$161+ 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 5/29. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
Jun 10 — Jun 171
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 Wednesday 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 May 11, 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 May 11, 2026.
This Delta deal was found by Cheapflights users on 5/6. 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 6/179:25 am
SEA
- PHL
Nonstop5h 10m
Delta
Mon 6/226:45 pm
PHL
- SEA
Nonstop6h 14m
Delta
Deal found 5/6![Delta logo]()
$329
This Expedia deal was found by Cheapflights users on 5/8. 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.
Mon 8/247:41 pm
SEA
- PHL
1 stop13h 06m
Multiple Airlines
Sat 8/296:04 pm
PHL
- SEA
Nonstop5h 54m
Multiple Airlines
Deal found 5/8![Multiple Airlines logo]()
$330
This Alaska Airlines deal was found by Cheapflights users on 5/7. 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 6/69:22 pm
SEA
- PHL
Nonstop5h 13m
Alaska Airlines
Sun 6/77:00 am
PHL
- SEA
Nonstop5h 59m
Alaska Airlines
Deal found 5/7![Alaska Airlines logo]()
$332
This Delta deal was found by Cheapflights users on 5/6. 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 5/289:20 pm
SEA
- PHL
Nonstop5h 17m
Delta
Sun 5/317:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 5/6![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.
Wed 6/249:25 am
SEA
- PHL
Nonstop5h 10m
Delta
Tue 6/306:45 pm
PHL
- SEA
Nonstop6h 14m
Delta
Deal found 5/9![Delta logo]()
$334
This Gotogate deal was found by Cheapflights users on 5/7. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/298:20 pm
SEA
- PHL
1 stop31h 01m
Frontier
Sun 5/318:35 pm
PHL
- SEA
1 stop16h 31m
Frontier
Deal found 5/7![Frontier logo]()
$335
This American Airlines deal was found by Cheapflights users on 5/8. 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 6/1712:46 pm
SEA
- PHL
Nonstop5h 22m
American Airlines
Mon 6/226:17 pm
PHL
- SEA
Nonstop6h 18m
American Airlines
Deal found 5/8![American Airlines logo]()
$336
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.
Sat 5/309:22 pm
SEA
- PHL
Nonstop5h 13m
Alaska Airlines
Tue 6/27:00 am
PHL
- SEA
Nonstop5h 59m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$337
This American Airlines deal was found by Cheapflights users on 5/8. 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 6/510:35 pm
SEA
- PHL
Nonstop5h 12m
American Airlines
Sun 6/147:35 pm
PHL
- SEA
Nonstop6h 23m
American Airlines
Deal found 5/8![American Airlines logo]()
$338
This Delta deal was found by Cheapflights users on 5/6. 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 6/179:25 am
SEA
- PHL
Nonstop5h 10m
Delta
Thu 7/96:55 pm
PHL
- SEA
1 stop8h 04m
Delta
Deal found 5/6![Delta logo]()
$339
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 5/258:20 pm
SEA
- PHL
1 stop31h 01m
Multiple Airlines
Thu 5/287:00 am
PHL
- SEA
Nonstop5h 59m
Multiple Airlines
Deal found 5/10![Multiple Airlines logo]()
$340
This Orbitz 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/283:19 pm
SEA
- PHL
1 stop11h 18m
Multiple Airlines
Sun 5/317:00 am
PHL
- SEA
Nonstop5h 59m
Multiple Airlines
Deal found 5/10![Multiple Airlines logo]()
$342
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 May 11, 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 May 11, 2026.
