Find Cheap Flights from Philadelphia to Seattle/Tacoma Intl (PHL - SEA)

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Sat 12/16
Sat 12/23
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Good to Know

Low Season:
February
Best time to beat the crowds
2%
expected price decrease
High Season:
July
Most popular time to fly
8%
expected price increase
Average Price:
$434
(avg. price over the last 2 weeks)
Good Deal:
$333
or less (round trip)

When to Book Flights from Philadelphia to Seattle/Tacoma Intl

Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top tips for Finding a Cheap Flight

Looking for a cheap flight? 25% of our users found flights on this route for $333 or less.
The cheapest flight from Philadelphia to Seattle/Tacoma Intl was found 39 days before departure, on average.
Book at least 2 weeks before departure in order to get a below-average price.
High season is considered to be June, July and August. The cheapest month to fly is February.
Morning departure is around 4% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking Philadelphia to Seattle/Tacoma Intl Flights

How long does a flight from Philadelphia to Seattle/Tacoma Intl take?
An average nonstop flight takes 5h 56m, covering a distance of 2372 miles.
How many flights are there between Philadelphia and Seattle/Tacoma Intl?
There are 84 (nonstop) flights between Philadelphia and Seattle/Tacoma Intl per week, averaging 12 per day.
Which airlines provide the cheapest flights from Philadelphia to Seattle/Tacoma Intl?
In the past 3 days, the cheapest round-trip tickets were found on Frontier ($160), Alaska Airlines ($297) and Multiple Airlines ($297).
Do I need a passport to fly between Philadelphia and Seattle/Tacoma Intl?
No.
Which airlines fly most frequently between Philadelphia and Seattle/Tacoma Intl?
American Airlines (4 times daily), Alaska Airlines (4 times daily), British Airways (4 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly Philadelphia to Seattle/Tacoma Intl?
For Philadelphia to Seattle/Tacoma Intl, Tuesday is the cheapest day to fly on average and Monday is the most expensive. Flying from Seattle/Tacoma Intl back to Philadelphia, the best deals are generally found on Wednesday, with Sunday being the most expensive.

Book cheap flights from Philadelphia to Seattle/Tacoma Intl (round-trip)

Airports
Origin
Philadelphia
$160
only
$160
Destination
Seattle
$160
only
$160
Tue, Jan 16
PHL
SEA
11h 26m
Wed, Jan 24
SEA
PHL
8h 28m
Trip: 9 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33270 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SFO
Mediocre 2.0

Website would not let me check in the day before or the morning or my flight. There was an error every time and I almost got to the end once. I could not change the time of my transportation and arrived 10 minutes past the check in deadline (an hour prior to the flight taking off). I was refused access to the flight and offered a flight 5 hours later. The staff was rude and not helpful. I had heard negative things about Frontier and now I know why.

DEN
MKE
Good 6.6

Direct flight from Denver to Milwaukee. Didn't have to wait on tarmac so that was a plus.

Have to pay for every little thring down to the peanuts

MSY
MCO
Excellent 10.0

Great crew great flight

Nothing, everything was awesome. Crazy to believe this was a 19 dollar flight

SJU
ATL
Excellent 10.0

Fast luggage checking

No cash accepted for overweight baggage

AUS
LAS
Excellent 8.0

Efficient

N/a

Thu, Jan 25
PHL
SEA
6h 15m
Sun, Jan 28
SEA
PHL
5h 17m
Trip: 4 days
8.2ExcellentShow reviews
Overall 8.2 Excellent
Based on 20 reviews
Overall
8.6
Boarding
8.7
Comfort
8.4
Crew
8.9
Entertainment
7.9
Food
8.0
PHL
SEA
Excellent 10.0

How quickly we arrived!

Very noisy!

SAN
SEA
Excellent 8.0

I like the internet for text being free, and staff is nice.

Food is not free.

PHL
SEA
Okay 4.0

The part where I got off the plane.

Late by an hour taking of, sat next to heavy people both side. walk way side you would think is no issue but the guy was so heavy that you was in the walk way. I received far to many crotch and butt rubs on my shoulder and a couple times to my face from people squeezing by. My seat should be my seat, it’s what I paid for. The continuous invasion of my already very small personal space just makes flying so unopealing.

