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Flight Reliability

F9 2231 · Frontier Airlines

Las Vegas → Ontario (LAS–ONT)

78
Usually Fine
WanderNerd Reliability Score
77%
Arrive within 15 minutes
6 min
Average arrival delay
1.7%
Cancelled
12 min early
Median arrival delay

Based on 290 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

F9 2231 departing between 3–6 PM arrived on time 84% of the time, versus 77% between 6–9 PM.

Mondays have been rough.

F9 2231 arrived on time 88% of the time on Wednesdays and just 63% on Mondays. That gap is worth planning around.

A bit ahead of the Frontier Airlines network.

F9 2231 arrived on time 77% of the time, versus 73% across the Frontier Airlines network.

Recent months have been rougher.

F9 2231 arrived on time 73% of the time over the last three months in the data, compared with 83% in the three months before that.

The breakdown

On-time by weekday
  • Mon63%(41 flights)
  • Tue85%(34 flights)
  • Wed88%(41 flights)
  • Thu76%(42 flights)
  • Fri64%(42 flights)
  • Sat84%(45 flights)
  • Sun80%(40 flights)
On-time by departure window
  • 12–3 PM—(2 flights)
  • 3–6 PM84%(31 flights)
  • 6–9 PM77%(247 flights)
  • 9 PM–12 AM—(5 flights)
On-time trend by month
77%
May

Jun 72% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202572%29
July 202581%31
August 202583%24
September 202571%28
October 202571%31
November 202583%30
December 202577%30
January 202685%20
February 202687%15
March 202670%10
April 202671%24
May 202677%13
Departures on time
74%
Diverted
0%
Flights flown
285
Months covered
12

Same route, other flights

Keep nerding

Based on 290 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.