This Delta deal was found by Cheapflights users on 5/6. 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 10/229:50 pm
SEA
- PHL
Nonstop5h 13m
Delta
Sun 10/257:05 am
PHL
- SEA
Nonstop6h 19m
Delta
Deal found 5/6![Delta logo]()
$329
This Alaska Airlines deal was found by Cheapflights users on 5/7. 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 6/69:22 pm
SEA
- PHL
Nonstop5h 13m
Alaska Airlines
Sun 6/77:00 am
PHL
- SEA
Nonstop5h 59m
Alaska Airlines
Deal found 5/7![Alaska Airlines logo]()
$332
This Southwest deal was found by Cheapflights users on 5/5. 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 7/2411:05 pm
SEA
- PHL
1 stop12h 05m
Southwest
Sat 8/158:55 am
PHL
- SEA
1 stop11h 05m
Southwest
Deal found 5/5![Southwest logo]()
$354
This Delta deal was found by Cheapflights users on 5/5. 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 6/299:25 am
SEA
- PHL
Nonstop5h 10m
Delta
Thu 7/26:45 pm
PHL
- SEA
Nonstop6h 14m
Delta
Deal found 5/5![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/115:30 am
SEA
- PHL
1 stop8h 15m
Southwest
Sat 6/134:50 pm
PHL
- SEA
2 stops11h 20m
Southwest
Deal found 5/7![Southwest logo]()
$354
This Delta deal was found by Cheapflights users on 5/6. 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 6/59:20 am
SEA
- PHL
Nonstop5h 15m
Delta
Mon 6/86:45 pm
PHL
- SEA
Nonstop6h 14m
Delta
Deal found 5/6![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 5/7. 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 6/3011:05 pm
SEA
- PHL
1 stop10h 05m
Southwest
Tue 7/144:35 pm
PHL
- SEA
2 stops10h 55m
Southwest
Deal found 5/7![Southwest logo]()
$360
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 6/19:20 pm
SEA
- PHL
Nonstop5h 15m
Delta
Mon 6/226:45 pm
PHL
- SEA
Nonstop6h 14m
Delta
Deal found 5/10![Delta logo]()
$333
This Delta deal was found by Cheapflights users on 5/6. 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 5/289:20 pm
SEA
- PHL
Nonstop5h 17m
Delta
Sun 5/317:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 5/6![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 6/169:25 am
SEA
- PHL
Nonstop5h 10m
Delta
Sun 6/216:45 pm
PHL
- SEA
Nonstop6h 14m
Delta
Deal found 5/9![Delta logo]()
$339
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.
Fri 5/295:45 pm
SEA
- PHL
1 stop9h 25m
Delta
Sun 5/317:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 5/9![Delta logo]()
$343
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.
Sat 5/309:20 pm
SEA
- PHL
Nonstop5h 17m
Delta
Tue 6/27:25 am
PHL
- SEA
1 stop10h 56m
Delta
Deal found 5/9![Delta logo]()
$347
Last-minute flights from Seattle to PhiladelphiaDiscover last-minute flight deals from Seattle to Philadelphia. Data last updated May 11, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Philadelphia. Data last updated May 11, 2026 and is based on user searches.
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 5/258:20 pm
SEA
- PHL
1 stop31h 01m
Multiple Airlines
Thu 5/287:00 am
PHL
- SEA
Nonstop5h 59m
Multiple Airlines
Deal found 5/10![Multiple Airlines logo]()
$340
This Delta deal was found by Cheapflights users on 5/6. 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 5/289:20 pm
SEA
- PHL
Nonstop5h 17m
Delta
Sun 5/317:10 am
PHL
- SEA
Nonstop5h 50m
Delta
Deal found 5/6![Delta logo]()
$333
This Orbitz 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/283:19 pm
SEA
- PHL
1 stop11h 18m
Multiple Airlines
Sun 5/317:00 am
PHL
- SEA
Nonstop5h 59m
Multiple Airlines
Deal found 5/10![Multiple Airlines logo]()
$342
This Delta deal was found by Cheapflights users on 5/6. 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 5/289:20 pm
SEA
- PHL
Nonstop5h 17m
Delta
Mon 6/16:45 pm
PHL
- SEA
1 stop8h 25m
Delta
Deal found 5/6![Delta logo]()
$343
This Gotogate deal was found by Cheapflights users on 5/7. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/298:20 pm
SEA
- PHL
1 stop31h 01m
Frontier
Sun 5/318:35 pm
PHL
- SEA
1 stop16h 31m
Frontier
Deal found 5/7![Frontier logo]()
$335
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.
