$129 Cheap Flights from Seattle (SEA) to Philadelphia (PHL)

View $129 flight on Mon, Nov 24, 2025Opens in a new window

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

Today's featured flight deals from Seattle-Tacoma International Airport (SEA) to Philadelphia Intl. Airport (PHL)

Nonstop
Carry-on included
Lower price than typical

Cheap Flights from Seattle to Philadelphia (SEA-PHL)

Prices were available within the past 7 days and start at $129 for one-way flights and $233 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Tue, Jan 20 - Mon, Jan 26
SEA
Seattle
PHL
Philadelphia
$233 Roundtrip, found 5 days ago
$233
Roundtrip
found 5 days ago
Select American Airlines flight, departing Tue, Jan 20 from Seattle to Philadelphia, returning Mon, Jan 26, priced at $233 found 5 days ago
Alaska Airlines
Fri, Dec 5 - Sat, Dec 6
SEA
Seattle
PHL
Philadelphia
$251 Roundtrip, found 2 hours ago
$251
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Fri, Dec 5 from Seattle to Philadelphia, returning Sat, Dec 6, priced at $251 found 2 hours ago
Alaska Airlines
Thu, Dec 11 - Sat, Dec 13
SEA
Seattle
PHL
Philadelphia
$257 Roundtrip, just found
$257
Roundtrip
just found
Select Alaska Airlines flight, departing Thu, Dec 11 from Seattle to Philadelphia, returning Sat, Dec 13, priced at $257 just found
American Airlines
Tue, Nov 4 - Tue, Nov 18
SEA
Seattle
PHL
Philadelphia
$257 Roundtrip, found 1 hour ago
$257
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Tue, Nov 4 from Seattle to Philadelphia, returning Tue, Nov 18, priced at $257 found 1 hour ago
Frontier Airlines
Fri, Oct 10 - Fri, Oct 24
SEA
Seattle
PHL
Philadelphia
$261 Roundtrip, found 3 days ago
$261
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Fri, Oct 10 from Seattle to Philadelphia, returning Fri, Oct 24, priced at $261 found 3 days ago
American Airlines
Fri, Feb 20 - Tue, Feb 24
SEA
Seattle
PHL
Philadelphia
$265 Roundtrip, found 8 hours ago
$265
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Fri, Feb 20 from Seattle to Philadelphia, returning Tue, Feb 24, priced at $265 found 8 hours ago
United
Fri, Feb 20 - Tue, Feb 24
SEA
Seattle
PHL
Philadelphia
$268 Roundtrip, found 8 hours ago
$268
Roundtrip
found 8 hours ago
Select United flight, departing Fri, Feb 20 from Seattle to Philadelphia, returning Tue, Feb 24, priced at $268 found 8 hours ago
American Airlines
Fri, Feb 20 - Mon, Feb 23
SEA
Seattle
PHL
Philadelphia
$269 Roundtrip, found 7 hours ago
$269
Roundtrip
found 7 hours ago
Select American Airlines flight, departing Fri, Feb 20 from Seattle to Philadelphia, returning Mon, Feb 23, priced at $269 found 7 hours ago
Delta
Fri, Dec 5 - Sat, Dec 6
SEA
Seattle
PHL
Philadelphia
$271 Roundtrip, found 2 hours ago
$271
Roundtrip
found 2 hours ago
Select Delta flight, departing Fri, Dec 5 from Seattle to Philadelphia, returning Sat, Dec 6, priced at $271 found 2 hours ago
United
Mon, Dec 15 - Tue, Dec 16
SEA
Seattle
PHL
Philadelphia
$272 Roundtrip, found 2 hours ago
$272
Roundtrip
found 2 hours ago
Select United flight, departing Mon, Dec 15 from Seattle to Philadelphia, returning Tue, Dec 16, priced at $272 found 2 hours ago

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

March is typically the cheapest month to fly

From $146 - $410 per traveler.

Alternative airports near Philadelphia

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

Select flight to New Castle ILG. Average driving time to city center is 44 minutes. Flights from $497
ILG
New Castle
Average driving time to city center44 min
Flights from $497

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL) cost?
Grab a cheap one-way flight from $129 or cheap return flight from $233 from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL)?
January is the most affordable month to fly from SEA to PHL. Avoiding peak travel times is often the key to finding better fares.
Which airlines fly direct from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL)?
You can fly nonstop from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL) on an Alaska Airlines flight.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL)?
To find the cheapest airline flying from SEA to PHL, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to see the most affordable options first.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL)?
On average, you can pick from 6 direct flights each week from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL). To expand your choices, consider a flight with a layover. Just enter your details on Expedia and then set the filter tool to include one or more stops.
What are the most popular departure times for flights from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL)?
More passengers fly between SEA and PHL at 9 AM than at any other time of day. Looking for a quieter experience? Travel outside of rush hours and you're likely to save on your fare as well.
What day of the week has the most flights from SEA to PHL?
Friday offers the most flights from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL). Consider leaving on this day and you'll have a greater chance of finding a departure that fits your schedule.
What is the earliest flight from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL)?
The earliest flight out of Seattle - Tacoma Intl. Airport (SEA) is at around 9:15AM UTC-8. Catch this flight and you'll reach Philadelphia Intl. Airport (PHL) at approximately 5:32PM UTC-5. The total time in the air is 5h 17m.
How long does it take to fly from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL)?
Flights from SEA to PHL have an average travel time of 5 hours and 17 minutes. The total distance between the two airports is 2,400 mi.
What airline has the least delays from SEA to PHL?
American Airlines has the best track record for on-time direct flights from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL), with an on-time score of 82%. Use the Expedia App to see your flight status before you take off and receive notifications about any trip changes.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL)?
To avoid potential delays on the Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL) route, aim to travel before 3 PM. Departures after this hour have a 22% higher chance of cancellation.**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 Philadelphia from Seattle - Tacoma Intl. Airport (SEA)?
Check out your flight options from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL). This is the only airport in Philadelphia you can fly into if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL) last-minute?
Last-minute fares from SEA to PHL are usually more expensive. For the best prices, start searching for flights well ahead of time. That being said, if you can play around with your travel dates, it's possible to find a cheap fare just before your departure.
Is it cheaper to book a SEA to PHL flight and hotel package?
Securing a SEA to PHL flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels in one place. Pick from our extensive range of hotels and then add car rentals, flights and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL)?
In most cases, you can modify or cancel your SEA to PHL 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 policies and fees on flight changes, or if you need further information, head to our Customer Service portal.

Travel information

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Philadelphia Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, JetBlue Airways, Southwest Airlines, Sun Country Airlines, United
Roundtrip price
$233
Distance
2371 mi
Average flight time
9 hours 9 mins

Book with confidence

Book with confidence

Seattle to Philadelphia Flights

The cheapest times to fly from Seattle to Philadelphia

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 Seattle to Philadelphia are during the month of January. You can find some of the cheapest flights from Seattle to Philadelphia with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Philadelphia

Sunday is one of the best days to book for cheap flights from Seattle to Philadelphia: 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 Seattle to Philadelphia

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 Seattle to Philadelphia in 2025. You can also book with separate airlines for your outbound and return journeys, from $129 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 Seattle to Philadelphia 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 Seattle to Philadelphia 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.

 

Seattle to Philadelphia Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.