How popular is this Seattle to Philadelphia flight route?

Flights from Seattle/Tacoma Intl to Philadelphia have been viewed 13 times in the past calendar month.

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

Currently priced at $307, Delta will fly you from Seattle to Philadelphia and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Frontier and Spirit Airlines - these airlines can fly you to your destination from $311 and $313, respectively. Delta is currently priced 33% below the average price you’ll pay for this route.

What are the cheapest airlines to fly from Seattle to Philadelphia one-way?

One-way options have recently been found by users for as low as $138 on Spirit Airlines. Other airlines that offer cheap prices include Delta from $144 and Frontier from $150 one-way.

What are the cheapest flights from Seattle to Philadelphia?

Looking at all options, your cheapest flight can be booked for $138. While the most popular route (Seattle/Tacoma Intl - Philadelphia) can be booked for $182 on average our data indicates $916 when flying from Seattle to Philadelphia.

What are the most reliable airlines from Seattle to Philadelphia?

No one likes to see their flight delayed. When booking a flight from Seattle to Philadelphia consider choosing Alaska Airlines (90%), Hawaiian Airlines (90%) or Air Tahiti Nui (90%) as they are the most reliable in getting you off to your destination on time.

What are the most popular airlines that fly from Seattle to Philadelphia?

American Airlines, Alaska Airlines and Delta are the most popular airlines when flying from Seattle to Philadelphia.

Where are the most common layover locations when flying from Seattle to Philadelphia?

Flights departing from Seattle and landing in Philadelphia layover in Salt Lake City most frequently.

Where are the least popular layover locations for Seattle to Philadelphia flights?

Seattle to Philadelphia flights that have layovers will least frequently stop in Denver.

What are some popular things to do or see while on a layover in Salt Lake City?

Temple Square, Abravanel Hall, and Salt Lake Temple are the most popular attractions in Salt Lake City if you're in need of something to do during your layover. Temple Square, Abravanel Hall and Salt Lake Temple are located about 4.7 mi, 4.7 mi, and 4.8 mi, respectively from Salt Lake City if you are interested in checking them out. Those on a layover in Salt Lake City in need of a rental car can book one at Salt Lake City for about $53.

What is the cheapest day to fly round-trip from Seattle to Philadelphia?

Leaving on a Monday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 23% on the overall cost on flights from Seattle to Philadelphia.

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

To save on the cost of your flight from Seattle to Philadelphia, book at least 50 days before your planned departure. Booking around this time can save you about 124% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $592 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $926.

What is the cheapest month to fly from Seattle to Philadelphia?

March is one of the best times of the year to fly to Philadelphia from Seattle. Prices for March average $460 per person but you can even find prices for as low as $285. The most expensive prices can be found in the month of December. Opting for a March flight can save you 27% on your journey compared to booking in December

Most accurate provider : When it comes to deals on Seattle-Philadelphia flights, users find the pricing of Mytrip to be most consistent on Cheapflights vs. Mytrip Users can find the same prices on Seattle-Philadelphia flight deals on Cheapflights vs. Mytrip >95% of the time. Price accuracy is based on data collected from Seattle-Philadelphia flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Seattle-Philadelphia flights, Cheapflights users trust Mytrip the most. Mytrip has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Philadelphia flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

To fly from Seattle to Philadelphia, you need to book a flight from Seattle/Tacoma Intl (SEA) to Philadelphia (PHL). Nonstop flights to Philadelphia from Seattle/Tacoma Intl take 5h 08m on average. When it comes time to book airfare, you have a few options: there are 7 outbound flights from Seattle/Tacoma Intl to Philadelphia offered by 9 different 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.

$138+ Flights from Seattle to Philadelphia

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Find cheap flights from Seattle to Philadelphia with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Philadelphia are usually found in March or January, booked 85 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

Cheap flight deals from Seattle to Philadelphia

Most accurate provider	Mytrip 3 stars
Most trusted provider	Mytrip 3 stars
Round-trip from	$304 (CheapOair)
One-way from	$138 (Mytrip)
Popular in	December
Cheapest in	March
Average price	$427
Good round-trip deal	$368 or less
Good one-way deal	$194 or less

Provider with most accurate pricing for Seattle/Tacoma Intl-Philadelphia flight deals.

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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Philadelphia flights.

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From Seattle/Tacoma Intl to Philadelphia

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One-way flight from Seattle/Tacoma Intl to Philadelphia

Search Deals

Highest demand for flights based on searches. 4% potential increase in price ($21 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).

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Average for round-trip flights in April 2025

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

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Price to beat on a one-way flight from Seattle/Tacoma Intl to Philadelphia.

