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

View AU$238 flight on Sat, 7 Nov 2026Opens in a new window

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

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

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Tue, 28 July - Tue, 4 Aug
SEA
Seattle
PHL
Philadelphia
AU$550 Return, found 4 days ago
AU$550
Return
found 4 days ago
Select American Airlines flight, departing Tue, 28 July from Seattle to Philadelphia, returning Tue, 4 Aug, priced at AU$550 found 4 days ago
American Airlines
Tue, 28 July - Tue, 4 Aug
SEA
Seattle
PHL
Philadelphia
AU$574 Return, found 4 days ago
AU$574
Return
found 4 days ago
Select American Airlines flight, departing Tue, 28 July from Seattle to Philadelphia, returning Tue, 4 Aug, priced at AU$574 found 4 days ago
American Airlines
Tue, 28 July - Tue, 4 Aug
SEA
Seattle
PHL
Philadelphia
AU$589 Return, found 4 days ago
AU$589
Return
found 4 days ago
Select American Airlines flight, departing Tue, 28 July from Seattle to Philadelphia, returning Tue, 4 Aug, priced at AU$589 found 4 days ago
American Airlines
Tue, 28 July - Tue, 4 Aug
SEA
Seattle
PHL
Philadelphia
AU$598 Return, found 4 days ago
AU$598
Return
found 4 days ago
Select American Airlines flight, departing Tue, 28 July from Seattle to Philadelphia, returning Tue, 4 Aug, priced at AU$598 found 4 days ago
American Airlines
Tue, 28 July - Tue, 4 Aug
SEA
Seattle
PHL
Philadelphia
AU$604 Return, found 4 days ago
AU$604
Return
found 4 days ago
Select American Airlines flight, departing Tue, 28 July from Seattle to Philadelphia, returning Tue, 4 Aug, priced at AU$604 found 4 days ago
Delta
Tue, 28 July - Tue, 4 Aug
SEA
Seattle
PHL
Philadelphia
AU$613 Return, found 4 days ago
AU$613
Return
found 4 days ago
Select Delta flight, departing Tue, 28 July from Seattle to Philadelphia, returning Tue, 4 Aug, priced at AU$613 found 4 days ago
American Airlines
Tue, 28 July - Tue, 4 Aug
SEA
Seattle
PHL
Philadelphia
AU$614 Return, found 4 days ago
AU$614
Return
found 4 days ago
Select American Airlines flight, departing Tue, 28 July from Seattle to Philadelphia, returning Tue, 4 Aug, priced at AU$614 found 4 days ago
American Airlines
Tue, 28 July - Tue, 4 Aug
SEA
Seattle
PHL
Philadelphia
AU$623 Return, found 4 days ago
AU$623
Return
found 4 days ago
Select American Airlines flight, departing Tue, 28 July from Seattle to Philadelphia, returning Tue, 4 Aug, priced at AU$623 found 4 days ago
American Airlines
Tue, 28 July - Tue, 4 Aug
SEA
Seattle
PHL
Philadelphia
AU$627 Return, found 4 days ago
AU$627
Return
found 4 days ago
Select American Airlines flight, departing Tue, 28 July from Seattle to Philadelphia, returning Tue, 4 Aug, priced at AU$627 found 4 days ago
American Airlines
Tue, 28 July - Tue, 4 Aug
SEA
Seattle
PHL
Philadelphia
AU$628 Return, found 4 days ago
AU$628
Return
found 4 days ago
Select American Airlines flight, departing Tue, 28 July from Seattle to Philadelphia, returning Tue, 4 Aug, priced at AU$628 found 4 days ago

