Cheap Flights from Seattle to Philadelphia

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Travellers and cabin class, 1 Adult, Economy

Compare Seattle to Philadelphia flight deals

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

Book the best Philadelphia fare with no extra fees

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Flight deals from Seattle to Philadelphia

Looking for a cheap last-minute deal or the best return flight from Seattle to Philadelphia? If you want to travel next month, return fares start from CHF 205. Find the lowest prices on one-way and return tickets right here.

Philadelphia.CHF 114 per passenger.Departing Fri, 16 Oct.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Fri, 16 Oct, arriving in Philadelphia International.Price includes taxes and charges.From CHF 114, select.

Philadelphia.CHF 129 per passenger.Departing Mon, 9 Nov.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Mon, 9 Nov, arriving in Philadelphia International.Price includes taxes and charges.From CHF 129, select.

Philadelphia.CHF 136 per passenger.Departing Mon, 8 Feb.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Seattle / Tacoma International on Mon, 8 Feb, arriving in Philadelphia International.Price includes taxes and charges.From CHF 136, select.

Philadelphia.CHF 136 per passenger.Departing Tue, 22 Dec.One-way flight with United.Outbound indirect flight with United, departs from Seattle / Tacoma International on Tue, 22 Dec, arriving in Philadelphia International.Price includes taxes and charges.From CHF 136, select.

Philadelphia.CHF 136 per passenger.Departing Sat, 23 Jan.One-way flight with United.Outbound indirect flight with United, departs from Seattle / Tacoma International on Sat, 23 Jan, arriving in Philadelphia International.Price includes taxes and charges.From CHF 136, select.

Philadelphia.CHF 138 per passenger.Departing Mon, 21 Sep.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Mon, 21 Sep, arriving in Philadelphia International.Price includes taxes and charges.From CHF 138, select.

Philadelphia.CHF 163 per passenger.Departing Wed, 10 Mar.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Seattle / Tacoma International on Wed, 10 Mar, arriving in Philadelphia International.Price includes taxes and charges.From CHF 163, select.

Philadelphia.CHF 169 per passenger.Departing Tue, 6 Jul.One-way flight with Delta.Outbound direct flight with Delta departs from Seattle / Tacoma International on Tue, 6 Jul, arriving in Philadelphia International.Price includes taxes and charges.From CHF 169, select.

Philadelphia.CHF 169 per passenger.Departing Tue, 15 Jun.One-way flight with Delta.Outbound direct flight with Delta departs from Seattle / Tacoma International on Tue, 15 Jun, arriving in Philadelphia International.Price includes taxes and charges.From CHF 169, select.

Philadelphia.CHF 177 per passenger.Departing Fri, 13 Nov.One-way flight with Delta.Outbound direct flight with Delta departs from Seattle / Tacoma International on Fri, 13 Nov, arriving in Philadelphia International.Price includes taxes and charges.From CHF 177, select.

Philadelphia.CHF 177 per passenger.Departing Thu, 14 Jan.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Seattle / Tacoma International on Thu, 14 Jan, arriving in Philadelphia International.Price includes taxes and charges.From CHF 177, select.

Philadelphia.CHF 177 per passenger.Departing Fri, 23 Oct.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Seattle / Tacoma International on Fri, 23 Oct, arriving in Philadelphia International.Price includes taxes and charges.From CHF 177, select.

Philadelphia.CHF 177 per passenger.Departing Fri, 25 Sep.One-way flight with Delta.Outbound direct flight with Delta departs from Seattle / Tacoma International on Fri, 25 Sep, arriving in Philadelphia International.Price includes taxes and charges.From CHF 177, select.

Philadelphia.CHF 186 per passenger.Departing Thu, 24 Dec.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Seattle / Tacoma International on Thu, 24 Dec, arriving in Philadelphia International.Price includes taxes and charges.From CHF 186, select.

Philadelphia.CHF 601 per passenger.Departing Thu, 15 Apr.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from Paine Field on Thu, 15 Apr, arriving in Philadelphia Trenton-Mercer.Price includes taxes and charges.From CHF 601, select.

Find the cheapest month to fly from Seattle to Philadelphia

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Seattle to Philadelphia flights are currently cheapest in October.

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Direct flights from Seattle to Philadelphia

Alternative Seattle to Philadelphia routes

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

Seattle to Philadelphia: Flight information

The things to know before you go.

Cheapest flight found	CHF 114
Cheapest month to fly	October
Average flight time	5 hrs, 13 mins
Most popular airline	American Airlines
Average flights per week	81

Finding cheap flights from Seattle to Philadelphia: Frequently asked questions

How many airports are there in Philadelphia?

There are 5 airports in Philadelphia: Philadelphia International, Philadelphia Trenton-Mercer, Greater Wilmington, Atlantic City International, and Allentown.

How much are return flights from Seattle to Philadelphia?

The best price we found for a return flight from Seattle to Philadelphia is CHF 205. 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.

How long does it take to fly from Seattle to Philadelphia?

5 hours and 13 minutes is the average flight time from Seattle to Philadelphia.

Which airlines fly direct from Seattle to Philadelphia?

American Airlines, Qatar Airways and Alaska Airlines fly direct from Seattle to Philadelphia.

How many flights are there a week from Seattle to Philadelphia?

As of September 2026, there are 81 flights per week flying from Seattle to Philadelphia.

When is the cheapest time to fly from Seattle to Philadelphia?

The cheapest month to fly from Seattle to Philadelphia is usually October.

Which is the cheapest airport to fly into in Philadelphia?

If you're flying from Seattle, the cheapest airport near Philadelphia is Philadelphia International – which is 11.2 km away from the centre of Philadelphia. We've found flights into this airport from CHF 205.

Which upcoming date is cheapest to fly from Seattle to Philadelphia on?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle to Philadelphia on Friday, 9 October 2026.

Can I get a direct flight from Seattle to Philadelphia?

Yes – the average flight time is 5 hours and 13 minutes.

How can I get the best flight deal from Seattle to Philadelphia?

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.

When is the best time to book flights to Philadelphia?

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.

What’s the weather like in Philadelphia?

In September, the average temperature is usually around 21°C. July is typically the warmest month in Philadelphia, when it usually averages around 31°C. You can expect the least rain in November. The coldest month is January, with temperatures averaging -1°C. The rainiest month is July.

Which is the cheapest airline to fly from Seattle to Philadelphia with?

The cheapest airline that flies to Philadelphia is Frontier Airlines. And the cheapest airline that flies to Philadelphia Trenton-Mercer Airport is Delta.

How to find cheap flights to Philadelphia from Seattle

Looking for cheap tickets from Seattle 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 British Airways 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 to Philadelphia. And with us there are no hidden fees - what you see is what you pay.
Compare flight deals to Philadelphia from Seattle from over 1,000 providers. Then choose the cheapest or fastest plane tickets.
Flex your dates to find the best Seattle-Philadelphia ticket prices. If you are 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.
Set up a Price Alert. You can easily track the fare of your cheap Seattle-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 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 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 chance upon 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 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 next time you travel.

Combine your flight to Philadelphia from Seattle with hotels and car hire

Once you've secured your cheap flight ticket from Seattle to Philadelphia, discover the best prices and exclusive rates for hotels in Philadelphia or nearby. You can also compare hundreds of car hire companies in one go so that you get the best car hire price for your trip.