Cheap flights from Seattle to Philadelphia from $204
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Philadelphia departing on 12/17. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Fly from
Fly to
Route
Depart
Return
SeattlePhiladelphia
SEA Seattle/Tacoma Intl - PHL Philadelphia
SEAPHL
Seattle/Tacoma Intl
Tue 11/3
7:48 pm-6:19 pm
2 stops19h 31m
Philadelphia
Thu 11/12
8:30 am-9:45 am
2 stops28h 15m
SeattlePhiladelphia
SEA Seattle/Tacoma Intl - PHL Philadelphia
SEAPHL
Seattle/Tacoma Intl
Mon 10/26
12:10 am-10:40 am
1 stop7h 30m
Philadelphia
Sat 10/31
8:15 am-6:15 pm
2 stops13h 00m
SeattlePhiladelphia
SEA Seattle/Tacoma Intl - PHL Philadelphia
SEAPHL
Seattle/Tacoma Intl
Fri 11/6
4:27 pm-2:13 pm
2 stops18h 46m
Philadelphia
Thu 11/12
12:10 pm-3:12 pm
2 stops30h 02m
SeattlePhiladelphia
SEA Seattle/Tacoma Intl - PHL Philadelphia
SEAPHL
Seattle/Tacoma Intl
Sun 11/1
12:15 am-11:00 am
1 stop7h 45m
Philadelphia
Wed 11/4
2:45 pm-10:50 pm
2 stops11h 05m
SeattlePhiladelphia
SEA Seattle/Tacoma Intl - PHL Philadelphia
SEAPHL
Seattle/Tacoma Intl
Fri 11/6
10:40 am-10:49 pm
1 stop9h 09m
Philadelphia
Fri 11/13
4:59 pm-11:20 pm
1 stop9h 21m
SeattlePhiladelphia
SEA Seattle/Tacoma Intl - PHL Philadelphia
SEAPHL
Seattle/Tacoma Intl
Sun 11/22
9:38 pm-5:43 am
Nonstop5h 05m
Philadelphia
Sat 12/5
1:40 pm-11:55 pm
1 stop13h 15m
SeattlePhiladelphia
SEA Seattle/Tacoma Intl - PHL Philadelphia
SEAPHL
Seattle/Tacoma Intl
Sat 11/21
9:38 pm-5:43 am
Nonstop5h 05m
Philadelphia
Sat 12/5
11:13 am-11:55 pm
1 stop15h 42m
SeattlePhiladelphia
SEA Seattle/Tacoma Intl - PHL Philadelphia
SEAPHL
Seattle/Tacoma Intl
Thu 11/5
9:15 am-5:22 pm
Nonstop5h 07m
Philadelphia
Mon 11/9
8:10 am-11:34 am
Nonstop6h 24m
SeattlePhiladelphia
SEA Seattle/Tacoma Intl - PHL Philadelphia
SEAPHL
Seattle/Tacoma Intl
Fri 1/22
12:20 pm-8:25 pm
Nonstop5h 05m
Philadelphia
Sun 1/24
8:27 am-11:52 am
Nonstop6h 25m
SeattlePhiladelphia
SEA Seattle/Tacoma Intl - PHL Philadelphia
SEAPHL
Seattle/Tacoma Intl
Sun 2/21
7:32 pm-7:45 am
1 stop9h 13m
Philadelphia
Thu 2/25
9:30 am-4:09 pm
1 stop9h 39m
See travel insights to Philadelphia from
How to get the cheapest flight ticket from Seattle to Philadelphia
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the typical price of a round-trip flight between Seattle and Philadelphia?
Prices are currently typical for flights on this route.
Typical prices usually range from $343 to $475.The lowest price recently found on this route was $360.
What is the cheapest month to fly to Philadelphia?
The cheapest month to fly to Philadelphia from Seattle is in January. Flight prices, which tend to average around $344, are often lower during this time because this is during the off-season. The month of February is another great option to travel to Philadelphia, with average flight prices from Seattle averaging around $353.
What is the cheapest day to depart on your flight to Philadelphia?
The cheapest day to depart from Seattle to Philadelphia is on a Tuesday. Travelers who choose to depart for Philadelphia on a Tuesday will often find tickets for as low as $425. On the other hand, Sunday is the most expensive day to depart from Seattle because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $563.
What is the cheapest time of day to depart on your flight to Philadelphia?
According to our data, the cheapest time of day to fly to Philadelphia is in the evening. momondo users have found flights departing from Seattle to Philadelphia in the evening for as low as $472. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In contrast, the most expensive time of day to depart to Philadelphia is in the afternoon when prices are around $726.
What is the cheapest Seattle/Tacoma Intl to Philadelphia flight route?
Fly from Seattle/Tacoma Intl to Philadelphia for the best Seattle/Tacoma Intl - Philadelphia flight prices
How far in advance should I book a flight from Seattle to Philadelphia?
You are more likely to see cheaper flights to Philadelphia from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Philadelphia for around $429 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Philadelphia from Seattle for as low as $390 on momondo.
What cabin class options are available on Seattle to Philadelphia flights?
There are 4 cabin classes available to choose from on Seattle to Philadelphia flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
Can stopping save me money on Seattle to Philadelphia flights?
No. A direct flight is the cheapest option for a flight between Seattle to Philadelphia.
