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Flight Reliability

F9 4625 · Frontier Airlines

Memphis → Denver (MEM–DEN)

75
Usually Fine
WanderNerd Reliability Score
72%
Arrive within 15 minutes
13 min
Average arrival delay
0.8%
Cancelled
3 min early
Median arrival delay

Based on 129 historical flights. Data through May 2026.

What the data says

6–9 PM has a slight edge.

Departures between 6–9 PM arrived on time 74% of the time, against 68% between 3–6 PM.

Thursdays have been rough.

F9 4625 arrived on time 93% of the time on Fridays and just 59% on Thursdays. That gap is worth planning around.

Lagging the MEM–DEN route.

F9 4625 arrived on time 72% of the time, versus 79% across the MEM–DEN route.

Slipping a little lately.

F9 4625 arrived on time 82% of the time over the last three months in the data, compared with 85% in the three months before that.

The breakdown

On-time by weekday
  • Mon89%(18 flights)
  • Tue—(2 flights)
  • Wed—(2 flights)
  • Thu59%(44 flights)
  • Fri93%(15 flights)
  • Sat—(0 flights)
  • Sun70%(47 flights)
On-time by departure window
  • 9 AM–12 PM—(1 flights)
  • 12–3 PM—(5 flights)
  • 3–6 PM68%(22 flights)
  • 6–9 PM74%(100 flights)
On-time trend by month
100%
May

Aug 60% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
August 202560%10
October 202583%12
November 2025100%13
December 202573%11
February 202685%13
March 202662%13
May 2026100%11
Departures on time
74%
Diverted
0%
Flights flown
128
Months covered
12

Same route, other flights

Keep nerding

Based on 129 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.