Cheap flights from Philadelphia to Seattle (PHL - SEA) - Compare and Save
PHL — SEA
May 3 — May 101
Round-trip
1 adult, Economy
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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
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 April 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $277 (Kiwi.com) |
One-way from | $140 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $402 |
Good round-trip deal | $357 or less |
Good one-way deal | $206 or less |
Find flight deals from Philadelphia to Seattle
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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 April 3, 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 April 3, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/178:36 pm
PHL
- SEA
1 stop15h 51m
Frontier
Mon 4/204:20 pm
SEA
- PHL
2 stops13h 51m
Frontier
Deal found 3/29![Frontier logo]()
$277
This Kiwi.com deal was found by Cheapflights users on 3/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/288:36 pm
PHL
- SEA
1 stop15h 51m
Frontier
Tue 5/57:50 pm
SEA
- PHL
2 stops18h 56m
Frontier
Deal found 3/29![Frontier logo]()
$279
This CheapOair deal was found by Cheapflights users on 3/31. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/2512:42 pm
PHL
- SEA
1 stop24h 06m
Frontier
Mon 8/33:19 pm
SEA
- PHL
1 stop17h 28m
Frontier
Deal found 3/31![Frontier logo]()
$281
This Kiwi.com deal was found by Cheapflights users on 4/1. 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 4/138:53 pm
PHL
- SEA
2 stops39h 34m
Multiple Airlines
Tue 4/217:12 pm
SEA
- PHL
1 stop31h 22m
Multiple Airlines
Deal found 4/1![Multiple Airlines logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 3/31. 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.
Sat 4/1810:54 am
PHL
- SEA
2 stops25h 33m
Multiple Airlines
Tue 4/217:12 pm
SEA
- PHL
1 stop31h 22m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$283
This American Airlines deal was found by Cheapflights users on 3/31. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/68:25 am
PHL
- SEA
Nonstop6h 09m
American Airlines
Mon 5/1110:47 pm
SEA
- PHL
Nonstop5h 13m
American Airlines
Deal found 3/31![American Airlines logo]()
$284
This CheapOair deal was found by Cheapflights users on 4/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/267:22 am
PHL
- SEA
Nonstop5h 58m
Alaska Airlines
Wed 4/299:44 pm
SEA
- PHL
Nonstop5h 18m
Alaska Airlines
Deal found 4/1![Alaska Airlines logo]()
$285
This Frontier deal was found by Cheapflights users on 4/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/166:43 am
PHL
- SEA
1 stop15h 37m
Frontier
Wed 4/227:12 pm
SEA
- PHL
1 stop7h 22m
Frontier
Deal found 4/1![Frontier logo]()
$286
This CheapOair deal was found by Cheapflights users on 3/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/188:41 pm
PHL
- SEA
1 stop15h 46m
Frontier
Thu 4/237:12 pm
SEA
- PHL
1 stop7h 22m
Frontier
Deal found 3/29![Frontier logo]()
$287
This American Airlines deal was found by Cheapflights users on 4/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/248:25 am
PHL
- SEA
Nonstop6h 09m
American Airlines
Wed 5/612:34 pm
SEA
- PHL
Nonstop5h 21m
American Airlines
Deal found 4/1![American Airlines logo]()
$288
This Kiwi.com deal was found by Cheapflights users on 3/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/167:00 am
PHL
- SEA
2 stops13h 42m
Multiple Airlines
Mon 4/207:12 pm
SEA
- PHL
1 stop31h 22m
Multiple Airlines
Deal found 3/29![Multiple Airlines logo]()
$289
This CheapOair deal was found by Cheapflights users on 3/31. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/178:37 pm
PHL
- SEA
1 stop20h 27m
Frontier
Sun 8/237:41 pm
SEA
- PHL
1 stop13h 06m
Frontier
Deal found 3/31![Frontier logo]()
$290
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 April 3, 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 April 3, 2026.
This Delta deal was found by Cheapflights users on 4/1. 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 5/137:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Sat 5/235:30 am
SEA
- PHL
1 stop8h 42m
Delta
Deal found 4/1![Delta logo]()
$294
This Southwest deal was found by Cheapflights users on 4/2. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/25:45 pm
PHL
- SEA
1 stop9h 25m
Southwest
Wed 6/105:00 am
SEA
- PHL
2 stops9h 00m
Southwest
Deal found 4/2![Southwest logo]()
$354
This Alaska Airlines deal was found by Cheapflights users on 4/2. 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.
