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฿3,693+ 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 12/5. 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
28 Feb — 7 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 29 January 2026.

Mon 16/318:22
PHL
-
SEA
Nonstop6h 13m
อลาสกาแอร์ไลน์
Sun 22/321:55
SEA
-
PHL
Nonstop5h 10m
อลาสกาแอร์ไลน์
Deal found 26/1฿7,355
Tue 12/507:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Fri 15/521:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 26/1฿7,976
Fri 15/507:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Mon 25/521:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 28/1฿8,597
Fri 22/507:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Sat 23/521:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 27/1฿9,683
Fri 3/418:47
PHL
-
SEA
Nonstop6h 05m
อลาสกาแอร์ไลน์
Tue 7/421:55
SEA
-
PHL
Nonstop5h 10m
อลาสกาแอร์ไลน์
Deal found 28/1฿9,838
Fri 22/507:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Wed 27/521:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 28/1฿10,149
Wed 27/507:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Tue 4/821:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 29/1฿10,304
Mon 23/218:20
PHL
-
SEA
Nonstop6h 13m
อลาสกาแอร์ไลน์
Tue 3/309:16
SEA
-
PHL
Nonstop5h 04m
อลาสกาแอร์ไลน์
Deal found 26/1฿10,459
Tue 23/607:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Wed 1/721:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 27/1฿10,769
Fri 29/519:17
PHL
-
SEA
Nonstop6h 12m
อลาสกาแอร์ไลน์
Wed 29/721:36
SEA
-
PHL
Nonstop5h 14m
อลาสกาแอร์ไลน์
Deal found 29/1฿11,235
Wed 27/507:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Fri 31/721:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 29/1฿11,700
Thu 28/507:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Thu 30/721:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 29/1฿11,856

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 29 January 2026.

Fly to

Suvarnabhumi

Route

Depart

Return

Price

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 18/3

18:47-21:52

Nonstop6h 05m

Seattle/Tacoma Intl

Sun 22/3

21:55-06:05

Nonstop5h 10m

฿7,355

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Tue 19/5

07:05-10:04

Nonstop5h 59m

Seattle/Tacoma Intl

Tue 26/5

21:50-06:05

Nonstop5h 15m

฿8,597

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 29/5

19:17-22:29

Nonstop6h 12m

Seattle/Tacoma Intl

Mon 1/6

21:27-05:40

Nonstop5h 13m

฿8,597

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Mon 11/5

07:05-10:04

Nonstop5h 59m

Seattle/Tacoma Intl

Fri 15/5

21:50-06:05

Nonstop5h 15m

฿8,597

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 18/3

18:47-21:52

Nonstop6h 05m

Seattle/Tacoma Intl

Sat 21/3

21:55-06:05

Nonstop5h 10m

฿8,597

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sun 10/5

07:05-10:04

Nonstop5h 59m

Seattle/Tacoma Intl

Fri 15/5

21:50-06:05

Nonstop5h 15m

฿8,597

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 15/5

07:05-10:04

Nonstop5h 59m

Seattle/Tacoma Intl

Mon 25/5

21:50-06:05

Nonstop5h 15m

฿8,597

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 29/5

19:17-22:29

Nonstop6h 12m

Seattle/Tacoma Intl

Wed 3/6

21:27-05:40

Nonstop5h 13m

฿8,597

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 28/5

07:05-10:04

Nonstop5h 59m

Seattle/Tacoma Intl

Mon 1/6

21:50-06:05

Nonstop5h 15m

฿8,597

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 29/5

19:17-22:29

Nonstop6h 12m

Seattle/Tacoma Intl

Tue 2/6

21:27-05:40

Nonstop5h 13m

฿8,597

Flights are sorted by cheapest return flights first.

Deals found on 26/1

Showing 1-10 of 22 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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