SEA - PHL

C$ 231 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 16/7. 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$ 460
Typical prices: C$ 681-C$ 446
Delta
Thu 10/9Sun 13/9
SEA - PHL • Direct
Cheapest direct flights
C$ 460
Typical prices: C$ 706-C$ 450
Delta
Thu 10/9Mon 14/9
SEA - PHL • Direct
Top airlines
Delta
Cheapest • from C$ 460 (round-trip)
Alaska Airlines
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Direct flights
Every day
You can fly direct with Alaska Airlines, American Airlines, and Delta. Average duration is 5h 15m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
When to book
4 weeks
in advance
Our data shows that travellers who book at least 4 weeks in advance save around 42% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
October
Cheapest • 22% 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
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, 10 Sep - Sun, 13 Sep
Delta Logo
9:50 p.m. - 6:05 a.m.
SEA
-
PHL
5h 15mdirect
Delta Logo
7:05 a.m. - 10:04 a.m.
PHL
-
SEA
5h 59mdirect
C$ 460Delta
Wed, 9 Sep - Sun, 13 Sep
Southwest Logo
5:20 a.m. - 6:00 p.m.
SEA
-
PHL
9h 40m
1 stop
Southwest Logo
6:20 a.m. - 1:40 p.m.
PHL
-
SEA
10h 20m
2 stops
C$ 461Southwest
Sat, 25 Jul - Sun, 2 Aug
Frontier Logo
8:13 p.m. - 6:00 a.m.
SEA
-
PHL
30h 47m
1 stop
Frontier Logo
8:37 p.m. - 9:17 a.m.
PHL
-
SEA
15h 40m
1 stop
C$ 464Frontier
Sun, 30 Aug - Fri, 11 Sep
Alaska Airlines Logo
9:27 p.m. - 5:40 a.m.
SEA
-
PHL
5h 13mdirect
Alaska Airlines Logo
6:59 p.m. - 9:51 p.m.
PHL
-
SEA
5h 52mdirect
C$ 467Alaska Airlines
Thu, 27 Aug - Mon, 31 Aug
United Airlines Logo
11:00 p.m. - 9:38 a.m.
SEA
-
PHL
7h 38m
1 stop
United Airlines Logo
3:05 p.m. - 8:18 p.m.
PHL
-
SEA
8h 13m
1 stop
C$ 468United Airlines
Tue, 15 Sep - Tue, 22 Sep
Multiple Airlines Logo
9:27 p.m. - 5:40 a.m.
SEA
-
PHL
5h 13mdirect
Multiple Airlines Logo
3:25 p.m. - 10:38 p.m.
PHL
-
SEA
10h 13m
1 stop
C$ 470Multiple Airlines
Wed, 19 Aug - Sun, 23 Aug
Delta Logo
9:30 p.m. - 5:50 a.m.
SEA
-
PHL
5h 20mdirect
Delta Logo
7:00 p.m. - 11:59 p.m.
PHL
-
SEA
7h 59m
1 stop
C$ 474Delta
Sat, 19 Sep - Sun, 27 Sep
Southwest Logo
5:00 a.m. - 8:45 p.m.
SEA
-
PHL
12h 45m
2 stops
Southwest Logo
6:20 a.m. - 1:15 p.m.
PHL
-
SEA
9h 55m
1 stop
C$ 477Southwest
Tue, 11 Aug - Tue, 18 Aug
United Airlines Logo
7:00 a.m. - 5:54 p.m.
SEA
-
PHL
7h 54m
1 stop
United Airlines Logo
10:34 a.m. - 4:07 p.m.
PHL
-
SEA
8h 33m
1 stop
C$ 478United Airlines
Fri, 14 Aug - Sat, 5 Sep
United Airlines Logo
11:00 p.m. - 9:38 a.m.
SEA
-
PHL
7h 38m
1 stop
United Airlines Logo
1:30 p.m. - 7:07 p.m.
PHL
-
SEA
8h 37m
1 stop
C$ 479United 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.

How much is a round-trip flight from Seattle to Philadelphia?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Seattle to Philadelphia departing in September.

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$ 457 (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$ 730 and C$ 662 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.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at C$ 459 on average.

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 42% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 9 weeks before departure.

Find deals

Good to know

Low seasonFebruary
Cheapest flightC$ 231
Best time to beat the crowds (20% less expensive on average)
Most popular time to fly (10% 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

  • What is the cheapest flight from Seattle to Philadelphia?

    In the last 5 days, the lowest price for a flight from Seattle to Philadelphia was C$ 231 for a one-way ticket and C$ 460 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, Delta, Hawaiian Airlines, United Airlines, and JetBlue.

