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฿4,343+ 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 18/2. 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
22 Feb — 1 Mar1
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 23 January 2026.

Sat 21/307:25
PHL
-
SEA
Nonstop6h 05m
อลาสกาแอร์ไลน์
Wed 25/321:55
SEA
-
PHL
Nonstop5h 10m
อลาสกาแอร์ไลน์
Deal found 22/1฿7,405
Fri 15/507:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Sat 23/521:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 21/1฿8,029
Tue 21/407:25
PHL
-
SEA
Nonstop6h 05m
อลาสกาแอร์ไลน์
Fri 24/421:44
SEA
-
PHL
Nonstop5h 18m
อลาสกาแอร์ไลน์
Deal found 22/1฿8,654
Fri 15/507:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Mon 25/521:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 22/1฿9,123
Wed 18/218:20
PHL
-
SEA
Nonstop6h 13m
อลาสกาแอร์ไลน์
Sat 21/209:16
SEA
-
PHL
Nonstop5h 04m
อลาสกาแอร์ไลน์
Deal found 20/1฿9,592
Sat 23/507:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Sun 24/521:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 21/1฿9,904
Sat 18/407:25
PHL
-
SEA
Nonstop6h 05m
อลาสกาแอร์ไลน์
Thu 23/409:32
SEA
-
PHL
Nonstop5h 26m
อลาสกาแอร์ไลน์
Deal found 22/1฿10,216
Fri 22/507:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Mon 25/521:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 21/1฿10,841
Mon 29/607:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Tue 14/721:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 21/1฿11,154
Thu 2/407:25
PHL
-
SEA
Nonstop6h 05m
อลาสกาแอร์ไลน์
Sun 5/421:55
SEA
-
PHL
Nonstop5h 10m
อลาสกาแอร์ไลน์
Deal found 22/1฿11,466
Thu 4/607:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Sun 7/621:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 22/1฿11,935

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 23 January 2026.

Fly to

Suvarnabhumi

Route

Depart

Return

Price

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sat 4/4

18:47-21:52

Nonstop6h 05m

Seattle/Tacoma Intl

Tue 7/4

21:55-06:05

Nonstop5h 10m

฿7,405

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Mon 11/5

07:05-10:04

Nonstop5h 59m

Seattle/Tacoma Intl

Mon 18/5

21:50-06:05

Nonstop5h 15m

฿7,405

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sat 21/3

07:25-10:30

Nonstop6h 05m

Seattle/Tacoma Intl

Wed 25/3

21:55-06:05

Nonstop5h 10m

฿7,405

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 8/5

07:05-10:04

Nonstop5h 59m

Seattle/Tacoma Intl

Sat 16/5

21:50-06:05

Nonstop5h 15m

฿7,405

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 14/5

07:05-10:04

Nonstop5h 59m

Seattle/Tacoma Intl

Tue 19/5

21:50-06:05

Nonstop5h 15m

฿7,405

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sat 4/4

18:47-21:52

Nonstop6h 05m

Seattle/Tacoma Intl

Sun 5/4

21:55-06:05

Nonstop5h 10m

฿8,029

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 15/5

07:05-10:04

Nonstop5h 59m

Seattle/Tacoma Intl

Tue 26/5

21:50-06:05

Nonstop5h 15m

฿8,029

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 8/4

07:25-10:30

Nonstop6h 05m

Seattle/Tacoma Intl

Sun 12/4

21:55-06:05

Nonstop5h 10m

฿8,029

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sun 22/3

07:25-10:30

Nonstop6h 05m

Seattle/Tacoma Intl

Thu 26/3

21:55-06:05

Nonstop5h 10m

฿8,654

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sat 23/5

19:17-22:29

Nonstop6h 12m

Seattle/Tacoma Intl

Sun 31/5

21:27-05:40

Nonstop5h 13m

฿8,654

Flights are sorted by cheapest return flights first.

Deals found on 21/1

Showing 1-10 of 21 results
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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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