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Flight Reliability

F9 3131 · Frontier Airlines

Houston → Ontario (IAH–ONT)

77
Usually Fine
WanderNerd Reliability Score
72%
Arrive within 15 minutes
7 min
Average arrival delay
0.7%
Cancelled
6 min early
Median arrival delay

Based on 152 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

F9 3131 departing between 9 AM–12 PM arrived on time 100% of the time, versus 61% between 3–6 PM.

Mondays have been rough.

F9 3131 arrived on time 83% of the time on Thursdays and just 59% on Mondays. That gap is worth planning around.

The breakdown

On-time by weekday
  • Mon59%(44 flights)
  • Tue—(5 flights)
  • Wed—(7 flights)
  • Thu83%(18 flights)
  • Fri70%(50 flights)
  • Sat—(4 flights)
  • Sun83%(23 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%(30 flights)
  • 3–6 PM61%(76 flights)
  • 6–9 PM—(6 flights)
On-time trend by month
87%
May

Sep 77% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
September 202577%13
October 202571%17
November 202577%17
December 202562%13
January 202680%10
May 202687%30
Departures on time
70%
Diverted
0%
Flights flown
151
Months covered
12

Same route, other flights

Keep nerding

Based on 152 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.