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Flight Reliability

AA 3937 · American Airlines

Dallas–Fort Worth → BIL (DFW–BIL)

78
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
7 min
Average arrival delay
0.9%
Cancelled
4 min early
Median arrival delay

Based on 326 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

AA 3937 departing between 6–9 PM arrived on time 76% of the time, versus 64% between 9 PM–12 AM.

Thursdays have been rough.

AA 3937 arrived on time 84% of the time on Wednesdays and just 67% on Thursdays. That gap is worth planning around.

A bit behind the DFW–BIL route.

AA 3937 arrived on time 75% of the time, versus 79% across the DFW–BIL route.

Slipping a little lately.

AA 3937 arrived on time 81% of the time over the last three months in the data, compared with 85% in the three months before that.

The breakdown

On-time by weekday
  • Mon76%(45 flights)
  • Tue80%(46 flights)
  • Wed84%(45 flights)
  • Thu67%(45 flights)
  • Fri74%(46 flights)
  • Sat77%(47 flights)
  • Sun69%(48 flights)
On-time by departure window
  • 3–6 PM—(1 flights)
  • 6–9 PM76%(310 flights)
  • 9 PM–12 AM64%(11 flights)
On-time trend by month
81%
May

Jun 63% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%30
July 202557%30
August 202567%30
September 202579%29
October 202565%31
November 202586%29
December 202587%30
February 202682%17
March 202687%31
April 202677%30
May 202681%31
Departures on time
81%
Diverted
0.3%
Flights flown
322
Months covered
12

Same route, other flights

Keep nerding

Based on 326 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.