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Seattle-Tacoma International Airport to Philadelphia International Airport flight

Explore the cheapest one-way and round-trip flights from Seattle-Tacoma International Airport to Philadelphia International Airport over the next 90 days, with one-way fares from TWD 4,704 and round-trip from TWD 11,511. Based on Trip.com's latest 7-day flight data.

      • Cheapest nonstop
        SEA 22:48
        5h 12m
        Direct
        PHL 07:00
        Seattle - Philadelphia | Sat, Oct 10 | American Airlines
        PHL 18:00
        6h 22m
        Direct
        SEA 21:22
        Philadelphia - Seattle | Wed, Oct 14 | American Airlines
        TWD 12,387 TWD 18,152
        32% off
        32% off
        TWD 18,152 TWD 12,387
      • SEA 21:29
        5h 12m
        Direct
        PHL 05:41
        Seattle - Philadelphia | Mon, Nov 2 | Alaska Airlines
        PHL 07:02
        6h 6m
        Direct
        SEA 10:08
        Philadelphia - Seattle | Wed, Nov 4 | Alaska Airlines
        TWD 12,397 TWD 18,152
        32% off
        32% off
        TWD 18,152 TWD 12,397
      • SEA 08:24
        5h 18m
        Direct
        PHL 16:42
        Seattle - Philadelphia | Mon, Nov 2 | American Airlines
        PHL 08:10
        6h 24m
        Direct
        SEA 11:34
        Philadelphia - Seattle | Wed, Nov 4 | American Airlines
        TWD 12,706 TWD 18,152
        30% off
        30% off
        TWD 18,152 TWD 12,706
      • SEA 21:29
        5h 12m
        Direct
        PHL 05:41
        Seattle - Philadelphia | Sat, Oct 10 | Alaska Airlines
        PHL 20:59
        15h 49m
        1 stop
        SEA 09:48
        Philadelphia - Seattle | Wed, Oct 14 | Frontier Airlines
        TWD 11,511
        37% off
        TWD 18,152 TWD 11,511
      • SEA 21:16
        31h 2m
        1 stop
        PHL 07:18
        Seattle - Philadelphia | Thu, Oct 15 | Frontier Airlines
        PHL 07:02
        5h 53m
        Direct
        SEA 09:55
        Philadelphia - Seattle | Sun, Oct 18 | Alaska Airlines
        TWD 11,511
        37% off
        TWD 18,152 TWD 11,511
      • SEA 16:27
        29h 49m
        1 stop
        PHL 01:16
        Seattle - Philadelphia | Mon, Oct 12 | Frontier Airlines
        PHL 05:50
        12h 22m
        1 stop
        SEA 15:12
        Philadelphia - Seattle | Mon, Oct 19 | Frontier Airlines
        TWD 11,697
        36% off
        TWD 18,152 TWD 11,697
      • SEA 16:27
        29h 49m
        1 stop
        PHL 01:16
        Seattle - Philadelphia | Sun, Oct 25 | Frontier Airlines
        PHL 20:44
        17h 15m
        1 stop
        SEA 10:59
        Philadelphia - Seattle | Thu, Oct 29 | Frontier Airlines
        TWD 11,769
        35% off
        TWD 18,152 TWD 11,769
      • SEA 21:30
        5h 14m
        Direct
        PHL 05:44
        Seattle - Philadelphia | Sat, Oct 10 | Delta Air Lines
        PHL 20:59
        15h 49m
        1 stop
        SEA 09:48
        Philadelphia - Seattle | Wed, Oct 14 | Frontier Airlines
        TWD 12,088
        33% off
        TWD 18,152 TWD 12,088
      • SEA 21:45
        30h 33m
        1 stop
        PHL 07:18
        Seattle - Philadelphia | Sat, Oct 10 | Frontier Airlines
        PHL 20:59
        15h 49m
        1 stop
        SEA 09:48
        Philadelphia - Seattle | Wed, Oct 14 | Frontier Airlines
        TWD 12,335
        32% off
        TWD 18,152 TWD 12,335
      • SEA 09:19
        5h 19m
        Direct
        PHL 17:38
        Seattle - Philadelphia | Wed, Oct 14 | Alaska Airlines
        PHL 20:44
        15h 14m
        1 stop
        SEA 08:58
