Seattle

$76+ Cheap flights from Pennsylvania to Seattle (SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SEA
Apr 9 — Apr 161
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Cheap flight deals from Pennsylvania to Seattle

Cheapest flights from Pennsylvania to Seattle
Explore the most affordable flight options available from Pennsylvania to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 10, 2026.

This Alaska Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/27:00 am
IAD
-
SEA
Nonstop5h 53m
Alaska Airlines
Tue 4/149:40 pm
SEA
-
IAD
Nonstop5h 00m
Alaska Airlines
Deal found 3/8$198
This Kiwi.com deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:00 pm
DCA
-
SEA
1 stop18h 27m
Frontier
Tue 4/147:12 pm
SEA
-
DCA
1 stop18h 47m
Frontier
Deal found 3/5$198
This Southwest deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/286:00 pm
PIT
-
SEA
1 stop7h 30m
Southwest
Sat 5/211:55 pm
SEA
-
PIT
1 stop7h 05m
Southwest
Deal found 3/9$199
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/225:55 pm
IAD
-
SEA
Nonstop5h 58m
United Airlines
Wed 4/2911:35 pm
SEA
-
IAD
1 stop8h 53m
United Airlines
Deal found 3/6$199
This American Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/255:00 pm
DCA
-
SEA
1 stop8h 47m
American Airlines
Wed 4/291:19 pm
SEA
-
DCA
1 stop7h 38m
American Airlines
Deal found 3/6$199
This Orbitz deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/168:00 am
DCA
-
SEA
1 stop10h 05m
Frontier
Sat 4/187:12 pm
SEA
-
DCA
1 stop14h 48m
Frontier
Deal found 3/6$200
This Frontier deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/256:00 pm
DCA
-
SEA
1 stop18h 27m
Frontier
Sat 5/27:12 pm
SEA
-
DCA
1 stop14h 48m
Frontier
Deal found 3/9$201
This United Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/85:55 pm
IAD
-
SEA
Nonstop5h 58m
United Airlines
Wed 4/158:00 am
SEA
-
IAD
Nonstop5h 11m
United Airlines
Deal found 3/9$202
This Kiwi.com deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/56:00 pm
DCA
-
SEA
1 stop20h 37m
Frontier
Fri 4/177:12 pm
SEA
-
DCA
1 stop14h 48m
Frontier
Deal found 3/6$202
This Kiwi.com deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/211:59 pm
DCA
-
SEA
1 stop22h 28m
Frontier
Tue 4/287:12 pm
SEA
-
DCA
1 stop18h 47m
Frontier
Deal found 3/6$203
This Alaska Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/257:10 am
IAD
-
SEA
Nonstop5h 48m
Alaska Airlines
Wed 4/299:41 pm
SEA
-
IAD
Nonstop5h 09m
Alaska Airlines
Deal found 3/9$204
This Delta deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/34:40 pm
DCA
-
SEA
Nonstop5h 54m
Delta
Wed 4/156:00 am
SEA
-
DCA
1 stop9h 00m
Delta
Deal found 3/8$204

Find flight deals from Pennsylvania to Seattle

Keep the following information in mind while searching for Pennsylvania to Seattle flight deals. Data was last updated March 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$198
(Alaska Airlines)

One-way from

$76
(Trip.com)

Popular in

June

Cheapest in

October

Average price

$357

Good round-trip deal

$300 or less

Good one-way deal

$195 or less
Provider with most accurate pricing for Philadelphia-Seattle/Tacoma Intl flight deals.
Provider most trusted by Cheapflights users for Philadelphia-Seattle/Tacoma Intl flights.
From Pennsylvania to Seattle/Tacoma Intl
One-way flight from Pennsylvania to Seattle/Tacoma Intl
Highest demand for flights based on searches. 12% potential increase in price ($58 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Average for round-trip flights in March 2026
Price to beat on a round-trip flight from Pennsylvania to Seattle/Tacoma Intl.
Price to beat on a one-way flight from Pennsylvania to Seattle/Tacoma Intl.

Cheapflights Fare Finder

 
Customize your flight search to find flights from Pennsylvania to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 10, 2026.
Use the filters below to find and compare flights from Pennsylvania to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PittsburghSeattle