Tue 9/17:00 am
PHL
- SEA
Nonstop5h 53m
Alaska Airlines
Tue 9/86:48 pm
SEA
- PHL
1 stop17h 56m
Alaska Airlines
Deal found 4/2![Alaska Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 3/31. 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 5/127:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Fri 5/229:20 pm
SEA
- PHL
Nonstop5h 17m
Delta
Deal found 3/31![Delta logo]()
$329
This Delta deal was found by Cheapflights users on 3/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/127:08 am
PHL
- SEA
Nonstop5h 56m
Delta
Mon 7/209:30 pm
SEA
- PHL
Nonstop5h 23m
Delta
Deal found 3/29![Delta logo]()
$329
This Delta deal was found by Cheapflights users on 3/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/226:57 pm
PHL
- SEA
1 stop8h 01m
Delta
Mon 8/39:30 pm
SEA
- PHL
Nonstop5h 23m
Delta
Deal found 3/29![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 3/31. 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.
Fri 7/246:57 pm
PHL
- SEA
1 stop8h 01m
Delta
Tue 8/49:30 pm
SEA
- PHL
Nonstop5h 23m
Delta
Deal found 3/31![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 4/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/316:40 pm
PHL
- SEA
1 stop8h 21m
Delta
Sat 9/129:50 pm
SEA
- PHL
Nonstop5h 15m
Delta
Deal found 4/2![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 4/2. 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 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
Fri 9/1111:53 pm
SEA
- PHL
1 stop7h 40m
Delta
Deal found 4/2![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 3/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/247:08 am
PHL
- SEA
Nonstop5h 56m
Delta
Tue 8/49:30 pm
SEA
- PHL
Nonstop5h 23m
Delta
Deal found 3/30![Delta logo]()
$353
This Delta deal was found by Cheapflights users on 4/1. 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.
Sun 7/127:08 am
PHL
- SEA
Nonstop5h 56m
Delta
Mon 7/209:30 pm
SEA
- PHL
Nonstop5h 23m
Delta
Deal found 4/1![Delta logo]()
$353
This Delta deal was found by Cheapflights users on 4/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/237:00 am
PHL
- SEA
Nonstop5h 59m
Delta
Tue 6/309:31 pm
SEA
- PHL
Nonstop5h 14m
Delta
Deal found 4/2![Delta logo]()
$353
Last-minute flights from Philadelphia to SeattleDiscover last-minute flight deals from Philadelphia to Seattle. Data last updated April 3, 2026 and is based on user searches.
Discover last-minute flight deals from Philadelphia to Seattle. Data last updated April 3, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 4/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/98:25 pm
PHL
- SEA
1 stop18h 12m
Frontier
Mon 4/139:34 pm
SEA
- PHL
1 stop30h 16m
Frontier
Deal found 4/1![Frontier logo]()
$342
This CheapOair deal was found by Cheapflights users on 3/31. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/98:25 pm
PHL
- SEA
1 stop18h 12m
Frontier
Mon 4/139:34 pm
SEA
- PHL
1 stop30h 16m
Frontier
Deal found 3/31![Frontier logo]()
$370
This CheapOair deal was found by Cheapflights users on 3/31. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/98:25 pm
PHL
- SEA
1 stop18h 12m
Frontier
Sat 6/611:21 am
SEA
- PHL
1 stop18h 49m
Frontier
Deal found 3/31![Frontier logo]()
$401
This Kiwi.com deal was found by Cheapflights users on 3/31. 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.
Thu 4/93:36 pm
PHL
- SEA
2 stops23h 01m
Frontier
Tue 4/217:12 pm
SEA
- PHL
1 stop31h 22m
Frontier
Deal found 3/31![Frontier logo]()
$402
This American Airlines deal was found by Cheapflights users on 3/31. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/96:08 pm
PHL
- SEA
Nonstop6h 15m
American Airlines
Sat 6/68:10 am
SEA
- PHL
Nonstop5h 24m
American Airlines
Deal found 3/31![American Airlines logo]()
$410
This CheapOair deal was found by Cheapflights users on 3/30. 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.
