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

Washington, DC (IAD) to Chicago, IL (ORD) flight delay odds

74.4% of 2,054 official scheduled IAD-to-ORD flights arrived on time; 15.1% arrived at least 30 minutes late and 0.8% 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 SIGNALGenerally reliable
74.4%arrived on time
15.1%30+ min late
0.8%cancelled
2,054scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late8.1%all scheduled flights
120+ minutes late4.0%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+12.0 mincompleted flights

Which departure time was most reliable for IAD to ORD?

Among qualifying IAD-to-ORD departure window results, Late morning had the highest on-time rate: 91.7% of 96 flights. Evening was lowest at 46.1% across 432 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning65587.8%5.2%0.5%
Late morning9691.7%6.2%0.0%
Afternoon50876.0%15.6%0.6%
Evening43246.1%31.9%0.9%
Night36377.4%14.6%1.9%

Which weekday was most reliable for IAD to ORD?

Among qualifying IAD-to-ORD weekday results, Tuesday had the highest on-time rate: 78.0% of 300 flights. Sunday was lowest at 71.2% across 292 flights.

DayFlightsOn time30+ minCancelled
Monday29674.7%13.2%1.4%
Tuesday30078.0%13.0%0.7%
Wednesday29073.8%16.9%0.0%
Thursday29171.8%15.5%0.3%
Friday29775.4%14.5%0.7%
Saturday28876.0%14.2%1.4%
Sunday29271.2%18.5%1.4%

Which airline was most reliable for IAD to ORD?

Only United Airlines met the IAD-to-ORD airline threshold: 74.4% of 2,054 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
United Airlines2,05474.4%15.1%0.8%

Which month was most reliable for IAD to ORD?

Among qualifying IAD-to-ORD month results, June 2026 had the highest on-time rate: 79.0% of 210 flights. July 2025 was lowest at 62.7% across 185 flights.

MonthFlightsOn time30+ minCancelled
July 202518562.7%28.1%1.6%
August 202519674.5%16.3%1.0%
September 202520378.8%10.8%0.0%
October 202517672.7%13.1%0.0%
November 202515176.2%13.9%2.0%
December 202514675.3%11.0%0.0%
January 202612970.5%12.4%3.1%
February 202611275.0%8.9%0.0%
March 202614874.3%16.9%2.7%
April 202618175.7%16.6%0.0%
May 202621776.5%14.3%0.0%
June 202621079.0%15.2%0.5%

What drove IAD to ORD delay minutes?

National airspace was the largest recorded IAD-to-ORD delay category, accounting for 57.1% of 36,839 BTS-attributed delay minutes during July 2025–June 2026.

Airline17.5%
Late aircraft18.2%
National airspace57.1%
Weather7.2%
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.