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

    The Airbus A321neo is the aircraft model that flies most regularly on the Seattle to Philadelphia flight route.

  • Which airline alliances offer flights from Seattle to Philadelphia?

    oneworld is the only airline alliance operating flights between Seattle and Philadelphia.

  • 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$ 647 or less one-way and C$ 459 or less round-trip.

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,Delta

Alaska Airlines,American Airlines, +1 more

Tuesday

Alaska Airlines,American Airlines,Delta

Alaska Airlines,American Airlines, +1 more

Wednesday

Alaska Airlines,American Airlines,Delta

Alaska Airlines,American Airlines, +1 more

Thursday

Alaska Airlines,American Airlines,Delta

Alaska Airlines,American Airlines, +1 more

Friday

Alaska Airlines,American Airlines,Delta

Alaska Airlines,American Airlines, +1 more

Saturday

Alaska Airlines,American Airlines,Delta

Alaska Airlines,American Airlines, +1 more

Sunday

Alaska Airlines,American Airlines,Delta

Alaska Airlines,American Airlines, +1 more

See more nonstop flights

Direct returns

Philadelphia to Seattle/Tacoma Intl

Monday

Alaska Airlines,American Airlines,Delta

Alaska Airlines,American Airlines, +1 more

Tuesday

Alaska Airlines,American Airlines,Delta

Alaska Airlines,American Airlines, +1 more

Wednesday

Alaska Airlines,American Airlines,Delta

Alaska Airlines,American Airlines, +1 more

Thursday

Alaska Airlines,American Airlines,Delta

Alaska Airlines,American Airlines, +1 more

Friday

Alaska Airlines,American Airlines,Delta

Alaska Airlines,American Airlines, +1 more

Saturday

Alaska Airlines,American Airlines,Delta

Alaska Airlines,American Airlines, +1 more

Sunday

Alaska Airlines,American Airlines,Delta

Alaska Airlines,American Airlines, +1 more

See more nonstop flights

Reviews of the top airline flying from Seattle to Philadelphia

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Philadelphia. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to Philadelphia? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
Alaska AirlinesOverall score based on 12511 reviews
7.8Comfort
8.1Boarding
7.0Entertainment
8.5Crew
7.0Food
Airline reviews

People were friendly. Flight was a little delayed. Maybe I missed the reason for it. Overall a nice experience.

8.0 ExcellentScott, Jun 2026
SEA - LAX
Read more Alaska Airlines reviews

People were friendly. Flight was a little delayed. Maybe I missed the reason for it. Overall a nice experience.

Crews were friendly enough. To help the airline I checked my carry on baggage. Typical "gonna be a full flight we need 19 carry on bags to be checked to help out". So I helped out only to have to wait 30+ mins for my luggage and risked not getting to my car rental on time. The return flight was delayed. Kept hearing employees say something about "they didn't have any power" which is kind of concerning. The air flow and air conditioning was insufficient. It was warm and stuffy during the flight. Plus no free wi-fi......Booooooo!

Didn’t even get on, check my flight to Seattle for details. Do better Alaska.

A five hour nonstop flight traveling over a few time zones and over the dinner hour and you get a small bag of pretzels. And no screens to watch movies. I

The flight kept getting delayed due to a maintenance issue. That happens, but there is no excuse for changing the gate FIVE TIMES, including one time nearly all the way across SeaTac. After we were delayed for 3+ hours, they did send us (via email) a $12 meal voucher...except you can't find a $12 meal anywhere in that airport, unless you consider a bag of M&M's and a bottle of water a meal. The plane had one problem after another but finally took off 4.5 hours late. This caused us to miss our hotel shuttle at ORD (they didn't run past midnight and it was 3 am) so we had to wait 25 minutes and pay for an Uber. I did get a $50 flight voucher from Alaska...big deal. Barely covers my Uber ride that I shouldn't have needed.

I upgraded to a better seat and it was much more comfortable. Nobody serves food anymore and actually on a 2+ hr flight not necessary. I didn’t even get water.

Check in & bag drop was straightforward. Alaskair changed the gate approx 40 min before departure, and I only became aware due to Google wallet update to my boarding pass. Had to move from gate N1 to C9 which required use of the Train, luckily I had time available.

Super impressed by staff courtesy, and assistance, Flight was one of the best I've had despite turbulence... Will definitely be flying Alaskan air as my preferred choice

My boarding passes were pulled from my Apple wallet and my 3 family members who were all sitting together in the same row all got put middle seats and were one of the last to board and barely were able to get our bags in the luggage bins.

Was disappointed not to have known Alaska Air offers no music, no flight aware, no films.

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

Information on your arrival and departure airports

Seattle (SEA)
Philadelphia (PHL)