Fly Across the Country: PHL to SEA Flight Deals & Guide
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$144.58
Last updated Feb 15, 2026
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Tracking the May 7, 2026 departure — the cheapest date we found.
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Philadelphia (PHL)
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Seattle (SEA)
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Search FlightsEmbarking on a journey from the historic streets of Philadelphia to the lush, tech-forward landscape of Seattle is an exciting transcontinental adventure that spans nearly 2,400 miles. Whether you are traveling for business in the "Emerald City" or seeking a vacation amidst the Pacific Northwest's stunning natural beauty, the flight from Philadelphia International Airport (PHL) to Seattle-Tacoma International Airport (SEA) offers a gateway to diverse experiences. This route connects two major cultural hubs, taking travelers from the birthplace of American democracy to the home of the Space Needle and the global coffee revolution. With several major airlines offering direct and connecting services, finding a flight that fits your schedule and budget is easier than ever, allowing you to transition from the East Coast to the West Coast in roughly six hours of flight time.
Travel Tips
1. Prepare for the time difference: Seattle is three hours behind Philadelphia, so try to adjust your sleep schedule a few days before departure to minimize jet lag. 2. Pack layers: While Philadelphia has distinct seasons, Seattle is known for its unpredictable "mist" and cooler temperatures, even in summer, so a waterproof light jacket is essential. 3. Download entertainment: Since this is a long-haul domestic flight lasting around 5.5 to 6 hours, ensure your devices are fully charged and you have downloaded movies or books, as Wi-Fi availability can vary by aircraft. 4. Arrive early: PHL can experience heavy security lines during peak morning hours, so aim to be at the terminal at least two hours before your scheduled departure to avoid any stress.
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.
Seasonal Pricing Patterns
Generally, the most expensive time to fly from PHL to SEA is during the peak summer months of July and August when the weather in Washington state is most favorable and dry. Conversely, you can find the lowest fares during the late winter and early spring, specifically February and March, though you should expect rainier conditions upon arrival. Mid-week flights on Tuesdays or Wednesdays typically offer better value than weekend departures.
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.