SEA - PHL

C$ 176 Find Cheap Flights from Seattle to Philadelphia

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Philadelphia departing on 20/1. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Philadelphia

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Philadelphia, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Philadelphia, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
C$ 360
Overall average: C$ 518
United Airlines
Thu 15/1Sun 18/1
SEA - PHL • 1 stop
Cheapest direct flights
C$ 382
Typical prices: C$ 464-C$ 1,057
Alaska Airlines
Thu 5/2Mon 9/2
SEA - PHL • Direct
Our travellers' advice
AI-powered summary based on content written by travel experts. AI can make mistakes.
Alaska's Premium Class offers extra legroom and drinks.
Use the SEA Spot Saver for expedited security at SEA.
Expert advice
Expert advice
Expert advice
Expert advice
When to book
4 weeks
in advance
Our data shows that travellers who book at least 4 weeks in advance save around 51% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
October
Cheapest • 23% price drop
June
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Philadelphia!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Seattle to Philadelphia (SEA-PHL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Philadelphia that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seattle to Philadelphia

Thu, 15 Jan - Sun, 18 Jan
United Airlines Logo
7:00 a.m. - 5:34 p.m.
SEA
-
PHL
7h 34m1 stop
United Airlines Logo
6:30 a.m. - 3:44 p.m.
PHL
-
SEA
12h 14m2 stops
C$ 360United Airlines
Fri, 23 Jan - Mon, 26 Jan
United Airlines Logo
5:00 a.m. - 6:54 p.m.
SEA
-
PHL
10h 54m2 stops
United Airlines Logo
3:01 p.m. - 8:57 p.m.
PHL
-
SEA
8h 56m1 stop
C$ 361United Airlines
Sat, 17 Jan - Sat, 24 Jan
United Airlines Logo
5:00 a.m. - 5:34 p.m.
SEA
-
PHL
9h 34m2 stops
United Airlines Logo
10:30 a.m. - 6:26 p.m.
PHL
-
SEA
10h 56m2 stops
C$ 366United Airlines
Thu, 22 Jan - Tue, 27 Jan
United Airlines Logo
5:00 a.m. - 5:34 p.m.
SEA
-
PHL
9h 34m2 stops
United Airlines Logo
6:30 a.m. - 1:57 p.m.
PHL
-
SEA
10h 27m2 stops
C$ 368United Airlines
Sat, 17 Jan - Wed, 21 Jan
Southwest Logo
10:45 a.m. - 8:20 p.m.
SEA
-
PHL
6h 35m1 stop
Southwest Logo
5:00 p.m. - 10:30 p.m.
PHL
-
SEA
8h 30m1 stop
C$ 380Southwest
Thu, 5 Feb - Mon, 9 Feb
Alaska Airlines Logo
9:54 a.m. - 6:03 p.m.
SEA
-
PHL
5h 09mdirect
Alaska Airlines Logo
7:06 p.m. - 10:29 p.m.
PHL
-
SEA
6h 23mdirect
C$ 382Alaska Airlines
Sat, 10 Jan - Thu, 15 Jan
United Airlines Logo
10:58 a.m. - 9:36 p.m.
SEA
-
PHL
7h 38m1 stop
United Airlines Logo
6:30 a.m. - 11:32 a.m.
PHL
-
SEA
8h 02m1 stop
C$ 389United Airlines
Sat, 10 Jan - Wed, 14 Jan
United Airlines Logo
10:58 a.m. - 9:36 p.m.
SEA
-
PHL
7h 38m1 stop
United Airlines Logo
6:30 a.m. - 3:44 p.m.
PHL
-
SEA
12h 14m2 stops
C$ 395United Airlines
Sat, 17 Jan - Wed, 21 Jan
Southwest Logo
10:45 a.m. - 8:20 p.m.
SEA
-
PHL
6h 35m1 stop
Southwest Logo
5:40 a.m. - 4:00 p.m.
PHL
-
SEA
13h 20m2 stops
C$ 397Southwest
Sun, 8 Feb - Tue, 17 Feb
United Airlines Logo
9:25 a.m. - 9:52 p.m.
SEA
-
PHL
9h 27m1 stop
United Airlines Logo
10:35 a.m. - 7:03 p.m.
PHL
-
SEA
11h 28m2 stops
C$ 401United Airlines
Booking Insights

KAYAK's insights & trends for Seattle to Philadelphia flights

Get data-powered insights and trends into flights from Seattle to Philadelphia to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Seattle to Philadelphia?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Philadelphia, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Seattle to Philadelphia is October, where tickets cost C$ 460 (return) on average. On the other hand, the most expensive months are December and August, where the average cost of round-trip tickets is C$ 890 and C$ 653 respectively.

