Cheapest flights from Pennsylvania to WashingtonExplore the most affordable flight options available from Pennsylvania to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 4, 2026.
Explore the most affordable flight options available from Pennsylvania to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 4, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/28:59 am
IAD
- SEA
1 stop28h 40m
Frontier
Wed 9/97:25 pm
SEA
- IAD
2 stops13h 08m
Frontier
Deal found 8/3![Frontier logo]()
$283
This Kiwi.com deal was found by Cheapflights users on 7/31. 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 8/315:00 pm
DCA
- SEA
Nonstop5h 51m
Multiple Airlines
Thu 9/104:27 pm
SEA
- DCA
1 stop16h 44m
Multiple Airlines
Deal found 7/31![Multiple Airlines logo]()
$283
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/248:59 am
IAD
- SEA
1 stop28h 40m
Frontier
Tue 9/88:48 pm
SEA
- IAD
2 stops24h 22m
Frontier
Deal found 8/2![Frontier logo]()
$284
This Kiwi.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/15:00 pm
DCA
- SEA
Nonstop5h 51m
Multiple Airlines
Sat 9/124:27 pm
SEA
- DCA
1 stop16h 44m
Multiple Airlines
Deal found 7/31![Multiple Airlines logo]()
$284
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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.
Mon 8/249:03 am
IAD
- SEA
Nonstop5h 36m
Alaska Airlines
Tue 9/18:38 am
SEA
- IAD
Nonstop5h 06m
Alaska Airlines
Deal found 7/30![Alaska Airlines logo]()
$285
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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.
Tue 9/155:00 pm
DCA
- SEA
Nonstop5h 51m
Alaska Airlines
Wed 9/231:46 pm
SEA
- DCA
Nonstop5h 13m
Alaska Airlines
Deal found 7/30![Alaska Airlines logo]()
$285
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 8/248:59 am
IAD
- SEA
1 stop28h 40m
Frontier
Thu 9/34:33 pm
SEA
- IAD
1 stop12h 31m
Frontier
Deal found 7/30![Frontier logo]()
$286
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/287:00 am
DCA
- SEA
1 stop8h 20m
Multiple Airlines
Wed 9/21:46 pm
SEA
- DCA
Nonstop5h 13m
Multiple Airlines
Deal found 8/2![Multiple Airlines logo]()
$286
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/228:59 am
IAD
- SEA
2 stops13h 39m
Frontier
Wed 8/268:53 pm
SEA
- IAD
1 stop8h 11m
Frontier
Deal found 7/30![Frontier logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/231:59 pm
DCA
- SEA
1 stop22h 20m
Frontier
Thu 8/272:37 pm
SEA
- DCA
1 stop19h 14m
Frontier
Deal found 8/3![Frontier logo]()
$287
This CheapOair deal was found by Cheapflights users on 7/30. 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.
Sat 9/58:59 am
IAD
- SEA
1 stop28h 40m
Frontier
Mon 9/79:36 pm
SEA
- IAD
1 stop28h 25m
Frontier
Deal found 7/30![Frontier logo]()
$288
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:00 pm
DCA
- SEA
2 stops29h 02m
Frontier
Tue 8/257:06 pm
SEA
- DCA
1 stop14h 45m
Frontier
Deal found 7/30![Frontier logo]()
$288
Best flights from Pennsylvania to WashingtonDiscover carefully curated flight deals from Pennsylvania to Washington that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 4, 2026.
Discover carefully curated flight deals from Pennsylvania to Washington that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 4, 2026.
