£170 Find Cheap Flights from Philadelphia to Seattle – Compare and Save

The cheapest month for flights from Philadelphia to Seattle is January, where tickets cost £249 (return) on average. On the other hand, the most expensive months are August and July, where the average cost of round-trip tickets is £348 and £345 respectively.

To get a below average price on the flight from Philadelphia to Seattle, you should book around 5 weeks before departure, which saves you about 30% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 9 weeks before departure.

In the past 5 days, the cheapest return tickets from Philadelphia to Seattle were found on United Airlines (£291) and Alaska Airlines (£295).

Philadelphia and Seattle are connected by different airlines. The airlines that fly that route the most regularly are Alaska Airlines (14 flights per week), American Airlines (11 flights per week), and Delta (7 flights per week).

Weekly flights between Philadelphia and Seattle historically see delays in approximately 18% of cases, with the average delay over the past year being 159 minutes.

Typically, flights leaving in the morning tend to face fewer delays, whereas flights in the early afternoon have historically encountered delays more often.

Statistically, Wednesday is the day of the week with the fewest delays on this flight route, while Thursday has typically experienced more delays than other days.

Based on our data, American Airlines have experienced the fewest delays on this route in the past 12 months, with only about 16% of their flights encountering any delays.

There is only one cabin class option available for the route, which is Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

Each day, there are between 4 and 5 direct flights that take off from Philadelphia and land in Seattle, with an average flight time of 6h 17m. The most common departure time is 07:00 and most flights take off in the morning. Each week, there are 32 flights. The most frequent day of departure is Monday, when 16% of all weekly flights depart. The fewest flights depart on a Tuesday.