$65 Cheap Flights from Philadelphia (PHL) to Seattle (SEA)

View $65 flight on Thu, Nov 20, 2025Opens in a new window

Popular airlines from Philadelphia Intl. Airport (PHL) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Philadelphia to Seattle (PHL-SEA)

Prices were available within the past 7 days and start at $65 for one-way flights and $151 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, Nov 20 - Fri, Dec 5
PHL
Philadelphia
SEA
Seattle
$151 Roundtrip, found 1 day ago
$151
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Nov 20 from Philadelphia to Seattle, returning Fri, Dec 5, priced at $151 found 1 day ago
Frontier Airlines
Sat, Nov 15 - Wed, Nov 19
PHL
Philadelphia
SEA
Seattle
$183 Roundtrip, found 11 hours ago
$183
Roundtrip
found 11 hours ago
Select Frontier Airlines flight, departing Sat, Nov 15 from Philadelphia to Seattle, returning Wed, Nov 19, priced at $183 found 11 hours ago
Frontier Airlines
Sat, Nov 15 - Fri, Dec 5
PHL
Philadelphia
SEA
Seattle
$190 Roundtrip, found 1 day ago
$190
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sat, Nov 15 from Philadelphia to Seattle, returning Fri, Dec 5, priced at $190 found 1 day ago
Frontier Airlines
Sat, Nov 15 - Wed, Nov 19
PHL
Philadelphia
SEA
Seattle
$193 Roundtrip, found 11 hours ago
$193
Roundtrip
found 11 hours ago
Select Frontier Airlines flight, departing Sat, Nov 15 from Philadelphia to Seattle, returning Wed, Nov 19, priced at $193 found 11 hours ago
Frontier Airlines
Sat, Nov 15 - Fri, Dec 5
PHL
Philadelphia
SEA
Seattle
$193 Roundtrip, found 1 day ago
$193
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sat, Nov 15 from Philadelphia to Seattle, returning Fri, Dec 5, priced at $193 found 1 day ago
Frontier Airlines
Thu, Nov 20 - Fri, Nov 28
PHL
Philadelphia
SEA
Seattle
$199 Roundtrip, found 2 hours ago
$199
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Thu, Nov 20 from Philadelphia to Seattle, returning Fri, Nov 28, priced at $199 found 2 hours ago
United
Tue, Nov 11 - Sun, Nov 16
PHL
Philadelphia
SEA
Seattle
$199 Roundtrip, found 9 hours ago
$199
Roundtrip
found 9 hours ago
Select United flight, departing Tue, Nov 11 from Philadelphia to Seattle, returning Sun, Nov 16, priced at $199 found 9 hours ago
Southwest Airlines
Fri, Dec 5 - Fri, Dec 12
PHL
Philadelphia
SEA
Seattle
$208 Roundtrip, found 5 hours ago
$208
Roundtrip
found 5 hours ago
Select Southwest Airlines flight, departing Fri, Dec 5 from Philadelphia to Seattle, returning Fri, Dec 12, priced at $208 found 5 hours ago
Delta
Thu, Nov 27 - Fri, Dec 5
PHL
Philadelphia
SEA
Seattle
$213 Roundtrip, found 2 hours ago
$213
Roundtrip
found 2 hours ago
Select Delta flight, departing Thu, Nov 27 from Philadelphia to Seattle, returning Fri, Dec 5, priced at $213 found 2 hours ago
Alaska Airlines
Thu, Dec 4 - Sun, Dec 7
PHL
Philadelphia
SEA
Seattle
$218 Roundtrip, just found
$218
Roundtrip
just found
Select Alaska Airlines flight, departing Thu, Dec 4 from Philadelphia to Seattle, returning Sun, Dec 7, priced at $218 just found

Find the cheapest month to fly from Philadelphia (PHL) to Seattle (SEA)

November is typically the cheapest month to fly

From $145 - $404 per traveler.

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $234
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $234

Frequently asked questions

How much does a flight from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA) cost?
Secure a cheap one-way flight from $65 or cheap return flight from $151 from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA)?
November is the least expensive month to fly from PHL to SEA. Traveling during quieter months is often the key to finding a great deal.
Which airlines fly direct from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA)?
When heading out of Philadelphia Intl. Airport (PHL), you can get on a nonstop flight to Seattle - Tacoma Intl. Airport (SEA) with Alaska Airlines.
What is the cheapest airline that flies from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA)?
To find the cheapest airline flying from PHL to SEA, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA)?
On average, you can pick from 6 direct flights per week from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA). For more options, consider flights with layovers. Simply enter your details on Expedia and then set the filters to include one or more stops.
What are the most popular departure times for flights from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA)?
The 6 PM departures from PHL to SEA are the busiest. They can also be more expensive. If you're hoping to save money, pick a less crowded time to fly.
What day of the week has the most flights from PHL to SEA?
Jet off on a Friday if you're searching for the best choice of flights from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA).
What is the earliest flight from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA)?
Take the earliest flight at around 6:32PM UTC-5, departing from Philadelphia Intl. Airport (PHL). You'll be in the air for around 6h 23m, coming in to land at Seattle - Tacoma Intl. Airport (SEA) at approximately 9:55PM UTC-8.
How long does it take to fly from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA)?
Flights from PHL to SEA have an average travel time of 6 hours and 23 minutes. The total distance between the two is 2,400 mi.
What is the best time to fly from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA)?
Choose a flight from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA) that leaves before 3 PM to reduce the risk of cancellations. Departures after this hour are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Seattle from Philadelphia Intl. Airport (PHL)?
If you're traveling on a direct flight from Philadelphia Intl. Airport (PHL) to Seattle, Seattle - Tacoma Intl. Airport (SEA) is the only airport you can land at.
Is it cheaper to buy a plane ticket from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Booking your plane ticket from PHL to SEA shortly before your getaway is typically more expensive. But if there's some wiggle room with your departure dates and times, you could snag a cheap last-minute fare.
Is it cheaper to book a PHL to SEA flight and hotel package?
You can save money by booking a PHL to SEA flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage it all in one place. Once you've selected your preferred accommodations and flights, consider adding extras like car rentals, activities and tours.
Can I cancel or change the date of my flight from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA)?
In most instances, you can reschedule or cancel your PHL to SEA flight. However, additional charges may apply, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's guidelines and fees on flight changes, or if you'd like further information, go to our Customer Service portal.

Travel information

Origin airport
Philadelphia Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, JetBlue Airways, Southwest Airlines, Sun Country Airlines, United
Roundtrip price
$151
Distance
2371 mi
Average flight time
3 hours 19 mins

Book with confidence

Philadelphia to Seattle Flights

The cheapest times to fly from Philadelphia to Seattle

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Philadelphia to Seattle are during the month of November. You can find some of the cheapest flights from Philadelphia to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Philadelphia to Seattle

Sunday is one of the best days to book for cheap flights from Philadelphia to Seattle: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Philadelphia to Seattle

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Philadelphia to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $65 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Philadelphia to Seattle flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Philadelphia to Seattle airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Philadelphia to Seattle Flights

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