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Find flight deals from Seattle to Philadelphia

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 April 25, 2025.

Wed 5/213:20 pmSEA - PHL

1 stop11h 41mMultiple Airlines

Mon 5/2612:59 pmPHL - SEA

1 stop8h 16mMultiple Airlines

Deal found 4/24

$304

Thu 7/35:30 amSEA - PHL

1 stop9h 03mDelta

Tue 7/86:40 pmPHL - SEA

1 stop8h 23mDelta

Deal found 4/25

$307

Fri 5/26:00 amSEA - PHL

1 stop8h 37mFrontier

Sun 5/412:20 pmPHL - SEA

1 stop15h 24mFrontier

Deal found 4/24

$310

Mon 6/93:20 pmSEA - PHL

2 stops26h 05mSpirit Airlines

Mon 6/1610:42 amPHL - SEA

1 stop31h 21mSpirit Airlines

Deal found 4/25

$312

Tue 8/512:20 amSEA - PHL

1 stop7h 27mUnited Airlines

Thu 8/76:46 pmPHL - SEA

1 stop8h 13mUnited Airlines

Deal found 4/25

$326

Tue 8/129:15 pmSEA - PHL

Nonstop5h 10mAlaska Airlines

Tue 9/96:58 pmPHL - SEA

Nonstop6h 02mAlaska Airlines

Deal found 4/23

$337

Tue 6/310:59 pmSEA - PHL

Nonstop5h 08mAmerican Airlines

Sat 6/77:10 pmPHL - SEA

Nonstop6h 16mAmerican Airlines

Deal found 4/25

$338

Thu 6/1210:55 pmSEA - PHL

1 stop7h 30mSouthwest

Mon 6/165:10 pmPHL - SEA

2 stops10h 20mSouthwest

Deal found 4/24

$348

Thu 11/206:24 pmSEA - PHL

1 stop12h 27mSun Country Air

Sun 11/2310:00 amPHL - SEA

1 stop10h 15mSun Country Air

Deal found 4/25

$355

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 April 25, 2025.

Wed 5/213:20 pmSEA - PHL

1 stop11h 41mMultiple Airlines

Mon 5/2612:59 pmPHL - SEA

1 stop8h 16mMultiple Airlines

Deal found 4/24

$304

Thu 7/35:30 amSEA - PHL

1 stop9h 03mDelta

Tue 7/86:40 pmPHL - SEA

1 stop8h 23mDelta

Deal found 4/25

$307

Fri 5/1612:31 pmSEA - PHL

1 stop29h 44mFrontier

Sun 5/186:54 pmPHL - SEA

1 stop26h 06mFrontier

Deal found 4/24

$311

Mon 6/93:20 pmSEA - PHL

2 stops26h 05mSpirit Airlines

Mon 6/1610:42 amPHL - SEA

1 stop31h 21mSpirit Airlines

Deal found 4/25

$313

Tue 8/129:15 pmSEA - PHL

Nonstop5h 10mAlaska Airlines

Tue 9/96:58 pmPHL - SEA

Nonstop6h 02mAlaska Airlines

Deal found 4/23

$337

Tue 6/310:59 pmSEA - PHL

Nonstop5h 08mAmerican Airlines

Sat 6/77:10 pmPHL - SEA

Nonstop6h 16mAmerican Airlines

Deal found 4/25

$338

Tue 7/87:00 pmSEA - PHL

1 stop7h 37mUnited Airlines

Sat 7/126:46 pmPHL - SEA

1 stop8h 13mUnited Airlines

Deal found 4/23

$345

Thu 6/1210:55 pmSEA - PHL

1 stop7h 30mSouthwest

Mon 6/165:10 pmPHL - SEA

2 stops10h 20mSouthwest

Deal found 4/24

$348

Wed 5/219:25 pmSEA - PHL

Nonstop5h 15mHawaiian Airlines

Tue 5/276:59 pmPHL - SEA

Nonstop5h 59mHawaiian Airlines

Deal found 4/24

$437

Last-minute flights from Seattle to Philadelphia
Discover last-minute flight deals from Seattle to Philadelphia. Data last updated April 25, 2025 and is based on user searches.

