$134 Cheap Flights from Seattle (SEA) to Philadelphia (PHL)

View $134 flight on Thu, Nov 27, 2025Opens in a new window

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

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Cheap Flights from Seattle to Philadelphia (SEA-PHL)

Prices were available within the past 7 days and start at $134 for one-way flights and $268 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Aug 27 - Sat, Sep 6
SEA
Seattle
PHL
Philadelphia
$268 Roundtrip, found 5 hours ago
$268
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Wed, Aug 27 from Seattle to Philadelphia, returning Sat, Sep 6, priced at $268 found 5 hours ago
Delta
Tue, Nov 4 - Wed, Nov 5
SEA
Seattle
PHL
Philadelphia
$271 Roundtrip, found 12 hours ago
$271
Roundtrip
found 12 hours ago
Select Delta flight, departing Tue, Nov 4 from Seattle to Philadelphia, returning Wed, Nov 5, priced at $271 found 12 hours ago
Alaska Airlines
Fri, Oct 24 - Sat, Oct 25
SEA
Seattle
PHL
Philadelphia
$271 Roundtrip, found 1 hour ago
$271
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Fri, Oct 24 from Seattle to Philadelphia, returning Sat, Oct 25, priced at $271 found 1 hour ago
Southwest Airlines
Tue, Oct 28 - Sat, Nov 1
SEA
Seattle
PHL
Philadelphia
$272 Roundtrip, found 5 hours ago
$272
Roundtrip
found 5 hours ago
Select Southwest Airlines flight, departing Tue, Oct 28 from Seattle to Philadelphia, returning Sat, Nov 1, priced at $272 found 5 hours ago
Bargain Flight
Wed, Nov 12 - Tue, Nov 18
SEA
Seattle
PHL
Philadelphia
$273 Roundtrip, found 1 hour ago
$273
Roundtrip
found 1 hour ago
Select Bargain Flight flight, departing Wed, Nov 12 from Seattle to Philadelphia, returning Tue, Nov 18, priced at $273 found 1 hour ago
United
Wed, Oct 29 - Fri, Oct 31
SEA
Seattle
PHL
Philadelphia
$274 Roundtrip, found 10 hours ago
$274
Roundtrip
found 10 hours ago
Select United flight, departing Wed, Oct 29 from Seattle to Philadelphia, returning Fri, Oct 31, priced at $274 found 10 hours ago
Southwest Airlines
Wed, Sep 17 - Tue, Sep 23
SEA
Seattle
PHL
Philadelphia
$277 Roundtrip, just found
$277
Roundtrip
just found
Select Southwest Airlines flight, departing Wed, Sep 17 from Seattle to Philadelphia, returning Tue, Sep 23, priced at $277 just found
United
Wed, Sep 17 - Tue, Sep 23
SEA
Seattle
PHL
Philadelphia
$277 Roundtrip, just found
$277
Roundtrip
just found
Select United flight, departing Wed, Sep 17 from Seattle to Philadelphia, returning Tue, Sep 23, priced at $277 just found
Hawaiian Airlines
Wed, Dec 10 - Sat, Dec 13
SEA
Seattle
PHL
Philadelphia
$277 Roundtrip, found 2 days ago
$277
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Wed, Dec 10 from Seattle to Philadelphia, returning Sat, Dec 13, priced at $277 found 2 days ago
American Airlines
Sat, Oct 4 - Tue, Oct 7
SEA
Seattle
PHL
Philadelphia
$277 Roundtrip, just found
$277
Roundtrip
just found
Select American Airlines flight, departing Sat, Oct 4 from Seattle to Philadelphia, returning Tue, Oct 7, priced at $277 just found

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

September is typically the cheapest month to fly

From $141 - $274 per traveler.

Graph displaying average flight prices per month

Alternative airports near Philadelphia

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

Select flight to Philadelphia Intl. PHL. Cheapest and Closest option available. Average driving time to city center is 17 minutes. Flights from $539
PHL
Philadelphia Intl.
CheapestClosest
Average driving time to city center17 min
Flights from $539
Flights from Seattle (SEA) to Philadelphia (PHL)
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
$268
Distance
2371 mi
Average flight time
8 hours 38 mins

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 August. 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 $134 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.

 

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 $134 or cheap return flight from $268 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)?
August 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.

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