        Philadelphia - Seattle | Tue, Oct 20 | Frontier Airlines
        TWD 12,549
        31% off
        TWD 18,152 TWD 12,549
      • SEA 21:16
        31h 2m
        1 stop
        PHL 07:18
        Seattle - Philadelphia | Sun, Oct 11 | Frontier Airlines
        PHL 20:44
        16h 4m
        1 stop
        SEA 09:48
        Philadelphia - Seattle | Sun, Oct 18 | Frontier Airlines
        TWD 12,573
        31% off
        TWD 18,152 TWD 12,573
      • SEA 23:14
        7h 29m
        1 stop
        PHL 09:43
        Seattle - Philadelphia | Sun, Oct 25 | United Airlines
        PHL 20:44
        17h 15m
        1 stop
        SEA 10:59
        Philadelphia - Seattle | Thu, Oct 29 | Frontier Airlines
        TWD 12,659
        30% off
        TWD 18,152 TWD 12,659
      • SEA 13:00
        17h 25m
        1 stop
        PHL 14:00
        Seattle - Philadelphia | Mon, Oct 5 | Normal Airline
        PHL 15:00
        6h
        Direct
        SEA 16:00
        Philadelphia - Seattle | Wed, Oct 7 | Normal Airline
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      • Cheapest nonstop
        SEA 21:50
        5h 13m
        Direct
        PHL 06:03
        Seattle - Philadelphia | Sat, Nov 21 | Delta Air Lines
        TWD 5,361 TWD 7,910
        32% off
        32% off
        TWD 7,910 TWD 5,361
      • SEA 21:31
        5h 14m
        Direct
        PHL 05:45
        Seattle - Philadelphia | Sun, Nov 8 | Delta Air Lines
        TWD 5,389 TWD 7,910
        32% off
        32% off
        TWD 7,910 TWD 5,389
      • SEA 21:50
        5h 13m
        Direct
        PHL 06:03
        Seattle - Philadelphia | Thu, Nov 19 | Delta Air Lines
        TWD 5,389 TWD 7,910
        32% off
        32% off
        TWD 7,910 TWD 5,389
      • SEA 16:27
        28h 23m
        1 stop
        PHL 23:50
        Seattle - Philadelphia | Fri, Oct 23 | Frontier Airlines
        TWD 4,704
        41% off
        TWD 7,910 TWD 4,704
      • SEA 16:27
        29h 49m
        1 stop
        PHL 01:16
        Seattle - Philadelphia | Mon, Oct 26 | Frontier Airlines
        TWD 4,732
        40% off
        TWD 7,910 TWD 4,732
      • SEA 21:16
        31h 2m
        1 stop
        PHL 07:18
        Seattle - Philadelphia | Thu, Oct 15 | Frontier Airlines
        TWD 5,347
        32% off
        TWD 7,910 TWD 5,347
      • SEA 21:16
        31h 2m
        1 stop
        PHL 07:18
        Seattle - Philadelphia | Mon, Oct 19 | Frontier Airlines
        TWD 5,351
        32% off
        TWD 7,910 TWD 5,351
      • SEA 16:27
        29h 49m
        1 stop
        PHL 01:16
        Seattle - Philadelphia | Mon, Oct 12 | Frontier Airlines
        TWD 5,356
        32% off
        TWD 7,910 TWD 5,356
      • SEA 21:53
        29h 8m
        1 stop
        PHL 06:01
        Seattle - Philadelphia | Mon, Nov 23 | Frontier Airlines
        TWD 5,413
        32% off
        TWD 7,910 TWD 5,413
      • SEA 16:27
        29h 49m
        1 stop
        PHL 01:16
        Seattle - Philadelphia | Sun, Oct 25 | Frontier Airlines
        TWD 5,513
        30% off
        TWD 7,910 TWD 5,513
      • SEA 17:45
        8h 56m
        1 stop
        PHL 05:41
        Seattle - Philadelphia | Thu, Nov 26 | Delta Air Lines
        TWD 5,537
        30% off
        TWD 7,910 TWD 5,537
      • SEA 13:00
        17h 25m
        1 stop
        PHL 14:00
        Seattle - Philadelphia | Mon, Oct 5 | Normal Airline
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Flight prices from Seattle-Tacoma International Airport to Philadelphia International Airport are based on the average fares across airlines for the next three months, based on Trip.com’s latest data.