Can I save money by flying with a layover from Seattle to Philadelphia?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of C$ 380, prices are generally cheapest when you fly direct.

How far in advance should I book a flight from Seattle to Philadelphia?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to Philadelphia, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Seattle to Philadelphia, you should book around 4 weeks before departure, which saves you about 51% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 13 weeks before departure.

Find deals
Expert advice

Expert advice for your flight from Seattle to Philadelphia

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
American Airlines

American Airlines' Main Cabin Extra provides early boarding and complimentary drinks for a small fee.


American Airlines offers high-speed Wi-Fi for purchase, with free options for T-Mobile customers.

Read more about American AirlinesBy Harriet Baskas
Alaska Airlines

Alaska Airlines offers a 20-minute baggage guarantee, ensuring quick luggage retrieval or compensation.


Alaska's Premium Class offers extra legroom and complimentary drinks on flights over 350 miles.

Read more about Alaska AirlinesBy Harriet Baskas
Airports
SEA

Use the SEA Spot Saver for free expedited security screening. Book online or via the flySEA app for Checkpoints 2, 3, and 5.

Read more about SEABy Harriet Baskas
PHL

Take the SEPTA train from PHL to Center City for a cost-effective 30-minute ride. Buy a Quick Trip or SEPTA Key card for savings.

Read more about PHLBy Harriet Baskas
Our travel experts
Harriet Baskas

Harriet Baskas

Expert on American Airlines, Alaska Airlines, PHL and SEA

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more

Good to know

Low seasonJanuary
Cheapest flightC$ 176
Best time to beat the crowds (14% less expensive on average)
Most popular time to fly (2% more expensive on average)
Flight from Seattle to Philadelphia

When to book flights from Seattle to Philadelphia

Are your dates flexible? Find out the best times to travel from Seattle to Philadelphia based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Seattle to Philadelphia

  • Where can I sleep at Philadelphia International Airport?

    Minute Suites provides private suites you can rent for an hour or two to work, relax, or take a nap after your flight. Each suite has a bed, blankets, pillows, free Wi-Fi, a phone, desk, and HDTV. The facility is located inside security on the terminal A-B link. If you are staying overnight at the airport, book your stay at the Philadelphia Airport Marriott. You can get to the hotel by taking the Sky Bridge from terminal B or the free shuttle that runs every 20 minutes from each terminal.

  • How can I get downtown from Philadelphia International Airport?

    PHL is served by the SEPTA trains and the SEPTA Regional Airport Line provides services from PHL to downtown Philadelphia. You can also take these trains to get to Amtrack connections. SEPTA also runs buses from PHL and routes 37, 108, and 115 provide regular service to downtown Philadelphia. You can also take taxis or shared rides from the ground transportation area of each terminal. Taxis operating from PHL are metered but have a minimum $10 charge for all destinations.

  • Does Seattle-Tacoma International Airport offer family services?

    SEA has provided private nursing spots for breastfeeding parents dubbed the Mothers Room. These rooms offer comfortable seating, rocking chairs, adjustable lighting, baby changing tables, and more. You’ll find the Mothers Room around the kids’ play area and there is also one in the USO lounge. SEA also provides nursing suites with the same facilities available around the S Gate mezzanine level and gates C10, N2, A9, D10, and D23. SEA has a kids’ play area between the central terminal and A Gates for the older kids.

  • Does Seattle-Tacoma International Airport offer accessibility services?

    SEA is ADA-compliant, and passengers with limited mobility have access to wheelchair assistance at the airport. These passengers will also have access to accessible transportation, accessible restrooms, stair-free pathways, reserved parking spots, and fast-track services. Low-vision passengers will have free Aira services at SEA, while hard-of-hearing passengers get visual paging and TTY telephones.

  • What is the cheapest flight from Seattle to Philadelphia?

