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Cheap Flights from Seattle / Tacoma International to Philadelphia

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Compare Seattle / Tacoma International to Philadelphia flight deals

Find the cheapest month or even day of the year to fly to Philadelphia

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Flight deals from Seattle / Tacoma International to Philadelphia

Looking for a cheap last-minute deal or the best round-trip flight from Seattle / Tacoma International to Philadelphia? Find the lowest prices on one-way and round-trip tickets right here.
Philadelphia.2.472.705 ₫ per passenger.Departing Tue, May 20.One-way flight with Spirit Airlines.Outbound indirect flight with Spirit Airlines, departing from Seattle / Tacoma International on Tue, May 20, arriving in Philadelphia International.Price includes taxes and charges.From 2.472.705 ₫, select.
Philadelphia.2.486.611 ₫ per passenger.Departing Tue, Jun 3.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Seattle / Tacoma International on Tue, Jun 3, arriving in Philadelphia International.Price includes taxes and charges.From 2.486.611 ₫, select.
Philadelphia.3.605.941 ₫ per passenger.Departing Tue, Jul 1.One-way flight with United.Outbound indirect flight with United, departing from Seattle / Tacoma International on Tue, Jul 1, arriving in Philadelphia International.Price includes taxes and charges.From 3.605.941 ₫, select.
Philadelphia.3.985.265 ₫ per passenger.Departing Wed, Aug 20.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departing from Seattle / Tacoma International on Wed, Aug 20, arriving in Philadelphia International.Price includes taxes and charges.From 3.985.265 ₫, select.
Philadelphia.4.060.715 ₫ per passenger.Departing Wed, Oct 15.One-way flight with Delta.Outbound indirect flight with Delta, departing from Seattle / Tacoma International on Wed, Oct 15, arriving in Philadelphia International.Price includes taxes and charges.From 4.060.715 ₫, select.
Philadelphia.4.518.744 ₫ per passenger.Departing Thu, Nov 20.One-way flight with United.Outbound indirect flight with United, departing from Seattle / Tacoma International on Thu, Nov 20, arriving in Philadelphia International.Price includes taxes and charges.From 4.518.744 ₫, select.
Philadelphia.4.669.053 ₫ per passenger.Departing Tue, Aug 12.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departing from Seattle / Tacoma International on Tue, Aug 12, arriving in Philadelphia International.Price includes taxes and charges.From 4.669.053 ₫, select.
Philadelphia.5.181.821 ₫ per passenger.Departing Mon, Sep 1.One-way flight with Delta.Outbound indirect flight with Delta, departing from Seattle / Tacoma International on Mon, Sep 1, arriving in Philadelphia International.Price includes taxes and charges.From 5.181.821 ₫, select.

When is the cheapest time to fly from Seattle / Tacoma International to Philadelphia?

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Seattle / Tacoma International to Philadelphia flights are currently cheapest in May.
Apr
from 8.615.262 ₫
May
from 2.472.705 ₫
Jun
from 2.486.611 ₫
Jul
from 3.605.941 ₫
Aug
from 3.985.265 ₫
Sep
from 5.181.821 ₫
Oct
from 4.060.715 ₫
Nov
from 4.518.744 ₫
Dec
Find prices
Jan
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Feb
Find prices
Mar
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Direct flights from Seattle / Tacoma International to Philadelphia

Alternative Seattle / Tacoma International to Philadelphia routes

Looking for the cheapest, fastest or easiest route from Seattle / Tacoma International to Philadelphia? You could fly into the following airports instead.

Seattle to Philadelphia: Flight information

The things to know before you go.
Cheapest flight found2.472.705 ₫
Cheapest month to flyMay
Average flight time5 hrs, 11 mins
Most popular airlineAmerican Airlines
Average flights per week83

Finding cheap flights from Seattle / Tacoma International to Philadelphia: Frequently asked questions

There are 6 airports in Philadelphia: Philadelphia International, Blue Bell, Philadelphia Trenton-Mercer, Greater Wilmington, Atlantic City International, and Allentown.
The best price we found for a round-trip flight from Seattle / Tacoma International to Philadelphia is 5.197.884 ₫. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
5 hours and 11 minutes is the average flight time from Seattle / Tacoma International to Philadelphia.
American Airlines, Air Tahiti Nui and Hawaiian Airlines fly direct from Seattle / Tacoma International to Philadelphia.
There are 83 flights per week flying from Seattle / Tacoma International to Philadelphia, as of April 2025.
The cheapest month to fly from Seattle / Tacoma International to Philadelphia is usually April 2025.
If you're flying from Seattle / Tacoma International Airport, the cheapest airport near Philadelphia is Philadelphia International – which is 11.2 km away from the center of Philadelphia. We've found flights to this airport from 5.197.884 ₫.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Seattle / Tacoma International Airport to Philadelphia on Tuesday, June 3, 2025.
Yes – the average flight time is 5 hours and 11 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Philadelphia but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to Philadelphia is around 40 days in advance, so don’t leave your flight to the last minute.
In April, the average temperature is usually around 10°C. July is typically the warmest month in Philadelphia, when it usually averages around 30°C. You can expect the least rain in February. The coldest month is January, with temperatures averaging -5°C. The rainiest month is July.
Currently, Frontier Airlines and American Airlines offer the cheapest flight tickets to Philadelphia.

How to find cheap flights to Philadelphia from Seattle / Tacoma International

Looking for cheap tickets from Seattle / Tacoma International to Philadelphia? Here are a few tips on how to secure the best flight price and make your journey as smooth as possible.

  • Simply hit "search." From Delta Air Lines to international carriers like Emirates, we compare all major airlines along with the most popular online travel agents to find the cheapest plane tickets from Seattle / Tacoma International to Philadelphia. And with us, there are no hidden fees – what you see is what you pay.
  • Compare flight deals to Philadelphia from Seattle / Tacoma International from over 1,000 providers. Then choose the cheapest plane tickets or fastest journeys.
  • Flex your dates to find the best Seattle / Tacoma International–Philadelphia ticket prices. If you're flexible when it comes to your travel dates, use Skyscanner's "Whole month" tool to find the cheapest month, and even day to fly to Philadelphia from Seattle / Tacoma International.
  • Set up a Price Alert. You can easily track the fare of your cheap Seattle / Tacoma International–Philadelphia flights by creating an alert. Whenever prices go down or up, you'll get an email or push notification to help make sure you get the best possible flight deal.
  • Fly without stops. Only interested in direct flights between Seattle / Tacoma International and Philadelphia? Make sure to tick "Direct flights only" when performing a search. If there are direct flights available on the route, these will appear in the results.
  • Find the cheapest Business Class flights from Seattle / Tacoma International and Philadelphia. We scour the Internet for the best Business, Premium Economy and First Class flight fares to Philadelphia, too. Check the difference in price as you search – you might just stumble on a last-minute low fare. Note that not all cabin classes are available for every destination or airline.
  • Include nearby airports in your search. Widen your search for Seattle / Tacoma International to Philadelphia flight deals by selecting the "add nearby airports" option. This will allow you to see flight prices for all the nearest airports at your departure point and your destination and could help you save the next time you travel.

    • Combine your flight to Philadelphia from Seattle / Tacoma International with hotels and car rental

    Once you've secured your cheap flight ticket from Seattle / Tacoma International to Philadelphia, discover the best prices and exclusive rates for hotels in Philadelphia or nearby. You can also compare hundreds of car rental companies at once so you get the best car rental price for your trip.


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Plan the rest of your trip from Seattle to Philadelphia

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.