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Route Reliability

Washington → Chicago

IAD–ORD · 588 miles · Washington Dulles International Airport to Chicago O'Hare International Airport

79
Usually Fine
WanderNerd Reliability Score
76%
Arrive within 15 minutes
12 min
Average arrival delay
0.8%
Cancelled
2,024
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 76% of the time across 2,024 flights. No comparison to make.

What the data says

Morning flights do better here.

IAD–ORD flights departing between 6–9 AM arrived on time 89% of the time, versus 43% between 6–9 PM.

Tuesday comes out ahead.

A small edge: 79% on time on Tuesdays against 73% on Thursdays.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon76%(285 flights)
  • Tue79%(286 flights)
  • Wed75%(286 flights)
  • Thu73%(286 flights)
  • Fri75%(291 flights)
  • Sat77%(279 flights)
  • Sun74%(290 flights)
On-time by departure window
  • 6–9 AM89%(652 flights)
  • 9 AM–12 PM88%(66 flights)
  • 12–3 PM81%(361 flights)
  • 3–6 PM54%(501 flights)
  • 6–9 PM43%(67 flights)
  • 9 PM–12 AM80%(356 flights)
On-time trend by month
78%
May

Jun 76% → May 78% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202576%180
July 202564%182
August 202577%192
September 202579%203
October 202574%176
November 202578%148
December 202577%146
January 202673%125
February 202678%112
March 202678%142
April 202676%181
May 202678%216

Same trip, other airports

Keep nerding

Based on 2,024 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.