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Flights from Seattle to Philadelphia

What to know about flights from Seattle to Philadelphia?

The distance between Seattle and Philadelphia is approximately 3,816.94 km. It takes around 5 hours 17 minutes on average to fly from Seattle to Philadelphia. Based on Trip.com's data, travel demand peaks in July. The cheapest month to book is November.

Cheapest one-way
$124
Frontier Airlines Frontier Airlines SEA-PHL 31h 2m · 1 stop Thu, Oct 8
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Cheapest round-trip
$307
Frontier Airlines Frontier Airlines SEA-PHL 19h 36m · 1 stop Thu, Sep 17 - Sun, Sep 20
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Recommended airlines
Frontier Airlines Frontier Airlines Cheapest · From $124 Delta Air Lines Delta Air Lines Most booked
When to travel
October
Cheapest
July
Peak season for travel
Route details
3,816.94 km
Flight distance
5h 17m
Average flight time

Explore the cheapest one-way and round-trip flights from Seattle to Philadelphia over the next 90 days, with one-way fares from $124 and round-trip from $307. Based on Trip.com's latest 7-day flight data.

      • Cheapest nonstop
        SEA 9:30 PM
        5h 20m
        Nonstop
        PHL 5:50 AM
        Seattle - Philadelphia | Thu, Sep 17 | Delta Air Lines
        PHL 7:05 AM
        5h 51m
        Nonstop
        SEA 9:56 AM
        Philadelphia - Seattle | Sun, Sep 20 | Delta Air Lines
        $337 $480
        30% off
        30% off
        $480 $337
      • SEA 12:40 PM
        5h 24m
        Nonstop
        PHL 9:04 PM
        Seattle - Philadelphia | Thu, Sep 17 | American Airlines
        PHL 7:05 AM
        5h 51m
        Nonstop
        SEA 9:56 AM
        Philadelphia - Seattle | Sun, Sep 20 | Delta Air Lines
        $339 $480
        28% off
        28% off
        $480 $339
      • SEA 9:27 PM
        5h 13m
        Nonstop
        PHL 5:40 AM
        Seattle - Philadelphia | Thu, Sep 17 | Alaska Airlines
        PHL 7:00 AM
        5h 51m
        Nonstop
        SEA 9:51 AM
        Philadelphia - Seattle | Sun, Sep 20 | Alaska Airlines
        $349 $480
        27% off
        27% off
        $480 $349
      • SEA 7:00 AM
        19h 36m
        1 stop
        PHL 5:36 AM
        Seattle - Philadelphia | Thu, Sep 17 | Frontier Airlines
        PHL 7:05 AM
        5h 51m
        Nonstop
        SEA 9:56 AM
        Philadelphia - Seattle | Sun, Sep 20 | Delta Air Lines
        $307
        36% off
        $480 $307
      • SEA 9:29 PM
        5h 12m
        Nonstop
        PHL 5:41 AM
        Seattle - Philadelphia | Fri, Oct 9 | Alaska Airlines
        PHL 8:44 PM
        16h 7m
        1 stop
        SEA 9:51 AM
        Philadelphia - Seattle | Mon, Oct 12 | Frontier Airlines
        $329
        31% off
        $480 $329
      • SEA 9:29 PM
        5h 8m
        Nonstop
        PHL 5:37 AM
        Seattle - Philadelphia | Fri, Oct 9 | Delta Air Lines
        PHL 8:44 PM
        16h 7m
        1 stop
        SEA 9:51 AM
        Philadelphia - Seattle | Mon, Oct 12 | Frontier Airlines
        $336
        30% off
        $480 $336
      • SEA 9:29 PM
        5h 12m
        Nonstop
        PHL 5:41 AM
        Seattle - Philadelphia | Wed, Oct 7 | Alaska Airlines
        PHL 8:59 PM
        15h 49m
        1 stop
        SEA 9:48 AM
        Philadelphia - Seattle | Sun, Oct 11 | Frontier Airlines
        $361
        25% off
        $480 $361
      • SEA 9:30 PM
        5h 14m
        Nonstop
        PHL 5:44 AM
        Seattle - Philadelphia | Wed, Oct 7 | Delta Air Lines
        PHL 8:59 PM
        15h 49m
        1 stop
        SEA 9:48 AM
        Philadelphia - Seattle | Sun, Oct 11 | Frontier Airlines
        $379
        21% off
        $480 $379
      • SEA 1:00 PM
        17h 25m
        1 stop
        PHL 2:00 PM
        Seattle - Philadelphia | Thu, Sep 10 | Normal Airline
        PHL 3:00 PM
        6h
        Nonstop
        SEA 4:00 PM
        Philadelphia - Seattle | Sat, Sep 12 | Normal Airline
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      • Cheapest nonstop
        SEA 9:30 PM
        5h 20m
        Nonstop
        PHL 5:50 AM
        Seattle - Philadelphia | Sun, Sep 27 | Delta Air Lines
        $168 $216
        22% off
        22% off
        $216 $168
      • SEA 9:31 PM
        5h 14m
        Nonstop
        PHL 5:45 AM
        Seattle - Philadelphia | Thu, Nov 5 | Delta Air Lines
        $169 $216
        22% off
        22% off
        $216 $169
      • SEA 9:30 PM
        5h 20m
        Nonstop
        PHL 5:50 AM
        Seattle - Philadelphia | Sun, Sep 20 | Delta Air Lines
        $170 $216
        21% off
        21% off
        $216 $170
      • SEA 9:30 PM
        5h 20m
        Nonstop
        PHL 5:50 AM
        Seattle - Philadelphia | Wed, Sep 30 | Delta Air Lines
        $170
        21% off
        $216 $170
      • SEA 9:16 PM
        31h 2m
        1 stop
        PHL 7:18 AM
        Seattle - Philadelphia | Thu, Oct 8 | Frontier Airlines
        $124
        43% off
        $216 $124
      • SEA 9:16 PM
        31h 2m
        1 stop
        PHL 7:18 AM
        Seattle - Philadelphia | Mon, Oct 12 | Frontier Airlines
        $145
        33% off
        $216 $145
      • SEA 4:27 PM
        28h 23m
        1 stop
        PHL 11:50 PM
        Seattle - Philadelphia | Tue, Oct 20 | Frontier Airlines
        $149
        31% off
        $216 $149
      • SEA 4:07 PM
        28h 4m
        1 stop
        PHL 11:11 PM
        Seattle - Philadelphia | Tue, Oct 13 | Alaska Airlines
        $168
        22% off
        $216 $168
      • SEA 1:00 PM
        17h 25m
        1 stop
        PHL 2:00 PM
        Seattle - Philadelphia | Thu, Sep 10 | Normal Airline
        Find more flights
        Find more flights