PHL
SEA
Excellent 10.0

Check-in, Seats, service, staff were great. And arrived 45 minutes ahead of schedule.

PHL
SEA
Excellent 9.3

Flight attendants were very pleasant - much more pleasant than those on a different flight I had with a different airline. I really appreciated that:)

Thu, Feb 1
PHL
SEA
6h 15m
Mon, Feb 5
SEA
PHL
5h 20m
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Wed, Mar 28
PHL
SEA
7h 46m
Tue, Apr 3
SEA
PHL
7h 02m
Trip: 7 days
6.4GoodShow reviews
Overall 6.4 Good
Based on 41 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
PHL
SEA
Mediocre 3.0

It was not a full flight, so I was given an aisle instead of a middle seat...for which I was grateful.

Flight was 6 hours...almost as much as my previous international flight, yet food and drink was only available for purchase. No entertainment options. Plus, wireless was $21! I needed to work and had to purchase, but that is really quite a rip off compared to other airlines.

PHL
SEA
Excellent 9.0

Everything was great, but they didn't serve ANY complementary food on a 5 hour flight. What happened to lunch?

PHL
SEA
Mediocre 3.0

Nothing!

it was not BA flight American Airlines. For a 6-hour cross-country flight, there was no entertainment of any kind. More than that, no blanket or a pillow was available which made the trip so much worse. Worst of all, the last 90 minutes of the flight all the toilets ran out of water so they can't even be flushed. First time I have ever come across such a problem. Absolutely terrible.

PHL
SEA
Mediocre 2.0

Delayed

PHL
SEA
Okay 5.0

The worst flight attendant I have ever seen.

Mon, Mar 26
PHL
SEA
9h 26m
Sun, Apr 1
SEA
PHL
10h 59m
Trip: 7 days
7.0GoodShow reviews
Overall 7.0 Good
Based on 52353 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
MIA
ORD
Excellent 9.0

That it got me to Paris safe

No outlets to charge your phone, and the tv played the same movie over and over. The meals were also cheap. Didn't like any of them. Should have flown southwest or delta.

RSW
EWR
Okay 5.3

Waiting

IAD
MUC
Good 6.3

Crew and food.

The old bait and switch. United is not and will never be Lufthansa. Cattle call seating.

EWR
BTV
Excellent 10.0

All the effort to make my need for wheelchair problem free

RSW
EWR
Okay 5.3

Boarding quickly

No PED was available didn’t have anything for entertainment if you weren’t buying it seems every thing available for 3 hour flight and flight was scheduled for 2 hours and 55 minutes No snacks made available came thru once had a small bag of pretzels cup of coffee and never came back

Tue, Apr 10
PHL
SEA
8h 27m
Mon, Apr 16
SEA
PHL
8h 06m
Trip: 7 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33270 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MKE
TPA
Good 6.6

2nd row had plenty of leg room, nice new jet, Nice flight attendants, smooth flight, on time, made it to my destination safe. Successful flight! TSA Pre-chek was nice.

Idiot in front of me reclined his seat. Plane didn't get catered overnight. Water only.

PHL
MCO
Mediocre 2.3

Its a scam! They act like they are giving you a break by having you buy cheap flights but in reality it costs more than a bit more expensive flight. I had to pay $45.00 each bag no matter if it was checked or carry-on. In total round trip I paid $180.00 extra just for my husbands carry-on as well as mine. Must add that our flights together cost 286.00. We should of went with American Airlines. On top of that we couldn't select our own seat if so, we had to pay extra, so we had to sit separated from each other. It was ridiculous! Never Again with this company!!!!!

DEN
MKE
Good 6.6

Direct flight from Denver to Milwaukee. Didn't have to wait on tarmac so that was a plus.

Have to pay for every little thring down to the peanuts

TYS
MCO
Okay 5.0

Great people

The plane wasn’t very clean

IAD
LAS
Good 6.3

They gave me and someone else the same seat luckily it wasn’t a packed flight and was able to move to a row that was empty

Wed, Apr 11
PHL
SEA
19h 37m
Tue, Apr 17
SEA
PHL
18h 33m
Trip: 7 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33270 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MKE
TPA
Good 6.6

2nd row had plenty of leg room, nice new jet, Nice flight attendants, smooth flight, on time, made it to my destination safe. Successful flight! TSA Pre-chek was nice.

