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Flight Reliability

DL 4033 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4033 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

70%
Arrive within 15 minutes
22 min
Average arrival delay
1.1%
Cancelled
6 min early
Median arrival delay

Based on 624 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon63%(102 flights)
  • Tue70%(97 flights)
  • Wed72%(96 flights)
  • Thu73%(94 flights)
  • Fri69%(94 flights)
  • Sat77%(31 flights)
  • Sun71%(97 flights)
On-time by departure window
  • 9 AM–12 PM64%(14 flights)
  • 12–3 PM72%(288 flights)
  • 3–6 PM69%(309 flights)
On-time trend by month
66%
May

Jun 64% → May 66% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202564%58
July 202558%59
August 202571%62
September 202593%40
October 202583%52
November 202586%42
December 202569%52
January 202646%48
February 202666%44
March 202664%53
April 202684%51
May 202666%50
Departures on time
71%
Diverted
1.0%
Flights flown
611
Months covered
12

Keep nerding

Based on 624 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.