Cheap Flights from Philadelphia (PHL) to Seattle (LKE)

Popular airlines from Philadelphia Intl. Airport (PHL) to Seattle, WA (LKE-Lake Union Seaplane Base)

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $422
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $422
Select flight to Snohomish County - Paine Field PAE. Average driving time to city center is 29 minutes. Flights from $1,119
PAE
Snohomish County - Paine Field
Average driving time to city center29 min
Flights from $1,119
Flights from Philadelphia (PHL) to Seattle (LKE)
Origin airport
Philadelphia Intl.
Destination airport
Lake Union Seaplane Base
Distance
2372 mi

Philadelphia to Seattle Flights

The cheapest times to fly from Philadelphia to Seattle

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 Philadelphia to Seattle are during the month of . You can find some of the cheapest flights from Philadelphia to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Philadelphia to Seattle

Sunday is one of the best days to book for cheap flights from Philadelphia to Seattle: 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 Philadelphia to Seattle

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 Philadelphia to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from 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 Philadelphia to Seattle 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 Philadelphia to Seattle 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 Philadelphia Intl. Airport (PHL) to Lake Union Seaplane Base Airport (LKE) cost?
Snag a cheap one-way flight or cheap return flight from Philadelphia Intl. Airport (PHL) to Lake Union Seaplane Base Airport (LKE) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Philadelphia Intl. Airport (PHL) to Lake Union Seaplane Base Airport (LKE)?
is the least expensive month to fly from PHL to LKE. Planning your trip for the off-season is often the key to landing a great deal.
What is the cheapest airline that flies from Philadelphia Intl. Airport (PHL) to Lake Union Seaplane Base Airport (LKE)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest PHL to LKE flight.
How many flights per day from Philadelphia Intl. Airport (PHL) to Lake Union Seaplane Base Airport (LKE)?
Direct flights from Philadelphia Intl. Airport (PHL) to Lake Union Seaplane Base Airport (LKE) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your travel dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from PHL to LKE?
Typically you'll find the widest variety of flight choices on a Friday. Tuesdays are often the quietest.* But this can change depending on the airline, time of year and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Philadelphia Intl. Airport (PHL) to Lake Union Seaplane Base Airport (LKE)?
To avoid potential delays on the Philadelphia Intl. Airport (PHL) to Lake Union Seaplane Base Airport (LKE) route, travel before 3 PM. Later departures have a 22% higher chance of being canceled.**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.
What airports do you fly into for Seattle from Philadelphia Intl. Airport (PHL)?
If you're on a direct flight from Philadelphia Intl. Airport (PHL) to Seattle, Seattle - Tacoma Intl. Airport (SEA) is the only airport you can touch down at.
Is it cheaper to buy a plane ticket from Philadelphia Intl. Airport (PHL) to Lake Union Seaplane Base Airport (LKE) last-minute?
Last-minute bookings from PHL to LKE are typically more expensive. To secure the best prices, start searching for flights well in advance. That being said, if your travel plans are flexible, it's possible to score a cheap ticket right before your journey.
Is it cheaper to book a PHL to LKE flight and hotel package?
Opting for a PHL to LKE flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip in one place. Choose from our extensive range of stays and then add activities, car rentals 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 Philadelphia Intl. Airport (PHL) to Lake Union Seaplane Base Airport (LKE)?
In most instances, you can cancel or modify your PHL to LKE flight. However, there may be additional charges, especially if you made your booking over 24 hours ago. Double-check your itinerary for the airline's fees and guidelines on flight changes, or if you need more details, go to our Customer Service portal.

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*Available to One Key members.