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Flight Reliability

F9 3990 · Frontier Airlines

Dallas–Fort Worth → Detroit (DFW–DTW)

89
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
3 min
Average arrival delay
0.8%
Cancelled
9 min early
Median arrival delay

Based on 130 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

F9 3990 departing between 6–9 AM arrived on time 91% of the time, versus 65% between 12–3 PM.

Mondays have been rough.

F9 3990 arrived on time 96% of the time on Fridays and just 73% on Mondays. That gap is worth planning around.

A bit ahead of the DFW–DTW route.

F9 3990 arrived on time 84% of the time, versus 77% across the DFW–DTW route.

Better than the Frontier Airlines network average.

F9 3990 arrived on time 84% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon73%(22 flights)
  • Tue—(6 flights)
  • Wed—(7 flights)
  • Thu75%(24 flights)
  • Fri96%(28 flights)
  • Sat—(9 flights)
  • Sun91%(33 flights)
On-time by departure window
  • 6–9 AM91%(70 flights)
  • 9 AM–12 PM79%(29 flights)
  • 12–3 PM65%(17 flights)
  • 3–6 PM77%(13 flights)
On-time trend by month
89%
May

Sep 92% → May 89% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
September 202592%13
December 202590%19
January 202675%12
March 202682%17
April 202673%15
May 202689%27
Departures on time
85%
Diverted
0%
Flights flown
129
Months covered
10

Same route, other flights

Keep nerding

Based on 130 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.