$165+ Cheap flights from Seattle to Philadelphia (SEA - PHL)
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 11/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
Jul 23 — Jul 301
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Seattle to Philadelphia 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 Seattle/Tacoma Intl to Philadelphia are usually found in October or January, booked 81 days in advance, depart on a Tuesday or Thursday and return on a Wednesday
Cheap flight deals from Seattle to Philadelphia
Cheapest
Best
Last-minute
One-way
Cheapest flights from Seattle to PhiladelphiaExplore the most affordable flight options available from Seattle to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 23, 2026.
Explore the most affordable flight options available from Seattle to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 23, 2026.
This Delta deal was found by Cheapflights users on 6/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/29:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Fri 9/47:05 am
PHL
- SEA
Nonstop5h 56m
Delta
Deal found 6/18![Delta logo]()
$329
This CheapOair deal was found by Cheapflights users on 6/21. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/47:41 pm
SEA
- PHL
1 stop13h 08m
Frontier
Mon 7/1312:54 pm
PHL
- SEA
1 stop23h 23m
Frontier
Deal found 6/21![Frontier logo]()
$330
This Frontier deal was found by Cheapflights users on 6/18. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/297:06 pm
SEA
- PHL
1 stop13h 43m
Frontier
Thu 8/68:37 pm
PHL
- SEA
1 stop15h 27m
Frontier
Deal found 6/18![Frontier logo]()
$331
This Expedia deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” 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.
Tue 6/238:12 pm
SEA
- PHL
1 stop31h 15m
Multiple Airlines
Tue 7/287:33 am
PHL
- SEA
Nonstop5h 59m
Multiple Airlines
Deal found 6/23![Multiple Airlines logo]()
$333
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/308:12 pm
SEA
- PHL
1 stop31h 15m
Frontier
Sun 7/58:37 pm
PHL
- SEA
1 stop17h 43m
Frontier
Deal found 6/20![Frontier logo]()
$334
This Kiwi.com deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” 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 7/167:06 pm
SEA
- PHL
1 stop7h 33m
Frontier
Tue 7/214:30 pm
PHL
- SEA
2 stops19h 47m
Frontier
Deal found 6/22![Frontier logo]()
$335
This Expedia deal was found by Cheapflights users on 6/20. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/119:25 pm
SEA
- PHL
Nonstop5h 15m
Multiple Airlines
Sat 10/173:25 pm
PHL
- SEA
1 stop10h 13m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$336
This Expedia deal was found by Cheapflights users on 6/20. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/238:12 pm
SEA
- PHL
1 stop31h 15m
Multiple Airlines
Sat 7/47:33 am
PHL
- SEA
Nonstop5h 59m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$337
This Delta deal was found by Cheapflights users on 6/20. 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.
Thu 11/129:50 pm
SEA
- PHL
Nonstop5h 13m
Delta
Sun 11/156:40 pm
PHL
- SEA
1 stop8h 31m
Delta
Deal found 6/20![Delta logo]()
$338
This Delta deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/27:16 am
SEA
- PHL
1 stop9h 42m
Delta
Mon 9/77:05 am
PHL
- SEA
Nonstop5h 56m
Delta
Deal found 6/23![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” 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 8/139:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Thu 8/207:00 pm
PHL
- SEA
1 stop7h 59m
Delta
Deal found 6/22![Delta logo]()
$340
Best flights from Seattle to PhiladelphiaDiscover carefully curated flight deals from Seattle to Philadelphia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 23, 2026.
Discover carefully curated flight deals from Seattle to Philadelphia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 23, 2026.
This Delta deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” 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 9/109:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Sun 9/276:55 pm
PHL
- SEA
1 stop8h 04m
Delta
Deal found 6/22![Delta logo]()
$339
This United Airlines deal was found by Cheapflights users on 6/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/126:15 pm
SEA
- PHL
2 stops12h 28m
United Airlines
Wed 8/199:27 am
PHL
- SEA
1 stop12h 02m
United Airlines
Deal found 6/21![United Airlines logo]()
$388
This Southwest deal was found by Cheapflights users on 6/18. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/311:05 pm
SEA
- PHL
1 stop9h 30m
Southwest
Wed 8/123:00 pm
PHL
- SEA
2 stops11h 05m
Southwest
Deal found 6/18![Southwest logo]()
$407
This Alaska Airlines deal was found by Cheapflights users on 6/18. 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.
