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Flight Reliability

F9 3999 · Frontier Airlines

Dallas–Fort Worth → San Francisco (DFW–SFO)

58
A Little Dicey
WanderNerd Reliability Score
65%
Arrive within 15 minutes
12 min
Average arrival delay
3.4%
Cancelled
0 min
Median arrival delay

Based on 174 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

F9 3999 departing between 6–9 AM arrived on time 92% of the time, versus 57% between 6–9 PM.

Sunday scaries are real for this one.

F9 3999 arrived on time 74% of the time on Fridays and just 50% on Sundays. That gap is worth planning around.

Lagging the Frontier Airlines network.

F9 3999 arrived on time 65% of the time, versus 73% across the Frontier Airlines network.

Keep a backup plan handy.

F9 3999 was cancelled 3.4% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon63%(30 flights)
  • Tue—(6 flights)
  • Wed67%(15 flights)
  • Thu65%(34 flights)
  • Fri74%(38 flights)
  • Sat—(9 flights)
  • Sun50%(36 flights)
On-time by departure window
  • 6–9 AM92%(13 flights)
  • 9 AM–12 PM—(9 flights)
  • 12–3 PM78%(37 flights)
  • 3–6 PM—(1 flights)
  • 6–9 PM57%(108 flights)
On-time trend by month
54%
May

Jun 56% → May 54% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202556%18
July 202559%17
August 202575%16
September 202544%16
October 202571%17
November 202572%18
December 202580%10
May 202654%28
Departures on time
67%
Diverted
0%
Flights flown
168
Months covered
12

Same route, other flights

Keep nerding

Based on 174 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.