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Flight Deals from Philadelphia to Seattle from $140

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Stops

  • Up to 1 stop
    $399
  • Up to nonstop
    $980

Airlines

  • Alaska Airlines
    $980
  • American Airlines
    $483
  • United Airlines
    $509
  • Virgin Atlantic
    $399

Cabin Class

  • Economy
    $399

Departure Airports

  • Philadelphia International Airport
    $399

Arrival Airports

  • Seattle Tacoma International Airport
    $399

Layover Airports

  • Charlotte Douglas International Airport
    $483
  • Chicago O Hare Airport
    $509
  • Detroit Metropolitan Airport
    $399
  • Salt Lake City International Airport
    $399
  • San Francisco International Airport
    $509

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Delta Air Lines Logo
Delta Air Lines

12/02/26

PHL
8h 24m
SLC

12/02/26

SEA
Delta Air Lines Logo
Delta Air Lines

12/02/26

SEA
6h 36m
DTW

12/03/26

PHL
$399
American Airlines Logo
American Airlines

12/02/26

PHL
8h 48m
CLT

12/02/26

SEA
American Airlines Logo
American Airlines

12/02/26

SEA
4h 55m
Direct

12/03/26

PHL
$483
United Airlines Logo
United Airlines

12/02/26

PHL
9h 2m
SFO

12/02/26

SEA
United Airlines Logo
United Airlines

12/02/26

SEA
8h 47m
ORD

12/03/26

PHL
$509
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Book a flight & hotel together for extra savings.
On average save $240 per traveler
American Airlines Logo
American Airlines

07/28/26

PHL
6h 14m
Direct

07/28/26

SEA
American Airlines Logo
American Airlines

08/03/26

SEA
11h 54m
ORD

08/04/26

PHL
$604
Alaska Airlines Logo
Alaska Airlines

11/28/26

PHL
6h 1m
Direct

11/28/26

SEA
Alaska Airlines Logo
Alaska Airlines

11/30/26

SEA
5h 12m
Direct

12/01/26

PHL
$980
United Airlines Logo
United Airlines

12/02/26

PHL
8h 30m
ORD

12/02/26

SEA
United Airlines Logo
United Airlines

12/02/26

SEA
8h 47m
ORD

12/03/26

PHL
$1165

Top Deals on flights from Philadelphia to Seattle

Philadelphia, US (PHL) - Seattle, US (SEA)

American Airlines Logo
American Airlines

Apr 22

PHL
6h 9m
Direct

Apr 22

SEA

as low as

$140

Philadelphia, US (PHL) - Seattle, US (SEA)

Alaska Airlines Logo
Alaska Airlines

Apr 23

PHL
5h 58m
Direct

Apr 23

SEA

as low as

$140

Philadelphia, US (PHL) - Seattle, US (SEA)

United Airlines Logo
United Airlines

Apr 23

PHL
8h 26m
DEN

Apr 23

SEA

as low as

$150

Philadelphia, US (PHL) - Seattle, US (SEA)

 Logo

Aug 23

PHL
9h 55m
STL

Aug 23

SEA

as low as

$174

Philadelphia, US (PHL) - Seattle, US (SEA)

Alaska Airlines Logo
Alaska Airlines

Dec 2

PHL
8h 45m
PDX

Dec 2

SEA

as low as

$175

Philadelphia, US (PHL) - Seattle, US (SEA)

Delta Air Lines Logo
Delta Air Lines

Dec 2

PHL
7h 44m
MSP

Dec 2

SEA

as low as

$183

Philadelphia, US (PHL) - Seattle, US (SEA)

 Logo

Aug 24

PHL
7h 49m
MSP

Aug 24

SEA

as low as

$228

Philadelphia, US (PHL) - Seattle, US (SEA)

Alaska Airlines Logo
Alaska Airlines

Dec 2

PHL
6h 9m
Direct

Dec 2

SEA

as low as

$280

Philadelphia, US (PHL) - Seattle, US (SEA)

United Airlines Logo
United Airlines

Dec 2

PHL
9h 2m
SFO

Dec 2

SEA

as low as

$290

Philadelphia, US (PHL) - Seattle, US (SEA)

 Logo

Aug 23

PHL
23h 10m
BNA

Aug 24

SEA

as low as

$350

Philadelphia, US (PHL) - Seattle, US (SEA)

American Airlines Logo
American Airlines

Dec 2

PHL
12h 19m
ORD

Dec 2

SEA

as low as

$402

Philadelphia, US (PHL) - Seattle, US (SEA)

 Logo

May 24

PHL
27h 56m
BOS

May 25

SEA

as low as

$514

Good to Know

Essential information to help you plan your flight from Philadelphia to Seattle

Cheapest Flight

$140

The lowest price we found in the last two weeks, departing Apr 22 and returning Apr 22

Airline AA6h 9m ‧ economy

Fastest Flights

$140

The fastest flight that we found in the last two weeks, departing Apr 23 and returning Apr 23

Airline AS5h 58m ‧ economy

Cheapest Flight Round-trip

$399

Cheapest price found in the last 14 days, departing Dec 2 and returning Dec 3

Airline VS1 stop ‧ 8h 24m ‧ economy

Cheapest Flight One-way

$140

Cheapest price found in the last 14 days, departing Apr 22

Airline AA6h 9m ‧ economy

Cheapest Layover airport

$290

The cheapest layover airport to Seattle is currently $290

Airline UA1 stop ‧ 9h 2m ‧ economy

Best Arrival airport

$140

The best arrival airport to Seattle is currently $140

Airline AS5h 58m ‧ economy

Best Departure airport

$140

The best departure airport to Seattle is currently $140

Airline AS5h 58m ‧ economy

Cheapest Airline

$140

The cheapest airline to Seattle is currently $140

Airline AS5h 58m ‧ economy

Flights to Seattle