FlightsFrom Seattle

To Philadelphia

Cheap Flights from Seattle to Philadelphia

Browse current best options from Seattle. Become a member to unlock all deals and get alerts when new deals appear.

Deals from

Seattle

RatePunk searches hundreds of travel sites at once for deals on flights to Philadelphia

Prices updated 24 days ago

486,190 searches this week

171 airlines compared

80%+ AI score for best value

Fares are subject to change and may not be available for all dates. (Data last updated May 29, 2026.)

Today’s best flight deals from Seattle to Philadelphia

Explore current cheapest deals departing from Seattle to Philadelphia

September 9 - September 15

Cheapest
Best

SEA - Philadelphia

$294

$231

Round trip

August 12 - August 18

SEA - Philadelphia

$301

$236

Round trip

July 17 - July 26

Earliest

SEA - Philadelphia

$279

$240

Round trip

August 20 - August 23

SEA - Philadelphia

$318

$240

Round trip

August 7 - August 9

SEA - Philadelphia

$324

$240

Round trip

August 7 - August 11

SEA - Philadelphia

$321

$240

Round trip

August 20 - August 24

SEA - Philadelphia

$318

$240

Round trip

August 21 - August 24

SEA - Philadelphia

$318

$240

Round trip

August 21 - August 25

SEA - Philadelphia

$318

$240

Round trip

August 14 - August 16

SEA - Philadelphia

$319

$240

Round trip

Unlock all 500+ flight deals to Philadelphia and get alerts when great deals appear

Route Intelligence — 486,190 Searches this Week

Insights for flights from Seattle to Philadelphia

A typical journey from Seattle to Philadelphia takes about 18h 24m, including connections. This reflects the reality that most itineraries connect at least once, with connecting flights typically involving 2 stopovers. Only about 20.2% of recent fares for this route are direct flights from Seattle to Philadelphia.
Right now, if you're looking for cheap flights from Seattle to Philadelphia, fares are below the typical level. Prices for this route typically range from $495–$1034, with a median of $707. Currently, only about 2% of recent fares are classified as a good price.
When is the cheapest time to fly from Seattle to Philadelphia? The most affordable months to travel are typically May, with a median fare of $323, followed closely by November and April, both with median fares of $327. New deals appear almost daily for this route, suggesting frequent opportunities to find competitive pricing.
The distance between Seattle and Philadelphia is approximately 3818 kilometers, classifying this as a medium-haul route. This distance contributes to the typical journey time, especially given the prevalence of connecting flights.

How much is a round trip from Seattle to Philadelphia

Regular price: $248 - $361

Prices for flights from Seattle to Philadelphia are currently below the regular range.

The regular price range for this route is between $248 and $361. The current lowest deal is $231 with Southwest Airlines, for travel from Sep 9-Sep 15.

now $231

Low $248

High $361

The cheapest time to fly from Seattle to Philadelphia

The cheapest month to fly from Seattle to Philadelphia is May, with a median price of $323. The most expensive month is June, with a median price of $807. Prices are generally lower from January to November.

May

Cheapest

Flights from $323

June

Most Expensive

Flights from $807

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Direct flights from Seattle to Philadelphia

Airline logo

Alaska Airlines, Inc.

Last-minute flights going from Seattle to Philadelphia

Wed, Jun 17

⌛ Last-Minute

SEA - Philadelphia

American Airlines

Seattle (SEA) - Philadelphia (PHL)

American Airlines

$391

$396

One-way

Wed, Jun 17

⌛ Last-Minute

SEA - Philadelphia

American Airlines

Seattle (SEA) - Philadelphia (PHL)

American Airlines

$458

$396

One-way

Thu, Jun 18

⌛ Last-Minute

SEA - Philadelphia

Frontier Airlines

Seattle (SEA) - Philadelphia (PHL)

Frontier Airlines

$463

$355

One-way

Thu, Jun 18

⌛ Last-Minute

SEA - Philadelphia

Frontier Airlines

Seattle (SEA) - Philadelphia (PHL)