This Alaska Airlines deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/257:00 am
IAD
- SEA
Nonstop5h 37m
Alaska Airlines
Mon 9/289:35 pm
SEA
- IAD
Nonstop5h 05m
Alaska Airlines
Deal found 8/2![Alaska Airlines logo]()
$285
This United Airlines deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/25:15 pm
IAD
- SEA
1 stop8h 28m
United Airlines
Wed 9/911:04 pm
SEA
- IAD
Nonstop5h 05m
United Airlines
Deal found 8/1![United Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 7/29. 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 9/144:35 pm
DCA
- SEA
2 stops10h 20m
Southwest
Thu 9/175:15 am
SEA
- DCA
1 stop6h 35m
Southwest
Deal found 7/29![Southwest logo]()
$310
This Delta deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/14:35 pm
DCA
- SEA
Nonstop6h 06m
Delta
Sat 9/127:20 am
SEA
- DCA
Nonstop5h 12m
Delta
Deal found 8/1![Delta logo]()
$335
This JetBlue deal was found by Cheapflights users on 7/30. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/123:30 pm
JFK
- SEA
1 stop10h 07m
JetBlue
Sat 9/199:40 pm
SEA
- JFK
Nonstop5h 24m
JetBlue
Deal found 7/30![JetBlue logo]()
$370
This KAYAK deal was found by Cheapflights users on 7/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/106:55 am
EWR
- SEA
1 stop10h 18m
American Airlines
Thu 10/156:12 am
SEA
- EWR
1 stop7h 26m
American Airlines
Deal found 7/29![American Airlines logo]()
$391
This Sun Country Air deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2412:44 pm
IAD
- PDX
1 stop24h 09m
Sun Country Air
Sat 11/2811:59 pm
PDX
- IAD
1 stop7h 01m
Sun Country Air
Deal found 8/2![Sun Country Air logo]()
$535
This Alaska Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/207:00 am
IAD
- SEA
Nonstop5h 37m
Alaska Airlines
Sat 9/268:30 am
SEA
- IAD
Nonstop5h 13m
Alaska Airlines
Deal found 8/3![Alaska Airlines logo]()
$321
This United Airlines deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/111:30 pm
PHL
- SEA
1 stop8h 44m
United Airlines
Tue 9/157:00 am
SEA
- PHL
1 stop7h 54m
United Airlines
Deal found 8/1![United Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 7/31. 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 10/55:10 pm
PHL
- SEA
2 stops10h 45m
Southwest
Tue 10/612:10 am
SEA
- PHL
1 stop7h 30m
Southwest
Deal found 7/31![Southwest logo]()
$352
This Delta deal was found by Cheapflights users on 7/31. 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 9/295:56 pm
JFK
- PDX
Nonstop6h 07m
Delta
Sat 10/37:10 am
PDX
- JFK
Nonstop5h 32m
Delta
Deal found 7/31![Delta logo]()
$357
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/111:30 pm
PHL
- SEA
1 stop8h 44m
United Airlines
Mon 9/1411:00 pm
SEA
- PHL
1 stop8h 02m
United Airlines
Deal found 8/3![United Airlines logo]()
$329
This Alaska Airlines deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/67:29 pm
EWR
- SEA
Nonstop6h 13m
Alaska Airlines
Sun 11/89:40 pm
SEA
- EWR
Nonstop5h 24m
Alaska Airlines
Deal found 8/2![Alaska Airlines logo]()
$349
This Delta deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/157:05 am
PHL
- SEA
Nonstop5h 51m
Delta
Wed 9/239:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Deal found 8/1![Delta logo]()
$359
This Southwest deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1110:20 am
PHL
- SEA
2 stops10h 15m
Southwest
Mon 9/148:25 pm
SEA
- PHL
2 stops12h 10m
Southwest
Deal found 8/3![Southwest logo]()
$373
This United Airlines deal was found by Cheapflights users on 7/30. 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 10/11:05 pm
IAD
- SEA
Nonstop5h 46m
United Airlines
Sun 10/48:25 am
SEA
- IAD
Nonstop5h 06m
United Airlines
Deal found 7/30![United Airlines logo]()
$347
This Alaska Airlines deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/159:30 am
EWR
- SEA
Nonstop6h 05m
Alaska Airlines
Mon 10/1910:40 pm
SEA
- EWR
Nonstop5h 19m
Alaska Airlines
Deal found 8/1![Alaska Airlines logo]()
$349
This KAYAK deal was found by Cheapflights users on 7/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/106:14 am
JFK
- SEA
1 stop9h 13m
American Airlines
Thu 10/156:00 am
SEA
- JFK
1 stop11h 04m
American Airlines
Deal found 7/29![American Airlines logo]()
$425
This Delta deal was found by Cheapflights users on 7/31. 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 11/1012:55 pm
EWR
- SEA
1 stop8h 37m
Delta
Thu 11/1211:15 pm
SEA
- EWR
1 stop6h 30m
Delta
Deal found 7/31![Delta logo]()
$367
This Southwest deal was found by Cheapflights users on 7/31. 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 10/136:25 am
PHL
- SEA
2 stops10h 55m
Southwest
Fri 10/169:15 pm
SEA
- PHL
2 stops10h 45m
Southwest
Deal found 7/31![Southwest logo]()
