$165+ 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 5/24. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SEA
Jun 13 — Jun 201
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 October or January, booked 71 days in advance, depart on a Wednesday or Thursday and return on a Tuesday
Cheap flight deals from Philadelphia to Seattle
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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 May 14, 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 May 14, 2026.
This Expedia deal was found by Cheapflights users on 5/9. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/57:16 pm
PHL
- SEA
Nonstop6h 12m
Multiple Airlines
Thu 6/118:12 pm
SEA
- PHL
1 stop31h 15m
Multiple Airlines
Deal found 5/9![Multiple Airlines logo]()
$324
This Expedia deal was found by Cheapflights users on 5/9. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/125:46 pm
PHL
- SEA
1 stop7h 41m
Multiple Airlines
Sun 8/167:41 pm
SEA
- PHL
1 stop13h 08m
Multiple Airlines
Deal found 5/9![Multiple Airlines logo]()
$325
This American Airlines deal was found by Cheapflights users on 5/9. 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 6/236:17 pm
PHL
- SEA
Nonstop6h 18m
American Airlines
Tue 6/3010:35 pm
SEA
- PHL
Nonstop5h 12m
American Airlines
Deal found 5/9![American Airlines logo]()
$328
This Delta deal was found by Cheapflights users on 5/13. 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 9/47:05 am
PHL
- SEA
Nonstop5h 59m
Delta
Mon 9/79:50 pm
SEA
- PHL
Nonstop5h 15m
Delta
Deal found 5/13![Delta logo]()
$329
This Trip.com deal was found by Cheapflights users on 5/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/188:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Fri 5/298:20 pm
SEA
- PHL
1 stop31h 01m
Frontier
Deal found 5/9![Frontier logo]()
$332
This Delta deal was found by Cheapflights users on 5/13. 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 5/297:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Wed 6/39:20 am
SEA
- PHL
Nonstop5h 15m
Delta
Deal found 5/13![Delta logo]()
$333
This Delta deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/306:45 pm
PHL
- SEA
Nonstop6h 14m
Delta
Wed 7/89:20 pm
SEA
- PHL
Nonstop5h 09m
Delta
Deal found 5/9![Delta logo]()
$334
This Expedia deal was found by Cheapflights users on 5/9. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/247:00 am
PHL
- SEA
Nonstop5h 59m
Multiple Airlines
Thu 5/283:19 pm
SEA
- PHL
1 stop11h 18m
Multiple Airlines
Deal found 5/9![Multiple Airlines logo]()
$335
This Frontier deal was found by Cheapflights users on 5/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/1111:00 am
PHL
- SEA
1 stop26h 35m
Frontier
Wed 6/178:12 pm
SEA
- PHL
1 stop31h 15m
Frontier
Deal found 5/12![Frontier logo]()
$336
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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 6/47:16 pm
PHL
- SEA
Nonstop6h 12m
Alaska Airlines
Tue 6/99:59 am
SEA
- PHL
Nonstop5h 17m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$337
This Delta deal was found by Cheapflights users on 5/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/277:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Wed 6/39:20 am
SEA
- PHL
Nonstop5h 15m
Delta
Deal found 5/11![Delta logo]()
$338
This Delta deal was found by Cheapflights users on 5/13. 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 9/46:40 pm
PHL
- SEA
1 stop8h 21m
Delta
Tue 9/89:50 pm
SEA
- PHL
Nonstop5h 15m
Delta
Deal found 5/13![Delta logo]()
$339
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 May 14, 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 May 14, 2026.
This Delta deal was found by Cheapflights users on 5/13. 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 8/207:00 am
PHL
- SEA
Nonstop5h 56m
Delta
Fri 8/219:29 pm
SEA
- PHL
Nonstop5h 11m
Delta
Deal found 5/13![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 5/10. 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 9/192:10 pm
PHL
- SEA
1 stop10h 20m
Southwest
Sat 9/265:00 am
SEA
- PHL
2 stops12h 45m
Southwest
Deal found 5/10![Southwest logo]()
$354
This Alaska Airlines deal was found by Cheapflights users on 5/9. 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.