Frontier Airlines

$458

$387

One-way

Fri, Jun 19

⌛ Last-Minute

SEA - Philadelphia

Frontier Airlines

Seattle (SEA) - Philadelphia (PHL)

Frontier Airlines

$458

$350

One-way

Sat, Jun 20

⌛ Last-Minute

SEA - Philadelphia

Frontier Airlines

Seattle (SEA) - Philadelphia (PHL)

Frontier Airlines

$458

$308

One-way

Biggest price drops on these dates for flights from Seattle to Philadelphia

4 nights

Dec 3 - Dec 7

$550  →  $308

44%

4 nights

Dec 9 - Dec 13

$553  →  $313

43%

3 nights

Dec 4 - Dec 7

$550  →  $329

40%

7 nights

Dec 8 - Dec 15

$545  →  $329

40%

Popular Airports to fly from Seattle to Philadelphia

Seattle - Philadelphia route insights

💸 Price insights

Recent fares are below the typical level

Recent fares from Seattle to Philadelphia are below the typical level at $231.

📅 Best time to fly

Fly in May for the cheapest deals

Historically, May offers the lowest median price at $323 for Seattle to Philadelphia.

⏱️ Flight duration

Expect 18h 24m on average

Flights from Seattle to Philadelphia typically take 18h 24m, including layovers.

✈️ Airlines & availability

Connecting flights are dominant

About 20% of deals are direct; connecting flights typically have 2 stopovers.

🏆 Airline highlight

Alaska Airlines, Inc. offers direct flights

Alaska Airlines, Inc. provides direct flight options from Seattle to Philadelphia.

🎯 Booking tip

Deals are frequent for this route

Historically, deals for Seattle to Philadelphia appear frequently, with over 1 per day.

Seattle main airports to depart from

Seattle–Tacoma International (SEA)

Cheapest

Fly from Seattle–Tacoma International for a convenient and affordable option to Philadelphia.

📍 ~18 km from Seattle city center (reachable by car or train)

💸 Flights from ~$231

Boeing Field (BFI)

Consider Boeing Field for flights to Philadelphia, located within Seattle.

📍 ~8 km from Seattle city center (reachable by car)

💸 Flights from ~$715

Kenmore Air Harbor Seaplane Base (LKE)

Kenmore Air Harbor Seaplane Base offers an alternative departure point from Seattle to Philadelphia.

📍 ~3 km from Seattle city center (reachable by car)

💸 Flights from ~$1453

Philadelphia main airports to arrive at

Philadelphia International (PHL)

Cheapest

Philadelphia International Airport is a convenient arrival choice for flights from Seattle to Philadelphia.

📍 ~10 km from city center (reachable by car)

💸 Flights from ~$231

Airports nearby Philadelphia used as alternative

Newark Liberty International (EWR)

Cheapest

Newark Liberty International offers significantly more flight options and excellent international routes.

📍 ~135 km from Philadelphia (reachable by train)

💸 Flights from ~$177

Baltimore–Washington International (BWI)

Baltimore–Washington International is a major Southwest Airlines base with extensive domestic coverage.

📍 ~150 km from Philadelphia (reachable by train)

💸 Flights from ~$226

Trenton–Mercer (TTN)

Trenton–Mercer provides a very fast check-in and security process for budget-friendly options.

📍 ~50 km from Philadelphia (reachable by car)

💸 Flights from ~$410

Lehigh Valley International (ABE)

Lehigh Valley International is less crowded and offers reliable regional connections.

📍 ~85 km from Philadelphia (reachable by car)

💸 Flights from ~$301

Atlantic City International (ACY)

Atlantic City International is convenient for specific low-cost leisure routes and easy to navigate.

📍 ~90 km from Philadelphia (reachable by car)

💸 Flights from ~$423

Business & First Class Flight Deals to Philadelphia

Discover luxury on the budget with premium cabin class on flights from Seattle to Philadelphia.

Elite

Best Elite deals to Philadelphia

Exclusive daily First Class, Business Class, and Premium Economy flight deals, refreshed every 24 hours.

