BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
PDX→SEA

Portland, OR (PDX) to Seattle, WA (SEA) flight delay odds

84.3% of 4,938 official scheduled PDX-to-SEA flights arrived on time; 7.8% arrived at least 30 minutes late and 0.6% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALLower disruption
84.3%arrived on time
7.8%30+ min late
0.6%cancelled
4,938scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late3.7%all scheduled flights
120+ minutes late1.5%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+0.3 mincompleted flights

Which departure time was most reliable for PDX to SEA?

Among qualifying PDX-to-SEA departure window results, Early morning had the highest on-time rate: 89.9% of 1,332 flights. Evening was lowest at 79.9% across 984 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning1,33289.9%4.4%0.5%
Late morning1,10582.8%7.9%0.4%
Afternoon1,36583.0%8.9%0.7%
Evening98479.9%10.8%0.9%
Night15284.9%7.9%1.3%

Which weekday was most reliable for PDX to SEA?

Among qualifying PDX-to-SEA weekday results, Saturday had the highest on-time rate: 86.7% of 631 flights. Thursday was lowest at 81.2% across 713 flights.

DayFlightsOn time30+ minCancelled
Monday72485.1%5.9%0.4%
Tuesday73786.4%8.0%0.4%
Wednesday71684.4%6.7%0.4%
Thursday71381.2%9.5%0.6%
Friday71181.7%9.3%1.4%
Saturday63186.7%7.0%0.8%
Sunday70684.6%8.2%0.6%

Which airline was most reliable for PDX to SEA?

Among qualifying PDX-to-SEA airline results, Delta Air Lines had the highest on-time rate: 87.8% of 312 flights. Alaska Airlines was lowest at 81.7% across 1,125 flights.

AirlineFlightsOn time30+ minCancelled
SkyWest Airlines3,50184.8%8.0%0.5%
Alaska Airlines1,12581.7%7.9%1.2%
Delta Air Lines31287.8%5.8%0.0%

Which month was most reliable for PDX to SEA?

Among qualifying PDX-to-SEA month results, February 2026 had the highest on-time rate: 91.0% of 343 flights. July 2025 was lowest at 75.9% across 423 flights.

MonthFlightsOn time30+ minCancelled
July 202542375.9%14.2%0.0%
August 202544480.2%10.4%0.5%
September 202546383.6%7.3%0.0%
October 202545887.8%4.8%0.4%
November 202544186.2%4.8%3.4%
December 202541279.9%11.4%0.5%
January 202640785.7%8.8%0.0%
February 202634391.0%3.5%0.3%
March 202638083.2%8.7%2.4%
April 202637289.8%4.8%0.0%
May 202639185.7%6.6%0.3%
June 202640484.2%7.7%0.0%

What drove PDX to SEA delay minutes?

Airline was the largest recorded PDX-to-SEA delay category, accounting for 44.3% of 40,661 BTS-attributed delay minutes during July 2025–June 2026.

Airline44.3%
Late aircraft24.6%
National airspace19.4%
Weather11.5%
Security0.3%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.