Thu 7/910:29 pm
SEA
- PHL
1 stop13h 54m
Alaska Airlines
Sun 7/127:33 am
PHL
- SEA
Nonstop5h 59m
Alaska Airlines
Deal found 6/18![Alaska Airlines logo]()
$427
This Delta deal was found by Cheapflights users on 6/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1811:59 am
SEA
- PHL
1 stop8h 57m
Delta
Sun 9/207:05 am
PHL
- SEA
Nonstop5h 51m
Delta
Deal found 6/21![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 6/19. 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.
Wed 9/99:35 pm
SEA
- PHL
Nonstop5h 20m
Delta
Mon 9/285:22 pm
PHL
- SEA
1 stop9h 37m
Delta
Deal found 6/19![Delta logo]()
$339
This Delta deal was found by Cheapflights users on 6/20. 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.
Wed 9/29:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Sat 9/53:55 pm
PHL
- SEA
1 stop11h 02m
Delta
Deal found 6/20![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 6/19. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/311:05 pm
SEA
- PHL
1 stop8h 55m
Southwest
Sat 7/114:50 pm
PHL
- SEA
2 stops10h 50m
Southwest
Deal found 6/19![Southwest logo]()
$432
This Delta deal was found by Cheapflights users on 6/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/189:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Wed 9/27:05 am
PHL
- SEA
Nonstop5h 56m
Delta
Deal found 6/21![Delta logo]()
$359
This Delta deal was found by Cheapflights users on 6/19. 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.
Wed 8/199:30 pm
SEA
- PHL
Nonstop5h 20m
Delta
Fri 8/217:00 pm
PHL
- SEA
1 stop7h 59m
Delta
Deal found 6/19![Delta logo]()
$363
Last-minute flights from Seattle to PhiladelphiaDiscover last-minute flight deals from Seattle to Philadelphia. Data last updated June 23, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Philadelphia. Data last updated June 23, 2026 and is based on user searches.
This Expedia deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” 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.
Tue 6/238:12 pm
SEA
- PHL
1 stop31h 15m
Multiple Airlines
Tue 7/287:33 am
PHL
- SEA
Nonstop5h 59m
Multiple Airlines
Deal found 6/23![Multiple Airlines logo]()
$333
This Expedia deal was found by Cheapflights users on 6/20. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/238:12 pm
SEA
- PHL
1 stop31h 15m
Multiple Airlines
Sat 7/47:33 am
PHL
- SEA
Nonstop5h 59m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$337
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/308:12 pm
SEA
- PHL
1 stop31h 15m
Frontier
Sun 7/58:37 pm
PHL
- SEA
1 stop17h 43m
Frontier
Deal found 6/20![Frontier logo]()
$334
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/17:41 pm
SEA
- PHL
1 stop13h 06m
Frontier
Mon 7/68:37 pm
PHL
- SEA
1 stop15h 40m
Frontier
Deal found 6/20![Frontier logo]()
$344
This CheapOair deal was found by Cheapflights users on 6/21. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/47:41 pm
SEA
- PHL
1 stop13h 08m
Frontier
Mon 7/1312:54 pm
PHL
- SEA
1 stop23h 23m
Frontier
Deal found 6/21![Frontier logo]()
$330
This Mytrip deal was found by Cheapflights users on 6/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/48:28 am
SEA
- PHL
Nonstop5h 15m
Multiple Airlines
Sun 7/128:37 pm
PHL
- SEA
1 stop15h 40m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$343
This Super.com deal was found by Cheapflights users on 6/18. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/158:13 pm
SEA
- PHL
1 stop30h 47m
Frontier
Thu 7/238:37 pm
PHL
- SEA
1 stop15h 40m
Frontier
Deal found 6/18![Frontier logo]()
$342
This Kiwi.com deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” 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 7/167:06 pm
SEA
- PHL
1 stop7h 33m
Frontier
Tue 7/214:30 pm
PHL
- SEA
2 stops19h 47m
Frontier
Deal found 6/22![Frontier logo]()
$335
This Booking.com deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” 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 7/197:06 pm
SEA
- PHL
1 stop7h 33m
Frontier
Sat 7/2511:06 am
PHL
- SEA
1 stop26h 33m
Frontier
Deal found 6/22![Frontier logo]()
$345
This American Airlines deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2210:35 pm
SEA
- PHL
Nonstop5h 13m
American Airlines
Sun 7/267:35 pm
PHL
- SEA
Nonstop6h 21m
American Airlines
Deal found 6/22![American Airlines logo]()
$329
This Frontier deal was found by Cheapflights users on 6/18. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/297:06 pm
SEA
- PHL
1 stop13h 43m
Frontier
Thu 8/68:37 pm
PHL
- SEA
1 stop15h 27m
Frontier
Deal found 6/18![Frontier logo]()
$331
One-way flights from Seattle to PhiladelphiaSearch for one-way flight options from Seattle to Philadelphia. Find affordable one-way fares based on user searches. Data last updated June 23, 2026.
