$167+ Cheap flights from Philadelphia to Seattle (PHL - 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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SEA
Sep 20 — Sep 271
Round-trip
1 adult, Economy
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Find cheap flights from Philadelphia to Seattle with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Philadelphia to Seattle/Tacoma Intl are usually found in January or October, booked 71 days in advance, depart on a Wednesday or Thursday and return on a Tuesday
Cheap flight deals from Philadelphia to Seattle
Cheapest
Best
Last-minute
One-way
Cheapest flights from Philadelphia to SeattleExplore the most affordable flight options available from Philadelphia to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 21, 2026.
Explore the most affordable flight options available from Philadelphia to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 21, 2026.
This CheapOair deal was found by Cheapflights users on 8/17. 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 8/228:37 pm -
1 stop15h 42m
Sun 8/309:29 pm -
1 stop30h 01m
Deal found 8/17![Frontier logo]()
$329
This Kiwi.com deal was found by Cheapflights users on 8/16. 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 10/88:44 pm -
1 stop16h 04m
Fri 10/164:27 pm -
1 stop29h 49m
Deal found 8/16![Frontier logo]()
$330
This CheapOair deal was found by Cheapflights users on 8/19. 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.
Fri 10/165:50 am -
1 stop12h 22m
Fri 10/234:27 pm -
1 stop29h 49m
Deal found 8/19![Frontier logo]()
$331
This Super.com deal was found by Cheapflights users on 8/16. 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 8/218:37 pm -
1 stop15h 42m
Tue 8/258:53 pm -
1 stop30h 37m
Deal found 8/16![Frontier logo]()
$332
This Kiwi.com deal was found by Cheapflights users on 8/17. 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 9/28:00 am -
1 stop29h 39m
Wed 9/97:25 pm -
2 stops32h 51m
Deal found 8/17![Frontier logo]()
$333
This CheapOair deal was found by Cheapflights users on 8/19. 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.
Wed 8/268:00 am -
1 stop29h 39m
Sun 8/307:06 pm -
1 stop7h 33m
Deal found 8/19![Frontier logo]()
$334
This Kiwi.com deal was found by Cheapflights users on 8/17. 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 9/18:37 pm -
1 stop15h 42m
Sat 9/128:15 pm -
2 stops32h 01m
Deal found 8/17![Frontier logo]()
$335
This CheapOair deal was found by Cheapflights users on 8/18. 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.
Thu 10/88:44 pm -
1 stop16h 04m
Mon 10/124:27 pm -
1 stop29h 49m
Deal found 8/18![Frontier logo]()
$336
This Southwest deal was found by Cheapflights users on 8/21. 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 9/166:25 pm -
1 stop8h 15m
Wed 9/305:20 am -
1 stop9h 40m
Deal found 8/21![Southwest logo]()
$337
This CheapOair deal was found by Cheapflights users on 8/16. 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.
Tue 9/18:37 pm -
1 stop15h 42m
Tue 9/87:06 pm -
1 stop7h 33m
Deal found 8/16![Frontier logo]()
$339
This Kiwi.com deal was found by Cheapflights users on 8/21. 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 9/810:15 pm -
1 stop14h 27m
Mon 9/149:45 pm -
2 stops22h 33m
Deal found 8/21![Frontier logo]()
$340
This Alaska Airlines deal was found by Cheapflights users on 8/18. 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 9/287:00 am -
Nonstop5h 51m
Mon 9/281:50 pm -
2 stops22h 55m
Deal found 8/18![Alaska Airlines logo]()
$341
Best flights from Philadelphia to SeattleDiscover carefully curated flight deals from Philadelphia to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 21, 2026.
Discover carefully curated flight deals from Philadelphia to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 21, 2026.
This Delta deal was found by Cheapflights users on 8/20. 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.
