Cheap Flights from Philadelphia to Seattle
No deal from Philadelphia to Seattle has cleared our price bar yet. What we have seen on the route is below.
Across 3 months of observations from Philadelphia to Seattle, the lowest round-trip fare we recorded was $231, in September. The typical fare was $333. September was the cheapest month we saw and October the dearest.
The most recent price we saw on this route was $420 on Delta and Frontier, seen Oct 17. It is an unverified observation and may have changed.
See every deal <a href="/from/philadelphia">from Philadelphia</a>, <a href="/to/seattle">to Seattle</a>, or the return direction <a href="/from/seattle/to/philadelphia">Seattle to Philadelphia</a>.
Latest price we saw: Philadelphia to Seattle
The most recent round-trip fare our sweep found on this route. It is not verified and may have changed since the date shown.
| From | Price | Per mile | Travel dates | Airline | Seen | Check price |
|---|---|---|---|---|---|---|
| Philadelphia (PHL) to Seattle (SEA) | $420 | 8.8¢ | Nov 15 – Nov 21 | Delta and Frontier | Oct 17 | Check price |
Price history: Philadelphia to Seattle
What we observed by month, from our signals database. Unverified observations, not bookable prices.
| Month | Low | Typical | Sightings |
|---|---|---|---|
| Oct 2026 | $271 | $347 | 15 |
| Sep 2026 | $231 | $349 | 174 |
| Aug 2026 | $247 | $303 | 61 |
Frequently asked questions
How many flight deals from Philadelphia to Seattle are on Sparkflights right now?
There are 0 verified deals from Philadelphia to Seattle on the board right now. The list refreshes hourly.
What is the lowest price ever seen from Philadelphia to Seattle?
The lowest fare we've recorded from Philadelphia to Seattle is $231, based on 250 price observations over 3 months.
How much does a flight from Philadelphia to Seattle cost?
The typical round-trip fare we observed from Philadelphia to Seattle is $333, against a recorded low of $231. These are observations, not quotes.
When is the cheapest month to fly Philadelphia to Seattle?
September was the cheapest month we observed from Philadelphia to Seattle and October the dearest, over 3 months of data.
What is the current price from Philadelphia to Seattle?
The most recent fare our sweep saw from Philadelphia to Seattle is $420, on Oct 17. It is an unverified observation rather than a verified deal, so check it before booking.