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฿4,765+ 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 2/6. 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
9 Apr — 16 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 10 March 2026.

Fri 15/507:10
PHL
-
SEA
Nonstop5h 50m
เดลต้า
Mon 18/521:20
SEA
-
PHL
Nonstop5h 17m
เดลต้า
Deal found 9/3฿9,243
Tue 18/807:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Tue 15/1221:50
SEA
-
PHL
Nonstop5h 13m
เดลต้า
Deal found 8/3฿9,275
Mon 6/418:47
PHL
-
SEA
Nonstop6h 05m
อลาสกาแอร์ไลน์
Mon 20/421:55
SEA
-
PHL
Nonstop5h 10m
อลาสกาแอร์ไลน์
Deal found 9/3฿9,499
Tue 18/807:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Mon 12/1021:50
SEA
-
PHL
Nonstop5h 13m
เดลต้า
Deal found 10/3฿9,883
Sun 5/418:47
PHL
-
SEA
Nonstop6h 05m
อลาสกาแอร์ไลน์
Wed 15/421:55
SEA
-
PHL
Nonstop5h 10m
อลาสกาแอร์ไลน์
Deal found 6/3฿10,490
Mon 20/418:47
PHL
-
SEA
Nonstop6h 05m
อลาสกาแอร์ไลน์
Wed 22/421:44
SEA
-
PHL
Nonstop5h 18m
อลาสกาแอร์ไลน์
Deal found 8/3฿10,522
Wed 19/817:56
PHL
-
SEA
Nonstop6h 09m
อลาสกาแอร์ไลน์
Mon 14/1208:46
SEA
-
PHL
Nonstop5h 10m
อลาสกาแอร์ไลน์
Deal found 8/3฿10,554
Fri 3/418:47
PHL
-
SEA
Nonstop6h 05m
อลาสกาแอร์ไลน์
Tue 9/621:22
SEA
-
PHL
Nonstop5h 13m
อลาสกาแอร์ไลน์
Deal found 6/3฿10,618
Tue 31/307:25
PHL
-
SEA
Nonstop6h 05m
อลาสกาแอร์ไลน์
Tue 31/321:55
SEA
-
PHL
Nonstop5h 10m
อลาสกาแอร์ไลน์
Deal found 5/3฿10,778
Thu 4/607:10
PHL
-
SEA
Nonstop5h 50m
เดลต้า
Thu 11/621:50
SEA
-
PHL
Nonstop5h 15m
เดลต้า
Deal found 9/3฿10,970
Sun 16/807:05
PHL
-
SEA
Nonstop5h 59m
เดลต้า
Mon 14/1221:50
SEA
-
PHL
Nonstop5h 13m
เดลต้า
Deal found 8/3฿11,002
Mon 18/507:10
PHL
-
SEA
Nonstop5h 50m
เดลต้า
Tue 19/521:20
SEA
-
PHL
Nonstop5h 17m
เดลต้า
Deal found 9/3฿11,098

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 10 March 2026.

Fly to

Route

Depart

Return

Price

Cheapest return flight

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 8/4

18:47-21:52

Nonstop6h 05m

Seattle/Tacoma Intl

Mon 8/6

21:22-05:35

Nonstop5h 13m

฿9,243

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 13/5

07:10-10:00

Nonstop5h 50m

Seattle/Tacoma Intl

Sat 23/5

21:20-05:37

Nonstop5h 17m

฿9,243

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 16/4

07:25-10:30

Nonstop6h 05m

Seattle/Tacoma Intl

Sun 19/4

21:55-06:05

Nonstop5h 10m

฿9,243

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Tue 12/5

07:10-10:00

Nonstop5h 50m

Seattle/Tacoma Intl

Fri 22/5

21:20-05:37

Nonstop5h 17m

฿9,243
Fastest return journey

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 29/5

07:10-10:00

Nonstop5h 50m

Seattle/Tacoma Intl

Tue 2/6

21:20-05:35

Nonstop5h 15m

฿9,243

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 24/6

07:05-10:04

Nonstop5h 59m

Seattle/Tacoma Intl

Fri 3/7

21:50-06:05

Nonstop5h 15m

฿9,243

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

฿9,243

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 24/6

07:05-10:04

Nonstop5h 59m

Seattle/Tacoma Intl

Tue 30/6

21:50-06:05

Nonstop5h 15m

฿9,243

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Tue 25/8

07:05-10:04

Nonstop5h 59m

Seattle/Tacoma Intl

Sun 30/8

21:50-06:05

Nonstop5h 15m

฿9,243

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 27/8

07:05-10:04

Nonstop5h 59m

Seattle/Tacoma Intl

Mon 31/8

21:50-06:05

Nonstop5h 15m

฿9,243

Flights are sorted by cheapest return flights first.

Deals found on 5/3

Showing 1-10 of 20 resultsSorted by cheapest first
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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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