Search for one-way flight options from Seattle to Philadelphia. Find affordable one-way fares based on user searches. Data last updated June 23, 2026.
This Delta deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” 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 7/289:20 pm
SEA
- PHL
Nonstop5h 09m
Delta
Deal found 6/22![Delta logo]()
$165
This Trip.com deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/48:13 pm
SEA
- PHL
2 stops23h 15m
Frontier
Deal found 6/23![Frontier logo]()
$166
This United Airlines deal was found by Cheapflights users on 6/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/155:00 am
SEA
- PHL
1 stop10h 57m
United Airlines
Deal found 6/18![United Airlines logo]()
$167
This United Airlines deal was found by Cheapflights users on 6/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2411:00 pm
SEA
- PHL
1 stop10h 23m
United Airlines
Deal found 6/20![United Airlines logo]()
$168
This Delta deal was found by Cheapflights users on 6/20. 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.
Wed 7/19:25 am
SEA
- PHL
Nonstop5h 10m
Delta
Deal found 6/20![Delta logo]()
$169
This Super.com deal was found by Cheapflights users on 6/21. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/97:06 pm
SEA
- PHL
1 stop7h 33m
Frontier
Deal found 6/21![Frontier logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 6/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:06 pm
SEA
- PHL
2 stops33h 09m
Frontier
Deal found 6/19![Frontier logo]()
$173
This Super.com deal was found by Cheapflights users on 6/20. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/107:06 pm
SEA
- PHL
1 stop7h 33m
Frontier
Deal found 6/20![Frontier logo]()
$174
This Delta deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” 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 9/177:59 pm
SEA
- PHL
1 stop7h 06m
Delta
Deal found 6/22![Delta logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 6/21. 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.
Mon 8/177:06 pm
SEA
- PHL
2 stops14h 20m
Frontier
Deal found 6/21![Frontier logo]()
$176
This Super.com deal was found by Cheapflights users on 6/21. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/267:41 pm
SEA
- PHL
1 stop13h 06m
Frontier
Deal found 6/21![Frontier logo]()
$178
Find flight deals from Seattle to Philadelphia
Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Philadelphia (PHL). 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 June 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $329 (Delta) |
One-way from | $165 (Delta) |
Popular in | December |
Cheapest in | October |
Average price | $452 |
Good round-trip deal | $385 or less |
Good one-way deal | $214 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Seattle to Philadelphia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 23, 2026.
