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Flight Reliability

DL 825 · Delta Air Lines

Atlanta → Las Vegas (ATL–LAS)86% of its flights flew this route. The rest (SAN–BOS) are included in these numbers.

59
A Little Dicey
WanderNerd Reliability Score
64%
Arrive within 15 minutes
17 min
Average arrival delay
1.9%
Cancelled
2 min
Median arrival delay

Based on 265 historical flights. Data through May 2026.

What the data says

6–9 PM has a slight edge.

Departures between 6–9 PM arrived on time 68% of the time, against 62% between 9 PM–12 AM.

Sunday scaries are real for this one.

DL 825 arrived on time 76% of the time on Saturdays and just 52% on Sundays. That gap is worth planning around.

Lagging the ATL–LAS route.

DL 825 arrived on time 64% of the time, versus 76% across the ATL–LAS route.

Well behind the Delta Air Lines network.

DL 825 arrived on time 64% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon70%(47 flights)
  • Tue68%(25 flights)
  • Wed73%(26 flights)
  • Thu61%(46 flights)
  • Fri57%(44 flights)
  • Sat76%(25 flights)
  • Sun52%(46 flights)
On-time by departure window
  • 6–9 PM68%(75 flights)
  • 9 PM–12 AM62%(184 flights)
On-time trend by month
71%
May

Jun 54% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202554%28
July 202557%30
August 202571%14
September 202558%12
October 202556%16
November 202571%14
December 202562%21
January 202677%22
February 202664%14
March 202663%27
April 202663%30
May 202671%31
Departures on time
68%
Diverted
0.4%
Flights flown
259
Months covered
12

Same route, other flights

Keep nerding

Based on 265 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.