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

Chicago, IL (ORD) to Portland, OR (PDX) flight delay odds

68.8% of 2,761 official scheduled ORD-to-PDX flights arrived on time; 18.8% arrived at least 30 minutes late and 0.9% 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 SIGNALVariable
68.8%arrived on time
18.8%30+ min late
0.9%cancelled
2,761scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late9.4%all scheduled flights
120+ minutes late3.8%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+13.7 mincompleted flights

Which departure time was most reliable for ORD to PDX?

Among qualifying ORD-to-PDX departure window results, Early morning had the highest on-time rate: 81.3% of 475 flights. Night was lowest at 43.0% across 200 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning47581.3%10.1%0.6%
Late morning45978.2%12.2%0.4%
Afternoon1,08769.4%18.0%0.5%
Evening54058.1%25.9%1.5%
Night20043.0%39.5%3.0%

Which weekday was most reliable for ORD to PDX?

Among qualifying ORD-to-PDX weekday results, Tuesday had the highest on-time rate: 72.8% of 386 flights. Sunday was lowest at 63.9% across 404 flights.

DayFlightsOn time30+ minCancelled
Monday41268.9%18.7%0.7%
Tuesday38672.8%15.5%0.3%
Wednesday36668.3%18.3%0.0%
Thursday40470.5%18.1%1.7%
Friday40766.8%19.7%1.0%
Saturday38270.4%19.4%0.8%
Sunday40463.9%21.8%1.5%

Which airline was most reliable for ORD to PDX?

Among qualifying ORD-to-PDX airline results, United Airlines had the highest on-time rate: 72.1% of 1,394 flights. American Airlines was lowest at 61.6% across 861 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines1,39472.1%16.0%0.4%
American Airlines86161.6%26.4%1.4%
Alaska Airlines50671.9%13.6%1.2%

Which month was most reliable for ORD to PDX?

Among qualifying ORD-to-PDX month results, September 2025 had the highest on-time rate: 85.2% of 257 flights. December 2025 was lowest at 56.1% across 164 flights.

MonthFlightsOn time30+ minCancelled
July 202529570.5%20.7%1.4%
August 202529573.9%14.2%0.7%
September 202525785.2%7.0%0.0%
October 202526267.2%14.5%0.4%
November 202517468.4%19.0%2.3%
December 202516456.1%24.4%0.6%
January 202613971.9%12.2%1.4%
February 202614770.1%17.7%0.0%
March 202618158.0%26.0%2.2%
April 202624262.0%24.4%1.2%
May 202628472.9%18.3%0.0%
June 202632162.9%26.8%0.9%

What drove ORD to PDX delay minutes?

Late aircraft was the largest recorded ORD-to-PDX delay category, accounting for 48.1% of 52,652 BTS-attributed delay minutes during July 2025–June 2026.

Airline28.1%
Late aircraft48.1%
National airspace18.8%
Weather4.7%
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.