PIT to SEA flight delays
Pittsburgh, PA (PIT) Seattle, WA (SEA) · 2,125 miles
471 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
71.12%
Arrived on time
Within 15 minutes of schedule
1.27%
Cancelled
Share of scheduled flights
55 min
When late, late by
Average across delayed arrivals
17 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The season swings this route hard. In October it ran 52.5 points more punctual than in December — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
This route does worse than its own airport. PIT as a whole runs 11.5 points more punctual than these flights, which points at something specific to the route — the time of day it is scheduled, or the aircraft that feed it — rather than the airport.
The two directions do not behave alike. SEA to PIT arrives on time 6.8 points more often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
Only Alaska Airlines flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
Which airline should you fly on this route?
Over January 2025 – August 2026, Alaska Airlines arrived on time most often on PIT to SEA. Flights ran closest to schedule in October and worst in December.
Every airline on PIT to SEA
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Alaska Airlines | 471 | 71.12% | 1.27% | 55 min | D |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
SEA to PIT Seattle back to Pittsburgh 77.9% on time COther routes from Pittsburgh
Common questions
Are flights from Pittsburgh to Seattle usually delayed?
71.12% of flights on the PIT to SEA route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airlines fly from Pittsburgh to Seattle?
Only Alaska Airlines appears in the published record on this route, with 471 flights and 71.12% arriving on time.
How often are PIT to SEA flights cancelled?
1.27% of scheduled flights did not operate — about 13 in every thousand. That is in the normal range.
What is the best month to fly Pittsburgh to Seattle?
October, when 93.9% of flights arrived on time. The worst was December at 41.4%.
When PIT to SEA flights are late, how late are they?
About 55 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on PIT to SEA during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →