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Route Reliability

Houston → Ontario

IAH–ONT · 1,334 miles · George Bush Intercontinental Airport to Ontario International Airport

80
Pretty Reliable
WanderNerd Reliability Score
74%
Arrive within 15 minutes
9 min
Average arrival delay
0.4%
Cancelled
517
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.United Airlines76%365 flights
  2. 2.Frontier Airlines72%152 flights

What the data says

Morning flights do better here.

IAH–ONT flights departing between 9 AM–12 PM arrived on time 100% of the time, versus 63% between 3–6 PM.

Monday is the weak spot.

IAH–ONT flights arrived on time 81% of the time on Tuesdays. On Mondays: 70%.

United Airlines has a slight edge here.

United Airlines arrived on time 76% of the time on this route; Frontier Airlines managed 72%.

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
  • Mon70%(96 flights)
  • Tue81%(57 flights)
  • Wed75%(59 flights)
  • Thu73%(70 flights)
  • Fri76%(102 flights)
  • Sat75%(56 flights)
  • Sun74%(74 flights)
On-time by departure window
  • 3–6 AM—(7 flights)
  • 6–9 AM85%(20 flights)
  • 9 AM–12 PM100%(12 flights)
  • 12–3 PM77%(31 flights)
  • 3–6 PM63%(80 flights)
  • 6–9 PM75%(364 flights)
On-time trend by month
85%
May

Jun 34% → May 85% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202534%38
July 202559%39
August 202564%39
September 202581%43
October 202569%48
November 202570%47
December 202577%43
January 202690%41
February 202692%36
March 202680%40
April 202685%39
May 202685%61

Same trip, other airports

Keep nerding

Based on 517 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.