How popular is this Seattle to Philadelphia flight route?

This flight path from Seattle/Tacoma Intl to Philadelphia was viewed by 10 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

How long is the flight from Seattle to Philadelphia?

For as low as C$ 565, Southwest can have you in Philadelphia from Seattle in 5h 04m. Seattle and Philadelphia are separated by a distance of 3814 km. This flight may include one or multiple stops.

What are the cheapest airlines flying from Seattle to Philadelphia round-trip?

Our cheapest airline available from Seattle to Philadelphia is American Airlines. Our recent data shows that you can find tickets from as low as C$ 366 on this airline. An additional option worth looking into is Alaska Airlines, starting at C$ 468. American Airlines is currently priced 40% below the average price you’ll pay for this route.

Weekly flight availability from Seattle to Philadelphia

The most flights from SEA to PHL are scheduled on a Monday (11 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (3 on average).

In terms of precipitation, rainfall in Philadelphia ranges from 69.0 - 112.0 mm per month. July is typically the wettest month, when rainfall can reach 112.0 mm. February is typically the driest time to visit Philadelphia when rainfall is around 69.0 mm.

If weather is an important factor for your trip to Philadelphia, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 26.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 1.0 C).

What are the cheapest flights from Seattle to Philadelphia?

Looking for the cheapest flight from Seattle to Philadelphia? While on average our users pay C$ 641, our data indicates the cheapest price to be C$ 636. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 620.

What are the most reliable airlines from Seattle to Philadelphia?

Before booking your flight to Philadelphia from Seattle, check out the most reliable airlines to get you to your destination on time: Qatar Airways (95%), Cathay Pacific (85%), Delta( 83%).

What airports do I use to fly from Seattle to Philadelphia?

If you book a flight from Seattle to Philadelphia, you will be flying from Seattle/Tacoma Intl to Philadelphia. Flights to Philadelphia (PHL) from Seattle/Tacoma Intl (SEA) take 5h 03m for a nonstop flight. There are 4 flights from Seattle/Tacoma Intl to Philadelphia per day from 2 airlines.

Can I find deals for flights from Seattle to Philadelphia that include hotel bookings?

Yes. In addition to deals on Seattle to Philadelphia flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Seattle to Philadelphia?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Philadelphia.

Can I find deals for business class flights from Seattle to Philadelphia?

Yes. Cheapflights offers flight deals from Seattle to Philadelphia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

C$ 298+ Cheap Flights from Seattle to Philadelphia

Cheap flight deals from Seattle to Philadelphia

Enter your travel dates to find the best prices.

Cheapest

Best

Direct

Last-minute

One-way

Cheapest flights from Seattle to Philadelphia
Explore the most affordable flight options available from Seattle to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 6 October 2026.

Sat 31/109:35 a.m. -

1 stop7h 25m

Sat 7/112:45 p.m. -

2 stops10h 10m

Deal found 2/10C$ 516

Sun 1/1112:15 a.m. -

1 stop7h 45m

Wed 4/112:45 p.m. -

2 stops11h 05m

Deal found 5/10C$ 518

Sun 1/115:30 a.m. -

1 stop8h 10m

Sat 7/115:20 a.m. -

1 stop8h 45m

Deal found 6/10C$ 526

Thu 5/1110:45 a.m. -

2 stops10h 25m

Wed 11/116:20 p.m. -

1 stop8h 15m

Deal found 4/10C$ 528

Tue 6/101:25 p.m. -

1 stop7h 10m

Tue 10/116:20 p.m. -

1 stop8h 15m

Deal found 6/10C$ 531

Thu 5/1110:45 a.m. -

2 stops10h 25m

Tue 10/112:45 p.m. -

2 stops11h 05m

Deal found 6/10C$ 536

Fri 4/1211:20 a.m. -

1 stop7h 00m

Sun 6/125:00 a.m. -

1 stop8h 40m

Deal found 6/10C$ 543

Find flight deals from Seattle to Philadelphia

Round-trip from	C$ 516
One-way from	C$ 298
Popular in	December
Cheapest in	January
Average price	C$ 568
Good round-trip deal	C$ 636 or less

