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Route Reliability

Chicago → Houston

ORD–IAH · 925 miles · Chicago O'Hare International Airport to George Bush Intercontinental Airport

77
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
9 min
Average arrival delay
1.4%
Cancelled
6,059
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.United Airlines79%3,973 flights
  2. 2.Frontier Airlines77%234 flights
  3. 3.American Airlines68%1,506 flights
  4. 4.Spirit Airlines63%346 flights

What the data says

Morning flights do better here.

ORD–IAH flights departing between 3–6 AM arrived on time 91% of the time, versus 62% between 6–9 PM.

Sunday scaries are real for this one.

ORD–IAH flights arrived on time 80% of the time on Tuesdays. On Sundays: 70%.

United Airlines has a clear lead on this route.

United Airlines arrived on time 79% of the time on this route; Spirit Airlines managed 63%.

Recent months have been rougher.

ORD–IAH flights arrived on time 73% of the time over the last three months in the data, compared with 80% in the three months before that.

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
  • Mon75%(862 flights)
  • Tue80%(801 flights)
  • Wed78%(812 flights)
  • Thu77%(880 flights)
  • Fri71%(890 flights)
  • Sat75%(797 flights)
  • Sun70%(917 flights)
On-time by departure window
  • 12–3 AM—(1 flights)
  • 3–6 AM91%(194 flights)
  • 6–9 AM87%(1220 flights)
  • 9 AM–12 PM81%(853 flights)
  • 12–3 PM75%(1172 flights)
  • 3–6 PM70%(1032 flights)
  • 6–9 PM62%(1010 flights)
  • 9 PM–12 AM67%(477 flights)
On-time trend by month
75%
May

Jun 66% → May 75% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202566%499
July 202564%503
August 202573%520
September 202585%531
October 202579%516
November 202578%453
December 202574%509
January 202680%460
February 202686%431
March 202673%489
April 202671%512
May 202675%536

Same trip, other airports

Keep nerding

Based on 6,059 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.