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Flight Reliability

F9 3121 · Frontier Airlines

Charlotte → Houston (CLT–IAH)

62
A Little Dicey
WanderNerd Reliability Score
74%
Arrive within 15 minutes
6 min
Average arrival delay
4.9%
Cancelled
7 min early
Median arrival delay

Based on 185 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

F9 3121 departing between 6–9 AM arrived on time 86% of the time, versus 66% between 3–6 PM.

Skip Saturday if you can.

F9 3121 arrived on time 82% of the time on Thursdays. On Saturdays: 70%.

A bit behind the CLT–IAH route.

F9 3121 arrived on time 74% of the time, versus 79% across the CLT–IAH route.

Keep a backup plan handy.

F9 3121 was cancelled 4.9% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon70%(50 flights)
  • Tue—(5 flights)
  • Wed—(1 flights)
  • Thu82%(27 flights)
  • Fri72%(50 flights)
  • Sat70%(10 flights)
  • Sun76%(33 flights)
On-time by departure window
  • 6–9 AM86%(28 flights)
  • 9 AM–12 PM77%(47 flights)
  • 12–3 PM82%(11 flights)
  • 3–6 PM66%(82 flights)
  • 6–9 PM—(8 flights)
On-time trend by month
63%
May

Aug 82% → May 63% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
August 202582%11
September 202588%16
October 202586%14
November 202590%19
December 202567%15
January 202687%15
February 202684%19
March 202674%19
April 202638%16
May 202663%16
Departures on time
73%
Diverted
0%
Flights flown
176
Months covered
12

Same route, other flights

Keep nerding

Based on 185 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.