Thu 6/114:26 pm
PHL
- SEA
Nonstop6h 04m
Alaska Airlines
Tue 6/168:28 am
SEA
- PHL
Nonstop5h 15m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$373
This Delta deal was found by Cheapflights users on 5/13. 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 8/197:00 am
PHL
- SEA
Nonstop5h 56m
Delta
Thu 8/209:29 pm
SEA
- PHL
Nonstop5h 11m
Delta
Deal found 5/13![Delta logo]()
$329
This Delta deal was found by Cheapflights users on 5/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/46:40 pm
PHL
- SEA
1 stop8h 21m
Delta
Fri 9/119:50 pm
SEA
- PHL
Nonstop5h 15m
Delta
Deal found 5/12![Delta logo]()
$339
This Alaska Airlines deal was found by Cheapflights users on 5/11. 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 6/67:16 pm
PHL
- SEA
Nonstop6h 12m
Alaska Airlines
Wed 6/108:28 am
SEA
- PHL
Nonstop5h 15m
Alaska Airlines
Deal found 5/11![Alaska Airlines logo]()
$377
This Delta deal was found by Cheapflights users on 5/10. 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.
Mon 7/207:30 am
PHL
- SEA
1 stop10h 08m
Delta
Mon 7/279:20 pm
SEA
- PHL
Nonstop5h 09m
Delta
Deal found 5/10![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 5/13. 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 8/137:00 pm
PHL
- SEA
1 stop7h 59m
Delta
Thu 8/207:16 am
SEA
- PHL
1 stop8h 26m
Delta
Deal found 5/13![Delta logo]()
$349
This Delta deal was found by Cheapflights users on 5/13. 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 10/146:40 pm
PHL
- SEA
1 stop8h 31m
Delta
Wed 10/2811:05 pm
SEA
- PHL
1 stop6h 36m
Delta
Deal found 5/13![Delta logo]()
$349
This Delta deal was found by Cheapflights users on 5/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/27:05 am
PHL
- SEA
Nonstop5h 56m
Delta
Tue 8/119:29 pm
SEA
- PHL
Nonstop5h 11m
Delta
Deal found 5/12![Delta logo]()
$363
This Delta deal was found by Cheapflights users on 5/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/37:05 am
PHL
- SEA
Nonstop5h 59m
Delta
Mon 9/79:50 pm
SEA
- PHL
Nonstop5h 15m
Delta
Deal found 5/11![Delta logo]()
$363
This Delta deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/176:45 pm
PHL
- SEA
Nonstop6h 14m
Delta
Tue 6/239:25 am
SEA
- PHL
Nonstop5h 10m
Delta
Deal found 5/9![Delta logo]()
$368
Last-minute flights from Philadelphia to SeattleDiscover last-minute flight deals from Philadelphia to Seattle. Data last updated May 14, 2026 and is based on user searches.