Sat 5/309:22 pm
SEA
- PHL
Nonstop5h 13m
Alaska Airlines
Tue 6/27:00 am
PHL
- SEA
Nonstop5h 59m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$337
This American Airlines deal was found by Cheapflights users on 5/8. 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 6/510:35 pm
SEA
- PHL
Nonstop5h 12m
American Airlines
Sun 6/147:35 pm
PHL
- SEA
Nonstop6h 23m
American Airlines
Deal found 5/8![American Airlines logo]()
$338
This Alaska Airlines deal was found by Cheapflights users on 5/7. 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 6/69:22 pm
SEA
- PHL
Nonstop5h 13m
Alaska Airlines
Sun 6/77:00 am
PHL
- SEA
Nonstop5h 59m
Alaska Airlines
Deal found 5/7![Alaska Airlines logo]()
$332
This Delta deal was found by Cheapflights users on 5/6. 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 6/179:25 am
SEA
- PHL
Nonstop5h 10m
Delta
Mon 7/66:45 pm
PHL
- SEA
Nonstop6h 14m
Delta
Deal found 5/6![Delta logo]()
$329
This American Airlines deal was found by Cheapflights users on 5/8. 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 6/1712:46 pm
SEA
- PHL
Nonstop5h 22m
American Airlines
Mon 6/226:17 pm
PHL
- SEA
Nonstop6h 18m
American Airlines
Deal found 5/8![American Airlines logo]()
$336
This Delta deal was found by Cheapflights users on 5/6. 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 6/179:25 am
SEA
- PHL
Nonstop5h 10m
Delta
Thu 7/96:55 pm
PHL
- SEA
1 stop8h 04m
Delta
Deal found 5/6![Delta logo]()
$339
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 6/249:25 am
SEA
- PHL
Nonstop5h 10m
Delta
Tue 6/306:45 pm
PHL
- SEA
Nonstop6h 14m
Delta
Deal found 5/9![Delta logo]()
$334
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 May 11, 2026.
Search for one-way flight options from Seattle to Philadelphia. Find affordable one-way fares based on user searches. Data last updated May 11, 2026.
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/293:19 pm
SEA
- PHL
1 stop11h 18m
Frontier
Deal found 5/9![Frontier logo]()
$161
This Delta deal was found by Cheapflights users on 5/8. 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 7/39:25 am
SEA
- PHL
Nonstop5h 10m
Delta
Deal found 5/8![Delta logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 5/6. 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 5/277:50 pm
SEA
- PHL
2 stops17h 48m
Frontier
Deal found 5/6![Frontier logo]()
$167
This Kiwi.com deal was found by Cheapflights users on 5/8. 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 6/88:20 pm
SEA
- PHL
2 stops23h 09m
Frontier
Deal found 5/8![Frontier logo]()
$168
This Delta deal was found by Cheapflights users on 5/6. 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 6/19:20 pm
SEA
- PHL
Nonstop5h 15m
Delta
Deal found 5/6![Delta logo]()
$169
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.