From SEA

Elite

Nov 07

Philadelphia, United States

92% AI deal score

$2,077

$1,093

Save $984

From SEA

Elite

Dec 04

Philadelphia, United States

91% AI deal score

$1,826

$1,099

Save $727

From SEA

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Nov 18

Philadelphia, United States

91% AI deal score

$1,963

$1,159

Save $804

From SEA

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Nov 16

Philadelphia, United States

91% AI deal score

$1,948

$1,159

Save $789

From SEA

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Nov 14

Philadelphia, United States

91% AI deal score

$1,948

$1,159

Save $789

From SEA

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Nov 14

Philadelphia, United States

91% AI deal score

$1,911

$1,159

Save $752

From SEA

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Nov 11

Philadelphia, United States

91% AI deal score

$1,900

$1,159

Save $741

From SEA

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Sep 20

Philadelphia, United States

91% AI deal score

$1,729

$952

Save $777

From SEA

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Aug 26

Philadelphia, United States

91% AI deal score

$1,701

$965

Save $736

From SEA

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Sep 01

Philadelphia, United States

90% AI deal score

$2,008

$1,163

Save $845

From SEA

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Sep 01

Philadelphia, United States

90% AI deal score

$1,994

$1,163

Save $831

From SEA

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Oct 10

Philadelphia, United States

90% AI deal score

$1,678

$1,083

Save $595

From SEA

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Dec 01

Philadelphia, United States

90% AI deal score

$1,747

$1,157

Save $590

From SEA

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Nov 15

Philadelphia, United States

90% AI deal score

$1,814

$1,159

Save $655

From SEA

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Nov 18

Philadelphia, United States

90% AI deal score

$1,814

$1,159

Save $655

From SEA

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Nov 15

Philadelphia, United States

90% AI deal score

$1,814

$1,159

Save $655

From SEA

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Nov 11

Philadelphia, United States

90% AI deal score

$1,869

$1,159

Save $710

From SEA

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Nov 14

Philadelphia, United States

90% AI deal score

$1,826

$1,159

Save $667

From SEA

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Nov 10

Philadelphia, United States

90% AI deal score

$1,815

$1,159

Save $656

From SEA

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Nov 16

Philadelphia, United States

90% AI deal score

$1,826

$1,159

Save $667

From SEA

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Nov 15

Philadelphia, United States

90% AI deal score

$1,814

$1,159

Save $655

From SEA

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Nov 01

Philadelphia, United States

90% AI deal score

$1,815

$1,159

Save $656

From SEA

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Nov 15

Philadelphia, United States

90% AI deal score

$1,814

$1,159

Save $655

From SEA

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Nov 04

Philadelphia, United States

90% AI deal score

$1,816

$1,159

Save $657

From SEA

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Nov 14

Philadelphia, United States

90% AI deal score

$1,814

$1,159

Save $655

From SEA

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Nov 16

Philadelphia, United States

90% AI deal score

$1,814

$1,159

Save $655

From SEA

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Nov 18

Philadelphia, United States

90% AI deal score

$1,814

$1,159

Save $655

From SEA

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Nov 02

Philadelphia, United States

90% AI deal score

$1,815

$1,159

Save $656

From SEA

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Nov 01

Philadelphia, United States

90% AI deal score

$1,815

$1,159

Save $656

From SEA

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Nov 12

Philadelphia, United States

90% AI deal score

$1,814

$1,159

Save $655

From SEA

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Nov 16

Philadelphia, United States

90% AI deal score

$1,814

$1,159

Save $655

From SEA

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Nov 06

Philadelphia, United States

90% AI deal score

$1,815

$1,159

Save $656

From SEA

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Nov 12

Philadelphia, United States

90% AI deal score

$1,814

$1,159

Save $655

From SEA

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Nov 11

Philadelphia, United States

90% AI deal score

$1,814

$1,159

Save $655

From SEA

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Nov 14

Philadelphia, United States

90% AI deal score

$1,814

$1,159

Save $655

From SEA

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Nov 07

Philadelphia, United States

90% AI deal score

$1,815

$1,159

Save $656

From SEA

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Nov 02

Philadelphia, United States

90% AI deal score

$1,815

$1,159

Save $656

From SEA