Discover last-minute flight deals from Philadelphia to Seattle. Data last updated May 14, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 5/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/188:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Fri 5/298:20 pm
SEA
- PHL
1 stop31h 01m
Frontier
Deal found 5/9![Frontier logo]()
$332
This Trip.com deal was found by Cheapflights users on 5/10. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/188:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Sat 5/238:20 pm
SEA
- PHL
1 stop31h 01m
Frontier
Deal found 5/10![Frontier logo]()
$361
This Booking.com deal was found by Cheapflights users on 5/9. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/198:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Fri 5/293:19 pm
SEA
- PHL
1 stop11h 18m
Frontier
Deal found 5/9![Frontier logo]()
$333
This Super.com deal was found by Cheapflights users on 5/10. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/198:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Sat 5/238:20 pm
SEA
- PHL
1 stop31h 01m
Frontier
Deal found 5/10![Frontier logo]()
$362
This Booking.com deal was found by Cheapflights users on 5/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/198:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Fri 5/223:19 pm
SEA
- PHL
1 stop11h 18m
Frontier
Deal found 5/10![Frontier logo]()
$402
This Flightnetwork deal was found by Cheapflights users on 5/11. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/208:35 pm
PHL
- SEA
1 stop16h 31m
Frontier
Mon 5/258:20 pm
SEA
- PHL
1 stop31h 01m
Frontier
Deal found 5/11![Frontier logo]()
$381
This Super.com deal was found by Cheapflights users on 5/11. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/228:35 pm
PHL
- SEA
1 stop16h 31m
Frontier
Sat 5/308:20 pm
SEA
- PHL
1 stop31h 01m
Frontier
Deal found 5/11![Frontier logo]()
$352
This Super.com deal was found by Cheapflights users on 5/12. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/228:35 pm
PHL
- SEA
1 stop16h 31m
Frontier
Mon 5/258:20 pm
SEA
- PHL
1 stop31h 01m
Frontier
Deal found 5/12![Frontier logo]()
$414
This American Airlines deal was found by Cheapflights users on 5/9. 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.
Sat 5/235:51 pm
PHL
- SEA
1 stop9h 33m
American Airlines
Sat 5/3010:35 pm
SEA
- PHL
Nonstop5h 12m
American Airlines
Deal found 5/9![American Airlines logo]()
$371
This American Airlines deal was found by Cheapflights users on 5/13. 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 5/237:35 pm
PHL
- SEA
Nonstop6h 23m
American Airlines
Tue 5/268:10 am
SEA
- PHL
Nonstop5h 24m
American Airlines
Deal found 5/13![American Airlines logo]()
$406
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 May 14, 2026.
Search for one-way flight options from Philadelphia to Seattle. Find affordable one-way fares based on user searches. Data last updated May 14, 2026.
This Delta deal was found by Cheapflights users on 5/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/66:45 pm
PHL
- SEA
Nonstop6h 14m
Delta
Deal found 5/12![Delta logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 5/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/38:37 pm
PHL
- SEA
1 stop16h 11m
Frontier
Deal found 5/11![Frontier logo]()
$167
This Super.com deal was found by Cheapflights users on 5/9. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/198:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Deal found 5/9![Frontier logo]()
$168
This Delta deal was found by Cheapflights users on 5/13. 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 6/27:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 5/13![Delta logo]()
$169
This American Airlines deal was found by Cheapflights users on 5/10. 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 7/76:21 pm
PHL
- SEA
Nonstop6h 14m
American Airlines
Deal found 5/10![American Airlines logo]()
$170
This CheapOair deal was found by Cheapflights users on 5/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/258:35 pm
PHL
- SEA
1 stop16h 31m
Frontier
Deal found 5/12![Frontier logo]()
$171
This Super.com deal was found by Cheapflights users on 5/13. 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.