Southwest
31/10-7/11
3 total stops
17h 35m total
Seattle to Philadelphia

Search Deals

United Airlines
11/2-31/12
1 total stop
7h 37m total
Seattle to Philadelphia

Search Deals

Highest demand for flights based on searches. 1% potential increase in price (C$ 14 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (C$ 21 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in October 2026

Search Deals

Price to beat on a round-trip flight from Seattle/Tacoma Intl to Philadelphia.

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to Philadelphia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Sun 8/11

10:56 p.m.-9:52 a.m.

1 stop7h 56m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 298

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Thu 10/12

11:20 a.m.-9:20 p.m.

1 stop7h 00m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 298

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Thu 17/12

6:45 a.m.-7:25 p.m.

2 stops9h 40m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 305

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Tue 5/1

9:25 a.m.-9:20 p.m.

2 stops8h 55m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 305

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Fri 15/1

9:15 a.m.-9:50 p.m.

2 stops9h 35m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 305

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Wed 18/11

9:25 a.m.-10:10 p.m.

2 stops9h 45m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 305

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Wed 9/12

9:25 a.m.-10:05 p.m.

2 stops9h 40m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 305

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Thu 24/12

8:38 a.m.-12:34 a.m.

2 stops12h 56m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 318

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Mon 2/11

9:30 p.m.-5:44 a.m.

Nonstop5h 14m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 326

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Sat 3/4

9:45 p.m.-5:55 a.m.

Nonstop5h 10m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 328

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 21 resultsSorted by cheapest first

Best time to book a flight from Seattle to Philadelphia

Have a flexible travel schedule? Discover the best time to fly to Philadelphia from Seattle with our price prediction graph.

SEA-PHL

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Philadelphia

Prices

Airlines

How far ahead should I book a flight from Seattle to Philadelphia?

The best time to book flights from Seattle to Philadelphia is 58 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Seattle to Philadelphia?

Currently, January is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 490). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 759). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to PHL?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Philadelphia as you normally would.

How much does it cost to fly round-trip from Seattle to Philadelphia?

Airfare is typical for this route at the moment.

Seattle to Philadelphia flights typically cost between C$ 489 and C$ 677 in October.
The cheapest round-trip price found within the last 5 days was C$ 516 on Southwest (31 Oct-7 Nov).

Reviews of airlines servicing Philadelphia

Get a feel of what it's like to fly with Alaska Airlines and American Airlines from Seattle to Philadelphia by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

