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Philadelphia International Airport to Seattle-Tacoma International Airport flight

Explore the cheapest one-way and round-trip flights from Philadelphia International Airport to Seattle-Tacoma International Airport over the next 90 days, with one-way fares from TWD 4,255 and round-trip from TWD 10,775. Based on Trip.com's latest 7-day flight data.

      • Cheapest nonstop
        PHL 18:41
        6h
        Direct
        SEA 21:41
        Philadelphia - Seattle | Fri, Oct 23 | Alaska Airlines
        SEA 09:19
        5h 19m
        Direct
        PHL 17:38
        Seattle - Philadelphia | Wed, Oct 28 | Alaska Airlines
        TWD 11,243 TWD 16,258
        31% off
        31% off
        TWD 16,258 TWD 11,243
      • PHL 18:41
        6h
        Direct
        SEA 21:41
        Philadelphia - Seattle | Thu, Oct 22 | Alaska Airlines
        SEA 21:29
        5h 12m
        Direct
        PHL 05:41
        Seattle - Philadelphia | Wed, Oct 28 | Alaska Airlines
        TWD 11,243 TWD 16,258
        31% off
        31% off
        TWD 16,258 TWD 11,243
      • PHL 18:41
        6h
        Direct
        SEA 21:41
        Philadelphia - Seattle | Sun, Oct 18 | Alaska Airlines
        SEA 09:19
        5h 19m
        Direct
        PHL 17:38
        Seattle - Philadelphia | Sun, Oct 25 | Alaska Airlines
        TWD 11,310 TWD 16,258
        30% off
        30% off
        TWD 16,258 TWD 11,310
      • PHL 18:00
        6h 22m
        Direct
        SEA 21:22
        Philadelphia - Seattle | Fri, Oct 23 | American Airlines
        SEA 08:24
        5h 18m
        Direct
        PHL 16:42
        Seattle - Philadelphia | Wed, Oct 28 | American Airlines
        TWD 11,505
        28% off
        TWD 16,258 TWD 11,505
      • PHL 08:50
        6h 19m
        Direct
        SEA 12:09
        Philadelphia - Seattle | Thu, Oct 22 | American Airlines
        SEA 08:24
        5h 18m
        Direct
        PHL 16:42
        Seattle - Philadelphia | Wed, Oct 28 | American Airlines
        TWD 11,505
        28% off
        TWD 16,258 TWD 11,505
      • PHL 08:50
        6h 19m
        Direct
        SEA 12:09
        Philadelphia - Seattle | Sun, Oct 18 | American Airlines
        SEA 22:47
        5h 12m
        Direct
        PHL 06:59
        Seattle - Philadelphia | Sun, Oct 25 | American Airlines
        TWD 11,591
        28% off
        TWD 16,258 TWD 11,591
      • PHL 07:00
        5h 58m
        Direct
        SEA 09:58
        Philadelphia - Seattle | Fri, Oct 23 | Delta Air Lines
        SEA 21:30
        5h 14m
        Direct
        PHL 05:44
        Seattle - Philadelphia | Wed, Oct 28 | Delta Air Lines
        TWD 11,643
        28% off
        TWD 16,258 TWD 11,643
      • PHL 07:00
        5h 58m
        Direct
        SEA 09:58
        Philadelphia - Seattle | Thu, Oct 22 | Delta Air Lines
        SEA 21:30
        5h 14m
        Direct
        PHL 05:44
        Seattle - Philadelphia | Wed, Oct 28 | Delta Air Lines
        TWD 11,643
        28% off
        TWD 16,258 TWD 11,643
      • PHL 07:02
        5h 53m
        Direct
        SEA 09:55
        Philadelphia - Seattle | Thu, Oct 29 | Alaska Airlines
        SEA 08:32
        5h 13m
        Direct
        PHL 16:45
        Seattle - Philadelphia | Mon, Nov 2 | Alaska Airlines
        TWD 11,863
        27% off
        TWD 16,258 TWD 11,863
      • PHL 17:56
        6h 9m
        Direct
        SEA 21:05
        Philadelphia - Seattle | Thu, Dec 3 | Alaska Airlines
        SEA 21:15
        5h 12m
        Direct
        PHL 05:27
        Seattle - Philadelphia | Sun, Dec 6 | Alaska Airlines