Sat 8/2212:42 pm
PHL
- SEA
1 stop24h 06m
Frontier
Deal found 5/13![Frontier logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 5/9. 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 6/110:40 am
PHL
- SEA
2 stops34h 55m
Frontier
Deal found 5/9![Frontier logo]()
$173
This Delta deal was found by Cheapflights users on 5/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/46:45 pm
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 5/11![Delta logo]()
$174
This Delta deal was found by Cheapflights users on 5/13. 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 5/285:17 pm
PHL
- SEA
1 stop9h 42m
Delta
Deal found 5/13![Delta logo]()
$175
This Mytrip deal was found by Cheapflights users on 5/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/248:35 pm
PHL
- SEA
1 stop16h 31m
Frontier
Deal found 5/11![Frontier logo]()
$176
This Kiwi.com deal was found by Cheapflights users on 5/13. 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 7/129:03 pm
PHL
- SEA
2 stops40h 36m
Multiple Airlines
Deal found 5/13![Multiple Airlines logo]()
$178
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 May 14, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $324 (Expedia) |
One-way from | $165 (Delta) |
Popular in | June |
Cheapest in | October |
Average price | $398 |
Good round-trip deal | $370 or less |
Good one-way deal | $217 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 2,558,603 searches. Data last updated May 14, 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
Quickest round-trip
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Thu 8/20
7:00 am-9:56 am
Nonstop5h 56m
Seattle/Tacoma Intl
Fri 8/21
9:29 pm-5:40 am
Nonstop5h 11m
$329
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Wed 8/19
7:00 am-9:56 am
Nonstop5h 56m
Seattle/Tacoma Intl
Thu 8/20
9:29 pm-5:40 am
Nonstop5h 11m
$329
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Fri 9/4
6:40 pm-12:01 am
1 stop8h 21m
Seattle/Tacoma Intl
Fri 9/11
9:50 pm-6:05 am
Nonstop5h 15m
$339
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Mon 7/20
7:30 am-2:38 pm
1 stop10h 08m
Seattle/Tacoma Intl
Mon 7/27
9:20 pm-5:29 am
Nonstop5h 09m
$339
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Thu 8/13
7:00 pm-11:59 pm
1 stop7h 59m
Seattle/Tacoma Intl
Thu 8/20
7:16 am-6:42 pm
1 stop8h 26m
$349
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Wed 10/14
6:40 pm-12:11 am
1 stop8h 31m
Seattle/Tacoma Intl
Wed 10/28
11:05 pm-8:41 am
1 stop6h 36m
$349
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Sat 9/19
2:10 pm-9:30 pm
1 stop10h 20m
Seattle/Tacoma Intl
Sat 9/26
5:00 am-8:45 pm
2 stops12h 45m
$354
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Sun 8/2
7:05 am-10:01 am
Nonstop5h 56m
Seattle/Tacoma Intl
Tue 8/11
9:29 pm-5:40 am
Nonstop5h 11m
$363
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Thu 9/3
7:05 am-10:04 am
Nonstop5h 59m
Seattle/Tacoma Intl
Mon 9/7
9:50 pm-6:05 am
Nonstop5h 15m
$363
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Wed 6/17
6:45 pm-9:59 pm
Nonstop6h 14m
Seattle/Tacoma Intl
Tue 6/23
9:25 am-5:35 pm
Nonstop5h 10m
$368
Showing 1-10 of 20 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 May.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| 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, October is the cheapest month in which you can book a flight from Philadelphia to Seattle (average of $317). Flying from Philadelphia to Seattle in June 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 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 May 14, 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 20% of weekly flights between Philadelphia and Seattle have experienced delays in the past year, with the average delay time being 146 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 evening 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 May 14, 2026.
Read reviews from past customers who have flown Alaska Airlines,Delta, andHawaiian 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
Food
7.0
Boarding
8.1
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Crew
8.5
Food
7.0
Boarding
8.1
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Crew
8.5
Food
7.0
Boarding
8.1
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Crew
8.5
Food
7.0
Boarding
8.1
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Crew
8.5
Food
7.0
Boarding
8.1
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Crew
8.5
Food
7.0
Boarding
8.1
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - 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
Tacoma
Ocean Shores
Olympia
Lacey
Edmonds
Leavenworth
Snoqualmie
Tumwater
Tukwila
Puyallup
Kent
Lynnwood
Renton
Ellensburg
Fife
Lakewood
Issaquah
Shoreline
Marysville
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Philadelphia and Seattle flights
Browse other Philadelphia and Seattle flight options. Last updated on May 14, 2026.
Other flights from Philadelphia
Browse through other flights departing from Philadelphia. Flights are based on user searches made on Cheapflights and were last updated on May 14, 2026.
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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 May 14, 2026.
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 2,558,603 searches. Data last updated May 14, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$130 | Average$295 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$188 | Average$453 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$203 | Average$374 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$203 | Average$426 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$242 | Average$437 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$260 | Average$418 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$274 | Average$427 | FlexibilityNo cancel fee | On-time71% |