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Flight Reliability

DL 1235 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1235 moved between routes during this period. Numbers below combine all of them, so treat them as background, not a verdict. For a cleaner answer, check the route you are actually flying.

Combined across all its routes

78%
Arrive within 15 minutes
8 min
Average arrival delay
1.2%
Cancelled
3 min early
Median arrival delay

Based on 408 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon79%(61 flights)
  • Tue84%(61 flights)
  • Wed75%(61 flights)
  • Thu81%(63 flights)
  • Fri79%(57 flights)
  • Sat78%(40 flights)
  • Sun69%(58 flights)
On-time by departure window
  • 12–3 PM76%(174 flights)
  • 3–6 PM77%(120 flights)
  • 6–9 PM80%(96 flights)
  • 9 PM–12 AM91%(11 flights)
On-time trend by month
69%
May

Jun 63% → May 69% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%27
July 202554%26
August 202579%29
September 202592%24
October 202579%29
November 202589%27
December 202577%26
January 202693%14
February 202673%41
March 202685%54
April 202686%50
May 202669%54
Departures on time
78%
Diverted
0.5%
Flights flown
401
Months covered
12

Keep nerding

Based on 408 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.