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Cheap Flights from Philadelphia International to Seattle

Compare Philadelphia International to Seattle flight deals

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

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Flight deals from Philadelphia International to Seattle

Looking for a cheap last-minute deal or the best return flight from Philadelphia International to Seattle? Find the lowest prices on one-way and return tickets right here.
Seattle.R 2,009 per passenger.Departing Thu, 14 Aug.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Thu, 14 Aug, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,009, select.
Seattle.R 2,095 per passenger.Departing Fri, 6 Jun.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Fri, 6 Jun, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,095, select.
Seattle.R 2,095 per passenger.Departing Sun, 27 Jul.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Sun, 27 Jul, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,095, select.
Seattle.R 2,196 per passenger.Departing Sat, 31 May.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Sat, 31 May, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,196, select.
Seattle.R 2,215 per passenger.Departing Sat, 6 Sep.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Sat, 6 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,215, select.
Seattle.R 2,612 per passenger.Departing Sat, 4 Oct.One-way flight with Spirit Airlines.Outbound indirect flight with Spirit Airlines, departs from Philadelphia International on Sat, 4 Oct, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,612, select.
Seattle.R 2,625 per passenger.Departing Sun, 31 Aug.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Philadelphia International on Sun, 31 Aug, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,625, select.
Seattle.R 2,733 per passenger.Departing Thu, 18 Sep.One-way flight with Hawaiian Airlines.Outbound direct flight with Hawaiian Airlines departs from Philadelphia International on Thu, 18 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,733, select.

Find the cheapest month to fly from Philadelphia International to Seattle

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Philadelphia International to Seattle flights are currently cheapest in August.
May
from R 2,196
Jun
from R 2,095
Jul
from R 2,095
Aug
from R 2,009
Sep
from R 2,215
Oct
from R 2,612
Nov
from R 2,825
Dec
from R 2,847
Jan
Find prices
Feb
from R 2,844
Mar
from R 2,845
Apr
Find prices

Direct flights from Philadelphia International to Seattle

Alternative Philadelphia International to Seattle routes

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

Philadelphia to Seattle: Flight information

The things to know before you go.
Cheapest flight foundR 2,009
Cheapest month to flyAugust
Average flight time6 hrs, 5 mins
Most popular airlineAmerican Airlines
Average flights per week71

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

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.
The best price we found for a return flight from Philadelphia International to Seattle is R 3,681. 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.
6 hours and 5 minutes is the average flight time from Philadelphia International to Seattle.
American Airlines, Air Tahiti Nui and Qatar Airways fly direct from Philadelphia International to Seattle.
As of May 2025, there are 71 flights per week flying from Philadelphia International to Seattle.
The cheapest month to fly from Philadelphia International to Seattle is usually May 2025.
If you're flying from Philadelphia International Airport, the cheapest airport near Seattle is Seattle / Tacoma International – which is 19.5 km away from the centre of Seattle. We've found flights into this airport from R 3,681.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Philadelphia International Airport to Seattle on Saturday, 7 June 2025.
Yes – the average flight time is 6 hours and 5 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 Seattle 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 Seattle is around 40 days in advance, so don’t leave your flight to the last minute.
In May, the average temperature is usually around 12°C. August is typically the warmest month in Seattle, when it usually averages around 23°C. You can expect the least rain in July. The coldest month is December, with temperatures averaging 0°C. The rainiest month is November.
Currently, Frontier Airlines and Hawaiian Airlines offer the cheapest flight tickets to Seattle.

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

  • Book a direct flight from Philadelphia International Airport to Seattle and you'll be in the air for an average of 5 hours 10 minutes.

  • The timezone in Seattle is UTC-7. The city is three hours behind Philadelphia, where Philadelphia International Airport is located.

  • With 21 weekly flights between the two airports, Philadelphia International Airport (PHL) to Seattle-Tacoma International Airport (SEA) is the busiest route. Alaska Airlines operates the earliest flight at 06:45. If you prefer to make the most of your day before taking off, the latest departure from PHL to SEA is with American Airlines at 19:10.

  • Leave enough time to catch your PHL to Seattle flight. It's generally best to arrive at least two hours before international departures and an hour ahead for domestic flights.

  • Heading off during a peak time like a bank holiday? Expect longer lines at check-in and security. To be on the safe side, arrive up to four hours before international flights and two hours ahead of domestic departures.

