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Flight Reliability

F9 3978 · Frontier Airlines

Las Vegas → Dallas–Fort Worth (LAS–DFW)

73
Usually Fine
WanderNerd Reliability Score
80%
Arrive within 15 minutes
10 min
Average arrival delay
3.4%
Cancelled
9 min early
Median arrival delay

Based on 268 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

F9 3978 departing between 6–9 AM arrived on time 84% of the time, versus 75% between 12–3 PM.

Mondays have been rough.

F9 3978 arrived on time 87% of the time on Wednesdays and just 70% on Mondays. That gap is worth planning around.

Better than the Frontier Airlines network average.

F9 3978 arrived on time 80% of the time, versus 73% across the Frontier Airlines network.

Keep a backup plan handy.

F9 3978 was cancelled 3.4% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon70%(40 flights)
  • Tue83%(29 flights)
  • Wed87%(30 flights)
  • Thu84%(37 flights)
  • Fri85%(47 flights)
  • Sat80%(35 flights)
  • Sun75%(40 flights)
On-time by departure window
  • 6–9 AM84%(107 flights)
  • 9 AM–12 PM80%(61 flights)
  • 12–3 PM75%(12 flights)
  • 3–6 PM—(4 flights)
  • 6–9 PM77%(74 flights)
On-time trend by month
82%
May

Jun 75% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202575%28
July 202572%29
August 202581%26
September 202571%14
October 202563%19
November 202571%17
December 2025100%19
January 202675%28
February 2026100%18
March 202689%27
April 202686%22
May 202682%11
Departures on time
82%
Diverted
0.4%
Flights flown
258
Months covered
12

Same route, other flights

Keep nerding

Based on 268 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.