7.9

Good

13,029 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

Alaska Airlines

7.9

Good

13,029 reviews

Alaska Airlines

7.9

Good

13,029 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

American Airlines

7.0

Good

12,130 reviews

Alaska Airlines

7.9

Good

13,029 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

Related info for your journey

What airports do I use to fly from Seattle to Philadelphia?
If you book a flight from Seattle to Philadelphia, you will be flying from Seattle/Tacoma Intl to Philadelphia. Flights to Philadelphia (PHL) from Seattle/Tacoma Intl (SEA) take 5h 03m for a nonstop flight. There are 4 flights from Seattle/Tacoma Intl to Philadelphia per day from 2 airlines.
How popular is this Seattle to Philadelphia flight route?
This flight path from Seattle/Tacoma Intl to Philadelphia was viewed by 10 users in the past month. Keep an eye out for changes in search interest prior to high and low season.
How long is the flight from Seattle to Philadelphia?
For as low as C$ 565, Southwest can have you in Philadelphia from Seattle in 5h 04m. Seattle and Philadelphia are separated by a distance of 3814 km. This flight may include one or multiple stops.
What are the cheapest airlines flying from Seattle to Philadelphia round-trip?
Our cheapest airline available from Seattle to Philadelphia is American Airlines. Our recent data shows that you can find tickets from as low as C$ 366 on this airline. An additional option worth looking into is Alaska Airlines, starting at C$ 468. American Airlines is currently priced 40% below the average price you’ll pay for this route.
What are the most reliable airlines from Seattle to Philadelphia?
Before booking your flight to Philadelphia from Seattle, check out the most reliable airlines to get you to your destination on time: Qatar Airways (95%), Cathay Pacific (85%), Delta( 83%).
What are the cheapest flights from Seattle to Philadelphia?
Looking for the cheapest flight from Seattle to Philadelphia? While on average our users pay C$ 641, our data indicates the cheapest price to be C$ 636. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 620.
Can I find deals for flights from Seattle to Philadelphia that include hotel bookings?
Yes. In addition to deals on Seattle to Philadelphia flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Seattle to Philadelphia?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Philadelphia.
Can I find deals for business class flights from Seattle to Philadelphia?
Yes. Cheapflights offers flight deals from Seattle to Philadelphia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Seattle to Philadelphia?
Currently, January is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 490). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 759). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Voorhees

Reading

King of Prussia

Wildwood

West Chester

Browse thousands of different options on Cheapflights for your next trip

Alternative routes

Complete your trip

Direct flights to Pennsylvania

Flights by cabin class

Other flight options

Other flights from Seattle

Philadelphia flight routes

Popular flights

Alternative routes for Seattle to Philadelphia

Seattle to Newark flights

Seattle to Dulles Intl flights

Seattle to Reagan-National flights

Portland to Newark flights

Seattle to John F Kennedy Intl flights

Seattle to LaGuardia flights

Seattle to Pittsburgh flights

Bellingham to Newark flights

Top 2 airlines flying from Seattle to Philadelphia

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	CheapestC$ 366	AverageC$ 636	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Alaska Airlines	CheapestC$ 468	AverageC$ 551	FlexibilityNo cancel fee	On-time75%	Search Alaska Airlines flights

Fly with Cheapflights

How does Cheapflights help users find flights from Seattle to Philadelphia?

Cheapflights helps you search for flights from Seattle to Philadelphia via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Philadelphia?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Seattle to Philadelphia for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Seattle to Philadelphia with no change fees?

Yes, we can. To see specific flights from Seattle to Philadelphia with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Seattle to Philadelphia become cheaper?

Yes! Start tracking prices for Seattle to Philadelphia flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

Cheap flights from Seattle to Philadelphia from C$ 298

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/2. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Seattle to Philadelphia

Cheapest flights from Seattle to PhiladelphiaExplore the most affordable flight options available from Seattle to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 6 October 2026.

Explore the most affordable flight options available from Seattle to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 6 October 2026.

Best flights from Seattle to PhiladelphiaDiscover carefully curated flight deals from Seattle to Philadelphia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 6 October 2026.

Discover carefully curated flight deals from Seattle to Philadelphia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 6 October 2026.

Direct flights from Seattle to PhiladelphiaExplore direct flight options from Seattle to Philadelphia based on user searches, and compare prices and availability for your desired travel dates. Data last updated 6 October 2026.

Explore direct flight options from Seattle to Philadelphia based on user searches, and compare prices and availability for your desired travel dates. Data last updated 6 October 2026.

Last-minute flights from Seattle to PhiladelphiaDiscover last-minute flight deals from Seattle to Philadelphia. Data last updated 6 October 2026 and is based on user searches.

Discover last-minute flight deals from Seattle to Philadelphia. Data last updated 6 October 2026 and is based on user searches.

One-way flights from Seattle to PhiladelphiaSearch for one-way flight options from Seattle to Philadelphia. Find affordable one-way fares based on user searches. Data last updated 6 October 2026.

Search for one-way flight options from Seattle to Philadelphia. Find affordable one-way fares based on user searches. Data last updated 6 October 2026.