Mon 6/2210:35 pm
SEA
- PHL
Nonstop5h 12m
American Airlines
Deal found 5/9![American Airlines logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 5/7. 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 5/317:50 pm
SEA
- PHL
2 stops19h 50m
Frontier
Deal found 5/7![Frontier logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 5/6. 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 6/307:41 pm
SEA
- PHL
2 stops35h 49m
Frontier
Deal found 5/6![Frontier logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 5/7. 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 6/17:50 pm
SEA
- PHL
1 stop30h 47m
Frontier
Deal found 5/7![Frontier logo]()
$178
This Southwest deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:00 am
SEA
- PHL
1 stop8h 50m
Southwest
Deal found 5/8![Southwest logo]()
$179
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 May 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $329 (Delta) |
One-way from | $161 (Frontier) |
Popular in | December |
Cheapest in | October |
Average price | $428 |
Good round-trip deal | $405 or less |
Good one-way deal | $191 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 May 11, 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 10/22
9:50 pm-6:03 am
Nonstop5h 13m
Philadelphia
Sun 10/25
7:05 am-10:24 am
Nonstop6h 19m
$329
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Mon 6/29
9:25 am-5:35 pm
Nonstop5h 10m
Philadelphia
Thu 7/2
6:45 pm-9:59 pm
Nonstop6h 14m
$329
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 6/5
9:20 am-5:35 pm
Nonstop5h 15m
Philadelphia
Mon 6/8
6:45 pm-9:59 pm
Nonstop6h 14m
$329
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Sat 6/6
9:22 pm-5:35 am
Nonstop5h 13m
Philadelphia
Sun 6/7
7:00 am-9:59 am
Nonstop5h 59m
$332
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Mon 6/1
9:20 pm-5:35 am
Nonstop5h 15m
Philadelphia
Mon 6/22
6:45 pm-9:59 pm
Nonstop6h 14m
$333
Quickest round-trip
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 5/28
9:20 pm-5:37 am
Nonstop5h 17m
Philadelphia
Sun 5/31
7:10 am-10:00 am
Nonstop5h 50m
$333
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Tue 6/16
9:25 am-5:35 pm
Nonstop5h 10m
Philadelphia
Sun 6/21
6:45 pm-9:59 pm
Nonstop6h 14m
$339
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 5/29
5:45 pm-6:10 am
1 stop9h 25m
Philadelphia
Sun 5/31
7:10 am-10:00 am
Nonstop5h 50m
$343
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Sat 5/30
9:20 pm-5:37 am
Nonstop5h 17m
Philadelphia
Tue 6/2
7:25 am-3:21 pm
1 stop10h 56m
$347
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 7/24
11:05 pm-2:10 pm
1 stop12h 05m
Philadelphia
Sat 8/15
8:55 am-5:00 pm
1 stop11h 05m
$354
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 May.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy1 star | 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
More
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 $327). Flying from Seattle to Philadelphia in December is currently the most expensive (average of $527). 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 May 11, 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.
What’s the top layover airport for flights from Seattle to Philadelphia?
Share of 1-stop round-trip flights from Seattle to Philadelphia chosen by Cheapflights users in the past 12 months, using the same layover each way.
Chicago (MDW) – chosen by Cheapflights users on 67% of 1-stop itineraries from Seattle to Philadelphia on Cheapflights.
What’s the cheapest layover airport for flights from Seattle to Philadelphia?
Average round-trip fare for 1-stop flights from Seattle to Philadelphia, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Las Vegas (LAS) is the most affordable 1-stop option, with an average round-trip price of $306.
What’s the fastest layover option from Seattle to Philadelphia?
Shortest average travel time for 1-stop one-way flights from Seattle to Philadelphia, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Chicago (MDW) have the shortest average one-way travel time for 1-stop routes: 7h 30m.
Which airport typically offers the quickest layover for flights from Seattle to Philadelphia?
Average layover duration for 1-stop one-way flights from Seattle to Philadelphia, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Chicago (MDW) offer the fastest connection on this route, with an average layover time of 1h 18m.
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 May 11, 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.
Food
7.0
Comfort
7.8
Crew
8.5
Boarding
8.1
Entertainment
7.0
Overall
7.9
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Food
7.0
Comfort
7.8
Crew
8.5
Boarding
8.1
Entertainment
7.0
Overall
7.9
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Food
7.0
Comfort
7.8
Crew
8.5
Boarding
8.1
Entertainment
7.0
Overall
7.9
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Food
7.0
Comfort
7.8
Crew
8.5
Boarding
8.1
Entertainment
7.0
Overall
7.9
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Food
7.0
Comfort
7.8
Crew
8.5
Boarding
8.1
Entertainment
7.0
Overall
7.9
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Food
7.0
Comfort
7.8
Crew
8.5
Boarding
8.1
Entertainment
7.0
Overall
7.9
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
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
Lewes
Dewey Beach
Pottstown
Vineland
Ephrata
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Millville
Glen Mills
Chester
Newark
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 May 11, 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 May 11, 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 May 11, 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 May 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$147 | Average$294 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$148 | Average$330 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$206 | Average$377 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$223 | Average$507 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$257 | Average$504 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$257 | Average$428 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$376 | Average$495 | FlexibilityNo cancel fee | On-time63% |