        TWD 11,868
        27% off
        TWD 16,258 TWD 11,868
      • PHL 20:44
        16h 4m
        1 stop
        SEA 09:48
        Philadelphia - Seattle | Fri, Oct 16 | Frontier Airlines
        SEA 16:27
        29h 49m
        1 stop
        PHL 01:16
        Seattle - Philadelphia | Fri, Oct 23 | Frontier Airlines
        TWD 10,775
        34% off
        TWD 16,258 TWD 10,775
      • PHL 05:50
        12h 22m
        1 stop
        SEA 15:12
        Philadelphia - Seattle | Fri, Oct 23 | Frontier Airlines
        SEA 21:29
        5h 12m
        Direct
        PHL 05:41
        Seattle - Philadelphia | Tue, Oct 27 | Alaska Airlines
        TWD 10,985
        32% off
        TWD 16,258 TWD 10,985
      • PHL 13:00
        17h 25m
        1 stop
        SEA 14:00
        Philadelphia - Seattle | Tue, Oct 13 | Normal Airline
        SEA 15:00
        6h
        Direct
        PHL 16:00
        Seattle - Philadelphia | Thu, Oct 15 | Normal Airline
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      • Cheapest nonstop
        PHL 07:05
        6h 19m
        Direct
        SEA 10:24
        Philadelphia - Seattle | Fri, Nov 20 | Delta Air Lines
        TWD 5,400 TWD 7,613
        28% off
        28% off
        TWD 7,613 TWD 5,400
      • PHL 18:35
        6h 15m
        Direct
        SEA 21:50
        Philadelphia - Seattle | Thu, Dec 3 | American Airlines
        TWD 5,505 TWD 7,613
        28% off
        28% off
        TWD 7,613 TWD 5,505
      • PHL 18:36
        6h 35m
        Direct
        SEA 22:11
        Philadelphia - Seattle | Fri, Nov 20 | American Airlines
        TWD 5,557 TWD 7,613
        27% off
        27% off
        TWD 7,613 TWD 5,557
      • PHL 07:00
        5h 58m
        Direct
        SEA 09:58
        Philadelphia - Seattle | Mon, Nov 9 | Delta Air Lines
        TWD 5,557
        27% off
        TWD 7,613 TWD 5,557
      • PHL 20:44
        17h 15m
        1 stop
        SEA 10:59
        Philadelphia - Seattle | Tue, Oct 27 | Frontier Airlines
        TWD 4,255
        44% off
        TWD 7,613 TWD 4,255
      • PHL 21:41
        17h 56m
        1 stop
        SEA 12:37
        Philadelphia - Seattle | Tue, Nov 24 | Frontier Airlines
        TWD 4,570
        40% off
        TWD 7,613 TWD 4,570
      • PHL 05:50
        12h 22m
        1 stop
        SEA 15:12
        Philadelphia - Seattle | Sun, Oct 25 | Frontier Airlines
        TWD 4,708
        38% off
        TWD 7,613 TWD 4,708
      • PHL 21:55
        17h 42m
        1 stop
        SEA 12:37
        Philadelphia - Seattle | Sat, Nov 21 | Frontier Airlines
        TWD 4,923
        35% off
        TWD 7,613 TWD 4,923
      • PHL 18:40
        8h 31m
        1 stop
        SEA 00:11
        Philadelphia - Seattle | Thu, Dec 3 | Delta Air Lines
        TWD 5,276
        31% off
        TWD 7,613 TWD 5,276
      • PHL 20:44
        15h 14m
        1 stop
        SEA 08:58
        Philadelphia - Seattle | Thu, Oct 22 | Frontier Airlines
        TWD 5,471
        28% off
        TWD 7,613 TWD 5,471
      • PHL 17:15
        8h 45m
        1 stop
        SEA 23:00
        Philadelphia - Seattle | Thu, Dec 3 | Alaska Airlines
        TWD 5,490
        28% off
        TWD 7,613 TWD 5,490
      • PHL 13:00
        17h 25m
        1 stop
        SEA 14:00
        Philadelphia - Seattle | Tue, Oct 13 | Normal Airline
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Flight fares from Philadelphia International Airport to Seattle-Tacoma 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 Philadelphia International Airport to Seattle-Tacoma International Airport