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Nov 10

Philadelphia, United States

90% AI deal score

$1,815

$1,159

Save $656

From SEA

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Nov 18

Philadelphia, United States

90% AI deal score

$1,826

$1,159

Save $667

From SEA

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Nov 04

Philadelphia, United States

90% AI deal score

$1,827

$1,159

Save $668

From SEA

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Nov 15

Philadelphia, United States

90% AI deal score

$1,829

$1,159

Save $670

From SEA

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Oct 06

Philadelphia, United States

90% AI deal score

$1,649

$971

Save $678

From SEA

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Oct 07

Philadelphia, United States

90% AI deal score

$1,660

$971

Save $689

From SEA

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Aug 13

Philadelphia, United States

90% AI deal score

$1,692

$974

Save $718

From SEA

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Sep 10

Philadelphia, United States

90% AI deal score

$1,656

$983

Save $673

From SEA

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Aug 14

Philadelphia, United States

90% AI deal score

$1,678

$1,010

Save $668

From SEA

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Aug 14

Philadelphia, United States

90% AI deal score

$1,686

$1,010

Save $676

From SEA

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Aug 13

Philadelphia, United States

90% AI deal score

$1,666

$1,017

Save $649

From SEA

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Jul 10

Philadelphia, United States

90% AI deal score

$1,659

$1,048

Save $611

From SEA

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Jun 17

Philadelphia, United States

90% AI deal score

$1,523

$1,053

Save $470

From SEA

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Jun 17

Philadelphia, United States

90% AI deal score

$1,555

$1,053

Save $502

From SEA

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Aug 11

Philadelphia, United States

89% AI deal score

$1,752

$1,164

Save $588

From SEA

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Dec 10

Philadelphia, United States

89% AI deal score

$1,670

$1,159

Save $511

From SEA

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Dec 03

Philadelphia, United States

89% AI deal score

$1,678

$1,159

Save $519

From SEA

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Dec 09

Philadelphia, United States

89% AI deal score

$1,659

$1,159

Save $500

From SEA

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Jul 09

Philadelphia, United States

89% AI deal score

$1,486

$996

Save $490

From SEA

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Aug 05

Philadelphia, United States

89% AI deal score

$1,666

$1,017

Save $649

From SEA

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Aug 13

Philadelphia, United States

89% AI deal score

$1,664

$1,018

Save $646

From SEA

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Oct 15

Philadelphia, United States

89% AI deal score

$1,649

$1,021

Save $628

From SEA

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Dec 04

Philadelphia, United States

88% AI deal score

$1,552

$1,097

Save $455

From SEA

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Nov 23

Philadelphia, United States

88% AI deal score

$1,560

$1,067

Save $493

From SEA

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Dec 03

Philadelphia, United States

87% AI deal score

$1,504

$1,097

Save $407

From SEA

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Aug 03

Philadelphia, United States

87% AI deal score

$1,607

$1,169

Save $438

From SEA

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Aug 03

Philadelphia, United States

87% AI deal score

$1,603

$1,169

Save $434

From SEA

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Sep 29

Philadelphia, United States

87% AI deal score

$1,547

$1,159

Save $388

From SEA

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Oct 02

Philadelphia, United States

86% AI deal score

$1,617

$1,213

Save $404

From SEA

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Oct 01

Philadelphia, United States

86% AI deal score

$1,626

$1,213

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From SEA

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Aug 06

Philadelphia, United States

86% AI deal score

$1,614

$1,213

Save $401

From SEA

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Sep 01

Philadelphia, United States

86% AI deal score

$1,477

$1,159

Save $318

From SEA

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Sep 29

Philadelphia, United States

86% AI deal score

$1,479

$1,159

Save $320

From SEA

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Jun 18

Philadelphia, United States

86% AI deal score

$1,538

$1,242

Save $296

From SEA

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Oct 06

Philadelphia, United States

85% AI deal score

$1,502

$1,159

Save $343

From SEA

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Oct 04

Philadelphia, United States

85% AI deal score

$1,494

$1,159

Save $335

From SEA

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Oct 05