$373
This United Airlines deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/262:47 pm
IAD
- SEA
1 stop8h 56m
United Airlines
Sun 8/3011:04 pm
SEA
- IAD
Nonstop5h 03m
United Airlines
Deal found 8/1![United Airlines logo]()
$347
This Alaska Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/177:47 pm
IAD
- SEA
1 stop16h 33m
Alaska Airlines
Sun 9/203:56 pm
SEA
- IAD
Nonstop5h 03m
Alaska Airlines
Deal found 8/3![Alaska Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/26:05 am
PHL
- SEA
1 stop7h 26m
Delta
Wed 9/99:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Deal found 8/1![Delta logo]()
$369
This Southwest deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/298:20 am
LGA
- SEA
1 stop9h 35m
Southwest
Mon 8/3111:00 pm
SEA
- LGA
1 stop11h 05m
Southwest
Deal found 8/1![Southwest logo]()
$381
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/286:00 pm
IAD
- SEA
Nonstop5h 45m
United Airlines
Mon 8/3111:00 pm
SEA
- IAD
1 stop7h 28m
United Airlines
Deal found 8/3![United Airlines logo]()
$347
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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 10/86:41 pm
PHL
- SEA
Nonstop6h 00m
Alaska Airlines
Mon 10/129:19 am
SEA
- PHL
Nonstop5h 19m
Alaska Airlines
Deal found 7/30![Alaska Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:00 am
EWR
- PDX
1 stop7h 36m
Delta
Mon 11/1611:20 pm
PDX
- EWR
1 stop6h 25m
Delta
Deal found 8/3![Delta logo]()
$372
This Southwest deal was found by Cheapflights users on 7/29. 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 9/232:30 pm
LGA
- SEA
2 stops11h 40m
Southwest
Mon 10/512:10 am
SEA
- LGA
1 stop9h 40m
Southwest
Deal found 7/29![Southwest logo]()
$382
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2011:25 am
EWR
- SEA
Nonstop6h 03m
United Airlines
Wed 9/3011:13 pm
SEA
- EWR
1 stop8h 35m
United Airlines
Deal found 8/3![United Airlines logo]()
$353
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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.
Tue 9/299:30 am
DCA
- SEA
1 stop12h 03m
Alaska Airlines
Wed 9/301:46 pm
SEA
- DCA
Nonstop5h 13m
Alaska Airlines
Deal found 7/30![Alaska Airlines logo]()
$361
Last-minute flights from Pennsylvania to WashingtonDiscover last-minute flight deals from Pennsylvania to Washington. Data last updated August 4, 2026 and is based on user searches.
Discover last-minute flight deals from Pennsylvania to Washington. Data last updated August 4, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:00 pm
DCA
- SEA
2 stops29h 02m
Frontier
Tue 8/257:06 pm
SEA
- DCA
1 stop14h 45m
Frontier
Deal found 7/30![Frontier logo]()
$288
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/228:59 am
IAD
- SEA
2 stops13h 39m
Frontier
Wed 8/268:53 pm
SEA
- IAD
1 stop8h 11m
Frontier
Deal found 7/30![Frontier logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/231:59 pm
DCA
- SEA
1 stop22h 20m
Frontier
Thu 8/272:37 pm
SEA
- DCA
1 stop19h 14m
Frontier
Deal found 8/3![Frontier logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/248:59 am
IAD
- SEA
1 stop28h 40m
Frontier
Tue 9/88:48 pm
SEA
- IAD
2 stops24h 22m
Frontier
Deal found 8/2![Frontier logo]()
$284
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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.
Mon 8/249:03 am
IAD
- SEA
Nonstop5h 36m
Alaska Airlines
Tue 9/18:38 am
SEA
- IAD
Nonstop5h 06m
Alaska Airlines
Deal found 7/30![Alaska Airlines logo]()
$285
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 8/248:59 am
IAD
- SEA
1 stop28h 40m
Frontier
Thu 9/34:33 pm
SEA
- IAD
1 stop12h 31m
Frontier
Deal found 7/30![Frontier logo]()
$286
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/287:00 am
DCA
- SEA
1 stop8h 20m
Multiple Airlines
Wed 9/21:46 pm
SEA
- DCA
Nonstop5h 13m
Multiple Airlines
Deal found 8/2![Multiple Airlines logo]()
$286
This Kiwi.com deal was found by Cheapflights users on 7/31. 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 8/315:00 pm
DCA
- SEA
Nonstop5h 51m
Multiple Airlines
Thu 9/104:27 pm
SEA
- DCA
1 stop16h 44m
Multiple Airlines
Deal found 7/31![Multiple Airlines logo]()
$283
This Kiwi.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/15:00 pm
DCA
- SEA
Nonstop5h 51m
Multiple Airlines
Sat 9/124:27 pm
SEA
- DCA
1 stop16h 44m
Multiple Airlines
Deal found 7/31![Multiple Airlines logo]()
$284
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/28:59 am
IAD
- SEA
1 stop28h 40m
Frontier
Wed 9/97:25 pm
SEA
- IAD
2 stops13h 08m
Frontier
Deal found 8/3![Frontier logo]()
$283
This CheapOair deal was found by Cheapflights users on 7/30. 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.