What is the cheapest month to fly from Philadelphia International Airport to Seattle-Tacoma International Airport?

The data is based on the past 12 months and shows the average one-way ticket prices from Philadelphia International Airport to Seattle-Tacoma International Airport for each month in the Trip.com database.

Based on Trip.com’s data from the past 12 months, if you’re looking for a low-cost one-way ticket from Philadelphia International Airport to Seattle-Tacoma International Airport, the best time to buy is in March, with an average price of TWD 5,355. You’ll want to avoid August, when the average price can reach as high as TWD 14,372.

TWD 14,372
TWD 9,864
TWD 5,355
TWD 847
    Cheapest
  • TWD 7,862
    Oct
  • TWD 8,259
    Nov
  • TWD 9,935
    Dec
  • TWD 5,867
    Jan
  • TWD 8,807
    Feb
  • TWD 5,355
    Mar
  • TWD 10,580
    Apr
  • TWD 8,681
    May
  • TWD 6,916
    Jun
  • TWD 8,298
    Jul
  • TWD 14,372
    Aug
  • TWD 9,468
    Sep

What is the cheapest day of the week to fly from Philadelphia International Airport to Seattle-Tacoma International Airport?

The data is based on the past 12 months and shows the average ticket prices from Philadelphia International Airport to Seattle-Tacoma International Airport for each day of the week in the Trip.com database.

Based on Trip.com’s data from the past 12 months, the cheapest day to depart from Philadelphia International Airport to Seattle-Tacoma International Airport is Saturday, with average fares typically lower than other days. You’ll want to avoid flying on Friday, as ticket prices are usually the highest that day.

TWD 10,124
TWD 8,444
TWD 6,763
TWD 5,083
    Cheapest
  • TWD 9,913
    Mon
  • TWD 7,255
    Tue
  • TWD 7,274
    Wed
  • TWD 8,176
    Thu
  • TWD 10,124
    Fri
  • TWD 6,763
    Sat
  • TWD 8,927
    Sun

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

The cheapest airline flying from Philadelphia International Airport to Seattle-Tacoma International Airport is Frontier Airlines (from TWD 4,255) among 8 carriers operating this route. Based on Trip.com's latest 7-day flight data.

Frontier Airlines
From TWD 4,255
Delta Air Lines
From TWD 5,276
Alaska Airlines
From TWD 5,490
American Airlines
From TWD 5,505
United Airlines
From TWD 5,910
Hahn Air
From TWD 6,010
Sun Country Airlines
From TWD 7,212
Jetblue Airways
From TWD 10,408