Idiot in front of me reclined his seat. Plane didn't get catered overnight. Water only.

DEN
SFO
Mediocre 2.0

Website would not let me check in the day before or the morning or my flight. There was an error every time and I almost got to the end once. I could not change the time of my transportation and arrived 10 minutes past the check in deadline (an hour prior to the flight taking off). I was refused access to the flight and offered a flight 5 hours later. The staff was rude and not helpful. I had heard negative things about Frontier and now I know why.

IAD
LAS
Good 6.3

They gave me and someone else the same seat luckily it wasn’t a packed flight and was able to move to a row that was empty

MSY
PVD
Excellent 8.0

The price!

DEN
MKE
Good 6.6

Direct flight from Denver to Milwaukee. Didn't have to wait on tarmac so that was a plus.

Have to pay for every little thring down to the peanuts

Tue, Mar 27
PHL
SEA
8h 21m
Wed, Apr 4
SEA
PHL
10h 02m
Trip: 9 days
Overall 0.0 Poor
Based on 0 reviews
Tue, May 15
PHL
SEA
8h 22m
Mon, May 21
SEA
PHL
16h 45m
Trip: 7 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33270 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
PHL
MCO
Mediocre 2.3

Its a scam! They act like they are giving you a break by having you buy cheap flights but in reality it costs more than a bit more expensive flight. I had to pay $45.00 each bag no matter if it was checked or carry-on. In total round trip I paid $180.00 extra just for my husbands carry-on as well as mine. Must add that our flights together cost 286.00. We should of went with American Airlines. On top of that we couldn't select our own seat if so, we had to pay extra, so we had to sit separated from each other. It was ridiculous! Never Again with this company!!!!!

LAS
IAD
Good 6.3

The staff on the flight was awesome, very helpful and kind to my friend who is terrified to fly. We were even ahead of schedule.

To pay for a carry on item is just crazy to me... not to mention you have to pay for beverages and snacks. All you are given is water.

ATL
DEN
Mediocre 3.6

The price was good, and it was a non stop flight.

The crew was rude and the seats didn't recline.

TYS
MCO
Okay 5.0

Great people

The plane wasn’t very clean

DEN
MKE
Good 6.6

Direct flight from Denver to Milwaukee. Didn't have to wait on tarmac so that was a plus.

Have to pay for every little thring down to the peanuts

Wed, May 9
PHL
SEA
13h 39m
Sun, May 13
SEA
PHL
9h 31m
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Mon, Dec 25
PHL
SEA
9h 28m
Sun, Dec 31
SEA
PHL
9h 39m
Trip: 7 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 14257 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
BWI
JFK
Mediocre 3.6

There was a change in our flight. According to Delta you didn't confirm every leg of our flight and the plane was over booked.

DEN
ATL
Excellent 8.6

On two of the legs of the trip they notice I was a tall person with long legs and upgraded me to seats with more leg room!! I didn't even ask. Thank you.

On the way back there were open seats with extra leg room and I asked the gate attendant if it was possible to switch my seat to one with more room and they said they only could if I paid extra.

LGA
ORD
Excellent 10.0

Flight was on time. Boarded quickly with no fuss.

JFK
ATL
Excellent 8.3

We had the best flight attendant ever! Her name was Sharon on Eandeavor / Delta Cnx, and she made the experience the best flight I've experienced. Thanks Sharon for being awesome!

window seat in back didn't have window

ATL
DFW
Excellent 10.0

My entire flight experience was delightful. Was dry impressed with the staff both at Hartsfield-Jackson and DFW...and our flight crew was positively sublime.

Wed, Jun 13
PHL
SEA
13h 39m
Tue, Jun 19
SEA
PHL
8h 07m
Trip: 7 days
Overall 0.0 Poor
Based on 0 reviews
Sat, Jun 16
PHL
SEA
11h 25m
Tue, Jun 19
SEA
PHL
8h 07m
Trip: 4 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Jun 26
PHL
SEA
8h 22m
Mon, Jul 2
SEA
PHL
20h 06m
Trip: 7 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33270 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
MKE
TPA
Good 6.6

2nd row had plenty of leg room, nice new jet, Nice flight attendants, smooth flight, on time, made it to my destination safe. Successful flight! TSA Pre-chek was nice.

