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Flight Reliability

F9 3989 · Frontier Airlines

Detroit → Dallas–Fort Worth (DTW–DFW)

52
A Little Dicey
WanderNerd Reliability Score
64%
Arrive within 15 minutes
26 min
Average arrival delay
2.9%
Cancelled
2 min early
Median arrival delay

Based on 105 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

F9 3989 departing between 12–3 PM arrived on time 77% of the time, versus 53% between 6–9 PM.

Mondays have been rough.

F9 3989 arrived on time 77% of the time on Fridays and just 45% on Mondays. That gap is worth planning around.

Lagging the DTW–DFW route.

F9 3989 arrived on time 64% of the time, versus 77% across the DTW–DFW route.

Lagging the Frontier Airlines network.

F9 3989 arrived on time 64% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon45%(20 flights)
  • Tue—(3 flights)
  • Wed—(3 flights)
  • Thu74%(27 flights)
  • Fri77%(17 flights)
  • Sat—(2 flights)
  • Sun60%(30 flights)
On-time by departure window
  • 6–9 AM—(9 flights)
  • 9 AM–12 PM63%(16 flights)
  • 12–3 PM77%(34 flights)
  • 3–6 PM—(7 flights)
  • 6–9 PM53%(32 flights)
  • 9 PM–12 AM—(4 flights)
On-time trend by month
62%
Apr

Oct 85% → Apr 62% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
October 202585%13
November 202560%20
December 202539%13
March 202677%13
April 202662%13
Departures on time
71%
Diverted
0%
Flights flown
102
Months covered
10

Same route, other flights

Keep nerding

Based on 105 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.