Thu 5/16:33 pmSEA - PHL

1 stop13h 26mSun Country Air

Sun 5/48:00 amPHL - SEA

1 stop12h 15mSun Country Air

Deal found 4/24

$505

Fri 5/26:00 amSEA - PHL

1 stop8h 37mFrontier

Sun 5/412:20 pmPHL - SEA

1 stop15h 24mFrontier

Deal found 4/24

$310

Fri 5/28:56 pmSEA - PHL

1 stop29h 56mSpirit Airlines

Tue 5/610:08 pmPHL - SEA

1 stop29h 02mSpirit Airlines

Deal found 4/25

$320

Fri 5/212:59 amSEA - PHL

1 stop8h 54mAmerican Airlines

Thu 5/86:45 pmPHL - SEA

Nonstop6h 05mAmerican Airlines

Deal found 4/24

$672

Fri 5/27:20 amSEA - PHL

2 stops11h 05mSouthwest

Mon 5/52:40 pmPHL - SEA

2 stops9h 30mSouthwest

Deal found 4/24

$797

Sat 5/312:30 pmSEA - PHL

1 stop14h 22mMultiple Airlines

Mon 5/512:20 pmPHL - SEA

1 stop15h 24mMultiple Airlines

Deal found 4/24

$317

Sat 5/39:29 pmSEA - PHL

Nonstop5h 15mAlaska Airlines

Sun 5/48:45 amPHL - SEA

1 stop14h 50mAlaska Airlines

Deal found 4/24

$607

Sat 5/38:50 amSEA - PHL

1 stop11h 45mUnited Airlines

Wed 5/78:00 amPHL - SEA

1 stop8h 30mUnited Airlines

Deal found 4/23

$650

Sun 5/412:45 amSEA - PHL

1 stop6h 51mDelta

Sat 5/107:05 amPHL - SEA

1 stop10h 40mDelta

Deal found 4/25

$529

Sun 5/49:29 pmSEA - PHL

Nonstop5h 15mHawaiian Airlines

Wed 5/146:53 pmPHL - SEA

Nonstop6h 07mHawaiian Airlines

Deal found 4/25

$712

Mon 5/1910:59 pmSEA - PHL

Nonstop5h 08mAmerican Airlines

Wed 5/286:45 pmPHL - SEA

Nonstop6h 05mAmerican Airlines

Deal found 4/25

$337

Mon 5/1910:35 amSEA - PHL

2 stops10h 10mSouthwest

Sat 5/242:15 pmPHL - SEA

2 stops11h 30mSouthwest

Deal found 4/25

$497

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 April 25, 2025.

