For quick check-in, verify your airline’s terminal before arriving. Terminals are spread out, and only some are linked by indoor walkways.
Round-trip from | $267 (CheapOair) |
---|---|
One-way from | $139 (Southwest) |
Popular in | June |
Cheapest in | March |
Average price | $379 |
Good round-trip deal | $325 or less |
Good one-way deal | $191 or less |
Fly from
Fly to
Route
Depart
Return
Price
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Fri 11/7
7:05 am-2:45 pm
1 stop10h 40m
Seattle/Tacoma Intl
Sat 11/15
11:00 pm-9:25 am
1 stop7h 25m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Tue 11/25
7:10 am-2:54 pm
1 stop10h 44m
Seattle/Tacoma Intl
Fri 11/28
6:00 am-6:09 pm
1 stop9h 09m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Fri 11/7
7:05 am-2:45 pm
1 stop10h 40m
Seattle/Tacoma Intl
Tue 11/11
11:55 pm-10:51 am
1 stop7h 56m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Tue 10/7
6:00 am-10:33 am
1 stop7h 33m
Seattle/Tacoma Intl
Tue 10/14
6:00 am-5:55 pm
1 stop8h 55m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Fri 11/21
6:47 pm-12:11 am
1 stop8h 24m
Seattle/Tacoma Intl
Sun 11/23
11:55 pm-10:51 am
1 stop7h 56m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Tue 3/3
6:35 pm-9:47 pm
Nonstop6h 12m
Seattle/Tacoma Intl
Wed 3/4
9:15 am-5:31 pm
Nonstop5h 16m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Tue 3/3
6:35 pm-9:47 pm
Nonstop6h 12m
Seattle/Tacoma Intl
Wed 3/4
9:15 am-5:31 pm
Nonstop5h 16m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Sun 11/9
7:02 am-10:13 am
Nonstop6h 11m
Seattle/Tacoma Intl
Mon 11/10
9:30 pm-5:42 am
Nonstop5h 12m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Sun 11/9
7:02 am-10:13 am
Nonstop6h 11m
Seattle/Tacoma Intl
Wed 11/12
9:30 pm-5:42 am
Nonstop5h 12m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Mon 11/3
7:12 pm-10:30 pm
Nonstop6h 18m
Seattle/Tacoma Intl
Fri 11/7
9:30 pm-5:42 am
Nonstop5h 12m
The best time to book flights from Philadelphia to Seattle is 71 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Currently, January is the cheapest month in which you can book a flight from Philadelphia to Seattle (average of $238). Flying from Philadelphia to Seattle in June is currently the most expensive (average of $387). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
One of the essential ways to save on airfare from Philadelphia to Seattle is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 23% on airfare.
Travelers seeking maximum savings on their Philadelphia to Seattle flight should consider departing on Tuesday at noon when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
Food
Comfort
Entertainment
Boarding
Overall
Crew
Reviews
Anonymous,Aug 2025
MFR - SEA
Food
Comfort
Entertainment
Boarding
Overall
Crew
Reviews
Anonymous,Aug 2025
MFR - SEA
Food
Comfort
Entertainment
Boarding
Overall
Crew
Reviews
Anonymous,Aug 2025
MFR - SEA
Food
Comfort
Entertainment
Boarding
Overall
Crew
Reviews
Anonymous,Aug 2025
MFR - SEA
Food
Comfort
Entertainment
Boarding
Overall
Crew
Reviews
Anonymous,Aug 2025
MFR - SEA
Food
Comfort
Entertainment
Boarding
Overall
Crew
Reviews
Anonymous,Aug 2025
MFR - SEA
Airline | Cheapest | Average | Flexibility | On-time |
---|---|---|---|---|
Cheapest$127 | Average$252 | FlexibilityNo cancel fee | On-time65% | |
Cheapest$128 | Average$283 | FlexibilityNo cancel fee | On-time62% | |
Cheapest$237 | Average$386 | FlexibilityNo cancel fee | On-timeN/A | |
Cheapest$238 | Average$360 | FlexibilityNo cancel fee | On-time83% | |
Cheapest$267 | Average$475 | FlexibilityNo cancel fee | On-time85% | |
Cheapest$286 | Average$452 | FlexibilityNo cancel fee | On-time69% | |
Cheapest$287 | Average$497 | FlexibilityNo cancel fee | On-time75% | |
Cheapest$292 | Average$444 | FlexibilityNo cancel fee | On-time71% | |
Cheapest$296 | Average$456 | FlexibilityNo cancel fee | On-time63% |