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Flight Reliability

F9 2638 · Frontier Airlines

San Francisco → Phoenix (SFO–PHX)

25
Bring Snacks
WanderNerd Reliability Score
53%
Arrive within 15 minutes
41 min
Average arrival delay
5.1%
Cancelled
12 min
Median arrival delay

Based on 158 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

F9 2638 departing between 9 AM–12 PM arrived on time 73% of the time, versus 42% between 9 PM–12 AM.

Friday is doing you no favors.

F9 2638 arrived on time 88% of the time on Saturdays and just 35% on Fridays. That gap is worth planning around.

Well behind the SFO–PHX route.

F9 2638 arrived on time 53% of the time, versus 76% across the SFO–PHX route.

Well behind the Frontier Airlines network.

F9 2638 arrived on time 53% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon58%(33 flights)
  • Tue—(7 flights)
  • Wed—(5 flights)
  • Thu56%(25 flights)
  • Fri35%(34 flights)
  • Sat88%(16 flights)
  • Sun43%(30 flights)
On-time by departure window
  • 6–9 AM—(5 flights)
  • 9 AM–12 PM73%(15 flights)
  • 3–6 PM—(9 flights)
  • 6–9 PM47%(97 flights)
  • 9 PM–12 AM42%(24 flights)
On-time trend by month
69%
May

Jun 36% → May 69% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202536%14
July 202537%19
August 202553%15
September 202550%16
October 202530%10
November 202540%25
December 202583%12
February 202690%10
April 202660%10
May 202669%13
Departures on time
50%
Diverted
0%
Flights flown
150
Months covered
12

Same route, other flights

Keep nerding

Based on 158 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.