Fri 4/108:25 pm
PHL
- SEA
1 stop18h 12m
Frontier
Mon 4/139:34 pm
SEA
- PHL
1 stop30h 16m
Frontier
Deal found 3/30![Frontier logo]()
$356
This CheapOair deal was found by Cheapflights users on 3/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/108:25 pm
PHL
- SEA
1 stop18h 12m
Frontier
Sun 4/199:54 pm
SEA
- PHL
1 stop29h 56m
Frontier
Deal found 3/29![Frontier logo]()
$361
This American Airlines deal was found by Cheapflights users on 3/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/106:08 pm
PHL
- SEA
Nonstop6h 15m
American Airlines
Sun 4/1910:47 pm
SEA
- PHL
Nonstop5h 13m
American Airlines
Deal found 3/29![American Airlines logo]()
$414
This American Airlines deal was found by Cheapflights users on 3/31. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/116:08 pm
PHL
- SEA
Nonstop6h 15m
American Airlines
Sat 4/1810:47 pm
SEA
- PHL
Nonstop5h 13m
American Airlines
Deal found 3/31![American Airlines logo]()
$385
This American Airlines deal was found by Cheapflights users on 3/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/116:08 pm
PHL
- SEA
Nonstop6h 15m
American Airlines
Sat 4/1810:47 pm
SEA
- PHL
Nonstop5h 13m
American Airlines
Deal found 3/30![American Airlines logo]()
$406
This Delta deal was found by Cheapflights users on 3/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/117:00 am
PHL
- SEA
1 stop8h 27m
Delta
Sat 4/1811:11 pm
SEA
- PHL
1 stop6h 44m
Delta
Deal found 3/29![Delta logo]()
$407
This Kiwi.com deal was found by Cheapflights users on 3/31. 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.
Sun 4/128:53 pm
PHL
- SEA
2 stops39h 34m
Multiple Airlines
Tue 4/217:12 pm
SEA
- PHL
1 stop31h 22m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$337
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 April 3, 2026.
Search for one-way flight options from Philadelphia to Seattle. Find affordable one-way fares based on user searches. Data last updated April 3, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 5/18:41 pm
PHL
- SEA
1 stop15h 46m
Frontier
Deal found 3/31![Frontier logo]()
$140
This Kiwi.com deal was found by Cheapflights users on 4/1. 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.
Thu 4/306:43 am
PHL
- SEA
2 stops38h 09m
Frontier
Deal found 4/1![Frontier logo]()
$142
This CheapOair deal was found by Cheapflights users on 4/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/246:58 pm
PHL
- SEA
Nonstop6h 04m
Alaska Airlines
Deal found 4/1![Alaska Airlines logo]()
$143
This Kiwi.com deal was found by Cheapflights users on 3/30. 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.
Tue 4/211:30 pm
PHL
- SEA
2 stops22h 57m
Frontier
Deal found 3/30![Frontier logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 3/30. 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 4/209:17 am
PHL
- SEA
2 stops27h 10m
Frontier
Deal found 3/30![Frontier logo]()
$146
This Delta deal was found by Cheapflights users on 4/1. 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.
Mon 4/275:32 pm
PHL
- SEA
1 stop7h 18m
Delta
Deal found 4/1![Delta logo]()
$147
This Kiwi.com deal was found by Cheapflights users on 3/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1610:38 pm
PHL
- SEA
2 stops37h 49m
Frontier
Deal found 3/29![Frontier logo]()
$148
This Super.com deal was found by Cheapflights users on 4/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/2410:46 am
PHL
- SEA
1 stop26h 49m
Frontier
Deal found 4/2![Frontier logo]()
$149
This Kiwi.com deal was found by Cheapflights users on 3/31. 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.
Wed 4/221:30 pm
PHL
- SEA
2 stops22h 57m
Frontier
Deal found 3/31![Frontier logo]()
$150
This Kiwi.com deal was found by Cheapflights users on 3/31. 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.