Frequently asked questions

How much does a flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.) cost?
You can find one-way and return flights from SEA to PHL with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when SEA to PHL ticket fares go up or down.
What is the cheapest month to fly from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
The cheapest months to fly from SEA to PHL are typically during off-peak season when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you are able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
There are 4 airlines offering direct flights from Seattle - Tacoma Intl. (SEA) to Philadelphia Intl. (PHL). Here are some of the top carriers:
  • American Airlines operates 22 direct flights from SEA to PHL every week.
  • Delta operates 7 direct flights from SEA to PHL every week.
  • Finnair operates 7 direct flights from SEA to PHL every week.
  • United operates 7 direct flights from SEA to PHL every week.
How do I find cheap flights from Seattle, WA (SEA) to Philadelphia, PA (PHL)?
To find a cheap flight from Seattle, WA (SEA) to Philadelphia, PA (PHL), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
The best airline to fly with from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.) will differ from traveler to traveler. If you like to fly early, Alaska Airlines offers early morning flights. If price is the most important factor, Delta typically offers the lowest fares. Southwest Airlines offers the most daily flights from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.), which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
How many flights per day from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
You'll find approximately 4 nonstop flights per day from Seattle - Tacoma Intl. (SEA) to Philadelphia Intl. (PHL). For even more choices, look at flights that include layovers, as there are around 124 connecting flights per day. Some common connection points include O'Hare Intl. (ORD), Denver Intl. (DEN), and Sky Harbor Intl. (PHX).
What is the earliest flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
The earliest flight from Seattle - Tacoma Intl. (SEA) to Philadelphia Intl. (PHL) typically departs around 12:05 AM local time. This service is operated by American Airlines. Please note that this is a seasonal service, active only in February. An early departure like this can be great for maximizing your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
You'll typically find the most flights from Seattle - Tacoma Intl. (SEA) to Philadelphia Intl. (PHL) on a Friday, with around 80 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include United, American Airlines, and Alaska Airlines. Fridays offer notably more flight options compared to other days of the week, making it a great day to find a flight that suits your schedule.
What are the most popular departure times for flights from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
The most popular departure times for flights from Seattle - Tacoma Intl. (SEA) to Philadelphia Intl. (PHL) are in the late evening, from 9pm to midnight. Many major carriers, including American Airlines, Alaska Airlines and Delta, offer flights during this window. Many travellers prefer this timing because it allows you to make the most of your day in Seattle before your flight, and you'll arrive in Philadelphia ready to start your day.
How long does it take to fly from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
When flying from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.), you have a few options for flight duration. A non-stop flight typically takes around 5 hours 18 minutes, covering a distance of approximately 3,817 kilometers. If you opt for a one-stop flight, your travel time will be longer, usually around 7 hours 48 minutes. Flights with two or more stops will take even longer, with a typical duration of about 11 hours. Keep in mind that actual flight times can vary due to factors like wind patterns and air traffic, so it's always a good idea to factor in some extra time when planning your journey.
Can you fly business or first class from Seattle, WA (SEA-Seattle - Tacoma Intl.) to Philadelphia, PA (PHL-Philadelphia Intl.)?
Yes, you can fly business class or first class between SEA and PHL. Airlines that offer business class service on this route include:
  • Frontier Airlines
  • Delta
First class cabins are available on Alaska Airlines, United, Delta, and American Airlines.
How do I earn miles on a Seattle, WA (SEA) to Philadelphia, PA (PHL) flight with Expedia?
It's easy to earn miles on a Seattle, WA (SEA) to Philadelphia, PA (PHL) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Philadelphia, PA (PHL) from Seattle, WA (SEA)?
If you're planning to travel to Philadelphia from Seattle - Tacoma Intl. (SEA), you can fly directly into Philadelphia Intl. (PHL). Some flights may connect through major hubs like San Francisco Intl. (SFO), Los Angeles Intl. (LAX), or Harry Reid International Airport (LAS) before reaching Philadelphia. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Seattle, WA (SEA) to Philadelphia, PA (PHL) at the last minute?
Typically, booking a last minute flight from Seattle, WA (SEA) to Philadelphia, PA (PHL) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Seattle, WA (SEA) to Philadelphia, PA (PHL) flight and hotel package?
Securing a Seattle, WA (SEA) to Philadelphia, PA (PHL) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals 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, WA (SEA) to Philadelphia, PA (PHL)?
If you booked your Seattle, WA (SEA) to Philadelphia, PA (PHL) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Philadelphia Intl.
Return price
AU$549
Distance
3794 km
Average flight time
9 hours 4 mins

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Your quick guide to flights from Seattle to Philadelphia

Pick up great flights from Seattle to Philadelphia

With Expedia, you have your pick of flights a day with 20 airlines covering flights from Seattle to Philadelphia. Whether you’re on a business trip, a family holiday or a luxury break, just enter your travel dates, hit search then check out your choice of flights. Select from return, one way or multi-city flights, and use the advance search tool if you want a direct or refundable flight. You can narrow your search to show you just your preferred cabin class and airline, too. It’s all easy. You can book direct flights from Seattle to Philadelphia that take around hours.

Find cheap flights from Seattle to Philadelphia

From the great flight deals with prices currently ranging from AU$550 to AU$628, you can choose to see the cheapest flights first. Generally, you can book the cheapest flights from Seattle to Philadelphia around 4 to 6 weeks in advance. If your travel dates are flexible, try to avoid weekends and peak seasons – when you are more likely to grab the lowest prices. Even last minute, there are some impressive deals. The cheapest time to fly to Philadelphia is normally in July.

Reasons to book your flight from Seattle to Philadelphia with Expedia

Expedia makes it easy to find, book, and travel, with everything you need all in one place. When you enter your travel details, find fantastic deals just for you on flight tickets from Seattle to Philadelphia across all the main airline carriers, so you can save time, dollars, and hassle finding the perfect flight. If you think your plans could change, choose refundable flights so any changes won’t cost you more. Book your flight to Philadelphia right now and, if you join Expedia Rewards, you earn points this time and every time you travel with Expedia.

Your quick guide to flights from Seattle to Philadelphia

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