Cheap Flights from Seattle to Philadelphia International

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Flight deals from Seattle to Philadelphia International

Looking for a cheap last-minute deal or the best return flight from Seattle to Philadelphia International? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Seattle to Philadelphia International

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

Direct flights from Seattle to Philadelphia International

Seattle to Philadelphia International: Alternative routes

Compare routes from Seattle to Philadelphia below. You may find an airport to fly into that's cheaper, faster, or easier than Philadelphia International.

Seattle to Philadelphia: Flight information

The things to know before you go.
Cheapest flight foundRs38,081
Cheapest month to flyOctober
Average flight time5 hrs, 13 mins
Most popular airlineAmerican Airlines
Average flights per week56

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

The best price we found for a return flight from Seattle to Philadelphia International is Rs47,349. 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 13 minutes is the average flight time from Seattle to Philadelphia International.
American Airlines, Hawaiian Airlines and Alaska Airlines fly direct from Seattle to Philadelphia International.
As of August 2025, there are 56 flights per week flying from Seattle to Philadelphia International.
The cheapest month to fly from Seattle to Philadelphia International is usually September.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle to Philadelphia International Airport on Friday, 26 September 2025.
Yes – the average flight time is 5 hours and 13 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 International 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.

Travelling from Seattle to Philadelphia International Airport (PHL): What you need to know

  • Seattle's main airport is Seattle-Tacoma International Airport (SEA). Check out your options for departing from this base when booking your flights from Seattle to Philadelphia International Airport (PHL).

  • Hop on a direct Seattle to Philadelphia International Airport flight and you'll be travelling for around 5 hours 10 minutes.

  • The timezone in Philadelphia is UTC-4, which is three hours ahead of Seattle. Philadelphia International Airport is located in Philadelphia.

  • The busiest route is from Seattle-Tacoma International Airport (SEA) to Philadelphia International Airport (PHL), with 21 direct services every week. If you want to be on your way right away, the earliest flight from SEA to PHL is the 8:30am Alaska Airlines option. If you prefer travelling later, the last departure is at 11:52pm with American Airlines.

  • Arriving two hours before an international flight and one hour ahead of a domestic departure are golden rules for stress-free travel. Be at the airport with enough time to board your flight from Seattle to PHL.

  • Longer lines at security and check-in are likely if you're jetting off during high season, so allow a bit more breathing room. The recommendation for peak periods? Arrive up to four hours early for international flights and two hours for domestic departures.

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • Seattle-Tacoma International Airport (SEA) provides a hassle-free way to reach your destination. Nonstop flights from Seattle to Philadelphia International Airport (PHL) operate out of this terminal.

  • You can get away on a direct flight from Seattle to Philadelphia International Airport with Alaska Airlines. This top carrier offers services from SEA.

  • The top choice among passengers flying between SEA and PHL is Alaska Airlines.

  • The carrier with the top on-time arrival performance on this route is American Airlines.

  • Located around 23 kilometres from central Seattle, SEA can be reached in about 20 minutes by car, depending on traffic. The journey by public transport will take roughly 55 minutes.

  • Want a leisurely start to your holiday? Stay near Seattle-Tacoma International Airport. Whether you're catching an early flight from Seattle to Philadelphia International Airport or prefer not to rush, these hotels are just what you're after:

  • Seattle-Tacoma International Airport has an excellent on-time performance, so you're less likely to experience disruptions. Departures from SEA land at their destination as scheduled 81.27% of the time.

Lake Union Sea Plane Base Airport (LKE)

  • You can arrive at LKE from the centre of Seattle in about 10 minutes by car (depending on traffic). The journey by public transport will take roughly 25 minutes to cover the 3 kilometres or so.

  • Get a head start on your holiday with an extra night away from home. Before your Seattle to PHL flight, kick back in one of these hotels near Lake Union Sea Plane Base Airport:

About Philadelphia International Airport (PHL)

Getting from Philadelphia International Airport (PHL) to central Philadelphia

  • Central Philadelphia is about 11 kilometres from Philadelphia International Airport. Travel times by cab or car hire will vary depending on traffic conditions and time of day, so do some research before your trip.

  • It takes around 45 minutes to get there using public transport.

How to find the cheapest flights from Seattle to Philadelphia International Airport (PHL)

  • At the moment, Rs38,081 is the lowest price we've found for a one-way ticket from Seattle to Philadelphia International Airport. The cheapest price for a return flight is Rs47,349. Remember fares may change due to demand at the time of booking.

  • Don't leave everything to the last minute. You're more likely to find cheap flights from Seattle to PHL if you book in advance. Airlines often have some great early bird discounts.

  • Cheap Seattle to Philadelphia International Airport tickets are easier to find when your dates are flexible. Use the 'Whole month' tool to compare fares across every month and then fly out on the cheapest day.

  • Be the first to know about deals for flight tickets from Seattle to PHL by setting up a Price Alert. We'll send you an email or push notification on the app when a new discounted fare appears.

  • Filters make it easier to dig up a deal for your flight from Seattle to Philadelphia International Airport. Pick the airlines, flight times and number of stops that look good to you. Then sort the results by 'Cheapest' to find the best price quickly.

The best time to fly from Seattle to Philadelphia International Airport (PHL)

  • February is the quietest month for flights from Seattle to Philadelphia International Airport (PHL), while August is the most popular. Work out the ideal time to visit Philadelphia based on whether you want a lively atmosphere or a more laid-back vibe.

  • Lock in a Seattle to PHL flight ticket departing in July if you're eager to visit the city during its warmest month. Expect temperatures in Philadelphia to range from 18ºC to 32ºC.

  • January has temperatures of between -7ºC and 9ºC. Look for cheap tickets from Seattle to Philadelphia International Airport around that time if you like cooler conditions.

More about Philadelphia

Explore more of the United States

  • Philadelphia is always a good idea, but there are so many other parts of the United States you should also see. Around 137 kilometres north-east of Philadelphia, a visit to New York will keep you on the go. Check out popular attractions like Central Park, Manhattan Skyline and Statue of Liberty.

  • Around 137 kilometres south-west of Philadelphia, Baltimore is another essential stop in the United States. Experience the best of this destination with a visit to Baltimore Aquarium, National Aquarium and Washington Monument and Mount Vernon Place.

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