How have Seattle to Philadelphia flight prices changed over time?
As of October 2026, prices for Seattle to Philadelphia flights are approximately 22% more expensive when compared to flights at the same time last year.
What is the cheapest airline that flies from Seattle/Tacoma Intl to Philadelphia?
Southwest, United Airlines, and Alaska Airlines are the most popular carriers operating from Seattle/Tacoma Intl to Philadelphia
What airlines fly to Philadelphia?
Alaska Airlines, American Airlines and United Airlines are the top three most popular airlines that fly to Philadelphia from Seattle according to our data. Alaska Airlines is the first choice among our users, with 52% of people opting to fly with this airline when traveling to Philadelphia. Keep in mind that there are 8 different airlines that fly to Philadelphia on a routine basis, so you have a few additional options to choose from.
Which airport is the most popular layover for flights between Seattle and Philadelphia?
Chicago (ORD) was the most common stop: 33% of momondo users choosing 1-stop flights on this route connected there.
Which layover airport offers the lowest fares from Seattle to Philadelphia?
Flights via Detroit (DTW) offer the lowest average round-trip price of $256.
Which layover airport has the shortest travel time from Seattle to Philadelphia?
Flights connecting via Salt Lake City (SLC) have the shortest average one-way travel time: 7h 06m.
Which layover airport has the shortest connection time from Seattle to Philadelphia?
Salt Lake City (SLC) has the shortest average layover time for this route: 0h 55m.
How many flights depart from Seattle to Philadelphia on average per day?
As of October 2026, 7 flights take off from Seattle and land in Philadelphia each day. The most common flight departure time for this route is 9:00PM, with 64% of daily flights taking off in the evening.
How many flights depart from Seattle to Philadelphia on average per week?
55 flights are operational weekly from Seattle to Philadelphia as of October 2026. The most popular departure day for this route is Thu, with 24% of flights per week taking off on this day.
When to book flights from Seattle to Philadelphia
Cheap Seattle to Philadelphia (SEA to PHL) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Seattle to Philadelphia
Frequently asked questions about flying from Seattle to Philadelphia
How far is Seattle/Tacoma Intl to Philadelphia by plane?
The distance between Seattle/Tacoma Intl and Philadelphia is about 2372.3 mi. Typically, this will take 5h 02m by plane in normal conditions.
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Philadelphia Airport?
Prices for flights from Seattle/Tacoma Intl Airport to Philadelphia Airport were last updated today.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Philadelphia Airport?
The number of operators available for flights from Seattle/Tacoma Intl Airport to Philadelphia Airport is 5 as of October 2026.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Philadelphia Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Philadelphia Airport.
What documentation or ID do you need to fly to Philadelphia Airport?
The travel and health documents you'll need for your trip to Philadelphia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Philadelphia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Seattle to Philadelphia?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Seattle to Philadelphia is Airbus A321neo (41.13% of total bookings). The next most popular plane models are Airbus A321-100/200 (35.88%), Boeing 737-800 Passenger/BBJ2 (winglets) (6.80%), and Boeing 737 MAX 8 (4.95%).
What is the most popular airline from Seattle to Philadelphia?
momondo data reveals that the most frequently booked airline on the route from Seattle to Philadelphia is American Airlines, representing 52% of all bookings. The subsequent popular airlines are Alaska Airlines at 35%, Delta at 9%, and United Airlines at 3%.
Best airlines flying from Seattle to Philadelphia
Compare and see reviews for airlines that fly from Seattle to Philadelphia with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $167 | Free Cancellation | Rating 5.6 2,550 reviews | |||
| PriceFrom $248 | Free Cancellation | Rating 7.8 8,645 reviews | |||
| PriceFrom $257 | Free Cancellation | Rating 7.9 13,037 reviews | |||
| PriceFrom $271 | Free Cancellation | Rating 7.0 12,145 reviews | |||
| PriceFrom $276 | Free Cancellation | Rating 7.4 10,319 reviews |
Alaska Airlines Flights From Seattle to Philadelphia
Alaska Airlines flies from Seattle to Philadelphia around 4 times per week, with 13,037 momondo users rating the airline 7.9/10. The cheapest Alaska Airlines deal from Seattle to Philadelphia in the last 72 hours was $257 (round-trip), much lower than the average airfare cost of $484 for Alaska Airlines flights on this route.
Delta Flights From Seattle to Philadelphia
Delta is also a popular choice for this route. Delta flight deals for Seattle to Philadelphia start from as low as $248 round-trip, depending on your selected dates, with average Delta deals seen on momondo around $387. Delta operates 6 flights to Philadelphia from Seattle in an average week. Users have rated it 7.8/10 across 8,645 reviews.
Traveling to a place near Philadelphia?
Book flights to Philadelphia if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Seattle to Philadelphia?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to Philadelphia. Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from Seattle to Philadelphia with flexible booking policies on momondo?
momondo does allow users to show only those flights to Philadelphia from Seattle which offer a flexible booking policy as well as other useful filters and features.
How can momondo help me find flights from Seattle to Philadelphia?
momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to Philadelphia.
I’m not ready to book a flight from Seattle to Philadelphia right now. Can momondo alert me if prices change?
If you are simply researching potential flights to Philadelphia, momondo offers a useful price alert feature which will track prices for flights to Philadelphia from Seattle and alert you when they change.