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

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

87.8% of 687 official scheduled PDX-to-MDW flights arrived on time; 5.4% arrived at least 30 minutes late and 0.7% 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
87.8%arrived on time
5.4%30+ min late
0.7%cancelled
687scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late1.6%all scheduled flights
120+ minutes late0.7%all scheduled flights
Diverted0.7%did not reach as scheduled
Average arrival-3.1 mincompleted flights

Which departure time was most reliable for PDX to MDW?

Among qualifying PDX-to-MDW departure window results, Early morning had the highest on-time rate: 92.4% of 408 flights. Afternoon was lowest at 72.4% across 105 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning40892.4%4.2%0.7%
Late morning5576.4%7.3%0.0%
Afternoon10572.4%11.4%0.0%
Night11990.8%3.4%1.7%

Which weekday was most reliable for PDX to MDW?

Among qualifying PDX-to-MDW weekday results, Wednesday had the highest on-time rate: 92.2% of 103 flights. Thursday was lowest at 84.6% across 104 flights.

DayFlightsOn time30+ minCancelled
Monday10387.4%7.8%1.0%
Tuesday10689.6%2.8%0.0%
Wednesday10392.2%2.9%0.0%
Thursday10484.6%5.8%1.0%
Friday10285.3%7.8%0.0%
Saturday8789.7%4.6%2.3%
Sunday8285.4%6.1%1.2%

Which airline was most reliable for PDX to MDW?

Only Southwest Airlines met the PDX-to-MDW airline threshold: 87.8% of 687 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines68787.8%5.4%0.7%

Which month was most reliable for PDX to MDW?

Among qualifying PDX-to-MDW month results, February 2026 had the highest on-time rate: 96.4% of 28 flights. July 2025 was lowest at 76.1% across 88 flights.

MonthFlightsOn time30+ minCancelled
July 20258876.1%10.2%1.1%
August 20258491.7%6.0%0.0%
September 20258291.5%2.4%0.0%
October 20255483.3%7.4%0.0%
November 20253193.5%0.0%0.0%
December 20253183.9%9.7%0.0%
January 20263190.3%3.2%0.0%
February 20262896.4%0.0%0.0%
March 20265887.9%5.2%5.2%
April 20266095.0%0.0%0.0%
May 20266193.4%3.3%1.6%
June 20267981.0%10.1%0.0%

What drove PDX to MDW delay minutes?

Late aircraft was the largest recorded PDX-to-MDW delay category, accounting for 47.2% of 2,983 BTS-attributed delay minutes during July 2025–June 2026.

Airline27.3%
Late aircraft47.2%
National airspace22.2%
Weather2.3%
Security1.0%
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.