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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 13/5. 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
20 Mar — 27 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 18 February 2026.

Fri 15/506:59
PHL
-
SEA
Nonstop5h 51m
เดลต้า
Mon 25/521:27
SEA
-
PHL
Nonstop5h 17m
เดลต้า
Deal found 18/2฿8,656
Thu 7/506:59
PHL
-
SEA
Nonstop5h 51m
เดลต้า
Wed 13/521:27
SEA
-
PHL
Nonstop5h 17m
เดลต้า
Deal found 17/2฿9,281
Wed 3/606:59
PHL
-
SEA
Nonstop5h 49m
เดลต้า
Fri 12/621:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 18/2฿9,749
Sun 10/506:59
PHL
-
SEA
Nonstop5h 51m
เดลต้า
Thu 14/521:27
SEA
-
PHL
Nonstop5h 17m
เดลต้า
Deal found 18/2฿9,906
Fri 10/407:25
PHL
-
SEA
Nonstop6h 05m
อลาสกาแอร์ไลน์
Fri 17/421:55
SEA
-
PHL
Nonstop5h 10m
อลาสกาแอร์ไลน์
Deal found 17/2฿10,218
Thu 4/606:59
PHL
-
SEA
Nonstop5h 49m
เดลต้า
Mon 8/621:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 17/2฿10,374
Sun 10/506:59
PHL
-
SEA
Nonstop5h 51m
เดลต้า
Fri 15/521:27
SEA
-
PHL
Nonstop5h 17m
เดลต้า
Deal found 17/2฿10,531
Sat 16/506:59
PHL
-
SEA
Nonstop5h 51m
เดลต้า
Thu 28/521:27
SEA
-
PHL
Nonstop5h 17m
เดลต้า
Deal found 18/2฿10,843
Sun 16/807:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Sat 17/1021:50
SEA
-
PHL
Nonstop5h 13m
เดลต้า
Deal found 15/2฿10,874
Fri 5/606:59
PHL
-
SEA
Nonstop5h 49m
เดลต้า
Sun 14/621:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 15/2฿11,156
Fri 8/507:22
PHL
-
SEA
Nonstop5h 58m
อลาสกาแอร์ไลน์
Mon 18/521:22
SEA
-
PHL
Nonstop5h 13m
อลาสกาแอร์ไลน์
Deal found 17/2฿11,312
Wed 8/707:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Wed 22/721:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 16/2฿11,468

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 18 February 2026.

Fly to

Suvarnabhumi

Route

Depart

Return

Price

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 28/5

06:59-09:50

Nonstop5h 51m

Seattle/Tacoma Intl

Wed 3/6

21:27-05:42

Nonstop5h 15m

฿8,656

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 25/3

18:47-21:52

Nonstop6h 05m

Seattle/Tacoma Intl

Tue 31/3

21:55-06:05

Nonstop5h 10m

฿8,656

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sat 2/5

18:58-22:02

Nonstop6h 04m

Seattle/Tacoma Intl

Wed 13/5

21:22-05:35

Nonstop5h 13m

฿8,656

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 28/5

06:59-09:50

Nonstop5h 51m

Seattle/Tacoma Intl

Tue 2/6

21:27-05:42

Nonstop5h 15m

฿8,656

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 7/5

06:59-09:50

Nonstop5h 51m

Seattle/Tacoma Intl

Thu 14/5

21:27-05:44

Nonstop5h 17m

฿8,656

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 14/5

06:59-09:50

Nonstop5h 51m

Seattle/Tacoma Intl

Sun 24/5

21:27-05:44

Nonstop5h 17m

฿8,656

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 8/5

06:59-09:50

Nonstop5h 51m

Seattle/Tacoma Intl

Thu 14/5

21:27-05:44

Nonstop5h 17m

฿8,656

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 28/5

06:59-09:50

Nonstop5h 51m

Seattle/Tacoma Intl

Mon 1/6

21:27-05:42

Nonstop5h 15m

฿8,656

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sun 10/5

06:59-09:50

Nonstop5h 51m

Seattle/Tacoma Intl

Sun 17/5

21:27-05:44

Nonstop5h 17m

฿8,656

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 7/5

06:59-09:50

Nonstop5h 51m

Seattle/Tacoma Intl

Mon 11/5

21:27-05:44

Nonstop5h 17m

฿8,656

Flights are sorted by cheapest return flights first.

Deals found on 14/2

Showing 1-10 of 15 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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