    In the last 3 days, the lowest price for a flight from Seattle to Philadelphia was C$ 176 for a one-way ticket and C$ 360 for a round-trip.

  • Which airports will I be using when flying from Seattle to Philadelphia?

    On your way to Philadelphia, you’ll fly out from Seattle/Tacoma Intl. You’ll be landing at Philadelphia.

  • Which airlines offer Wi-Fi service onboard planes from Seattle to Philadelphia?

    All the following airlines offer inflight Wi-Fi service on the Seattle to Philadelphia flight route: American Airlines, Alaska Airlines, JetBlue, Hawaiian Airlines, Delta, Sun Country Air, and United Airlines.

  • Which aircraft models fly most regularly from Seattle to Philadelphia?

    The Boeing 737 MAX 9 is the aircraft model that flies most regularly on the Seattle to Philadelphia flight route.

  • On which days can I fly direct from Seattle to Philadelphia?

    There are direct flights from Seattle to Philadelphia on a daily basis.

  • How does KAYAK find such low prices on flights from Seattle to Philadelphia?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Philadelphia.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Philadelphia?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Philadelphia from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Philadelphia?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Philadelphia with an airline and back to Seattle with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Philadelphia?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Philadelphia from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Seattle to Philadelphia

  • Looking for a cheap flight? 25% of our users found flights on this route for C$ 424 or less one-way and C$ 514 or less round-trip.
  • Seattle-Tacoma International Airport (SEA) is a major transportation hub. It has four terminals, the main and central terminals are next to each other; then there are the north and south satellite terminals. SEA has an airport train running every 10 minutes providing inter-terminal connections.
  • Are you visiting Philadelphia International Airport (PHL) with your pet? The airport has provided pet facilities known as Pet Ports at PHL. There’s at least one in each terminal after security and outdoor areas are outside the baggage claim areas and the departing flights road.
  • On average around 1,066 kg of carbon is emitted on flights from Seattle to Philadelphia. If you wish to fly more sustainably, book your flight with United Airlines. They offer an eco-friendly flight emitting 42% less carbon per passenger on this route.
  • Do you need banking or currency exchange services before your flight? US Bank runs a full-service branch at SEA. You’ll find the bank in the main terminal between security checkpoints 3 and 4.
  • If you got urgent business to attend to after your flight, visit the UPS Store at PHL. The establishment offers business services including copying, faxing, shipping, and notary services. They also have workstations with computers. The establishment is inside security around the terminal A/B walkway.

Prefer to fly direct from Seattle to Philadelphia?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Seattle/Tacoma Intl to Philadelphia.
Find which airlines fly direct from Seattle/Tacoma Intl Airport to Philadelphia Airport, which days they fly and book direct flights.

Direct departures

Seattle/Tacoma Intl to Philadelphia

Monday

Alaska Airlines,American Airlines

Alaska Airlines,American Airlines

Tuesday

Alaska Airlines,American Airlines

Alaska Airlines,American Airlines

Wednesday

Alaska Airlines,American Airlines

Alaska Airlines,American Airlines

Thursday

Alaska Airlines,American Airlines

Alaska Airlines,American Airlines

Friday

Alaska Airlines,American Airlines

Alaska Airlines,American Airlines

Saturday

Alaska Airlines,American Airlines

Alaska Airlines,American Airlines

Sunday

Alaska Airlines,American Airlines

Alaska Airlines,American Airlines

See more nonstop flights

Direct returns

Philadelphia to Seattle/Tacoma Intl

Monday

Alaska Airlines,American Airlines

Alaska Airlines,American Airlines

Tuesday

Alaska Airlines,American Airlines

Alaska Airlines,American Airlines

Wednesday

Alaska Airlines,American Airlines

Alaska Airlines,American Airlines

Thursday

Alaska Airlines,American Airlines

Alaska Airlines,American Airlines

Friday

Alaska Airlines,American Airlines

Alaska Airlines,American Airlines

Saturday

Alaska Airlines,American Airlines

Alaska Airlines,American Airlines

Sunday

Alaska Airlines,American Airlines

Alaska Airlines,American Airlines

See more nonstop flights

Everything you need to know for your flight from Seattle to Philadelphia

Information on your arrival and departure airports

Seattle (SEA)
Philadelphia (PHL)