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: Sat Oct 21 2017 Return: Mon Oct 23 2017 Trip spans 3 days
Frontier
Frontier
PHL
12:00a
SEA
1:41p
13h 41m
1 stop
SEA
12:00a
PHL
9:56a
9h 56m
1 stop
Depart: Tue Oct 31 2017 Return: Tue Nov 7 2017 Trip spans 8 days
Multiple Airlines
Multiple Airlines
PHL
12:00a
SEA
11:00a
11h 00m
1 stop
SEA
12:00a
PHL
5:12a
5h 12m
nonstop
Depart: Wed Oct 11 2017 Return: Wed Oct 18 2017 Trip spans 8 days
Frontier
Frontier
PHL
12:00a
SEA
1:41p
13h 41m
1 stop
SEA
12:00a
PHL
9:56a
9h 56m
1 stop
Depart: Sun Oct 15 2017 Return: Wed Oct 18 2017 Trip spans 4 days
Multiple Airlines
Multiple Airlines
PHL
12:00a
SEA
11:00a
11h 00m
1 stop
SEA
12:00a
PHL
7:04a
7h 04m
1 stop
Depart: Sun Oct 15 2017 Return: Wed Oct 18 2017 Trip spans 4 days
Frontier
Frontier
PHL
12:00a
SEA
11:00a
11h 00m
1 stop
SEA
12:00a
PHL
9:56a
9h 56m
1 stop
Depart: Wed Aug 23 2017 Return: Wed Aug 30 2017 Trip spans 8 days
Multiple Airlines
Multiple Airlines
PHL
12:00a
SEA
5:57a
5h 57m
nonstop
SEA
12:00a
PHL
10:32a
10h 32m
1 stop
Depart: Wed Oct 18 2017 Return: Wed Oct 25 2017 Trip spans 8 days
Frontier
Frontier
PHL
12:00a
SEA
1:41p
13h 41m
1 stop
SEA
12:00a
PHL
9:56a
9h 56m
1 stop
Depart: Tue Sep 12 2017 Return: Sat Sep 30 2017 Trip spans 19 days
Multiple Airlines
Multiple Airlines
PHL
12:00a
SEA
6:00a
6h 00m
nonstop
SEA
12:00a
PHL
10:31a
10h 31m
1 stop
Depart: Sat Oct 21 2017 Return: Wed Oct 25 2017 Trip spans 5 days
Frontier
Frontier
PHL
12:00a
SEA
1:41p
13h 41m
1 stop
SEA
12:00a
PHL
9:56a
9h 56m
1 stop
Depart: Sat Sep 16 2017 Return: Sat Sep 30 2017 Trip spans 15 days
Multiple Airlines
Multiple Airlines
PHL
12:00a
SEA
6:00a
6h 00m
nonstop
SEA
12:00a
PHL
10:31a
10h 31m
1 stop
Depart: Sun Oct 22 2017 Return: Wed Oct 25 2017 Trip spans 4 days
Frontier
Frontier
PHL
12:00a
SEA
11:00a
11h 00m
1 stop
SEA
12:00a
PHL
9:56a
9h 56m
1 stop
Depart: Tue Sep 19 2017 Return: Sat Sep 23 2017 Trip spans 5 days
Multiple Airlines
Multiple Airlines
PHL
12:00a
SEA
6:05a
6h 05m
nonstop
SEA
12:00a
PHL
10:31a
10h 31m
1 stop
Depart: Sat Aug 26 2017 Return: Tue Aug 29 2017 Trip spans 4 days
Frontier
Frontier
PHL
12:00a
SEA
11:01a
11h 01m
1 stop
SEA
12:00a
PHL
11:07a
11h 07m
1 stop
Depart: Tue Sep 26 2017 Return: Sat Sep 30 2017 Trip spans 5 days
Multiple Airlines
Multiple Airlines
PHL
12:00a
SEA
6:05a
6h 05m
nonstop
SEA
12:00a
PHL
10:31a
10h 31m
1 stop
Depart: Tue Aug 29 2017 Return: Wed Aug 30 2017 Trip spans 2 days
Frontier
Frontier
PHL
12:00a
SEA
8:20a
8h 20m
1 stop
SEA
12:00a
PHL
10:32a
10h 32m
1 stop
Depart: Wed Oct 4 2017 Return: Tue Oct 10 2017 Trip spans 7 days
Multiple Airlines
Multiple Airlines
PHL
12:00a
SEA
6:08a
6h 08m
nonstop
SEA
12:00a
PHL
12:40p
12h 40m
1 stop
Depart: Wed Aug 30 2017 Return: Wed Sep 6 2017 Trip spans 8 days
Frontier
Frontier
PHL
12:00a
SEA
11:22p
23h 22m
1 stop
SEA
12:00a
PHL
10:32a
10h 32m
1 stop
Depart: Sat Oct 14 2017 Return: Wed Oct 18 2017 Trip spans 5 days
Multiple Airlines
Multiple Airlines
PHL
12:00a
SEA
6:08a
6h 08m
nonstop
SEA
12:00a
PHL
9:56a
9h 56m
1 stop
Depart: Sat Sep 2 2017 Return: Tue Sep 12 2017 Trip spans 11 days
Frontier
Frontier
PHL
12:00a
SEA
11:01a
11h 01m
1 stop
SEA
12:00a
PHL
11:01a
11h 01m
1 stop
Depart: Wed Oct 18 2017 Return: Wed Oct 25 2017 Trip spans 8 days
Multiple Airlines
Multiple Airlines
PHL
12:00a
SEA
6:08a
6h 08m
nonstop
SEA
12:00a
PHL
9:56a
9h 56m
1 stop
* 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
$308
Destination

Seattle
$308
Airlines