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Flight Reliability

F9 1949 · Frontier Airlines

Atlanta → San Francisco (ATL–SFO)

65
Usually Fine
WanderNerd Reliability Score
67%
Arrive within 15 minutes
19 min
Average arrival delay
1.4%
Cancelled
0 min
Median arrival delay

Based on 291 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

F9 1949 departing between 12–3 PM arrived on time 86% of the time, versus 58% between 6–9 PM.

Sunday scaries are real for this one.

F9 1949 arrived on time 81% of the time on Thursdays and just 49% on Sundays. That gap is worth planning around.

A bit behind the ATL–SFO route.

F9 1949 arrived on time 67% of the time, versus 73% across the ATL–SFO route.

A bit behind the Frontier Airlines network.

F9 1949 arrived on time 67% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon73%(48 flights)
  • Tue66%(29 flights)
  • Wed77%(30 flights)
  • Thu81%(47 flights)
  • Fri57%(46 flights)
  • Sat69%(42 flights)
  • Sun49%(45 flights)
On-time by departure window
  • 9 AM–12 PM78%(36 flights)
  • 12–3 PM86%(21 flights)
  • 3–6 PM77%(65 flights)
  • 6–9 PM58%(165 flights)
On-time trend by month
65%
May

Jun 45% → May 65% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202545%29
July 202565%31
August 202541%27
September 202581%21
October 202557%21
November 202571%24
December 202574%23
January 202681%16
February 202663%16
March 202683%29
April 202683%30
May 202665%20
Departures on time
58%
Diverted
0%
Flights flown
287
Months covered
12

Same route, other flights

Keep nerding

Based on 291 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.