฿5,305 Cheap Flights from Seattle (SEA) to Philadelphia (PHL)

View ฿5,305 flight on Fri, 5 Jun 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 and start at ฿5,305 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

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

April is typically the cheapest month to fly

From ฿6,071 - ฿13,798 per traveller.

Frequently asked questions

How much is a flight from Seattle - Tacoma Intl. Airport (SEA) to PHL?
The lowest price advertised for a round-trip journey between SEA and Philadelphia Airport is . But you better act fast. This price is taken from fares quoted within the last 7 days on Expedia for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from SEA to Philadelphia Airport?
Most flights can be cancelled online, but each airline has different terms and conditions. If you do decide to cancel your flight, go to our Customer Service Portal and follow the instructions.
How do I find cheap flights from SEA to PHL that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for SEA to Philadelphia Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL)?
You'll be soaring through the sky for a while, as the flight distance from SeaTac to Philadelphia is 3,800 kilometres. Put together a playlist of your favourite songs before leaving home to keep yourself entertained during the journey.
Which airlines fly direct from Seattle - Tacoma Intl. Airport (SEA) to Philadelphia Intl. Airport (PHL)?
Alaska Airlines (AS) is a top choice. It operates 30 flights from Sea-Tac Airport to Philadelphia Intl. Airport (PHL) each month. Love some more options? Check out the ticket prices from American Airlines (AA). This carrier offers 30 flights a month between these destinations.
Are Sea-Tac Airport to PHL flight tickets cheaper when they're purchased at the last minute?
Flight tickets from SEA to PHL are available up to a year prior to departure on Expedia. And although you may pick up a fantastic last-minute deal, it's never something you can count on. Also, booking your flights well in advance means you'll have more choices — and you can avoid getting caught in the dreaded middle seat! We regularly update our fares to bring you the biggest bargains, so keep checking in for all the latest specials.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Philadelphia Intl.
Distance
3794 km
Average flight time
8 hours 19 mins
*Available to Expedia members.