Sat 9/58:59 am
IAD
- SEA
1 stop28h 40m
Frontier
Mon 9/219:45 pm
SEA
- IAD
1 stop29h 35m
Frontier
Deal found 7/30![Frontier logo]()
$288
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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.
Tue 9/155:00 pm
DCA
- SEA
Nonstop5h 51m
Alaska Airlines
Wed 9/231:46 pm
SEA
- DCA
Nonstop5h 13m
Alaska Airlines
Deal found 7/30![Alaska Airlines logo]()
$285
One-way flights from Pennsylvania to WashingtonSearch for one-way flight options from Pennsylvania to Washington. Find affordable one-way fares based on user searches. Data last updated August 4, 2026.
Search for one-way flight options from Pennsylvania to Washington. Find affordable one-way fares based on user searches. Data last updated August 4, 2026.
This SmartFares deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:55 am
EWR
- PDX
Nonstop5h 53m
Alaska Airlines
Deal found 8/1![Alaska Airlines logo]()
$156
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/125:55 am
EWR
- PDX
2 stops32h 48m
Frontier
Deal found 7/30![Frontier logo]()
$158
This Trip.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/299:00 am
EWR
- PDX
1 stop10h 50m
Alaska Airlines
Deal found 7/31![Alaska Airlines logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/105:55 am
EWR
- PDX
2 stops32h 48m
Frontier
Deal found 8/3![Frontier logo]()
$163
This Kiwi.com deal was found by Cheapflights users on 7/31. 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 9/2812:40 pm
PHL
- SEA
2 stops29h 28m
Frontier
Deal found 7/31![Frontier logo]()
$165
This Mytrip deal was found by Cheapflights users on 7/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/145:00 pm
DCA
- SEA
Nonstop5h 51m
Alaska Airlines
Deal found 7/30![Alaska Airlines logo]()
$165
This Super.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/38:59 am
IAD
- SEA
1 stop9h 29m
Frontier
Deal found 8/3![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1412:40 pm
PHL
- SEA
2 stops29h 28m
Frontier
Deal found 8/1![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/288:59 am
IAD
- SEA
2 stops27h 20m
Frontier
Deal found 7/30![Frontier logo]()
$167
This Super.com deal was found by Cheapflights users on 7/31. 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.
Fri 9/48:37 pm
PHL
- SEA
1 stop15h 42m
Frontier
Deal found 7/31![Frontier logo]()
$167
This United Airlines deal was found by Cheapflights users on 7/30. 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 9/76:30 am
IAD
- SEA
1 stop11h 22m
United Airlines
Deal found 7/30![United Airlines logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/26:00 am
PHL
- SEA
2 stops36h 08m
Frontier
Deal found 7/31![Frontier logo]()
$168
Find flight deals from Pennsylvania to Washington
Keep the following information in mind while searching for Pennsylvania to Washington flight deals. Data was last updated August 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $283 (Kiwi.com) |
One-way from | $156 (SmartFares) |
Popular in | June |
Cheapest in | January |
Average price | $447 |
Good round-trip deal | $372 or less |
Good one-way deal | $222 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Pennsylvania to Washington 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 August 4, 2026.