Idiot in front of me reclined his seat. Plane didn't get catered overnight. Water only.

MSY
PVD
Excellent 8.0

The price!

AUS
LAS
Excellent 8.0

Efficient

N/a

SJU
ATL
Excellent 10.0

Fast luggage checking

No cash accepted for overweight baggage

LAS
IAD
Good 6.3

The staff on the flight was awesome, very helpful and kind to my friend who is terrified to fly. We were even ahead of schedule.

To pay for a carry on item is just crazy to me... not to mention you have to pay for beverages and snacks. All you are given is water.

Sat, Jun 30
PHL
SEA
5h 56m
Sat, Jul 7
SEA
PHL
7h 02m
Trip: 8 days
6.4GoodShow reviews
Overall 6.4 Good
Based on 41 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
PHL
SEA
Okay 5.0

The worst flight attendant I have ever seen.

PHL
SEA
Mediocre 3.0

It was not a full flight, so I was given an aisle instead of a middle seat...for which I was grateful.

Flight was 6 hours...almost as much as my previous international flight, yet food and drink was only available for purchase. No entertainment options. Plus, wireless was $21! I needed to work and had to purchase, but that is really quite a rip off compared to other airlines.

PHL
SEA
Excellent 9.0

Everything was great, but they didn't serve ANY complementary food on a 5 hour flight. What happened to lunch?

PHL
SEA
Excellent 8.6

Helpful crew

Would have liked to be able to power up digital devices

PHL
SEA
Okay 5.0

Left s half hour late because they had to shift cargo, then we taxied on the runway for what seemed like a half hour. My wife and I purchased our tickets in July but could never pick our seats and ended up 9 rows apart.

Sat, Dec 23
PHL
SEA
6h 08m
Tue, Dec 26
SEA
PHL
5h 02m
Trip: 4 days
6.4GoodShow reviews
Overall 6.4 Good
Based on 41 reviews
Overall
7.3
Boarding
7.5
Comfort
7.1
Crew
7.8
Entertainment
6.7
Food
6.6
PHL
SEA
Excellent 10.0

no charging station

PHL
SEA
Mediocre 3.0

It was not a full flight, so I was given an aisle instead of a middle seat...for which I was grateful.

Flight was 6 hours...almost as much as my previous international flight, yet food and drink was only available for purchase. No entertainment options. Plus, wireless was $21! I needed to work and had to purchase, but that is really quite a rip off compared to other airlines.

PHL
SEA
Excellent 9.0

Everything was great, but they didn't serve ANY complementary food on a 5 hour flight. What happened to lunch?

PHL
SEA
Excellent 8.6

Helpful crew

Would have liked to be able to power up digital devices

PHL
SEA
Okay 5.0

The worst flight attendant I have ever seen.

Sat, Jun 30
PHL
SEA
13h 39m
Fri, Jul 6
SEA
PHL
11h 20m
Trip: 7 days
5.6OkayShow reviews
Overall 5.6 Okay
Based on 33270 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SJU
ATL
Excellent 10.0

Fast luggage checking

No cash accepted for overweight baggage

AUS
LAS
Excellent 8.0

Efficient

N/a

PHL
MCO
Mediocre 2.3

Its a scam! They act like they are giving you a break by having you buy cheap flights but in reality it costs more than a bit more expensive flight. I had to pay $45.00 each bag no matter if it was checked or carry-on. In total round trip I paid $180.00 extra just for my husbands carry-on as well as mine. Must add that our flights together cost 286.00. We should of went with American Airlines. On top of that we couldn't select our own seat if so, we had to pay extra, so we had to sit separated from each other. It was ridiculous! Never Again with this company!!!!!

MSY
MCO
Excellent 10.0

Great crew great flight

Nothing, everything was awesome. Crazy to believe this was a 19 dollar flight

TYS
MCO
Okay 5.0

Great people

The plane wasn’t very clean

Sun, Dec 24
PHL
SEA
19h 33m
Thu, Dec 28
SEA
PHL
5h 02m
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
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The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.