Sat 9/267:05 am -
Nonstop5h 51m
Wed 9/309:30 pm -
Nonstop5h 20m
Deal found 8/20![Delta logo]()
$359
This Alaska Airlines deal was found by Cheapflights users on 8/20. 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 9/267:00 am -
Nonstop5h 51m
Sat 10/39:19 am -
Nonstop5h 19m
Deal found 8/20![Alaska Airlines logo]()
$359
This United Airlines deal was found by Cheapflights users on 8/16. 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 9/266:10 am -
1 stop8h 17m
Tue 9/2911:13 pm -
1 stop7h 58m
Deal found 8/16![United Airlines logo]()
$377
This Southwest deal was found by Cheapflights users on 8/16. 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 9/68:25 am -
1 stop8h 50m
Tue 9/155:20 am -
1 stop7h 40m
Deal found 8/16![Southwest logo]()
$378
This Delta deal was found by Cheapflights users on 8/17. 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 9/187:05 am -
Nonstop5h 51m
Mon 9/219:30 pm -
Nonstop5h 20m
Deal found 8/17![Delta logo]()
$359
This United Airlines deal was found by Cheapflights users on 8/17. 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 9/101:30 pm -
1 stop8h 44m
Tue 9/157:00 am -
1 stop7h 54m
Deal found 8/17![United Airlines logo]()
$377
This Southwest deal was found by Cheapflights users on 8/17. 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 9/101:05 pm -
1 stop7h 30m
Wed 9/1611:05 pm -
2 stops11h 10m
Deal found 8/17![Southwest logo]()
$382
This United Airlines deal was found by Cheapflights users on 8/16. 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 11/146:00 am -
1 stop9h 20m
Mon 11/237:00 am -
1 stop7h 42m
Deal found 8/16![United Airlines logo]()
$377
This Delta deal was found by Cheapflights users on 8/19. 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 10/63:46 pm -
1 stop9h 17m
Mon 10/127:55 pm -
1 stop7h 10m
Deal found 8/19![Delta logo]()
$379
This Southwest deal was found by Cheapflights users on 8/20. 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 11/101:25 pm -
2 stops11h 50m
Sat 11/1410:40 am -
1 stop9h 10m
Deal found 8/20![Southwest logo]()
$382
This Southwest deal was found by Cheapflights users on 8/20. 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 11/175:15 pm -
1 stop8h 15m
Wed 11/189:25 am -
2 stops8h 55m
Deal found 8/20![Southwest logo]()
$382
This Southwest deal was found by Cheapflights users on 8/16. 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 10/175:25 am -
2 stops12h 05m
Sat 10/246:15 am -
2 stops10h 45m
Deal found 8/16![Southwest logo]()
$387
Last-minute flights from Philadelphia to SeattleDiscover last-minute flight deals from Philadelphia to Seattle. Data last updated August 21, 2026 and is based on user searches.
Discover last-minute flight deals from Philadelphia to Seattle. Data last updated August 21, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 8/16. 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 8/218:37 pm -
1 stop15h 42m
Tue 8/258:53 pm -
1 stop30h 37m
Deal found 8/16![Frontier logo]()
$332
This CheapOair deal was found by Cheapflights users on 8/17. 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 8/228:37 pm -
1 stop15h 42m
Sun 8/309:29 pm -
1 stop30h 01m
Deal found 8/17![Frontier logo]()
$329
This CheapOair deal was found by Cheapflights users on 8/19. 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.
Wed 8/268:00 am -
1 stop29h 39m
Sun 8/307:06 pm -
1 stop7h 33m
Deal found 8/19![Frontier logo]()
$334
This Kiwi.com deal was found by Cheapflights users on 8/17. 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 9/18:37 pm -
1 stop15h 42m
Thu 9/109:45 pm -
2 stops30h 31m
Deal found 8/17![Frontier logo]()
$330
This Kiwi.com deal was found by Cheapflights users on 8/17. 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 9/18:37 pm -
1 stop15h 42m
Sat 9/128:15 pm -
2 stops32h 01m
Deal found 8/17![Frontier logo]()
$335
This Kiwi.com deal was found by Cheapflights users on 8/17. 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 9/18:37 pm -
1 stop15h 42m
Fri 9/119:45 pm -
2 stops17h 29m
Deal found 8/17![Frontier logo]()
$336
This CheapOair deal was found by Cheapflights users on 8/16. 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.
Tue 9/18:37 pm -
1 stop15h 42m
Tue 9/87:06 pm -
1 stop7h 33m
Deal found 8/16![Frontier logo]()
$339
This Kiwi.com deal was found by Cheapflights users on 8/17. 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 9/28:00 am -
1 stop29h 39m
Wed 9/97:25 pm -
2 stops32h 51m
Deal found 8/17![Frontier logo]()
$333
This Kiwi.com deal was found by Cheapflights users on 8/21. 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 9/810:15 pm -
1 stop14h 27m
Mon 9/149:45 pm -
2 stops22h 33m
Deal found 8/21![Frontier logo]()
$340
This Southwest deal was found by Cheapflights users on 8/21. 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 9/166:25 pm -
1 stop8h 15m
Wed 9/305:20 am -
1 stop9h 40m
Deal found 8/21![Southwest logo]()
$337
This Alaska Airlines deal was found by Cheapflights users on 8/18. 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 9/287:00 am -
Nonstop5h 51m
Mon 9/281:50 pm -
2 stops22h 55m
Deal found 8/18![Alaska Airlines logo]()
$341
One-way flights from Philadelphia to SeattleSearch for one-way flight options from Philadelphia to Seattle. Find affordable one-way fares based on user searches. Data last updated August 21, 2026.
