
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $290 (CheapOair) |
One-way from | $159 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $414 |
Good round-trip deal | $376 or less |
Good one-way deal | $221 or less |
Fly from
Fly to
Route
Depart
Return
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
vie. 6/19
6:45 pm-9:59 pm
Nonstop6h 14m
Seattle/Tacoma Intl
lun. 6/22
9:25 am-5:35 pm
Nonstop5h 10m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
vie. 6/5
6:45 pm-9:35 pm
Nonstop5h 50m
Seattle/Tacoma Intl
dom. 6/14
9:25 am-5:35 pm
Nonstop5h 10m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
dom. 5/24
6:12 am-11:05 am
1 stop7h 53m
Seattle/Tacoma Intl
lun. 6/1
9:20 pm-5:35 am
Nonstop5h 15m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
mié. 7/1
6:45 pm-9:59 pm
Nonstop6h 14m
Seattle/Tacoma Intl
jue. 7/9
6:00 am-6:12 pm
1 stop9h 12m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
mié. 5/27
6:00 am-12:34 pm
1 stop9h 34m
Seattle/Tacoma Intl
mar. 6/2
10:40 pm-9:39 am
1 stop7h 59m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
jue. 5/28
6:45 pm-12:12 am
1 stop8h 27m
Seattle/Tacoma Intl
lun. 6/1
11:59 pm-10:30 am
1 stop7h 31m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
mié. 7/8
7:05 am-10:01 am
Nonstop5h 56m
Seattle/Tacoma Intl
mar. 7/21
9:20 pm-5:29 am
Nonstop5h 09m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
vie. 7/24
7:05 am-10:01 am
Nonstop5h 56m
Seattle/Tacoma Intl
lun. 8/3
9:30 pm-5:53 am
Nonstop5h 23m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
mié. 5/27
7:16 pm-10:28 pm
Nonstop6h 12m
Seattle/Tacoma Intl
mar. 6/2
9:59 am-6:16 pm
Nonstop5h 17m
PhiladelphiaSeattle
PHL - SEA
PHLSEA
Philadelphia
lun. 7/27
6:55 pm-12:25 am
1 stop8h 30m
Seattle/Tacoma Intl
mié. 8/5
11:05 pm-1:15 pm
2 stops11h 10m
| 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 Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
The best time to book flights from Philadelphia to Seattle is 70 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 $318). Flying from Philadelphia to Seattle in June is currently the most expensive (average of $476). 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 20% of weekly flights between Philadelphia and Seattle have experienced delays in the past year, with the average delay time being 148 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 17% of flights being delayed.
Denver (DEN) – chosen by Cheapflights users on 67% 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 $208.
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.
Entertainment
Boarding
Comfort
Crew
Overall
Food
Reviews
Eugene,Mar 2026
MFR - SEA
Entertainment
Boarding
Comfort
Crew
Overall
Food
Reviews
Eugene,Mar 2026
MFR - SEA
Entertainment
Boarding
Comfort
Crew
Overall
Food
Reviews
Eugene,Mar 2026
MFR - SEA
Entertainment
Boarding
Comfort
Crew
Overall
Food
Reviews
Eugene,Mar 2026
MFR - SEA
Entertainment
Boarding
Comfort
Crew
Overall
Food
Reviews
Eugene,Mar 2026
MFR - SEA
Entertainment
Boarding
Comfort
Crew
Overall
Food
Reviews
Eugene,Mar 2026
MFR - SEA
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$130 | Average$290 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$188 | Average$458 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$203 | Average$407 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$213 | Average$374 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$244 | Average$442 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$258 | Average$418 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$275 | Average$425 | FlexibilityNo cancel fee | On-time71% |