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

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

73.5% of 2,051 official scheduled ORD-to-IAD flights arrived on time; 16.2% 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 SIGNALGenerally reliable
73.5%arrived on time
16.2%30+ min late
0.7%cancelled
2,051scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late9.6%all scheduled flights
120+ minutes late4.5%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+13.7 mincompleted flights

Which departure time was most reliable for ORD to IAD?

Among qualifying ORD-to-IAD departure window results, Early morning had the highest on-time rate: 87.0% of 407 flights. Evening was lowest at 58.5% across 366 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning40787.0%8.4%0.7%
Late morning21186.3%9.0%0.0%
Afternoon78471.8%15.1%0.5%
Evening36658.5%27.9%0.8%
Night28368.9%20.8%1.4%

Which weekday was most reliable for ORD to IAD?

Among qualifying ORD-to-IAD weekday results, Tuesday had the highest on-time rate: 77.4% of 296 flights. Sunday was lowest at 67.8% across 295 flights.

DayFlightsOn time30+ minCancelled
Monday29274.3%18.8%0.3%
Tuesday29677.4%13.2%0.7%
Wednesday29271.2%18.5%0.0%
Thursday29372.7%14.7%0.7%
Friday29475.2%16.3%0.3%
Saturday28976.1%14.2%1.0%
Sunday29567.8%17.6%1.7%

Which airline was most reliable for ORD to IAD?

Only United Airlines met the ORD-to-IAD airline threshold: 73.5% of 2,051 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
United Airlines2,05173.5%16.2%0.7%

Which month was most reliable for ORD to IAD?

Among qualifying ORD-to-IAD month results, June 2026 had the highest on-time rate: 82.9% of 210 flights. July 2025 was lowest at 56.8% across 185 flights.

MonthFlightsOn time30+ minCancelled
July 202518556.8%30.8%1.6%
August 202519670.4%17.9%0.5%
September 202520182.1%10.4%0.0%
October 202517774.6%15.3%0.0%
November 202515169.5%17.9%2.0%
December 202514569.7%17.9%0.0%
January 202612972.9%13.2%3.1%
February 202611279.5%12.5%0.0%
March 202614864.9%21.6%1.4%
April 202618176.8%16.0%0.0%
May 202621678.7%11.1%0.0%
June 202621082.9%11.0%0.5%

What drove ORD to IAD delay minutes?

Late aircraft was the largest recorded ORD-to-IAD delay category, accounting for 36.2% of 38,327 BTS-attributed delay minutes during July 2025–June 2026.

Airline33.8%
Late aircraft36.2%
National airspace23.6%
Weather6.5%
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.