S$294 Cheap Flights from Seattle to Philadelphia

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.

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.

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.

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.

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.

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.