Find flight deals from Seattle to Philadelphia

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to Philadelphia that are best for you.

Best time to book a flight from Seattle to Philadelphia

Have a flexible travel schedule? Discover the best time to fly to Philadelphia from Seattle with our price prediction graph.

Cheapflights Insights

How far ahead should I book a flight from Seattle to Philadelphia?

The best time to book flights from Seattle to Philadelphia is 58 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Seattle to Philadelphia?

What is the cheapest time of day to fly from SEA to PHL?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Philadelphia as you normally would.

How much does it cost to fly round-trip from Seattle to Philadelphia?

Airfare is typical for this route at the moment.

Seattle to Philadelphia flights typically cost between C$ 489 and C$ 677 in October.The cheapest round-trip price found within the last 5 days was C$ 516 on Southwest (31 Oct-7 Nov).

Weekly flight availability from Seattle to Philadelphia

The most flights from SEA to PHL are scheduled on a Monday (11 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (3 on average).

Reviews of airlines servicing Philadelphia

Get a feel of what it's like to fly with Alaska Airlines and American Airlines from Seattle to Philadelphia by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

What airports do I use to fly from Seattle to Philadelphia?

How popular is this Seattle to Philadelphia flight route?

How long is the flight from Seattle to Philadelphia?

What are the cheapest airlines flying from Seattle to Philadelphia round-trip?

What are the most reliable airlines from Seattle to Philadelphia?

What are the cheapest flights from Seattle to Philadelphia?

Can I find deals for flights from Seattle to Philadelphia that include hotel bookings?

How can I find direct flights from Seattle to Philadelphia?

Can I find deals for business class flights from Seattle to Philadelphia?

What is the cheapest month to book a flight from Seattle to Philadelphia?

Travelling to a place near Philadelphia?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Philadelphia

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Philadelphia by adding a car rental and/or hotel reservation to your travel itinerary.

Direct flights to Pennsylvania

Book a non-stop flight to one of these other cities located in Pennsylvania.

Search flights from Seattle to Philadelphia by cabin class

Find flights from Seattle to Philadelphia, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Seattle and Philadelphia flights

Browse other Seattle and Philadelphia flight options. Last updated on 6 October 2026.

Other flights from Seattle

Browse through other flights departing from Seattle. Flights are based on user searches made on Cheapflights and were last updated on 6 October 2026.

Other flights to Philadelphia

Explore flights to Philadelphia departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 6 October 2026.

Popular flight searches

Check out other popular destinations found by fellow travellers in 2026

Top 2 airlines flying from Seattle to Philadelphia

Fly with Cheapflights

How does Cheapflights help users find flights from Seattle to Philadelphia?

Why should you use Cheapflights to find cheap flight tickets from Seattle to Philadelphia?

Can Cheapflights find flights from Seattle to Philadelphia with no change fees?

Can Cheapflights notify me if prices for flights from Seattle to Philadelphia become cheaper?

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Seattle to Philadelphia
Explore the most affordable flight options available from Seattle to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 6 October 2026.

Best flights from Seattle to Philadelphia
Discover carefully curated flight deals from Seattle to Philadelphia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 6 October 2026.

Direct flights from Seattle to Philadelphia
Explore direct flight options from Seattle to Philadelphia based on user searches, and compare prices and availability for your desired travel dates. Data last updated 6 October 2026.

Last-minute flights from Seattle to Philadelphia
Discover last-minute flight deals from Seattle to Philadelphia. Data last updated 6 October 2026 and is based on user searches.

One-way flights from Seattle to Philadelphia
Search for one-way flight options from Seattle to Philadelphia. Find affordable one-way fares based on user searches. Data last updated 6 October 2026.

Seattle to Philadelphia flights typically cost between C$ 489 and C$ 677 in October.
The cheapest round-trip price found within the last 5 days was C$ 516 on Southwest (31 Oct-7 Nov).