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

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

61.1% of 686 official scheduled MDW-to-PDX flights arrived on time; 21.4% 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 SIGNALVariable
61.1%arrived on time
21.4%30+ min late
0.7%cancelled
686scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late10.2%all scheduled flights
120+ minutes late3.8%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+18.1 mincompleted flights

Which departure time was most reliable for MDW to PDX?

Among qualifying MDW-to-PDX departure window results, Early morning had the highest on-time rate: 73.3% of 120 flights. Night was lowest at 44.6% across 148 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning12073.3%10.8%0.0%
Late morning13672.1%14.0%0.7%
Afternoon16261.7%14.8%0.6%
Evening12055.8%31.7%0.0%
Night14844.6%35.8%2.0%

Which weekday was most reliable for MDW to PDX?

Among qualifying MDW-to-PDX weekday results, Saturday had the highest on-time rate: 70.1% of 87 flights. Friday was lowest at 52.0% across 102 flights.

DayFlightsOn time30+ minCancelled
Monday10361.2%24.3%0.0%
Tuesday10662.3%21.7%0.0%
Wednesday10365.0%16.5%0.0%
Thursday10458.7%20.2%1.9%
Friday10252.0%23.5%1.0%
Saturday8770.1%14.9%1.1%
Sunday8159.3%29.6%1.2%

Which airline was most reliable for MDW to PDX?

Only Southwest Airlines met the MDW-to-PDX airline threshold: 61.1% of 686 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines68661.1%21.4%0.7%

Which month was most reliable for MDW to PDX?

Among qualifying MDW-to-PDX month results, September 2025 had the highest on-time rate: 81.7% of 82 flights. December 2025 was lowest at 29.0% across 31 flights.

MonthFlightsOn time30+ minCancelled
July 20258861.4%26.1%0.0%
August 20258464.3%15.5%0.0%
September 20258281.7%8.5%0.0%
October 20255477.8%7.4%0.0%
November 20253066.7%13.3%3.3%
December 20253129.0%29.0%0.0%
January 20263177.4%9.7%0.0%
February 20262860.7%17.9%0.0%
March 20265836.2%46.6%3.4%
April 20266058.3%21.7%1.7%
May 20266163.9%19.7%1.6%
June 20267946.8%34.2%0.0%

What drove MDW to PDX delay minutes?

Late aircraft was the largest recorded MDW-to-PDX delay category, accounting for 39.7% of 13,797 BTS-attributed delay minutes during July 2025–June 2026.

Airline33.6%
Late aircraft39.7%
National airspace20.3%
Weather5.7%
Security0.7%
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.