$601 Cheap Flights from Seattle (BFI) to Philadelphia (PHL)

View $601 flight on Sun, Sep 28, 2025Opens in a new window

Popular airlines from Seattle, WA (BFI-Boeing Field) to Philadelphia Intl. Airport (PHL)

Cheap Flights from Seattle to Philadelphia (BFI-PHL)

Prices were available within the past 7 days and start at $601 for one-way flights and $1,499 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Excursions LLC
Mon, Sep 8 - Mon, Sep 15
BFI
Seattle
PHL
Philadelphia
$1,499 Roundtrip, found 19 hours ago
$1,499
Roundtrip
found 19 hours ago
Select Air Excursions LLC flight, departing Mon, Sep 8 from Seattle to Philadelphia, returning Mon, Sep 15, priced at $1,499 found 19 hours ago
Air Excursions LLC
Mon, Sep 8 - Mon, Sep 15
BFI
Seattle
PHL
Philadelphia
$1,766 Roundtrip, found 19 hours ago
$1,766
Roundtrip
found 19 hours ago
Select Air Excursions LLC flight, departing Mon, Sep 8 from Seattle to Philadelphia, returning Mon, Sep 15, priced at $1,766 found 19 hours ago
Flights from Seattle (BFI) to Philadelphia (PHL)
Origin airport
Boeing Field
Destination airport
Philadelphia Intl.
Roundtrip price
$1,498
Distance
2371 mi

Seattle to Philadelphia Flights

The cheapest times to fly from Seattle to Philadelphia

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to Philadelphia are during the month of September. You can find some of the cheapest flights from Seattle to Philadelphia with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Philadelphia

Sunday is one of the best days to book for cheap flights from Seattle to Philadelphia: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seattle to Philadelphia

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to Philadelphia in 2025. You can also book with separate airlines for your outbound and return journeys, from $601 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to Philadelphia flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to Philadelphia airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Boeing Field Airport (BFI) to Philadelphia Intl. Airport (PHL) cost?
Get a cheap one-way flight from $601 or cheap return flight from $1,499 from Boeing Field Airport (BFI) to Philadelphia Intl. Airport (PHL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Boeing Field Airport (BFI) to Philadelphia Intl. Airport (PHL)?
The cheapest month to fly from BFI to PHL is September, when there's less demand. Off-peak season is usually when airlines offer better prices between these airports.
Which airlines fly direct from Boeing Field Airport (BFI) to Philadelphia Intl. Airport (PHL)?
There are no direct routes from Seattle, WA (BFI-Boeing Field) to Philadelphia Intl. Airport (PHL). However, you can find other airports that offer nonstop flights. Start your journey at Seattle - Tacoma Intl. Airport (SEA) and travel straight to Philadelphia without any detours.
What is the cheapest airline that flies from Boeing Field Airport (BFI) to Philadelphia Intl. Airport (PHL)?
To find the cheapest airline that'll fly you from BFI to PHL, use Expedia's filter tool. Customize your search based on what's important to you, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Boeing Field Airport (BFI) to Philadelphia Intl. Airport (PHL)?
You'll have to take a flight with a layover if you're traveling from Boeing Field Airport (BFI) to Philadelphia Intl. Airport (PHL). There are no daily direct flights on this route. However, just filter your search to include one or two stops to find the best option for your trip.
What day of the week has the most flights from BFI to PHL?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can vary based on various factors, including the time of year and carrier.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Boeing Field Airport (BFI) to Philadelphia Intl. Airport (PHL)?
To reach Philadelphia Intl. Airport (PHL) on schedule, opt for a flight that leaves from Boeing Field Airport (BFI) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Boeing Field Airport (BFI) to Philadelphia Intl. Airport (PHL) last-minute?
Booking your flight from BFI to PHL right before your journey is usually more expensive. But if there's some wiggle room with your departure dates and times, you could grab a cheap last-minute fare.
Is it cheaper to book a BFI to PHL flight and hotel package?
Opting for a BFI to PHL flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Select from our extensive range of stays and then add car rentals, activities and flights to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Boeing Field Airport (BFI) to Philadelphia Intl. Airport (PHL)?
If you booked your BFI to PHL flight in the last 24 hours, you may be able to modify or cancel it without fees. Depending on the airline and the type of fare you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal if you'd like more information.

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*Available to One Key members.