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

Columbus, OH (CMH) to Washington, DC (IAD) flight delay odds

82.9% of 1,061 official scheduled CMH-to-IAD flights arrived on time; 8.8% arrived at least 30 minutes late and 1.6% 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
82.9%arrived on time
8.8%30+ min late
1.6%cancelled
1,061scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.6%all scheduled flights
120+ minutes late2.9%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+5.3 mincompleted flights

Which departure time was most reliable for CMH to IAD?

Among qualifying CMH-to-IAD departure window results, Early morning had the highest on-time rate: 93.1% of 348 flights. Afternoon was lowest at 71.1% across 239 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning34893.1%3.4%1.1%
Late morning19885.9%7.6%1.5%
Afternoon23971.1%11.7%1.3%
Evening27678.3%13.8%2.5%

Which weekday was most reliable for CMH to IAD?

Among qualifying CMH-to-IAD weekday results, Saturday had the highest on-time rate: 91.4% of 105 flights. Monday was lowest at 74.4% across 160 flights.

DayFlightsOn time30+ minCancelled
Monday16074.4%11.2%1.2%
Tuesday15982.4%8.2%3.1%
Wednesday16287.0%9.3%1.2%
Thursday16388.3%4.9%1.2%
Friday16181.4%9.9%0.6%
Saturday10591.4%5.7%0.0%
Sunday15178.1%11.3%3.3%

Which airline was most reliable for CMH to IAD?

Among qualifying CMH-to-IAD airline results, Republic Airways had the highest on-time rate: 85.1% of 673 flights. United Airlines was lowest at 79.1% across 388 flights.

AirlineFlightsOn time30+ minCancelled
Republic Airways67385.1%7.1%2.1%
United Airlines38879.1%11.6%0.8%

Which month was most reliable for CMH to IAD?

Among qualifying CMH-to-IAD month results, April 2026 had the highest on-time rate: 95.3% of 85 flights. July 2025 was lowest at 67.1% across 85 flights.

MonthFlightsOn time30+ minCancelled
July 20258567.1%16.5%9.4%
August 202510980.7%6.4%0.9%
September 202513691.2%2.9%0.0%
October 20259783.5%6.2%0.0%
November 20256083.3%11.7%0.0%
December 20257675.0%15.8%0.0%
January 20267986.1%6.3%5.1%
February 202610482.7%9.6%1.9%
March 202611681.0%12.9%0.9%
April 20268595.3%3.5%0.0%
May 20266979.7%7.2%1.4%
June 20264586.7%11.1%0.0%

What drove CMH to IAD delay minutes?

Late aircraft was the largest recorded CMH-to-IAD delay category, accounting for 43.0% of 13,026 BTS-attributed delay minutes during July 2025–June 2026.

Airline37.6%
Late aircraft43.0%
National airspace15.4%
Weather4.0%
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.