Skip to content
WanderNerd
Check a flight

Route Reliability

Ontario → Houston

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

90
Nerd Approved
WanderNerd Reliability Score
86%
Arrive within 15 minutes
9 min
Average arrival delay
0.6%
Cancelled
516
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.United Airlines90%365 flights
  2. 2.Frontier Airlines75%151 flights

What the data says

Morning flights do better here.

ONT–IAH flights departing between 3–6 AM arrived on time 100% of the time, versus 74% between 6–9 PM.

Monday is the weak spot.

ONT–IAH flights arrived on time 91% of the time on Tuesdays. On Mondays: 77%.

United Airlines runs this route best.

United Airlines arrived on time 90% of the time on this route; Frontier Airlines managed 75%.

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
  • Mon77%(96 flights)
  • Tue91%(57 flights)
  • Wed90%(59 flights)
  • Thu89%(70 flights)
  • Fri82%(100 flights)
  • Sat91%(55 flights)
  • Sun87%(75 flights)
On-time by departure window
  • 3–6 AM100%(11 flights)
  • 6–9 AM89%(363 flights)
  • 12–3 PM76%(83 flights)
  • 3–6 PM75%(24 flights)
  • 6–9 PM74%(31 flights)
On-time trend by month
84%
May

Jun 76% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202576%37
July 202582%38
August 202575%40
September 202584%43
October 202590%48
November 202592%47
December 202580%44
January 202688%41
February 2026100%36
March 202684%38
April 202695%39
May 202684%61

Same trip, other airports

Keep nerding

Based on 516 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.