Thu 5/296:00 amSEA - PHL

2 stops45h 30mSpirit Airlines

Deal found 4/25

$138

Tue 7/15:30 pmSEA - PHL

1 stop9h 20mDelta

Deal found 4/23

$144

Fri 5/233:11 pmSEA - PHL

1 stop11h 27mFrontier

Deal found 4/23

$150

Tue 5/1310:55 amSEA - PHL

1 stop7h 28mUnited Airlines

Deal found 4/25

$155

Tue 7/89:50 pmSEA - PHL

1 stop8h 58mJetBlue

Deal found 4/25

$157

Tue 7/89:15 pmSEA - PHL

Nonstop5h 10mAlaska Airlines

Deal found 4/24

$169

Mon 6/210:59 pmSEA - PHL

Nonstop5h 08mAmerican Airlines

Deal found 4/25

$170

Tue 6/37:35 amSEA - PHL

2 stops11h 35mSouthwest

Deal found 4/24

$177

Sun 6/2211:59 pmSEA - PHL

1 stop8h 11mSun Country Air

Deal found 4/24

$258

Wed 6/2511:59 pmSEA - PHL

3 stops28h 49mMultiple Airlines

Deal found 4/23

$340

Wed 5/79:29 pmSEA - PHL

Nonstop5h 15mHawaiian Airlines

Deal found 4/25

$384

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

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 5/21

3:20 pm-6:01 am

1 stop11h 41m

Philadelphia

Mon 5/26

12:59 pm-6:15 pm

1 stop8h 16m

$304

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 7/3

5:30 am-5:33 pm

1 stop9h 03m

Philadelphia

Tue 7/8

6:40 pm-12:03 am

1 stop8h 23m

$307

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 5/16

12:31 pm-9:15 pm

1 stop29h 44m

Philadelphia

Sun 5/18

12:20 pm-12:44 am

1 stop15h 24m

$311

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 6/9

3:20 pm-8:25 pm

2 stops26h 05m

Philadelphia

Mon 6/16

10:42 am-3:03 pm

1 stop31h 21m

$312

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 8/5

12:20 am-10:47 am

1 stop7h 27m

Philadelphia

Thu 8/7

6:46 pm-11:59 pm

1 stop8h 13m

$326

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 8/12

9:15 pm-5:25 am

Nonstop5h 10m

Philadelphia

Tue 9/9

6:58 pm-10:00 pm

Nonstop6h 02m

$337

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 6/3

10:59 pm-7:07 am

Nonstop5h 08m

Philadelphia

Sat 6/7

7:10 pm-10:26 pm

Nonstop6h 16m

$338

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 6/12

10:55 pm-9:25 am

1 stop7h 30m

Philadelphia

Mon 6/16

5:10 pm-12:30 am

2 stops10h 20m

$348

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 5/29

6:00 am-6:30 am

2 stops45h 30m

$138

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 7/1

5:30 pm-5:50 am

1 stop9h 20m

$144

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/25

Showing 1-10 of 19 results

Compare providers for flights from Seattle to Philadelphia

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Philadelphia in April.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*2 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Cheapflightsfares	Price Accuracy3 stars	Trust Score*2 stars
CheapTicketsDeal	Price Accuracy3 stars	Trust Score*3 stars
Mytrip	Price Accuracy3 stars	Trust Score*3 stars
CheapOair	Price Accuracy1 star	Trust Score*3 stars
JustAirTicket	Price Accuracy-	Trust Score*3 stars
Priceline	Price Accuracy1 star	Trust Score*3 stars
Gotogate	Price Accuracy3 stars	Trust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Seattle-Philadelphia flights, users find the pricing of Mytrip to be most consistent on Cheapflights vs. Mytrip Users can find the same prices on Seattle-Philadelphia flight deals on Cheapflights vs. Mytrip >95% of the time. Price accuracy is based on data collected from Seattle-Philadelphia flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Seattle-Philadelphia flights, Cheapflights users trust Mytrip the most. Mytrip has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Philadelphia flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

The best insider tips for Seattle to Philadelphia flights

Cheapflights partnered with top experts to bring you the best recommendations for your Seattle to Philadelphia trip

Airports

SEA

Plan to arrive at SEA two hours before your flight. Use SEA Spot Saver for security screening appointments to reduce wait times.

PHL

For a quick trip to Center City, use SEPTA's Airport Line. It's efficient and faster than other transport options.

Our travel experts

Mark Chesnut

Expert on PHL

Brandon Schultz

Expert on SEA

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.

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

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

The best time to book flights from Seattle to Philadelphia is 85 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, August is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of $236). Flying from Seattle to Philadelphia in March is currently the most expensive (average of $295). 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?

A simple way to save on the total cost of your ticket is to fly from Seattle to Philadelphia at noon. If you’re flexible enough to do this you can expect to save up to 53% on your trip compared to booking a flight in the afternoon.

What is the cheapest day to fly from Seattle to Philadelphia?

Travelers seeking maximum savings on their Seattle to Philadelphia flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Seattle to Philadelphia

The most flights from SEA to PHL are scheduled on a Thursday (8 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (6 on average).

Rainfall in Philadelphia by month

In terms of precipitation, rainfall in Philadelphia ranges from 2.7 - 4.4 inches per month. July is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Philadelphia when rainfall is around 2.7 in.

Temperature in Philadelphia by month

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 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

Reviews of airlines servicing Philadelphia

Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Seattle to Philadelphia. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

9,927 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Alaska Airlines

8.0

Very good

9,927 reviews

Alaska Airlines

8.0

Very good

9,927 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Southwest

8.0

Very good

4,289 reviews

Alaska Airlines

8.0

Very good

9,927 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Delta

8.0

Very good

7,920 reviews

Alaska Airlines

8.0

Very good

9,927 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Hawaiian Airlines

7.9

Good

2,393 reviews

Alaska Airlines

8.0

Very good

9,927 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

United Airlines

7.4

Good

8,685 reviews

Alaska Airlines

8.0

Very good

9,927 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Related info for your journey