  • Direct Philadelphia International Airport to Seattle tickets are available for booking. Seattle-Tacoma International Airport (SEA) is where you'll disembark.

  • Keep an eye out for offers from Alaska Airlines. This airline has direct flights from Philadelphia International Airport to Seattle.

  • Travelling from central Philadelphia to PHL takes about 45 minutes by public transport. If you ride-share, drive or grab a cab, you'll cover the 11 kilometres in 15 minutes or so, depending on traffic.

  • Searching for a hotel close to PHL? If you're catching an early flight from Philadelphia International Airport to Seattle, these accommodation options set you up for a seamless send-off:

  • Of all flights leaving Philadelphia International Airport, 78.93% land on schedule at their destination.

  • PHL is located at 8500 Essington Ave.

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

  • The best price we've found for a one-way Philadelphia International Airport to Seattle flight is R 2,009. The cheapest price for a return flight is R 3,681. Bear in mind fares can change due to demand at the time of booking.

  • Get cheap flights from PHL to Seattle by booking one month ahead. According to our research, that's the best time for picking up a bargain.

  • The best month for finding cheap Philadelphia International Airport to Seattle tickets is May. Use the 'Whole month' tool to compare flight prices, then choose the dates with the lowest fares.

  • You don't need to check every day to see if fares have dropped when you set up a Price Alert. We'll notify you the moment there's an even better deal on cheap flights from PHL to Seattle.

  • Choose your ideal arrival and departure times, airlines and number of stops with our filters. Then, sort the results for your flight from Philadelphia International Airport to Seattle by 'Cheapest,' 'Best' or 'Fastest.'

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • The distance from Seattle-Tacoma International Airport (SEA) to central Seattle is roughly 23 kilometres. It'll take you around 20 minutes to reach the centre driving.

  • Travelling to the centre on public transport takes around 55 minutes.

  • The last thing you want is a lengthy journey to your hotel if you're landing late on a flight from Philadelphia International Airport to Seattle. Check in to one of these accommodation options near SEA instead:

  • Grab a Seattle-Tacoma International Airport rental car and explore Seattle and beyond with your own set of wheels. Thrifty, Europcar and Budget are top outlets you can book with here.

  • Booking your vehicle from Seattle-Tacoma International Airport around one week before your flight from PHL to Seattle can help you secure the lowest rate.

Lake Union Sea Plane Base Airport (LKE)

  • Once your flight from Philadelphia International Airport to Seattle has touched down, you can reach the city centre in about 10 minutes by car. Central Seattle is roughly 3 kilometres from Lake Union Sea Plane Base Airport (LKE).

  • If you travel by public transport, the journey will take you 25 minutes or so.

  • Hang the 'Do not disturb' sign on your door and relax at a hotel close to LKE. Here are a few options where you can tuck yourself in after your PHL to Seattle flight:

Best time to go to Seattle

  • Carefully consider your dates before booking your flight from Philadelphia International Airport to Seattle. The city buzzes in high season, but hotel prices are usually higher and major attractions can get busy. Plan your trip to Seattle in low season if you like a quieter vibe.

  • The warmest month in Seattle is August, with temperatures ranging between 12ºC (54ºF) and 28ºC (82ºF). Lock in your Philadelphia International Airport to Seattle flight ticket then if you enjoy this type of weather.

  • Search for cheap tickets from PHL to Seattle in February if you'd rather travel during cooler conditions. Temperatures are at their lowest then, ranging between -1ºC (30ºF) and 11ºC (52ºF) on average.

More about Seattle

  • Start your Seattle trip off on the right foot by choosing the ideal place to stay. As soon as you've booked your flight from Philadelphia International Airport to Seattle, explore our range of hotels including:

  • LMN Architects and Greyhound: Bus Station are a couple of big attractions to add to your Seattle itinerary. Continue your sightseeing adventures at Boeing Radiation Effects Lab.

Explore more of United States

  • Seattle is always a good idea, but there are so many other parts of United States waiting to be discovered. About 241 kilometres south of Seattle, a visit to Portland will keep you on the move. Check out popular attractions like Pioneer Courthouse Square, Portland Japanese Garden and Pittock Mansion.

  • If you want to check out another major stop in United States, head for Spokane, about 370 kilometres east of Seattle. Manito Park, Northwest Museum of Arts & Culture and Spokane Falls are key highlights.

Plan the rest of your trip from Philadelphia to Seattle

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