Fly Across the Country: PHL to SEA Flight Deals & Guide
Cheapest flight found
$186
Last updated Mar 13, 2026
Prices by Month
Price History
Tracking the May 7, 2026 departure — the cheapest date we found.
Price Behavior: PHL → SEA
Based on 6 months of fare data collected by Trip Manta.
Lowest Fare
$186
Highest Fare
$333
Median Fare
$230
Price Spread
$147
Prices vary significantly — hourly tracking is especially valuable here.
Cheapest month to fly: May 2026 (from $186)
Most expensive month: April 2026 (from $333)
Biggest price drop caught: $54 between consecutive checks
Most frequent cheapest airline: Southwest
What This Means for You
Flights from Philadelphia to Seattle range from $186 to $333, a $147 spread across the months we track. If your dates are flexible, May 2026 tends to have the lowest fares. Because prices on this route change significantly, setting up hourly price alerts gives you the best chance of catching a short-lived drop before it corrects. We have caught drops as large as $54 between hourly checks on this route.
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From
Philadelphia (PHL)
To
Seattle (SEA)
Airport Information
Philadelphia (PHL)
Philadelphia International Airport (PHL) serves as a primary hub for the Delaware Valley and is a major base for American Airlines. Located just seven miles from downtown, it features seven terminals and a wide array of dining options that highlight local favorites like Philly cheesesteaks. The airport is easily accessible via the SEPTA Regional Rail, making it convenient for travelers coming from Center City or the surrounding suburbs.
Seattle (SEA)
Seattle-Tacoma International Airport (SEA), commonly referred to as Sea-Tac, is the largest airport in the Pacific Northwest and serves as a primary hub for Alaska Airlines and Delta Air Lines. Situated between Seattle and Tacoma, the airport offers seamless connections to the city via the Link Light Rail. Visitors can enjoy an impressive collection of public art, diverse Pacific Northwest-inspired cuisine, and live musical performances throughout the terminals.
Frequently Asked Questions
Which airlines offer direct flights from PHL to SEA?
American Airlines and Alaska Airlines are the primary carriers offering non-stop service on this route, providing convenient options for travelers.
How long is the flight from Philadelphia to Seattle?
A non-stop flight typically takes between 5 hours and 45 minutes to 6 hours and 15 minutes, depending on wind patterns and weather conditions.
What is the best way to get from Sea-Tac to downtown Seattle?
The Link Light Rail is a cost-effective and efficient way to reach downtown, with trains departing frequently and taking about 40 minutes.
Is there a significant price difference between direct and connecting flights?
Often, connecting flights through hubs like Chicago O'Hare or Denver can save money, but they typically add 2-4 hours to the total travel time compared to direct flights.
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Our Methodology
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