£138 Find Cheap Flights from Philadelphia to Seattle – Compare and Save

These are the earliest and latest flight times available from Philadelphia to Seattle:

• Earliest: departs at 07:00 and lands at 13:14
• Latest: departs at 19:35 and lands at 01:49.

The flight takes about 6h 14m.

Only Economy class is available on flights from Philadelphia to Seattle.

A direct flight from Philadelphia to Seattle takes 6h 14m, covering 2,370 miles.

No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID, or another TSA-accepted form of identification.

Return flights from Philadelphia to Seattle range from £253 to £393, with an average of £321 over the past 12 months. Anything below £253 counts as a good deal.

Last-minute fares on this route (booked within 2 weeks of departure) run 34% above the route average of £321. Book 9 weeks before departure for the lowest fares.

On this route, stopover flights are cheaper than direct options on average. Stopover fares average £225 return via Denver Intl (DEN), compared with £322 for direct.

American Airlines is slightly above the route average for timely arrivals, while Alaska Airlines has a lower on-time arrival rate. On-time arrival rates on Philadelphia to Seattle flights are:

• American Airlines: 84% on time
• Alaska Airlines: 81% on time
• Delta: 78% on time

On average, flights on this route are punctual 82% of the time.

There is no standard. Checked bag policies vary by airline on this route. Most carriers charge £26–£75 for the first checked bag in Economy. Premium fares and elite status bookings typically include a free checked bag.

The Airbus A321-100/200 family is used most often on this route, operated mainly by American Airlines and Delta. Other aircraft seen on the route include Airbus A321neo variants.

Morning is the busiest departure period on Philadelphia to Seattle flights, with 60% leaving in that window. Evening departures account for 40%, Afternoon flights for 0%, and Night flights for 0%.

Three airlines offer in-flight Wi-Fi on Philadelphia to Seattle flights:

• American Airlines
• Alaska Airlines
• Delta

Pricing varies by airline and fare class. Some plans are included with the ticket or loyalty programme, while others are paid add-ons priced by flight length.

One-way fares from Philadelphia to Seattle are currently lower than usual. Average one-way flight prices are about £153, which is 23% below the typical average for this route.

Seattle/Tacoma Intl Airport (SEA) hosts 5 major car hire companies, with daily rates starting from around £3 for economy cars. Top options include:
• Fox
• Europcar
• Thrifty
• Budget
• Dollar

Flights from Philadelphia to Seattle usually depart from Philadelphia (PHL) and arrive at Seattle/Tacoma Intl (SEA).

Morning flights have the fewest delays on this route. Delays tend to pile up throughout the day as one late flight pushes the next, so earlier departures are usually more reliable.

A flight is considered delayed when it departs 15 minutes or more after its scheduled time. This is the standard used by the US Department of Transportation and most airline industry reporting. On the Philadelphia to Seattle route, 18% of flights were delayed in the past 3 months, with delays averaging 2 hours 23 minutes.

One-stop flights from Philadelphia to Seattle most commonly connect through:

• Denver Intl (DEN) – 36% of one-stop connections
• Chicago O'Hare Intl (ORD) – 33% of one-stop connections
• Chicago Midway (MDW) – 8% of one-stop connections
• Detroit Metropolitan Wayne County (DTW) – 6% of one-stop connections

Denver Intl (DEN) handles the largest share of one-stop connections on this route.

Yes. Being flexible with your travel dates can save you up to 21% on the Philadelphia to Seattle route. Wednesday is the cheapest departure day at £291 return on average, while Sunday is the most expensive at £365, a difference of £73. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

3 airlines operate flights between Philadelphia and Seattle. The airlines offering direct flights on this route include:

• American Airlines
• Alaska Airlines
• Delta

Flying via Detroit Metropolitan Wayne County (DTW) gives the shortest average 1-stop total travel time of 7h 09m, compared to 7h 44m via Salt Lake City (SLC) and 7h 45m via Washington, D.C. Dulles Intl (IAD).

Seattle is 3 hours behind Philadelphia (Pacific Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.

Some of the most popular sights in Seattle are The Westin Seattle, Seattle Center, and Seattle Marriott Waterfront. These are among the most viewed places in Seattle on KAYAK.

Among airlines operating Philadelphia to Seattle flights:

• American Airlines: offers extra legroom; offers free seat selection
• Alaska Airlines: offers free seat selection
• Delta: offers extra legroom; offers free seat selection

Extra legroom and free seat selection availability depends on fare class and route.

Here are some options for this route, based on selected ticket types and cabin classes:

• American Airlines: a cabin bag and a checked bag in Economy class
• Alaska Airlines: a cabin bag and a checked bag in Economy class
• Delta: a cabin bag and a checked bag in Economy class

Bag allowance can vary by ticket type, cabin class, route, and airline, so travellers should check the fare details before booking.