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

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

Historically, 76.1% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 2,766 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
76.1%arrived on time
12.4%30+ min late
1.0%cancelled
2,766scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.4%all scheduled flights
120+ minutes late3.0%all scheduled flights
Diverted0.7%did not reach as scheduled
Average arrival+7.8 mincompleted flights

When is this route most reliable?

The same route can behave differently through the day. These are scheduled departure windows, not actual departure times. Small time windows with fewer than 40 flights are withheld.

Departure windowFlightsOn time30+ minCancelled
Early morning93881.0%7.9%0.9%
Late morning58674.4%14.2%0.5%
Afternoon46862.4%20.7%0.9%
Evening5569.1%14.5%0.0%
Night71980.5%11.4%1.9%

Weekday comparison

Day-of-week results use at least 30 scheduled flights per row. Look for broad patterns, not tiny percentage differences.

DayFlightsOn time30+ minCancelled
Monday39075.4%12.1%1.3%
Tuesday38877.6%9.5%0.5%
Wednesday37976.8%12.9%0.0%
Thursday41375.8%12.3%1.7%
Friday40777.6%12.8%1.2%
Saturday37978.4%12.7%1.1%
Sunday41071.5%14.6%1.5%

Airline comparison

Marketing-carrier results make codeshare flights easier to compare as travelers buy them. Dedicated route-airline reports require at least 160 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines1,39379.6%10.7%0.6%
American Airlines86372.1%17.3%1.5%
Alaska Airlines51073.3%9.0%1.4%

Monthly trend

Month-by-month results show whether a twelve-month average hides an unusual period.

MonthFlightsOn time30+ minCancelled
July 202529760.9%22.6%1.7%
August 202529474.1%8.8%0.7%
September 202525574.9%10.2%0.0%
October 202526477.7%7.2%0.4%
November 202517479.9%10.9%2.9%
December 202516477.4%13.4%0.6%
January 202614082.9%10.7%1.4%
February 202614889.2%7.4%0.0%
March 202618182.9%11.0%2.2%
April 202624271.5%16.9%1.7%
May 202628584.2%7.4%0.0%
June 202632272.4%17.7%1.6%

What drove reported delay minutes?

BTS cause minutes are reported for qualifying delayed flights. These shares describe recorded delay minutes—not the chance that a particular cause will affect your next flight.

Airline37.3%
Late aircraft27.5%
National airspace33.7%
Weather1.5%
Security0.0%
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.