Are direct flights from Philadelphia to Seattle always the best option?

Direct flights offer convenience by minimizing travel time and avoiding layovers, which can be appealing. However, they are not always the cheapest option. Flights with one or more connections can sometimes be more affordable, depending on the route and demand.

Can flexible travel dates help on Philadelphia to Seattle flights?

Yes, being flexible with your travel dates can significantly impact the cost of your flight. Prices often vary depending on the day of the week, time of year, and demand. Shifting your travel by a few days can sometimes lead to substantial savings on airfare.

What extra costs should I check before booking Philadelphia to Seattle flights?

Before booking, always check for potential extra costs such as baggage fees, seat selection charges, and in-flight services. Some airlines may also charge for carry-on bags or priority boarding. Being aware of these additional fees can help you accurately budget for your trip.

Flights From Philadelphia

To Seattle

Cheap Flights from Philadelphia to Seattle

Browse current best options from Philadelphia. Become a member to unlock all deals and get alerts when new deals appear.

Deals from

Philadelphia

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Prices updated today

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Fares are subject to change and may not be available for all dates. (Data last updated Nov 2, 2026.)

Today’s best flight deals from Philadelphia to Seattle

Explore current cheapest deals departing from Philadelphia to Seattle

2027-01-12 – 2027-02-01
PHL - Seattle
68% AI deal score
$231
$244
Round trip
2027-01-12 – 2027-01-25
PHL - Seattle
69% AI deal score
$240
$244
Round trip
2027-01-12 – 2027-02-08
PHL - Seattle
68% AI deal score
$231
$245
Round trip
2027-02-09 – 2027-02-22
PHL - Seattle
82% AI deal score
$356
$248
Round trip
2026-12-03 – 2026-12-07
PHL - Seattle
73% AI deal score
$347
$336
Round trip
2026-11-25 – 2026-11-30
PHL - Seattle
68% AI deal score
$235
$365
Round trip
2026-12-08 – 2026-12-15
PHL - Seattle
68% AI deal score
$252
$365
Round trip
2027-01-19 – 2027-01-23
PHL - Seattle
67% AI deal score
$204
$366
Round trip
2027-01-23 – 2027-01-24
PHL - Seattle
67% AI deal score
$205
$366
Round trip
2027-04-24 – 2027-04-30
PHL - Seattle
68% AI deal score
$328
$368
Round trip

Philadelphia to Seattle: Overview

Insights for flights from Philadelphia to Seattle

For travelers seeking cheap flights from Philadelphia to Seattle, July stands out as the most affordable month, with a median fare of $328. Other cost-effective options include January, where the median fare is $339, and February, with a median fare of $359. These months offer the best opportunities for budget-conscious travel on this route.

Right now, fares for flights from Philadelphia to Seattle are typically $487–$1187, with a median of $710. Current fares are above the typical level for this route. New deals show up several times a week, so setting up a price alert can help you track fare changes.

A typical journey from Philadelphia to Seattle takes about 5h 53m, including connections. Since most itineraries connect at least once, with a median of 2 stopovers when connecting, the overall travel time reflects the added duration of layovers. The direct flight time is also 5h 53m, but only 9.8% of recent fares are for non-stop flights.

The route from Philadelphia to Seattle covers a distance of 3818 km. This classifies it as a medium-haul journey, indicating a significant but not extremely long flight. Understanding this distance can help you plan for the duration and type of travel experience.

How much is a round trip from Philadelphia to Seattle

Regular price: $292 - $388

Prices for flights from Philadelphia to Seattle are currently below the regular range.

The regular price range for this route is $292-$388. The current lowest deal is $264 with Frontier Airlines, for travel from Feb 9-Feb 17.

now $264

Low $292

High $388

The cheapest time to fly from Philadelphia to Seattle

The cheapest month to fly from Philadelphia to Seattle is July, with a median price of $328. The most expensive month is March, with a median price of $1118. Prices are generally lower from January to October.

July

Cheapest

Flights from $328

March

Most Expensive

Flights from $1,118

Jan

Feb

Mar

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Direct flights from Philadelphia to Seattle

Alaska Airlines, Inc.

Last-minute flights going from Philadelphia to Seattle

Fri, Oct 30

⌛ Last-Minute

PHL - Seattle

Philadelphia (PHL) - Seattle (SEA)

Alaska Airlines, Inc.

