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Flight Reliability

DL 1138 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1138 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

81%
Arrive within 15 minutes
17 min
Average arrival delay
1.2%
Cancelled
10 min early
Median arrival delay

Based on 333 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon81%(52 flights)
  • Tue88%(42 flights)
  • Wed84%(43 flights)
  • Thu80%(50 flights)
  • Fri90%(49 flights)
  • Sat67%(42 flights)
  • Sun76%(50 flights)
On-time by departure window
  • 6–9 AM80%(286 flights)
  • 6–9 PM—(9 flights)
  • 9 PM–12 AM88%(33 flights)
On-time trend by month
100%
May

Jun 79% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202579%29
July 202586%29
August 202581%31
September 202577%30
October 202572%29
November 202567%27
December 202558%31
January 202686%22
February 202684%19
March 202684%25
April 2026100%26
May 2026100%30
Departures on time
81%
Diverted
0.3%
Flights flown
328
Months covered
12

Keep nerding

Based on 333 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.