Thu 5/78:35 pm
PHL
- SEA
2 stops40h 47m
Frontier
Deal found 3/31![Frontier logo]()
$151
This Booking.com deal was found by Cheapflights users on 4/1. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/178:35 pm
PHL
- SEA
1 stop16h 14m
Frontier
Deal found 4/1![Frontier logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 3/31. 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.
Thu 4/239:00 pm
PHL
- SEA
2 stops39h 27m
Frontier
Deal found 3/31![Frontier logo]()
$153
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 April 3, 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 - SEA
PHLSEA
Philadelphia
Wed 5/13
7:10 am-10:00 am
Nonstop5h 50m
Seattle/Tacoma Intl
Sat 5/23
5:30 am-5:12 pm
1 stop8h 42m
$294
Quickest round-trip
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Tue 5/12
7:10 am-10:00 am
Nonstop5h 50m
Seattle/Tacoma Intl
Fri 5/22
9:20 pm-5:37 am
Nonstop5h 17m
$329
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Sun 7/12
7:08 am-10:04 am
Nonstop5h 56m
Seattle/Tacoma Intl
Mon 7/20
9:30 pm-5:53 am
Nonstop5h 23m
$329
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Wed 7/22
6:57 pm-11:58 pm
1 stop8h 01m
Seattle/Tacoma Intl
Mon 8/3
9:30 pm-5:53 am
Nonstop5h 23m
$339
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Fri 7/24
6:57 pm-11:58 pm
1 stop8h 01m
Seattle/Tacoma Intl
Tue 8/4
9:30 pm-5:53 am
Nonstop5h 23m
$339
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Mon 8/31
6:40 pm-12:01 am
1 stop8h 21m
Seattle/Tacoma Intl
Sat 9/12
9:50 pm-6:05 am
Nonstop5h 15m
$339
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Thu 9/3
7:05 am-10:04 am
Nonstop5h 59m
Seattle/Tacoma Intl
Fri 9/11
11:53 pm-10:33 am
1 stop7h 40m
$339
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Fri 7/24
7:08 am-10:04 am
Nonstop5h 56m
Seattle/Tacoma Intl
Tue 8/4
9:30 pm-5:53 am
Nonstop5h 23m
$353
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Sun 7/12
7:08 am-10:04 am
Nonstop5h 56m
Seattle/Tacoma Intl
Mon 7/20
9:30 pm-5:53 am
Nonstop5h 23m
$353
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Tue 6/23
7:00 am-9:59 am
Nonstop5h 59m
Seattle/Tacoma Intl
Tue 6/30
9:31 pm-5:45 am
Nonstop5h 14m
$353
Showing 1-10 of 24 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 April.
| 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 Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | 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?
Use this chart to determine the optimal time to book a round-trip flight from Philadelphia to Seattle. Price data was last updated on April 2, 2026.
The best time to book flights from Philadelphia to Seattle is 71 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 $148). Flying from Philadelphia to Seattle in August is currently the most expensive (average of $220). 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 April 3, 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 19% of weekly flights between Philadelphia and Seattle have experienced delays in the past year, with the average delay time being 151 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.
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 April 3, 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
Overall
7.9
Boarding
8.1
Food
7.0
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Crew
8.5
Overall
7.9
Boarding
8.1
Food
7.0
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Crew
8.5
Overall
7.9
Boarding
8.1
Food
7.0
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Crew
8.5
Overall
7.9
Boarding
8.1
Food
7.0
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Crew
8.5
Overall
7.9
Boarding
8.1
Food
7.0
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Crew
8.5
Overall
7.9
Boarding
8.1
Food
7.0
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
Kent
Lynnwood
Lacey
Edmonds
Leavenworth
Snoqualmie
Tukwila
Renton
Puyallup
Kirkland
Ellensburg
Fife
Lakewood
Issaquah
Shoreline
Aberdeen
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Philadelphia and Seattle flights
Browse other Philadelphia and Seattle flight options. Last updated on April 3, 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 April 3, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Seattle
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on April 3, 2026.
Top 8 airlines flying from Philadelphia to Seattle
Discover the top 8 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 April 3, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$115 | Average$237 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$130 | Average$295 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$199 | Average$473 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$203 | Average$436 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$224 | Average$373 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$251 | Average$455 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$258 | Average$419 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$276 | Average$424 | FlexibilityNo cancel fee | On-time71% |