Cheap Flights from Seattle to Philadelphia International

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Flight deals from Seattle to Philadelphia International Airport

Looking for a cheap last-minute deal or the best return flight from Seattle to Philadelphia International Airport? If you want to travel next month, return fares start from R 3,113. 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 April.

Direct flights from Seattle to Philadelphia International

Seattle to Philadelphia: Flight information

The things to know before you go.
Cheapest flight foundR 1,274
Cheapest month to flyApril
Average flight time5 hrs, 17 mins
Most popular airlineAmerican Airlines
Average flights per week126

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 R 3,113. 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 17 minutes is the average flight time from Seattle to Philadelphia International.
American Airlines, British Airways and Alaska Airlines fly direct from Seattle to Philadelphia International.
As of March 2026, there are 126 flights per week flying from Seattle to Philadelphia International.
The cheapest month to fly from Seattle to Philadelphia International is usually April.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle to Philadelphia International Airport on Thursday, 16 April 2026.
Yes – the average flight time is 5 hours and 17 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.

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

  • Seattle's main airport is Seattle-Tacoma International Airport (SEA). Explore your options for leaving from this terminal when booking your flights from Seattle to Philadelphia International Airport (PHL).

  • Around 5 hours 10 minutes is the typical travel time on a direct Seattle to Philadelphia International Airport flight.

  • The timezone in Philadelphia is UTC-5, which is three hours ahead of Seattle. Philadelphia International Airport is located in Philadelphia.

  • There are 29 direct services a week between Seattle-Tacoma International Airport (SEA) and Philadelphia International Airport (PHL). This is the most popular route when departing from Seattle.

  • To ensure you catch your flight from Seattle to PHL, allow plenty of time to navigate the airport and find your gate. Turning up two hours ahead of international departures and an hour before domestic flights is the general travel rule.

  • July is a busy travel month. If you're taking off then or during a major holiday like Christmas, get there even earlier. Aim for at least two hours ahead for domestic flights and as much as four hours for international journeys.

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • You can find a direct flight from Seattle to Philadelphia International Airport (PHL) leaving from Seattle-Tacoma International Airport (SEA).

  • You'll have your choice of carriers that operate direct flights from Seattle to Philadelphia International Airport departing from SEA. Get on board with any of these:

  • American Airlines is the airline with the highest passenger demand for flights from SEA to PHL.

  • American Airlines leads the way in punctuality. An exceptional 85.0% of its departures on this route arrive as planned.

  • The journey from central Seattle to SEA takes about 35 minutes on public transport. If you ride-share, drive or take a taxi, you'll cover the 23 kilometres in 25 minutes or so, depending on traffic.

  • Want a leisurely start to your break? Stay near Seattle-Tacoma International Airport. Whether you have an early flight from Seattle to Philadelphia International Airport or prefer not to rush, these hotels have you covered:

  • Seattle-Tacoma International Airport scores high marks for its on-time performance. 80% of flights that take off from SEA arrive at their destination without delay.

Seattle Paine Field International Airport (PAE)

  • PAE is around 40 kilometres from central Seattle. It'll take 40 minutes or so to get to the airport if you're driving from the city centre. Public transport takes approximately 1 hour 30 minutes.

  • Start your holiday sooner with an additional night away from home. Before your Seattle to PHL flight, kick back in one of these hotels near Seattle Paine Field International Airport:

  • Flights from Seattle Paine Field International Airport have a proven record for punctuality, with 80% of them arriving on schedule.

About Philadelphia International Airport (PHL)

Getting from Philadelphia International Airport (PHL) to central Philadelphia

  • From Philadelphia International Airport, central Philadelphia is around 18 kilometres away. It takes about 20 minutes to get to the city centre by car.

  • If you're travelling on public transport, expect a journey time of roughly 30 minutes.

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

  • Currently, R 1,274 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 R 3,113. Remember fares may change due to demand at the time of booking.

  • Booking ahead of time is often the key to finding a cheap flight from Seattle to PHL. Fares tend to rise as demand increases, so the closer your departure date, the more expensive your ticket may be.

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

  • There's no need to search every day to find out if fares have dropped when you set up a Price Alert. We'll let you know as soon as there's a better deal on plane tickets from Seattle to PHL.

  • Tailor your travel plans using filters. Choose your arrival and departure times, total journey duration and airlines. You can also sort your results by 'Fastest,' 'Best' or 'Cheapest' flights from Seattle to Philadelphia International Airport.

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

  • Think about your travel style when planning the timing of your trip. December is the quietest month to visit Philadelphia. July is when most people book flights from Seattle to Philadelphia International Airport (PHL), which may be perfect if you're chasing more excitement.

  • When booking your Seattle to PHL plane ticket, consider the weather you're most comfortable in. July is the warmest month in Philadelphia, with temperatures ranging from 18ºC (64ºF) to 32ºC (90ºF).

  • Search for cheap tickets from Seattle to Philadelphia International Airport in January if you want to travel in cooler conditions. Temperatures are at their lowest then, ranging between -7ºC (19ºF) and 9ºC (48ºF).

More about Philadelphia

Explore more of the United States

  • Philadelphia has plenty going for it, but there are so many other corners of the United States just waiting to be discovered. Around 137 kilometres northeast of Philadelphia, a trip to New York will keep your itinerary packed. Check out popular attractions like Central Park, Statue of Liberty and Metropolitan Museum of Art.

  • If you're looking to explore another major destination in the United States, head for Baltimore, about 137 kilometres southwest of Philadelphia. National Aquarium, Baltimore Aquarium and Washington Monument and Mount Vernon Place are key highlights.

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