Looking for more low-fare flights?
Check out the Low Fare Calendar to find a fare that works for you. Just choose the month you want to depart and return, and we’ll show you the best fares available.
Find low faresSouthwest® flights from Seattle/Tacoma to Philadelphia from $139
expand_more
1 Passenger
expand_morePromo Code
expand_moretoday
today
Low fares from Seattle/Tacoma to Philadelphia
$
Seattle/Tacoma (SEA)to
Philadelphia (PHL)
Depart: 05/02/2026
One-way
Basic
From
$138
Seen: 10 hrs ago
Seattle/Tacoma (SEA)to
Philadelphia (PHL)
Depart: 03/24/2026
One-way
Basic
From
$139
Seen: 8 hrs ago
Seattle/Tacoma (SEA)to
Philadelphia (PHL)
Depart: 02/26/2026
One-way
Basic
From
$166
Seen: 15 hrs ago
Seattle/Tacoma (SEA)to
Philadelphia (PHL)
Depart: 04/17/2026
One-way
Basic
From
$169
Seen: 15 hrs ago
Seattle/Tacoma (SEA)to
Philadelphia (PHL)
Depart: 02/27/2026
One-way
Basic
From
$169
Seen: 22 hrs ago
Seattle/Tacoma (SEA)to
Philadelphia (PHL)
Depart: 05/02/2026
One-way
Choice
From
$170
Seen: 10 hrs ago
Explore flights from Seattle/Tacoma to Philadelphia
location_on
location_on
Flight Details
Departing from:
Seattle/Tacoma International Airport
Arriving at:
Philadelphia International Airport
Distance:
2378 miles
Route Information
62† Weekly flights
† Weekly flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025. Note: route may not operate every day of the week.
‡ Nonstop flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025.
Questions we hear the most
There are 62 weekly flights from Seattle/Tacoma to Philadelphia on Southwest Airlines.
To find the lowest fares by day and time to fly Seattle/Tacoma to Philadelphia with Southwest, check out our Low Fare Calendar.
You can rent a car at Philadelphia International Airport book yours with your flight.
Yes! Flights from Seattle/Tacoma to Philadelphia—or from here or there to anywhere—can be changed with no change fees. Fare difference may apply.
Check the status of your upcoming Southwest flight.
Check out the Southwest Airlines® Help Center for answers about everything Southwest.