Use the filters below to find and compare flights from Seattle to Philadelphia that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 9/10
9:30 pm-5:50 am
Nonstop5h 20m
Philadelphia
Sun 9/27
6:55 pm-11:59 pm
1 stop8h 04m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 9/18
11:59 am-11:56 pm
1 stop8h 57m
Philadelphia
Sun 9/20
7:05 am-9:56 am
Nonstop5h 51m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 9/9
9:35 pm-5:55 am
Nonstop5h 20m
Philadelphia
Mon 9/28
5:22 pm-11:59 pm
1 stop9h 37m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 9/2
9:30 pm-5:50 am
Nonstop5h 20m
Philadelphia
Sat 9/5
3:55 pm-11:57 pm
1 stop11h 02m
$339
Quickest round-trip
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Tue 8/18
9:30 pm-5:50 am
Nonstop5h 20m
Philadelphia
Wed 9/2
7:05 am-10:01 am
Nonstop5h 56m
$359
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 8/19
9:30 pm-5:50 am
Nonstop5h 20m
Philadelphia
Fri 8/21
7:00 pm-11:59 pm
1 stop7h 59m
$363
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 8/12
6:15 pm-9:43 am
2 stops12h 28m
Philadelphia
Wed 8/19
9:27 am-6:29 pm
1 stop12h 02m
$388
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Mon 8/3
11:05 pm-11:35 am
1 stop9h 30m
Philadelphia
Wed 8/12
3:00 pm-11:05 pm
2 stops11h 05m
$407
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 7/9
10:29 pm-3:23 pm
1 stop13h 54m
Philadelphia
Sun 7/12
7:33 am-10:32 am
Nonstop5h 59m
$427
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 7/3
11:05 pm-11:00 am
1 stop8h 55m
Philadelphia
Sat 7/11
4:50 pm-12:40 am
2 stops10h 50m
$432
Showing 1-10 of 22 resultsSorted by cheapest first
Compare providers for flights from Seattle to Philadelphia
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 Seattle to Philadelphia in June.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Seattle-Philadelphia flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Philadelphia flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Philadelphia flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Seattle-Philadelphia 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 Seattle-Philadelphia 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 Seattle to Philadelphia
Have a flexible travel schedule? Discover the best time to fly to Philadelphia from Seattle with our price prediction graph.
SEA-PHL
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 Seattle to Philadelphia
Prices
Airlines
How far ahead should I book a flight from Seattle to Philadelphia?
The best time to book flights from Seattle to Philadelphia is 80 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 Seattle to Philadelphia?
Currently, October is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of $328). Flying from Seattle to Philadelphia in December is currently the most expensive (average of $523). 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 SEA to PHL?
Find hourly flight availability from Seattle to Philadelphia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 23, 2026.
When flying from Seattle to Philadelphia, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
The best insider tips for Seattle to Philadelphia 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 Seattle to Philadelphia trip
Our travel experts
Reviews of airlines servicing Philadelphia
Get insights into the airlines that provide service to Philadelphia. 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 Philadelphia. Reviews last updated June 23, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines,Delta, andHawaiian Airlines from Seattle to Philadelphia to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.0
Overall
7.9
Boarding
8.1
Crew
8.5
Food
7.0
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Overall
7.9
Boarding
8.1
Crew
8.5
Food
7.0
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Overall
7.9
Boarding
8.1
Crew
8.5
Food
7.0
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Overall
7.9
Boarding
8.1
Crew
8.5
Food
7.0
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Overall
7.9
Boarding
8.1
Crew
8.5
Food
7.0
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Overall
7.9
Boarding
8.1
Crew
8.5
Food
7.0
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Related info for your journey
Find useful and relevant information for your journey from Seattle to Philadelphia. 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 Philadelphia?
Book flights to Philadelphia if you plan to visit one of these locationsWildwood
King of Prussia
Reading
Camden
Ocean City
Plymouth Meeting
Cherry Hill
Lewes
Wyomissing
Dewey Beach
Pottstown
Ephrata
Milford
Wildwood Crest
Dover
Elkton
Essington
Willow Grove
New Castle
Millville
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Seattle
Philadelphia flight routes
Popular flights
Alternative routes for Seattle to Philadelphia
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Philadelphia by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Seattle to Philadelphia by cabin class
Find flights from Seattle to Philadelphia, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Seattle and Philadelphia flights
Browse other Seattle and Philadelphia flight options. Last updated on June 23, 2026.
Other flights from Seattle
Browse through other flights departing from Seattle. Flights are based on user searches made on Cheapflights and were last updated on June 23, 2026.
Other flights to Philadelphia
Explore flights to Philadelphia departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on June 23, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 7 airlines flying from Seattle to Philadelphia
Discover the top 7 airlines that operate flights from Seattle to Philadelphia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$149 | Average$294 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$158 | Average$351 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$206 | Average$389 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$228 | Average$507 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$257 | Average$481 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$257 | Average$423 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$384 | Average$495 | FlexibilityNo cancel fee | On-time63% |