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Flight Reliability

DL 977 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 977 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

72%
Arrive within 15 minutes
11 min
Average arrival delay
2.3%
Cancelled
3 min early
Median arrival delay

Based on 444 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon70%(66 flights)
  • Tue77%(66 flights)
  • Wed74%(66 flights)
  • Thu71%(65 flights)
  • Fri68%(68 flights)
  • Sat71%(48 flights)
  • Sun76%(55 flights)
On-time by departure window
  • 6–9 AM83%(144 flights)
  • 9 AM–12 PM100%(10 flights)
  • 12–3 PM66%(151 flights)
  • 6–9 PM65%(129 flights)
On-time trend by month
76%
May

Jun 84% → May 76% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202584%19
July 202591%11
August 202564%25
September 202577%30
October 202548%31
November 202572%29
December 202563%35
January 202673%44
February 202680%40
March 202682%54
April 202667%54
May 202676%62
Departures on time
74%
Diverted
0%
Flights flown
434
Months covered
12

Keep nerding

Based on 444 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.