What airports do I use to fly from Seattle to Philadelphia?
To fly from Seattle to Philadelphia, you need to book a flight from Seattle/Tacoma Intl (SEA) to Philadelphia (PHL). Nonstop flights to Philadelphia from Seattle/Tacoma Intl take 5h 08m on average. When it comes time to book airfare, you have a few options: there are 7 outbound flights from Seattle/Tacoma Intl to Philadelphia offered by 9 different airlines.
How popular is this Seattle to Philadelphia flight route?
Flights from Seattle/Tacoma Intl to Philadelphia have been viewed 13 times in the past calendar month.
What are the cheapest airlines flying from Seattle to Philadelphia round-trip?
Currently priced at $307, Delta will fly you from Seattle to Philadelphia and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Frontier and Spirit Airlines - these airlines can fly you to your destination from $311 and $313, respectively. Delta is currently priced 33% below the average price you’ll pay for this route.
What are the cheapest airlines to fly from Seattle to Philadelphia one-way?
One-way options have recently been found by users for as low as $138 on Spirit Airlines. Other airlines that offer cheap prices include Delta from $144 and Frontier from $150 one-way.
What are the most reliable airlines from Seattle to Philadelphia?
No one likes to see their flight delayed. When booking a flight from Seattle to Philadelphia consider choosing Alaska Airlines (90%), Hawaiian Airlines (90%) or Air Tahiti Nui (90%) as they are the most reliable in getting you off to your destination on time.
What are the cheapest flights from Seattle to Philadelphia?
Looking at all options, your cheapest flight can be booked for $138. While the most popular route (Seattle/Tacoma Intl - Philadelphia) can be booked for $182 on average our data indicates $916 when flying from Seattle to Philadelphia.
Where are the most common layover locations when flying from Seattle to Philadelphia?
Flights departing from Seattle and landing in Philadelphia layover in Salt Lake City most frequently.
What are some popular things to do or see while on a layover in Salt Lake City?
Temple Square, Abravanel Hall, and Salt Lake Temple are the most popular attractions in Salt Lake City if you're in need of something to do during your layover. Temple Square, Abravanel Hall and Salt Lake Temple are located about 4.7 mi, 4.7 mi, and 4.8 mi, respectively from Salt Lake City if you are interested in checking them out. Those on a layover in Salt Lake City in need of a rental car can book one at Salt Lake City for about $53.
Where are the least popular layover locations for Seattle to Philadelphia flights?
Seattle to Philadelphia flights that have layovers will least frequently stop in Denver.
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, August is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of $236). Flying from Seattle to Philadelphia in March is currently the most expensive (average of $295). 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

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Top 9 airlines flying from Seattle to Philadelphia

Airline	Cheapest	Average	Flexibility	On-time
Spirit Airlines	Cheapest$85	Average$214	FlexibilityNo cancel fee	On-time65%
Frontier	Cheapest$138	Average$257	FlexibilityNo cancel fee	On-time62%
Sun Country Air	Cheapest$220	Average$333	FlexibilityNo cancel fee	On-time83%
United Airlines	Cheapest$271	Average$453	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$276	Average$398	FlexibilityNo cancel fee	On-timeN/A
Alaska Airlines	Cheapest$296	Average$524	FlexibilityNo cancel fee	On-time75%
American Airlines	Cheapest$305	Average$453	FlexibilityNo cancel fee	On-time71%
Hawaiian Airlines	Cheapest$327	Average$497	FlexibilityNo cancel fee	On-time85%
Southwest	Cheapest$346	Average$426	FlexibilityNo cancel fee	On-time63%

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$138+ Cheap flights from Seattle to Philadelphia (SEA - PHL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/29. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Philadelphia are usually found in March or January, booked 85 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

Cheap flight deals from Seattle to Philadelphia

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Find 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 April 25, 2025.

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 April 25, 2025.

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

Compare providers for flights from Seattle to Philadelphia

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Philadelphia in April.

The best insider tips for Seattle to Philadelphia flights

Cheapflights partnered with top experts to bring you the best recommendations for your Seattle to Philadelphia trip

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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

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

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

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Philadelphia. Price data was last updated on April 18, 2025.

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?

Find hourly flight availability from Seattle to Philadelphia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 25, 2025.

What is the cheapest day to fly from Seattle to Philadelphia?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Philadelphia. Price data was last updated on March 30, 2025.

Weekly flight availability from Seattle to Philadelphia

Explore weekly flight availability from Seattle to Philadelphia. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 25, 2025.

Rainfall in Philadelphia by month

Plan your trip to Philadelphia by taking into account the average rainfall totals by month.

Temperature in Philadelphia by month

Plan your trip to Philadelphia by taking into account the average temperature totals by month.

Reviews of airlines servicing Philadelphia

Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Seattle to Philadelphia. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Philadelphia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

How popular is this Seattle to Philadelphia flight route?

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

What are the cheapest airlines to fly from Seattle to Philadelphia one-way?

What are the most reliable airlines from Seattle to Philadelphia?

What are the cheapest flights from Seattle to Philadelphia?

Where are the most common layover locations when flying from Seattle to Philadelphia?

What are some popular things to do or see while on a layover in Salt Lake City?

Where are the least popular layover locations for Seattle to Philadelphia flights?

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?

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Alternative routes for Seattle to Philadelphia

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Top 9 airlines flying from Seattle to Philadelphia

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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 April 25, 2025.