$309

$597

One-way

Fri, Nov 13

⌛ Last-Minute

PHL - Seattle

Philadelphia (PHL) - Seattle (SEA)

Allegiant Air

$340

$413

One-way

Sat, Nov 14

⌛ Last-Minute

PHL - Seattle

Philadelphia (PHL) - Seattle (SEA)

United Airlines

$339

$402

One-way

Sat, Nov 14

⌛ Last-Minute

PHL - Seattle

Philadelphia (PHL) - Seattle (SEA)

United Airlines

$297

$435

One-way

Mon, Nov 16

⌛ Last-Minute

PHL - Seattle

Philadelphia (PHL) - Seattle (SEA)

Frontier Airlines

$300

$332

One-way

Mon, Nov 16

⌛ Last-Minute

PHL - Seattle

Philadelphia (PHL) - Seattle (SEA)

Frontier Airlines

$311

$384

One-way

Biggest price drops on these dates for flights from Philadelphia to Seattle

8 nights

Feb 9 - Feb 17

$369 → $264

29%

14 nights

Feb 3 - Feb 17

$357 → $281

21%

15 nights

Feb 2 - Feb 17

$354 → $280

21%

14 nights

Nov 23 - Dec 7

$283 → $279

Popular Airports to fly from Philadelphia to Seattle

Philadelphia - Seattle route insights

💸 Price insights

Recent fares are above the typical level.

Recent fares from Philadelphia to Seattle are above the typical level for this route.

📅 Best time to fly

Fly in July for the lowest median prices.

Historically, July offers the lowest median prices at $328, followed by January at $339.

⏱️ Flight duration

Direct flights average 5h 53m.

The median direct flight from Philadelphia to Seattle is 5h 53m; connecting flights average 22h 21m.

✈️ Airlines & availability

Connecting flights are dominant.

Only 9.8% of recent flights from Philadelphia to Seattle are direct, with connecting flights dominant.

🏆 Airline highlight

Alaska Airlines, Inc. offers direct flights.

Alaska Airlines, Inc. provides direct flight options on this route from Philadelphia to Seattle.

🎯 Booking tip

Deals appear regularly.

Deals for flights from Philadelphia to Seattle appear regularly, often within a 30-day window.

Philadelphia main airports to depart from

Philadelphia International (PHL)

Cheapest

Philadelphia International is a convenient option for flights from Philadelphia to Seattle.

📍 ~11 km from city center (reachable by car or train)

💸 Flights from ~$226

Seattle main airports to arrive at

Seattle–Tacoma International (SEA)

Cheapest

Seattle–Tacoma International Airport is a primary arrival option for flights from Philadelphia to Seattle.

📍 ~18 km from Seattle city center (reachable by car)

💸 Flights from ~$296

Airports nearby Seattle used as alternative

Paine Field Everett (PAE)

Paine Field Everett is a convenient alternative for travelers located in North Seattle or Snohomish County.

📍 ~40 km from Seattle (reachable by car)

💸 Flights from ~$551

Business & First Class Flight Deals to Seattle

Booking flights in advance, often several weeks or months before your intended departure, can sometimes result in lower prices. However, prices can fluctuate, so it's a good idea to monitor fare trends. Avoiding peak travel seasons may also help you find better rates.

Comparing nearby airports at both your origin and destination can sometimes uncover more economical flight options. While it may involve additional travel time to and from these airports, the potential savings on airfare can be significant. Always factor in ground transportation costs when considering this option.

Related routes

More routes from Philadelphia

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Flights to Seattle from other cities

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Philadelphia to Seattle: Overview

Insights for flights from Philadelphia to Seattle

How much is a round trip from Philadelphia to Seattle

Regular price: $292 - $388

Prices for flights from Philadelphia to Seattle are currently below the regular range.

The regular price range for this route is $292-$388. The current lowest deal is $264 with Frontier Airlines, for travel from Feb 9-Feb 17.

now $264

Low $292

High $388

The cheapest time to fly from Philadelphia to Seattle

July

Cheapest

Flights from $328

March

Most Expensive

Flights from $1,118

Jan

Feb

Mar

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Direct flights from Philadelphia to Seattle

Alaska Airlines, Inc.

Last-minute flights going from Philadelphia to Seattle

Fri, Oct 30

⌛ Last-Minute

PHL - Seattle

Philadelphia (PHL) - Seattle (SEA)

Alaska Airlines, Inc.

$309

$597

One-way

Fri, Nov 13

⌛ Last-Minute

PHL - Seattle

Philadelphia (PHL) - Seattle (SEA)

Allegiant Air

$340

$413

One-way

Sat, Nov 14

⌛ Last-Minute

PHL - Seattle

Philadelphia (PHL) - Seattle (SEA)

United Airlines

$339

$402

One-way

Sat, Nov 14

⌛ Last-Minute

PHL - Seattle

Philadelphia (PHL) - Seattle (SEA)

United Airlines

$297

$435

One-way

Mon, Nov 16

⌛ Last-Minute

PHL - Seattle

Philadelphia (PHL) - Seattle (SEA)

Frontier Airlines

$300

$332

One-way

Mon, Nov 16

⌛ Last-Minute

PHL - Seattle

Philadelphia (PHL) - Seattle (SEA)

Frontier Airlines

$311

$384

One-way

Biggest price drops on these dates for flights from Philadelphia to Seattle

8 nights

Feb 9 - Feb 17

$369 → $264

29%

14 nights

Feb 3 - Feb 17

$357 → $281

21%

15 nights

Feb 2 - Feb 17

$354 → $280

21%

14 nights

Nov 23 - Dec 7

$283 → $279

Popular Airports to fly from Philadelphia to Seattle