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฿4,308+ Direct flights from Philadelphia

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 27/5. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
PHL — BKK
31 Mar — 7 Apr1
1 adult
1 adult, Economy, 0 bags

Direct flights from Philadelphia

Enter your travel dates to find the best prices.

Cheapest flights from Philadelphia
Explore the most affordable flight options available from Philadelphia. Find the lowest fares based on data from user searches, with prices last updated on 1 March 2026.

Sat 9/507:10
PHL
-
SEA
Nonstop5h 50m
เดลต้า
Sun 17/521:20
SEA
-
PHL
Nonstop5h 17m
เดลต้า
Deal found 25/2฿7,655
Fri 15/507:10
PHL
-
SEA
Nonstop5h 50m
เดลต้า
Mon 25/521:20
SEA
-
PHL
Nonstop5h 17m
เดลต้า
Deal found 26/2฿8,337
Sun 31/507:10
PHL
-
SEA
Nonstop5h 50m
เดลต้า
Wed 10/621:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 25/2฿8,461
Sun 24/507:10
PHL
-
SEA
Nonstop5h 50m
เดลต้า
Mon 1/621:20
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 25/2฿8,585
Tue 12/507:10
PHL
-
SEA
Nonstop5h 50m
เดลต้า
Fri 15/521:20
SEA
-
PHL
Nonstop5h 17m
เดลต้า
Deal found 25/2฿9,205
Sat 15/807:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Sun 23/821:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 25/2฿9,546
Sun 10/507:10
PHL
-
SEA
Nonstop5h 50m
เดลต้า
Thu 14/521:20
SEA
-
PHL
Nonstop5h 17m
เดลต้า
Deal found 26/2฿9,577
Mon 30/318:47
PHL
-
SEA
Nonstop6h 05m
อลาสกาแอร์ไลน์
Sun 12/421:55
SEA
-
PHL
Nonstop5h 10m
อลาสกาแอร์ไลน์
Deal found 26/2฿9,670
Fri 8/518:58
PHL
-
SEA
Nonstop6h 04m
อลาสกาแอร์ไลน์
Mon 18/521:22
SEA
-
PHL
Nonstop5h 13m
อลาสกาแอร์ไลน์
Deal found 25/2฿10,134
Sat 16/507:10
PHL
-
SEA
Nonstop5h 50m
เดลต้า
Sun 24/521:20
SEA
-
PHL
Nonstop5h 17m
เดลต้า
Deal found 28/2฿10,320
Sat 18/707:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Tue 28/721:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 26/2฿10,351

Find direct flights from Philadelphia within your budget

 
Use the slider to find direct flights from Philadelphia within your budget. Price data is based on user searches made on Cheapflights. Over the past seven days, Cheapflights users made 17,341 searches. This data was last updated on 1 March 2026.

Fly to

Route

Depart

Return

Price

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sat 9/5

07:10-10:00

Nonstop5h 50m

Seattle/Tacoma Intl

Sun 17/5

21:20-05:37

Nonstop5h 17m

฿7,655

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sat 22/8

07:05-10:04

Nonstop5h 59m

Seattle/Tacoma Intl

Wed 26/8

21:50-06:05

Nonstop5h 15m

฿8,337

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 10/6

07:05-10:04

Nonstop5h 59m

Seattle/Tacoma Intl

Wed 24/6

21:50-06:05

Nonstop5h 15m

฿8,337

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 14/5

07:10-10:00

Nonstop5h 50m

Seattle/Tacoma Intl

Sun 17/5

21:20-05:37

Nonstop5h 17m

฿8,337

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 15/5

07:10-10:00

Nonstop5h 50m

Seattle/Tacoma Intl

Mon 18/5

21:20-05:37

Nonstop5h 17m

฿8,337

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Mon 1/6

07:10-10:00

Nonstop5h 50m

Seattle/Tacoma Intl

Wed 10/6

21:50-06:05

Nonstop5h 15m

฿8,337

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 28/5

07:10-10:00

Nonstop5h 50m

Seattle/Tacoma Intl

Mon 1/6

21:20-05:35

Nonstop5h 15m

฿8,337

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 13/5

07:10-10:00

Nonstop5h 50m

Seattle/Tacoma Intl

Sat 16/5

21:20-05:37

Nonstop5h 17m

฿8,337

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 20/5

07:10-10:00

Nonstop5h 50m

Seattle/Tacoma Intl

Wed 27/5

21:20-05:37

Nonstop5h 17m

฿8,337

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 15/5

07:10-10:00

Nonstop5h 50m

Seattle/Tacoma Intl

Sat 23/5

21:20-05:37

Nonstop5h 17m

฿8,461

Flights are sorted by cheapest return flights first.

Deals found on 25/2

Showing 1-10 of 19 resultsSorted by cheapest first
1
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Best time to book a flight from Philadelphia

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

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