Use the filters below to find and compare flights from Pennsylvania to Washington that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Fri 9/25
7:00 am-9:37 am
Nonstop5h 37m
Seattle/Tacoma Intl
Mon 9/28
9:35 pm-5:40 am
Nonstop5h 05m
$285
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Wed 9/2
5:15 pm-10:43 pm
1 stop8h 28m
Seattle/Tacoma Intl
Wed 9/9
11:04 pm-7:09 am
Nonstop5h 05m
$295
Washington, D.C.Seattle
DCA - SEA
DCASEA
Washington, D.C. Reagan-National
Mon 9/14
4:35 pm-11:55 pm
2 stops10h 20m
Seattle/Tacoma Intl
Thu 9/17
5:15 am-2:50 pm
1 stop6h 35m
$310
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Sun 9/20
7:00 am-9:37 am
Nonstop5h 37m
Seattle/Tacoma Intl
Sat 9/26
8:30 am-4:43 pm
Nonstop5h 13m
$321
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Fri 9/11
1:30 pm-7:14 pm
1 stop8h 44m
Seattle/Tacoma Intl
Tue 9/15
7:00 am-5:54 pm
1 stop7h 54m
$329
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Fri 9/11
1:30 pm-7:14 pm
1 stop8h 44m
Seattle/Tacoma Intl
Mon 9/14
11:00 pm-10:02 am
1 stop8h 02m
$329
Washington, D.C.Seattle
DCA - SEA
DCASEA
Washington, D.C. Reagan-National
Tue 9/1
4:35 pm-7:41 pm
Nonstop6h 06m
Seattle/Tacoma Intl
Sat 9/12
7:20 am-3:32 pm
Nonstop5h 12m
$335
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Thu 10/1
1:05 pm-3:51 pm
Nonstop5h 46m
Seattle/Tacoma Intl
Sun 10/4
8:25 am-4:31 pm
Nonstop5h 06m
$347
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Wed 8/26
2:47 pm-8:43 pm
1 stop8h 56m
Seattle/Tacoma Intl
Sun 8/30
11:04 pm-7:07 am
Nonstop5h 03m
$347
Washington, D.C.Seattle
IAD - SEA
IADSEA
Washington, D.C. Dulles Intl
Fri 8/28
6:00 pm-8:45 pm
Nonstop5h 45m
Seattle/Tacoma Intl
Mon 8/31
11:00 pm-9:28 am
1 stop7h 28m
$347
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Pennsylvania to Washington
Have a flexible travel schedule? Discover the best time to fly to Washington from Pennsylvania with our price prediction graph.
IAD-SEA
DCA-SEA
EWR-PDX
PHL-SEA
JFK-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 Washington
USPA-USWA
IAD-SEA
DCA-SEA
EWR-PDX
PHL-SEA
What is the cheapest month to book a flight from Pennsylvania to State of Washington?
Currently, January is the cheapest month in which you can book a flight from Pennsylvania to State of Washington (average of $318). Flying from Pennsylvania to State of Washington 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 WA?
Find hourly flight availability from Pennsylvania to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 4, 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Pennsylvania to State of Washington as you normally would.
Weekly flight availability from Pennsylvania to State of Washington
Explore weekly flight availability from Pennsylvania to Washington. 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 August 4, 2026.
The most flights from USPA to USWA are scheduled on a Friday (8 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (3 on average).
How much does it cost to fly round-trip from Pennsylvania to State of Washington?
Airfare is below average for this route at the moment.
Pennsylvania to State of Washington flights typically cost between $358 and $556 in September.The cheapest round-trip price found within the last 5 days was $329 on United Airlines (Sep 6-Sep 10).
How far ahead should I book a flight from Pennsylvania to State of Washington?
Booking 60 days in advance of your planned departure date is, on average, the best time to get cheap flights from Pennsylvania to State of Washington. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Reviews of airlines servicing Washington
Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated August 4, 2026.
Read reviews from past customers who have flown Southwest,Alaska Airlines, andDelta from Pennsylvania to Washington. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Related info for your journey
Find useful and relevant information for your journey from Pennsylvania to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Pennsylvania to Washington
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Complete your trip
Complete your trip to Washington by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Pennsylvania to Washington by cabin class
Find flights from Pennsylvania to Washington, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Pennsylvania and Washington flights
Browse other Pennsylvania and Washington flight options. Last updated on August 4, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Washington
Find the right flight back to Pennsylvania after your stay in Washington
Pennsylvania to Washington flights
Consider these flights traveling from Pennsylvania to Washington.
Top 7 airlines flying from Pennsylvania to Washington
Discover the top 7 airlines that operate flights from Pennsylvania to Washington. 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 August 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$128 | Average$348 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$134 | Average$286 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$159 | Average$423 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$163 | Average$449 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$168 | Average$486 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$180 | Average$523 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$234 | Average$477 | FlexibilityNo cancel fee | On-time69% |