Plan to arrive at SEA at least two hours before your flight. Use SEA Spot Saver for security screening appointments to save time.

Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $255 (Kiwi.com) |
One-way from | $142 (Cheapflightsfares) |
Popular in | December |
Cheapest in | October |
Average price | $357 |
Good round-trip deal | $317 or less |
Good one-way deal | $168 or less |
Fly from
Fly to
Route
Depart
Return
Price
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 12/5
9:44 am-5:53 pm
Nonstop5h 09m
Philadelphia
Sun 12/7
7:06 am-10:20 am
Nonstop6h 14m
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 12/11
9:35 pm-5:46 am
Nonstop5h 11m
Philadelphia
Sun 12/14
7:06 am-10:20 am
Nonstop6h 14m
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 1/21
9:54 am-6:06 pm
Nonstop5h 12m
Philadelphia
Sun 1/25
7:06 pm-10:29 pm
Nonstop6h 23m
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 12/11
7:11 pm-5:50 am
1 stop7h 39m
Philadelphia
Tue 12/16
7:05 am-2:59 pm
1 stop10h 54m
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Sat 12/6
1:47 pm-11:57 pm
1 stop7h 10m
Philadelphia
Thu 12/11
7:05 am-2:59 pm
1 stop10h 54m
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 12/3
2:03 pm-12:51 am
1 stop7h 48m
Philadelphia
Sun 12/7
5:30 am-12:40 pm
1 stop10h 10m
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 11/20
7:12 pm-5:55 am
1 stop7h 43m
Philadelphia
Sun 11/23
7:10 am-2:59 pm
1 stop10h 49m
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 1/16
9:54 am-6:06 pm
Nonstop5h 12m
Philadelphia
Sun 1/18
7:06 pm-10:29 pm
Nonstop6h 23m
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 12/4
5:40 am-10:35 pm
1 stop13h 55m
Philadelphia
Wed 12/10
6:00 am-4:30 pm
2 stops13h 30m
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Sat 12/6
5:45 am-3:55 pm
1 stop7h 10m
Philadelphia
Sat 12/13
12:15 pm-9:00 pm
2 stops11h 45m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy- | Trust Score*1 star |
The best time to book flights from Seattle to Philadelphia is 59 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, November is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of $128). Flying from Seattle to Philadelphia in January is currently the most expensive (average of $222). 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.
A simple way to save on the total cost of your ticket is to fly from Seattle to Philadelphia at noon. If you’re flexible enough to do this you can expect to save up to 52% on your trip compared to booking a flight in the afternoon.
Travelers seeking maximum savings on their Seattle to Philadelphia flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Comfort
Food
Entertainment
Boarding
Overall
Crew
Reviews
Anonymous,Sep 2025
SEA - MKE
Comfort
Food
Entertainment
Boarding
Overall
Crew
Reviews
Anonymous,Sep 2025
SEA - MKE
Comfort
Food
Entertainment
Boarding
Overall
Crew
Reviews
Anonymous,Sep 2025
SEA - MKE
Comfort
Food
Entertainment
Boarding
Overall
Crew
Reviews
Anonymous,Sep 2025
SEA - MKE
Comfort
Food
Entertainment
Boarding
Overall
Crew
Reviews
Anonymous,Sep 2025
SEA - MKE
Comfort
Food
Entertainment
Boarding
Overall
Crew
Reviews
Anonymous,Sep 2025
SEA - MKE
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$131 | Average$291 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$138 | Average$258 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$206 | Average$390 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$221 | Average$370 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$233 | Average$355 | FlexibilityNo cancel fee | On-time83% | |
| Cheapest$277 | Average$534 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$277 | Average$540 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$277 | Average$416 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$351 | Average$430 | FlexibilityNo cancel fee | On-time63% |