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

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

Flight info.
Departure
Arrival
Weekly Schedule

  1. DL2092

    Philadelphia International Airport

    08:26

    PHL

    5h 58m

    11:24

    SEA

    S M T W T F S
    Search

  2. DL2022

    Philadelphia International Airport

    18:40

    PHL

    5h 5m

    Direct

    21:45

    SLC

    S - - W T - S
    Search

  3. DL2998

    Salt Lake City International Airport

    22:45

    SLC

    2h 26m

    Direct

    00:11

    SEA

    S - - W T - S

  4. UA2661

    Philadelphia International Airport

    06:00

    PHL

    6h 3m

    Direct

    09:03

    SFO

    S - - W T F S
    Search

  5. UA2744

    San Francisco International Airport

    12:03

    SFO

    2h 14m

    Direct

    14:17

    SEA

    S M T W T F S

  6. DL2270

    Philadelphia International Airport

    12:09

    PHL

    2h 17m

    Direct

    14:26

    ATL

    S M T W T F S
    Search

  7. DL714

    Hartsfield–Jackson Atlanta International Airport

    18:10

    ATL

    5h 36m

    Direct

    20:46

    SEA

    S M T W T F S

  8. F93339

    Philadelphia International Airport

    20:37

    PHL

    4h 27m

    Direct

    23:04

    DEN

    S M T W T F S
    Search

  9. F91175

    Denver International Airport

    13:07

    DEN

    3h 5m

    Direct

    15:12

    SEA

    S M T W T F S

  10. F91601

    Philadelphia International Airport

    21:55

    PHL

    5h 25m

    Direct

    00:20

    LAS

    S M T W T F S
    Search

  11. F92407

    Harry Reid International Airport

    08:05

    LAS

    2h 54m

    Direct

    10:59

    SEA

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

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

Flight distance 3,821.03km
Cheapest one-way ticket price TWD 4,255
Cheapest return ticket price TWD 10,775

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

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

    Philadelphia International Airport to Seattle-Tacoma International Airport takes about 5 hours 31 minutes on average. Actual flight time may vary depending on route, weather and air traffic.
  • There are around 3 daily flights from Philadelphia International Airport (PHL) to Seattle-Tacoma International Airport (SEA).
  • The earliest flight from Philadelphia International Airport to Seattle-Tacoma International Airport departs at 07:00, and the last departs at 19:35, with about 8 flights per day. Flight times may change, so please check the latest departure and arrival times before you travel.
  • The route from Philadelphia International Airport (PHL) to Seattle-Tacoma International Airport (SEA) is quite popular. Without considering departure times or holidays, tickets cost around TWD 11,109 in October, the most expensive month to book this route.
  • The earliest flight departs from Philadelphia International Airport (PHL) at 07:04 and arrives in Seattle-Tacoma International Airport (SEA) at 09:59.
  • The latest flight departs from Philadelphia International Airport (PHL) at 18:53 and arrives in Seattle-Tacoma International Airport (SEA) at 22:00.
    • The distance from Seattle-Tacoma International Airport to downtown is about 17km, by taxi about 30 minutes.
  • American Airlines is a very popular airline operating an average of 812 flights per month.
  • One-way flights from Philadelphia International Airport to Seattle-Tacoma International Airport currently start from TWD 4,255, and round-trip fares start from TWD 10,775. The current lowest fare is a Frontier Airlines flight departing on Tue, Oct 27; prices may vary depending on availability.
  • Yes. American Airlines, Alaska Airlines and Delta Air Lines operate direct flights from Philadelphia International Airport to Seattle-Tacoma International Airport, with an average flight time of 5 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 Philadelphia International Airport to Seattle-Tacoma International Airport is TWD 8,867. Prices may vary depending on the departure date, airline, and availability.
  • Philadelphia International Airport to Seattle-Tacoma 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 Philadelphia International Airport and Seattle-Tacoma 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.

Most popular destination

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

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Prices displayed in this page are all-inclusive prices (incl. taxes, fuel surcharge, regulatory fees, etc) with all fees confirmed before payment. Fees for baggage, meals, Wi-Fi, or other additional services are also included as shown in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page were updated within last 24 hours—even in real-time. The more popular the route, the more precise the data.

Change & Cancellation Policy

Trip.com displays flight cancellation and change policies for each flight ticket during the booking process, including fees and applicable conditions. Please check the following scenarios:
Voluntary cancellation/change:
To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy.
Cancellation/change due to a flight schedule change:
If the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.