Philadelphia, United States

85% AI deal score

$1,497

$1,160

Save $337

From SEA

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Sep 29

Philadelphia, United States

85% AI deal score

$1,419

$1,159

Save $260

From SEA

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Sep 29

Philadelphia, United States

85% AI deal score

$1,419

$1,159

Save $260

From SEA

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Aug 12

Philadelphia, United States

85% AI deal score

$1,385

$1,164

Save $221

From SEA

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Aug 12

Philadelphia, United States

85% AI deal score

$1,388

$1,164

Save $224

From SEA

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Aug 12

Philadelphia, United States

85% AI deal score

$1,372

$1,164

Save $208

From SEA

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Jul 04

Philadelphia, United States

84% AI deal score

$1,533

$1,227

Save $306

From SEA

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Nov 27

Philadelphia, United States

80% AI deal score

$1,379

$1,166

Save $213

From SEA

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Jul 29

Philadelphia, United States

80% AI deal score

$1,452

$1,169

Save $283

From SEA

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Jul 29

Philadelphia, United States

80% AI deal score

$1,429

$1,170

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From SEA

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Jul 08

Philadelphia, United States

80% AI deal score

$1,495

$1,203

Save $292

From SEA

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Jul 15

Philadelphia, United States

80% AI deal score

$1,481

$1,203

Save $278

From SEA

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Jul 22

Philadelphia, United States

80% AI deal score

$1,479

$1,205

Save $274

From SEA

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Jul 08

Philadelphia, United States

80% AI deal score

$1,559

$1,207

Save $352

From SEA

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Jul 08

Philadelphia, United States

80% AI deal score

$1,492

$1,208

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From SEA

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Jul 15

Philadelphia, United States

80% AI deal score

$1,472

$1,208

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From SEA

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Jul 08

Philadelphia, United States

80% AI deal score

$1,484

$1,208

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From SEA

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Oct 15

Philadelphia, United States

80% AI deal score

$1,548

$1,213

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From SEA

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Jul 15

Philadelphia, United States

79% AI deal score

$1,431

$1,208

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Jul 15

Philadelphia, United States

79% AI deal score

$1,433

$1,208

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From SEA

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Jul 15

Philadelphia, United States

79% AI deal score

$1,458

$1,208

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From SEA

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Aug 03

Philadelphia, United States

79% AI deal score

$1,540

$1,288

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Jul 24

Philadelphia, United States

78% AI deal score

$1,567

$1,310

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From SEA

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Nov 21

Philadelphia, United States

77% AI deal score

$1,350

$1,212

Save $138

From SEA

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Jul 29

Philadelphia, United States

77% AI deal score

$1,422

$1,289

Save $133

From SEA

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Aug 30

Philadelphia, United States

77% AI deal score

$1,393

$1,283

Save $110

From SEA

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Aug 12

Philadelphia, United States

77% AI deal score

$1,403

$1,288

Save $115

Frequently Asked Questions About Flights to Philadelphia

Historically, the optimal time to book flights from Seattle to Philadelphia is within 0-6 days of departure, with an average price of $400. Booking 7-13 days out typically sees an average price of $478. Prices tend to be significantly higher when booking further in advance, such as $1680 for flights booked 14-27 days out or $1452 for flights booked 28-59 days out. For the best value, consider booking closer to your travel date.

Across the trailing quarter, a flight from Seattle to Philadelphia is considered a good deal if the price is at or below $495. The median price for this route historically stands at $707. Prices above $1034 are typically in the higher range. By aiming for prices under $495, travelers can secure a favorable fare.

Historically, the cheapest months to fly from Seattle to Philadelphia include May, November, and April. During these months, the median prices are around $323 for May and $327 for both November and April. This is significantly lower than the annual median price of $707 for this route. Travelers looking for the most economical options should consider these months.