PIT - SEA

PITSEA

Pittsburgh

Tue 6/2

7:25 pm-11:43 pm

1 stop7h 18m

Seattle/Tacoma Intl

Thu 6/11

9:58 pm-9:35 am

1 stop8h 37m

$211

PittsburghSeattle

PIT - SEA

PITSEA

Pittsburgh

Wed 6/3

5:10 pm-11:43 pm

1 stop9h 33m

Seattle/Tacoma Intl

Sat 6/13

11:53 pm-10:04 am

1 stop7h 11m

$211

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Sat 4/4

7:00 am-9:53 am

Nonstop5h 53m

Seattle/Tacoma Intl

Mon 4/13

9:40 pm-5:40 am

Nonstop5h 00m

$217

NewarkSeattle

EWR - SEA

EWRSEA

Newark

Thu 5/7

8:49 pm-11:59 pm

Nonstop6h 10m

Seattle/Tacoma Intl

Mon 5/11

7:25 am-3:49 pm

Nonstop5h 24m

$239

NewarkSeattle

EWR - SEA

EWRSEA

Newark

Fri 4/24

1:00 pm-7:00 pm

1 stop9h 00m

Seattle/Tacoma Intl

Tue 4/28

10:55 pm-7:16 am

Nonstop5h 21m

$248

NewarkSeattle

EWR - SEA

EWRSEA

Newark

Wed 4/8

4:55 pm-10:56 pm

1 stop9h 01m

Seattle/Tacoma Intl

Mon 4/13

10:55 pm-7:16 am

Nonstop5h 21m

$248

New YorkSeattle

JFK - SEA

JFKSEA

New York John F Kennedy Intl

Wed 5/13

4:50 pm-8:07 pm

Nonstop6h 17m

Seattle/Tacoma Intl

Tue 5/19

4:00 pm-12:28 am

Nonstop5h 28m

$257

NewarkSeattle

EWR - SEA

EWRSEA

Newark

Fri 4/24

9:00 am-12:11 pm

Nonstop6h 11m

Seattle/Tacoma Intl

Tue 5/5

10:09 pm-6:39 am

Nonstop5h 30m

$267

NewarkSeattle

EWR - SEA

EWRSEA

Newark

Thu 4/16

7:20 am-10:29 am

Nonstop6h 09m

Seattle/Tacoma Intl

Mon 4/20

2:50 pm-11:11 pm

Nonstop5h 21m

$268

New YorkSeattle

JFK - SEA

JFKSEA

New York John F Kennedy Intl

Sun 9/6

6:40 pm-10:16 pm

Nonstop6h 36m

Seattle/Tacoma Intl

Wed 9/9

3:30 pm-12:09 am

Nonstop5h 39m

$276

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/8

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Pennsylvania to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Pennsylvania with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Pennsylvania to Seattle

What is the cheapest month to book a flight from Pennsylvania to Seattle?

Currently, February is the cheapest month in which you can book a flight from Pennsylvania to Seattle (average of $167). Flying from Pennsylvania to Seattle in September is currently the most expensive (average of $216). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from PA to SEA?

Find hourly flight availability from Pennsylvania to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 10, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Pennsylvania to Seattle as you normally would.

Weekly flight availability from Pennsylvania to Seattle

Explore weekly flight availability from Pennsylvania to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated March 10, 2026.

The most flights from USPA to SEA are scheduled on a Monday (6 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (3 on average).

Related info for your journey

Find useful and relevant information for your journey from Pennsylvania to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What airport do you fly into for flights to Seattle from Pennsylvania?

    Seattle/Tacoma Intl (SEA) is the airport you will fly into if you book a flight from Pennsylvania to Seattle. It is only a 11.4 mi journey from Seattle/Tacoma Intl (SEA) to Seattle’s city center.

  • How popular is this Pennsylvania to Seattle flight route?

  • How long is the flight from Pennsylvania to Seattle?

    Departing from Pennsylvania to Seattle will take you 5h 53m. Pennsylvania and Seattle are separated by a distance of 2299 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Pennsylvania to Seattle one-way?

    $89 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on Spirit Airlines and Southwest, with prices starting from $91 and $97, respectively.

  • What are the most popular routes from Pennsylvania to Seattle?

  • What are the most reliable airlines from Pennsylvania to Seattle?

    The top 3 most reliable airlines when flying from Pennsylvania to Seattle are STARLUX Airlines (82%), British Airways (75%) and American Airlines (74%).

  • What are the cheapest flights from Pennsylvania to Seattle?

    On average you can expect to pay $982 for a flight from Pennsylvania to Seattle. The cheapest flight overall is $138 while the most popular route, (Newark - Seattle/Tacoma Intl) is currently priced at $249.

  • Can I find deals for flights from Pennsylvania to Seattle that include hotel bookings?

    Yes. In addition to deals on Pennsylvania to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Pennsylvania to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Pennsylvania to Seattle.

  • Can I find deals for business class flights from Pennsylvania to Seattle?

    Yes. Cheapflights offers flight deals from Pennsylvania to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Pennsylvania to Seattle?

    Currently, February is the cheapest month in which you can book a flight from Pennsylvania to Seattle (average of $167). Flying from Pennsylvania to Seattle in September is currently the most expensive (average of $216). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
SeaTac
Lakewood
Ocean Shores
Olympia
Kent
Lynnwood
Edmonds
Lacey
Renton
Puyallup
Kirkland
Tukwila
Fife
Aberdeen
Shoreline
Marysville
Centralia
Federal Way
Chehalis

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Pennsylvania to Seattle

See prices for flight routes from nearby airports that may be better suited for you.

Top 8 airlines flying from Pennsylvania to Seattle

Discover the top 8 airlines that operate flights from Pennsylvania to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$99Average$226FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$115Average$237FlexibilityNo cancel feeOn-time65%
DeltaCheapest$123Average$351FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$157Average$405FlexibilityNo cancel feeOn-time63%
Hawaiian AirlinesCheapest$176Average$436FlexibilityNo cancel feeOn-time85%
American AirlinesCheapest$178Average$496FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$202Average$480FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$221Average$458FlexibilityNo cancel feeOn-time69%

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