
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $276 (CheapOair) |
One-way from | $82 (Kiwi.com) |
Popular in | June |
Cheapest in | October |
Average price | $357 |
Good round-trip deal | $341 or less |
Good one-way deal | $200 or less |
Fly from
Fly to
Route
Depart
Return
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Do 5/14
7:10 am-10:00 am
Nonstop5h 50m
Seattle/Tacoma Intl
Sa 5/16
9:20 pm-5:37 am
Nonstop5h 17m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Mo 6/1
7:10 am-10:00 am
Nonstop5h 50m
Seattle/Tacoma Intl
So 6/7
5:45 pm-5:43 am
1 stop8h 58m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
So 8/16
6:40 pm-12:01 am
1 stop8h 21m
Seattle/Tacoma Intl
So 8/23
9:50 pm-6:05 am
Nonstop5h 15m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Mi 5/20
7:10 am-10:00 am
Nonstop5h 50m
Seattle/Tacoma Intl
Mi 5/27
11:05 pm-8:55 am
1 stop6h 50m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Fr 8/21
6:40 pm-12:01 am
1 stop8h 21m
Seattle/Tacoma Intl
Fr 8/28
9:50 pm-6:05 am
Nonstop5h 15m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Mi 7/15
6:20 pm-12:06 am
1 stop8h 46m
Seattle/Tacoma Intl
Di 7/21
9:50 pm-6:05 am
Nonstop5h 15m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
So 8/16
6:40 pm-12:01 am
1 stop8h 21m
Seattle/Tacoma Intl
Di 8/25
9:50 pm-6:05 am
Nonstop5h 15m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Di 7/14
4:35 pm-12:40 am
2 stops11h 05m
Seattle/Tacoma Intl
Di 7/21
11:05 pm-12:10 pm
1 stop10h 05m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Sa 8/15
8:55 am-5:00 pm
1 stop11h 05m
Seattle/Tacoma Intl
Mo 8/24
5:15 am-5:55 pm
1 stop9h 40m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
Sa 8/22
7:05 am-10:04 am
Nonstop5h 59m
Seattle/Tacoma Intl
So 8/23
9:50 pm-6:05 am
Nonstop5h 15m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
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, October is the cheapest month in which you can book a flight from Philadelphia to Seattle (average of $148). Flying from Philadelphia to Seattle in April is currently the most expensive (average of $219). 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.
When flying from Philadelphia to Seattle, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
About 19% of weekly flights between Philadelphia and Seattle have experienced delays in the past year, with the average delay time being 152 minutes.
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
Tuesday tends to have the lowest number of delays on this route, whereas Friday has historically faced a higher average of delays compared to other days of the week.
Over the last year, American Airlines have had the lowest number of delays on this route, with just 16% of flights being delayed.
Chicago (ORD) – chosen by Cheapflights users on 33% of 1-stop itineraries from Philadelphia to Seattle on Cheapflights.
Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $163.
Flights via Chicago (ORD) have the shortest average one-way travel time for 1-stop routes: 8h 04m.
Flights via Chicago (ORD) offer the fastest connection on this route, with an average layover time of 1h 05m.
Overall
Boarding
Comfort
Entertainment
Crew
Food
Reviews
Anonymous,Dec 2025
SJC - SEA
Overall
Boarding
Comfort
Entertainment
Crew
Food
Reviews
Anonymous,Dec 2025
SJC - SEA
Overall
Boarding
Comfort
Entertainment
Crew
Food
Reviews
Anonymous,Dec 2025
SJC - SEA
Overall
Boarding
Comfort
Entertainment
Crew
Food
Reviews
Anonymous,Dec 2025
SJC - SEA
Overall
Boarding
Comfort
Entertainment
Crew
Food
Reviews
Anonymous,Dec 2025
SJC - SEA
Overall
Boarding
Comfort
Entertainment
Crew
Food
Reviews
Anonymous,Dec 2025
SJC - SEA
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$115 | Average$237 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$130 | Average$291 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$183 | Average$371 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$188 | Average$461 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$224 | Average$446 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$250 | Average$461 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$258 | Average$419 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$276 | Average$422 | FlexibilityNo cancel fee | On-time71% |