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Flight Reliability

F9 4206 · Frontier Airlines

Ontario → Las Vegas (ONT–LAS)

79
Usually Fine
WanderNerd Reliability Score
73%
Arrive within 15 minutes
13 min
Average arrival delay
0%
Cancelled
7 min early
Median arrival delay

Based on 121 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

F9 4206 departing between 9 PM–12 AM arrived on time 75% of the time, versus 65% between 6–9 PM.

Thursdays have been rough.

F9 4206 arrived on time 85% of the time on Sundays and just 60% on Thursdays. That gap is worth planning around.

A bit behind the ONT–LAS route.

F9 4206 arrived on time 73% of the time, versus 79% across the ONT–LAS route.

It basically never cancels.

Out of 121 scheduled flights, only 0.0% were cancelled.

The breakdown

On-time by weekday
  • Mon75%(24 flights)
  • Tue—(6 flights)
  • Wed80%(15 flights)
  • Thu60%(10 flights)
  • Fri61%(28 flights)
  • Sat75%(12 flights)
  • Sun85%(26 flights)
On-time by departure window
  • 3–6 PM—(5 flights)
  • 6–9 PM65%(40 flights)
  • 9 PM–12 AM75%(76 flights)
On-time trend by month
73%
May

Sep 77% → May 73% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
September 202577%13
October 202592%13
January 202679%14
February 202688%16
March 202643%14
April 202663%27
May 202673%11
Departures on time
77%
Diverted
0%
Flights flown
121
Months covered
9

Same route, other flights

Keep nerding

Based on 121 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.