Search for one-way flight options from Philadelphia to Seattle. Find affordable one-way fares based on user searches. Data last updated August 21, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/21. 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 10/205:22 pm -
2 stops28h 23m
Deal found 8/21![Frontier logo]()
$167
This Frontier deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/88:44 pm -
1 stop16h 04m
Deal found 8/17![Frontier logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 8/18. 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 9/168:41 am -
2 stops28h 01m
Deal found 8/18![Frontier logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 8/17. 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 9/145:32 pm -
2 stops19h 10m
Deal found 8/17![Frontier logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 8/16. 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 9/305:32 pm -
2 stops28h 04m
Deal found 8/16![Frontier logo]()
$174
This Kiwi.com deal was found by Cheapflights users on 8/16. 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 9/1212:40 pm -
2 stops24h 02m
Deal found 8/16![Frontier logo]()
$176
This Kiwi.com deal was found by Cheapflights users on 8/18. 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 9/288:41 am -
2 stops36h 55m
Deal found 8/18![Frontier logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 8/16. 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 9/215:15 am -
2 stops31h 27m
Deal found 8/16![Frontier logo]()
$179
Find flight deals from Philadelphia to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 21, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $329 (CheapOair) |
One-way from | $167 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $460 |
Good round-trip deal | $393 or less |
Good one-way deal | $232 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Philadelphia 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 7,457,451 searches. Data last updated August 21, 2026.
Use the filters below to find and compare flights from Philadelphia to Seattle that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
PhiladelphiaSeattle
PHL Philadelphia - SEA Seattle/Tacoma Intl
PHLSEA
Philadelphia
Sat 9/26
7:05 am-9:56 am
Nonstop5h 51m
Seattle/Tacoma Intl
Wed 9/30
9:30 pm-5:50 am
Nonstop5h 20m
$359
Quickest round-trip
PhiladelphiaSeattle
PHL Philadelphia - SEA Seattle/Tacoma Intl
PHLSEA
Philadelphia
Sat 9/26
7:00 am-9:51 am
Nonstop5h 51m
Seattle/Tacoma Intl
Sat 10/3
9:19 am-5:38 pm
Nonstop5h 19m
$359
PhiladelphiaSeattle
PHL Philadelphia - SEA Seattle/Tacoma Intl
PHLSEA
Philadelphia
Fri 9/18
7:05 am-9:56 am
Nonstop5h 51m
Seattle/Tacoma Intl
Mon 9/21
9:30 pm-5:50 am
Nonstop5h 20m
$359
PhiladelphiaSeattle
PHL Philadelphia - SEA Seattle/Tacoma Intl
PHLSEA
Philadelphia
Sat 9/26
6:10 am-11:27 am
1 stop8h 17m
Seattle/Tacoma Intl
Tue 9/29
11:13 pm-10:11 am
1 stop7h 58m
$377
PhiladelphiaSeattle
PHL Philadelphia - SEA Seattle/Tacoma Intl
PHLSEA
Philadelphia
Thu 9/10
1:30 pm-7:14 pm
1 stop8h 44m
Seattle/Tacoma Intl
Tue 9/15
7:00 am-5:54 pm
1 stop7h 54m
$377
PhiladelphiaSeattle
PHL Philadelphia - SEA Seattle/Tacoma Intl
PHLSEA
Philadelphia
Sat 11/14
6:00 am-12:20 pm
1 stop9h 20m
Seattle/Tacoma Intl
Mon 11/23
7:00 am-5:42 pm
1 stop7h 42m
$377
PhiladelphiaSeattle
PHL Philadelphia - SEA Seattle/Tacoma Intl
PHLSEA
Philadelphia
Sun 9/6
8:25 am-2:15 pm
1 stop8h 50m
Seattle/Tacoma Intl
Tue 9/15
5:20 am-4:00 pm
1 stop7h 40m
$378
PhiladelphiaSeattle
PHL Philadelphia - SEA Seattle/Tacoma Intl
PHLSEA
Philadelphia
Tue 10/6
3:46 pm-10:03 pm
1 stop9h 17m
Seattle/Tacoma Intl
Mon 10/12
7:55 pm-6:05 am
1 stop7h 10m
$379
PhiladelphiaSeattle
PHL Philadelphia - SEA Seattle/Tacoma Intl
PHLSEA
Philadelphia
Thu 9/10
1:05 pm-5:35 pm
1 stop7h 30m
Seattle/Tacoma Intl
Wed 9/16
11:05 pm-1:15 pm
2 stops11h 10m
$382
PhiladelphiaSeattle
PHL Philadelphia - SEA Seattle/Tacoma Intl
PHLSEA
Philadelphia
Tue 11/10
1:25 pm-10:15 pm
2 stops11h 50m
Seattle/Tacoma Intl
Sat 11/14
10:40 am-10:50 pm
1 stop9h 10m
$382
Showing 1-10 of 22 resultsSorted by cheapest first
Compare providers for flights from Philadelphia to Seattle
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Philadelphia to Seattle in August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Philadelphia-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Philadelphia-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Philadelphia-Seattle flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Philadelphia-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Philadelphia-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Philadelphia to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from Philadelphia with our price prediction graph.