Trip.com Price Insights: Flights from Seattle-Tacoma International Airport to Philadelphia International Airport

Which month has the cheapest one-way flights from Seattle-Tacoma International Airport to Philadelphia International Airport?

The data is based on Trip.com data from the past 12 months and shows the average one-way fares by month from Seattle-Tacoma International Airport to Philadelphia International Airport.

Based on Trip.com data from the past 12 months, the cheapest one-way flights from Seattle-Tacoma International Airport to Philadelphia International Airport are usually in October, with an average price of TWD 5,563. February sees the highest fares, around TWD 13,877.

TWD 13,877
TWD 9,720
TWD 5,563
TWD 1,406
    Cheapest
  • TWD 5,830
    Sep
  • TWD 5,563
    Oct
  • TWD 12,386
    Nov
  • TWD 8,092
    Dec
  • TWD 11,265
    Jan
  • TWD 13,877
    Feb
  • TWD 10,882
    Mar
  • TWD 9,988
    Apr
  • TWD 10,535
    May
  • TWD 7,358
    Jun
  • TWD 7,332
    Jul
  • TWD 8,790
    Aug

Which day of the week has the cheapest flights from Seattle-Tacoma International Airport to Philadelphia International Airport?

The data is based on Trip.com data from the past 12 months and shows the average fares by each day of the week from Seattle-Tacoma International Airport to Philadelphia International Airport.

Based on Trip.com data from the past 12 months, the cheapest day for flights from Seattle-Tacoma International Airport to Philadelphia International Airport is Friday, with average prices lower than other days. Try to avoid departing on Sunday, as fares are typically the highest.

TWD 12,525
TWD 9,979
TWD 7,433
TWD 4,887
    Cheapest
  • TWD 10,284
    Mon
  • TWD 8,006
    Tue
  • TWD 8,287
    Wed
  • TWD 8,060
    Thu
  • TWD 7,433
    Fri
  • TWD 10,508
    Sat
  • TWD 12,525
    Sun

Which airline offers the cheapest flights from Seattle-Tacoma International Airport to Philadelphia International Airport?

The cheapest airline flying from Seattle-Tacoma International Airport to Philadelphia International Airport is Frontier Airlines (from TWD 4,704) among 8 carriers operating this route. Based on Trip.com's latest 7-day flight data.

Frontier Airlines
From TWD 4,704
Delta Air Lines
From TWD 5,361
Alaska Airlines
From TWD 6,332
American Airlines
From TWD 6,361
United Airlines
From TWD 6,865
Hahn Air
From TWD 7,037
Sun Country Airlines
From TWD 7,203
Jetblue Airways
From TWD 12,754

Find more flights and airlines

What is the flight schedule from Seattle-Tacoma International Airport to Philadelphia International Airport?

Check the schedule for flights from Seattle to Philadelphia and find the flight that best matches your travel plans.

