Find Cheap Flights from Philadelphia to Seattle

Depart
Return
1 adult
Adults
18-64
Seniors
65+
Youths
12-17
Children
2-11
Seat Infants
under 2
Lap Infants
under 2
The price shown for each flight will be the average for all passengers including any infants.
Compare vs. KAYAK all | none
Browse Origins:
Browse Destinations:

Dates flexible? Here are the best fares found in the past 48 hours...

Book cheap flights from Philadelphia to Seattle

(Round-trip)
Depart: Tue May 2 2017 Return: Sun May 7 2017 Trip spans 6 days
Frontier
Frontier
PHL
5:50p
SEA
9:15a
15h 25m
1 stop
SEA
7:00a
PHL
10:41p
15h 41m
1 stop
Depart: Tue May 23 2017 Return: Wed Jun 14 2017 Trip spans 23 days
Spirit Airlines
Spirit Airlines
PHL
8:40a
SEA
8:14p
11h 34m
2 stops
SEA
11:23a
PHL
11:55p
12h 32m
1 stop
Depart: Fri Oct 6 2017 Return: Tue Oct 10 2017 Trip spans 5 days
Major Airline
Major Airline
PHL
12:15a
SEA
11:45a
11h 30m
1 stop
SEA
9:35a
PHL
7:59p
10h 24m
1 stop
Depart: Wed May 10 2017 Return: Mon May 15 2017 Trip spans 6 days
American Airlines
American Airlines
PHL
4:55p
SEA
10:58p
6h 03m
nonstop
SEA
11:55a
PHL
11:02p
11h 07m
1 stop
Depart: Thu Sep 7 2017 Return: Tue Sep 12 2017 Trip spans 6 days
Alaska Airlines
Alaska Airlines
PHL
1:15p
SEA
7:14p
5h 59m
nonstop
SEA
3:55a
PHL
8:59a
5h 04m
nonstop
Depart: Sun May 21 2017 Return: Mon May 22 2017 Trip spans 2 days
United
United
PHL
3:50a
SEA
1:17p
9h 27m
1 stop
SEA
8:10p
PHL
5:12a
9h 02m
1 stop
Depart: Wed May 3 2017 Return: Fri May 5 2017 Trip spans 3 days
Frontier
Frontier
PHL
6:30p
SEA
9:15a
14h 45m
1 stop
SEA
2:45p
PHL
10:41p
7h 56m
1 stop
Depart: Mon Oct 16 2017 Return: Tue Oct 24 2017 Trip spans 9 days
Major Airline
Major Airline
PHL
10:05p
SEA
7:34a
9h 29m
1 stop
SEA
9:35a
PHL
7:59p
10h 24m
1 stop
Depart: Tue Jun 13 2017 Return: Wed Jun 14 2017 Trip spans 2 days
Spirit Airlines
Spirit Airlines
PHL
2:00a
SEA
1:30p
35h 30m
2 stops
SEA
11:23a
PHL
11:55p
12h 32m
1 stop
Depart: Sat May 13 2017 Return: Mon May 22 2017 Trip spans 10 days
Frontier
Frontier
PHL
6:20p
SEA
9:15a
14h 55m
1 stop
SEA
2:24p
PHL
10:41p
8h 17m
1 stop
Depart: Tue Aug 22 2017 Return: Tue Aug 29 2017 Trip spans 8 days
Frontier
Frontier
PHL
6:50p
SEA
9:07a
14h 17m
1 stop
SEA
6:55a
PHL
5:32p
10h 37m
1 stop
Depart: Thu Sep 28 2017 Return: Tue Oct 3 2017 Trip spans 6 days
Major Airline
Major Airline
PHL
2:40p
SEA
5:02a
14h 22m
1 stop
SEA
9:59a
PHL
7:59p
10h 00m
1 stop
Depart: Tue Sep 5 2017 Return: Tue Sep 12 2017 Trip spans 8 days
Frontier
Frontier
PHL
6:50p
SEA
9:07a
14h 17m
1 stop
SEA
6:55a
PHL
5:26p
10h 31m
1 stop
Depart: Tue Sep 19 2017 Return: Sat Sep 30 2017 Trip spans 12 days
Alaska Airlines
Alaska Airlines
PHL
1:15p
SEA
7:14p
5h 59m
nonstop
SEA
3:55a
PHL
8:59a
5h 04m
nonstop
Depart: Tue May 16 2017 Return: Sat May 20 2017 Trip spans 5 days
American Airlines
American Airlines
PHL
4:55p
SEA
10:58p
6h 03m
nonstop
SEA
6:30p
PHL
11:40p
5h 10m
nonstop
Depart: Mon May 1 2017 Return: Wed May 3 2017 Trip spans 3 days
Spirit Airlines
Spirit Airlines
PHL
3:40p
SEA
11:13p
31h 33m
1 stop
SEA
11:23a
PHL
11:54p
12h 31m
1 stop
Depart: Sat May 6 2017 Return: Sun May 7 2017 Trip spans 2 days
Major Airline
Major Airline
PHL
2:55a
SEA
1:10p
10h 15m
1 stop
SEA
10:45a
PHL
6:41p
7h 56m
1 stop
Depart: Sat Sep 9 2017 Return: Sat Sep 16 2017 Trip spans 8 days
Frontier
Frontier
PHL
11:20a
SEA
8:37p
9h 17m
1 stop
SEA
6:55a
PHL
5:26p
10h 31m
1 stop
Depart: Sat Jun 3 2017 Return: Sun Jun 4 2017 Trip spans 2 days
United
United
PHL
8:35a
SEA
7:42p
11h 07m
1 stop
SEA
1:45a
PHL
1:22p
11h 37m
1 stop
Depart: Fri Sep 22 2017 Return: Sat Sep 30 2017 Trip spans 9 days
Alaska Airlines
Alaska Airlines
PHL
1:15p
SEA
7:14p
5h 59m
nonstop
SEA
3:55a
PHL
8:59a
5h 04m
nonstop
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

We compile tonnes of data for you
Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
please send us an email and someone from our team will get back to you promptly.

Airports
Origin

Philadelphia
$270
Destination

Seattle
$270
Airlines Airline reviews

36 travelers who booked a flight from Philadelphia to Seattle rated their chosen airlines with an average of 7.1.

Overall
7.5
Boarding
8.0
Crew
8.3
Comfort
7.5
Food
6.3
Entertainment
6.4