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 Philadelphia to Seattle
Prices
Airlines
Delays
More
How far ahead should I book a flight from Philadelphia to Seattle?
The best time to book flights from Philadelphia to Seattle is 70 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from Philadelphia to Seattle?
Currently, January is the cheapest month in which you can book a flight from Philadelphia to Seattle (average of $318). Flying from Philadelphia to Seattle in June is currently the most expensive (average of $467). 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 PHL to SEA?
Find hourly flight availability from Philadelphia 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 August 21, 2026.
When flying from Philadelphia to Seattle, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
How often are flights from Philadelphia to Seattle delayed?
About 18% of weekly flights between Philadelphia and Seattle have experienced delays in the past year, with the average delay time being 154 minutes.
What is the most punctual flight time for Philadelphia to Seattle flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Tuesday tends to have the lowest number of delays on this route, whereas Friday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Philadelphia to Seattle flights?
Over the last year, American Airlines have had the lowest number of delays on this route, with just 16% of flights being delayed.
What’s the top layover airport for flights from Philadelphia to Seattle?
Share of 1-stop round-trip flights from Philadelphia to Seattle chosen by Cheapflights users in the past 12 months, using the same layover each way.
Denver (DEN) – chosen by Cheapflights users on 67% of 1-stop itineraries from Philadelphia to Seattle on Cheapflights.
What’s the cheapest layover airport for flights from Philadelphia to Seattle?
Average round-trip fare for 1-stop flights from Philadelphia to Seattle, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $208.
What’s the fastest layover option from Philadelphia to Seattle?
Shortest average travel time for 1-stop one-way flights from Philadelphia to Seattle, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Chicago (ORD) have the shortest average one-way travel time for 1-stop routes: 8h 04m.
Which airport typically offers the quickest layover for flights from Philadelphia to Seattle?
Average layover duration for 1-stop one-way flights from Philadelphia to Seattle, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Chicago (ORD) offer the fastest connection on this route, with an average layover time of 1h 05m.
The best insider tips for Philadelphia to Seattle flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Philadelphia to Seattle trip
Our travel experts
Reviews of airlines servicing Seattle
Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated August 21, 2026.
Read reviews from past customers who have flown Alaska Airlines,Delta, andUnited Airlines from Philadelphia to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Overall
7.9
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Overall
7.9
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Overall
7.9
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Overall
7.9
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Overall
7.9
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Overall
7.9
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Related info for your journey
Find useful and relevant information for your journey from Philadelphia 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
Tukwila
Olympia
Edmonds
Snoqualmie
Lynnwood
Tumwater
Centralia
Puyallup
Kent
Marysville
Ellensburg
Ocean Shores
Lakewood
Fife
Poulsbo
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Philadelphia and Seattle flights
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Other flights from Philadelphia
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Top 7 airlines flying from Philadelphia to Seattle
Discover the top 7 airlines that operate flights from Philadelphia 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 7,457,451 searches. Data last updated August 21, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$134 | Average$276 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$138 | Average$278 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$163 | Average$401 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$238 | Average$420 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$248 | Average$390 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$271 | Average$450 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$275 | Average$448 | FlexibilityNo cancel fee | On-time71% |