Flight info.
Departure
Arrival
Weekly Schedule

  1. AS371

    Seattle-Tacoma International Airport

    21:29

    SEA

    5h 12m

    05:41

    PHL

    S M T W T F S
    Search

  2. DL1114

    Seattle-Tacoma International Airport

    21:50

    SEA

    5h 17m

    06:07

    PHL

    S M T W T F S
    Search

  3. DL1165

    Seattle-Tacoma International Airport

    17:45

    SEA

    2h 6m

    Direct

    20:51

    SLC

    S M T W T F S
    Search

  4. DL2075

    Salt Lake City International Airport

    23:30

    SLC

    4h 11m

    Direct

    05:41

    PHL

    S - - W T - S

  5. DL554

    Seattle-Tacoma International Airport

    11:50

    SEA

    4h 55m

    Direct

    19:45

    ATL

    S M T W T F S
    Search

  6. DL2642

    Hartsfield–Jackson Atlanta International Airport

    22:55

    ATL

    1h 56m

    Direct

    00:51

    PHL

    S M T W T F S

  7. F93406

    Seattle-Tacoma International Airport

    16:27

    SEA

    2h 50m

    Direct

    20:17

    DEN

    S M T W T F S
    Search

  8. F92440

    Denver International Airport

    10:51

    DEN

    3h 21m

    Direct

    16:12

    RDU

    S - T - T F -

  9. F94844

    Raleigh-Durham International Airport

    21:26

    RDU

    1h 31m

    Direct

    22:57

    PHL

    S - - W T - S

  10. F93406

    Seattle-Tacoma International Airport

    16:27

    SEA

    2h 50m

    Direct

    20:17

    DEN

    S M T W T F S
    Search

  11. F93340

    Denver International Airport

    23:59

    DEN

    3h 40m

    Direct

    05:39

    PHL

    - - - W T - -

  12. F94204

    Seattle-Tacoma International Airport

    21:13

    SEA

    2h 46m

    Direct

    23:59

    LAS

    S - T - T F S
    Search

  13. F91602

    Harry Reid International Airport

    22:04

    LAS

    4h 43m

    Direct

    05:47

    PHL

    - - - W T - -
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About Seattle-Tacoma International Airport and Philadelphia International Airport

Learn about Seattle-Tacoma International Airport (SEA) and Philadelphia International Airport (PHL) — including location, terminals, transportation, and travel tips.

Flight distance 3,821.03km
Cheapest one-way ticket price TWD 4,704
Cheapest return ticket price TWD 11,511

FAQs for Seattle-Tacoma International Airport to Philadelphia International Airport Flights

  • How long is the flight from Seattle-Tacoma International Airport to Philadelphia International Airport?

    Seattle-Tacoma International Airport to Philadelphia International Airport takes about 4 hours 40 minutes on average. Actual flight time may vary depending on route, weather and air traffic.
  • There are around 4 daily flights from Seattle-Tacoma International Airport (SEA) to Philadelphia International Airport (PHL).
  • The earliest flight from Seattle-Tacoma International Airport to Philadelphia International Airport departs at 08:20, and the last departs at 22:45, with about 6 flights per day. Flight times may change, so please check the latest departure and arrival times before you travel.
  • The route from Seattle-Tacoma International Airport (SEA) to Philadelphia International Airport (PHL) is quite popular. Without considering departure times or holidays, tickets cost around TWD 10,593 in October, the most expensive month to book this route.
  • American Airlines is a very popular airline operating an average of 798 flights per month.
  • One-way flights from Seattle-Tacoma International Airport to Philadelphia International Airport currently start from TWD 4,704, and round-trip fares start from TWD 11,511. The current lowest fare is a Frontier Airlines flight departing on Fri, Oct 23; prices may vary depending on availability.
  • Yes. American Airlines, Alaska Airlines and Delta Air Lines operate direct flights from Seattle-Tacoma International Airport to Philadelphia International Airport, with an average flight time of 4 hours 33 minutes, and around 39 weekly flights. Actual flight frequency may vary by season.
  • Based on Trip.com flight data for departures within the next 30 days with at most one stop, the average one-way price from Seattle-Tacoma International Airport to Philadelphia International Airport is TWD 8,758. Prices may vary depending on the departure date, airline, and availability.
  • Seattle-Tacoma International Airport to Philadelphia International Airport operates around 39 weekly flights, mainly by American Airlines, Alaska Airlines and Delta Air Lines. Actual frequency may vary during holidays and seasonal schedule adjustments.
  • Enter Seattle-Tacoma International Airport and Philadelphia International Airport, select your departure date and number of passengers, then compare flights by price, flight duration, and baggage allowance. Once you've chosen a fare, review the change and refund rules, fill in passenger details, and pay to receive your booking confirmation.

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Note: Prices shown on this page are the lowest estimated prices found in the last 24 hours and include all taxes and fees.

Book with no extra fees

Prices displayed on this page are all-inclusive (incl. taxes, fuel surcharges, Civil Aviation Development Fund, etc.), and all fees are shown before payment. Charges for checked baggage, meals, Wi-Fi, and other optional services may also appear in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page have been updated within the last 24 hours, and with many routes refreshed in real time. The more popular the route, the more accurate the data.

Change & Cancellation Policy

Trip.com shows the change and cancellation rules for each ticket during the booking process, including all related fees and conditions. Please refer to the following scenarios:
Voluntary cancellation/change:
To request a change or cancellation, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and flight segment, and submit your request. Please note that additional charges may apply based on the airline’s fare rules.
Cancellation/change due to a flight schedule change:
If your flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For full details of change and cancellation policies, please refer to the customer support pages.