Flight.News
Flights from Seattle to Philadelphia operate an average of 9 times per day over the past 7 days, with a 17.2% on-time departure rate and a 73.2% on-time arrival rate.

Which airlines are the most popular for Seattle to Philadelphia flights?

The most popular airlines flying from Seattle to Philadelphia are Delta Air Lines, Frontier Airlines, and Alaska Airlines, among 4 carriers on this route. Frontier Airlines offers the lowest fares. Based on Trip.com's flight booking data from the previous 12 months.
Delta Air Lines logo Delta Air Lines
Frontier Airlines logo Frontier Airlines
Alaska Airlines logo Alaska Airlines
American Airlines logo American Airlines
Airlines are determined based on actual purchased flight tickets from Seattle to Philadelphia according to previous 12 months data from Trip.com.

Trip.com price insights on flights from Seattle to Philadelphia

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

The average price of one-way flights from Seattle to Philadelphia purchased by Trip.com users by month over the past 12 months.

Based on Trip.com’s data, the cheapest month for flights from Seattle to Philadelphia is October, with an average price of $175; while the month with the highest flight price is usually February, with an average price of up to $435.

$435
$305
$175
$45
    Cheapest
  • $183
    Sep
  • $175
    Oct
  • $388
    Nov
  • $254
    Dec
  • $353
    Jan
  • $435
    Feb
  • $341
    Mar
  • $313
    Apr
  • $330
    May
  • $231
    Jun
  • $230
    Jul
  • $276
    Aug

Frequently Asked Questions

  • What are the cheapest flights from Seattle to Philadelphia (SEA-PHL)?

    Based on Trip.com data, Frontier Airlines offers one-way fares as low as $124 on Cheapest nonstop routes (e.g. SEA to PHL on Thu, Oct 8), while Frontier Airlines offers Cheapest nonstop round-trips from $307 departing on Thu, Sep 17 and returning on Sun, Sep 20.
  • At the moment, you can catch a nonstop flight from Seattle to Philadelphia with the following airlines, including: Delta Air Lines Alaska Airlines American Airlines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.
  • It takes around 5 hours 17 minutes to fly from Seattle (SEA) to Philadelphia (PHL).
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Seattle to Philadelphia is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • Based on Trip.com data in the past 4 weeks, there is 33 flight per week flying from Seattle to Philadelphia. You can check the weekly schedule for popular airlines on this route below: Delta Air Lines: S/M/T/W/T/F/S -- DL1114 (21:42) Alaska Airlines: S/M/T/W/T/F/S -- AS442 (10:59)
  • To find best deals on flights from Seattle to Philadelphia, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Thu, Oct 8, with one-way flights priced at just $124.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Delta Air Lines.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for Philadelphia travel is around July.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Seattle to Philadelphia is November, when demand for travel is lower.
  • You can arrive at any of the following airports in Philadelphia: Philadelphia International Airport (PHL), and Trenton Mercer Airport (TTN). Flights from Seattle-Tacoma International Airport to Philadelphia International Airport (SEA-PHL) are by far the most popular option for this route.
  • The time difference between Philadelphia and Seattle is 3h.
  • Tickets can only be changed or canceled if permitted by airline policy. 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. However, 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.
  • Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from Seattle to Philadelphia is $267. Fares vary by travel date, airline and availability.
  • Based on Trip.com data for travel in the next 30 days, the average round-trip fare from Seattle to Philadelphia is $430. The final price depends on the outbound and return dates, airline and fare conditions.
  • Enter Seattle and Philadelphia, choose your travel dates and passengers, then compare flights by price, duration and baggage. Select a fare, review the change and cancellation rules, enter traveler details and complete payment to receive your confirmation.
  • Frontier Airlinesare the most popular budget airlines flying from Seattle to Philadelphia. Check baggage, seat and payment fees before comparing the final price.

Explore More Popular Flights

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

Book with no extra fees

Prices displayed in this page are all-inclusive prices (incl. taxes, fuel surcharge, civil aviation development fund, etc) with all fees confirmed before payment. Fees for luggage, meals, WLAN, 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.